ECU fault codes and troubleshooting for Lada Largus

Troubleshooting Codes Table

Code - Description

DF001 Coolant Temperature Sensor Circuit

DF002 Air Temperature Sensor Circuit
DF022 OBD Warning Light Circuit
DF023 Coolant Temperature Warning Light Circuit
DF038 ECU
DF040 Cylinder 1 Injector Circuit
DF041 Cylinder 2 Injector Circuit
DF042 Cylinder 3 Injector Circuit
DF043 Cylinder #4
DF081 Canister Purge Solenoid Valve Circuit
DF082 Upstream HO2S Heater Circuit
DF083 Downstream HO2S Heater Circuit
DF084 Actuator Relay Control Circuit
DF091 Vehicle Speed Information
DF092 Upstream HO2S Circuit
DF093 Downstream HO2S Circuit
DF123 Emission Misfire
DF124 Catalytic Converter Misfire
DF232 Coolant Pressure Sensor Circuit
DF328 Sensor Circuit throttle position
DF330 Knock sensor circuit
DF336 Engine speed and position sensor circuit
DF352 Engine immobilizer circuit
DF353 Absolute pressure sensor circuit
DF360 Idle speed control circuit
DF361 Ignition coil circuit for cylinders 1 and 4
DF362 Ignition coil circuit for cylinders 2 and 3
DF378 ABS ECU communication with injection ECU
DF390 Oxygen sensor malfunction
DF394 Catalytic converter malfunction catalytic converter
DF514 Fuel pump relay circuit
DF524 Output voltage of actuator relay
DF587 +5 V supply voltage of sensors

Fault code, malfunction decoding and troubleshooting methods

DF001 - Coolant temperature sensor circuit

- 1 Open circuit or short circuit

Diagnostic instructions

Priority for processing faults:

- First, process fault DF587 "+5 V supply voltage of sensors", if it is current or stored.

Conditions for performing diagnostics for a stored fault:

- The fault is defined as current after the coolant temperature value changes more than the set value limit.

After the condition is met, the fault should be determined as current, but may be determined again as stored.

Features:

If a current fault is detected, use the following procedure to check the coolant temperature sensor circuit.

Check the connection reliability and condition of the coolant temperature sensor connector. If necessary, repair the fault.

Make sure that the resistance of the coolant temperature sensor is not zero or infinite (i.e. there is no obvious fault).

Compare the resistance values of the sensor with the values given in the "Additional information" section.

Check that the resistance of the sensor changes depending on the temperature.

If necessary, replace the coolant temperature sensor.

Using the universal contact plate, check for open and short circuits in the circuits:

- ECU ECM, terminal "13" - terminal "B1" of the coolant temperature sensor;
- ECU ECM, terminal "73" - terminal "B2" of the coolant temperature sensor.

If necessary, repair the fault.

If the fault persists, process other faults, and then perform the check compliance.

After troubleshooting, perform: diagnostic instructions to confirm repair; process other faults detected by the diagnostic tool, and then delete fault information from the ECU memory; perform conformity check.

DF002 - Air temperature sensor circuit

- Open circuit or short circuit

Diagnostic instructions

Fault handling priority:

- Handle fault DF587 "Supply voltage +5 V sensors" first if it is current or stored.

Conditions for running diagnostics on a stored fault:

The fault is defined as current after the air temperature value changes above the set limit.

After the condition is met, the fault should be defined as current, but may re-define as stored.

Special features:

If a current fault is detected, use the following procedure to check the temperature sensor circuit air temperature sensor.

Check the connection reliability and condition of the air temperature sensor connector.

If necessary, repair the fault.

Make sure that the resistance of the air temperature sensor is not zero or infinite (i.e. there is no obvious fault).

Compare the resistance values of the sensor with the values given in the "Additional information" section.

Check that the resistance of the sensor changes depending on the temperature.

If necessary, replace the air temperature sensor.

Using the universal contact plate, check for open and short circuits in the circuits:

ECU ECM, contact "49" - contact "1" of the air temperature sensor;
ECU ECM, contact "77" - contact "2" of the air temperature sensor.

If necessary, repair the fault.

If the fault persists, process other faults, and then perform a conformity check.

After the fault has been corrected, perform: diagnostic instructions to confirm the repair; process other faults detected by the diagnostic tool, and then clear the fault information from the ECU memory; perform conformity check.

DF022 - On-Board Diagnostic (OBD) warning light circuit

Circuit open or short-circuited
Open circuit
Short to ground
Short to +12 V

Diagnostic instructions

Conditions for running diagnostics for a stored fault:

The fault is defined as current after the AC047 command is issued

"OBD warning light".

Special features:

- 2/3/4 in current faults.

for any stored fault.

Using the universal contact plate, check no open or short circuit in the circuit:

- ECU ECM, contact "34" - instrument cluster.

If necessary, eliminate the fault.

Check for "+" 12 V on the contact of the on-board diagnostics signal lamp.

Check the condition of the instrument cluster power supply circuit fuses.

If necessary, eliminate the fault.

If the fault persists, perform instrument cluster diagnostics.

After eliminating the fault, perform: diagnostic instructions to confirm the repair; process other faults detected by the diagnostic tool, then delete the fault information from the ECU memory; perform conformity check.

DF023 - Coolant temperature warning lamp circuit

Circuit open or shorted
Open circuit
Short to ground
Short to +12 V

Diagnostic hints

Conditions for running diagnostics for a stored fault:

The fault is defined as current after the AC116 command is issued

"Coolant temperature warning lamp".

Special features:

- 2/3/4 in current faults.
- 1 for any stored fault.

Using universal contact plate, check for open circuit and short circuit in the circuit:

- ECU ECM, contact "9" - instrument cluster.

If necessary, eliminate the fault.

Check for "+" 12 V on the contact of the coolant temperature warning lamp.

Check the condition of the instrument cluster power supply circuit fuses.

If necessary, eliminate the fault.

If the fault persists, perform instrument cluster diagnostics.

DF038 - ECU

Diagnostic instructions - None

The ECU is faulty or the software does not match the vehicle.

Make sure that the ECU configuration matches the equipment installed in the vehicle.

If it does not match, reprogram the ECU.

If the fault persists, replace the ECU.

Once the fault has been corrected, perform: a road test, then a repeat check using the diagnostic tool; process any other faults detected by the diagnostic tool, then clear the fault information from the ECU memory; perform conformity check.

DF040 - Cylinder 1 injector circuit

Circuit open or shorted
Open circuit
Short to ground
Short to +12V

Diagnostic hints

Fault handling priority:

First DF084 "Actuator relay control circuit" fault should be processed if it is current or stored.

Conditions for running diagnostics for a stored fault:

The fault is defined as current after the engine has been started.

Start the engine and stop it immediately after the fault becomes current to avoid damaging the catalytic converter.

Special features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is detected, use the following procedure to check the injector circuit of cylinder #1.

Check the connection and condition of the injector #1 connector. Repair if necessary.

Measure and compare the resistance value injectors with the value given in the "Additional information" section.

Replace the injector if necessary.

With the ignition on, check for 12 V at terminal "1" of the harness connector to the injector of cylinder #1. If necessary, troubleshoot the circuit up to the actuator relay.

Using the universal contact plate, check for open and short circuits in the circuit:

- ECU ECM, terminal "59" - terminal "2" of the injector of cylinder #1.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformity check.

After troubleshooting, perform: diagnostic instructions to confirm repair; process other faults detected by the diagnostic tool, then clear the fault information from the ECU memory; perform conformity check.

DF041 - Cylinder 2 injector circuit

Circuit open or shorted
Open circuit
Short to ground
Short to +12 V

Diagnostic hints

Fault handling priority:

First handle fault DF084 "Actuator relay control circuit" if it is current or stored.

Conditions for running diagnostics on a stored fault:

The fault is declared current after the engine has started.

Start the engine and stop it immediately after the fault becomes current to avoid damaging the catalytic converter. neutralizer.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is detected, use the following procedure to check the cylinder 2 injector circuit.

Check the connection reliability and condition of the injector 2 connector. If necessary, repair the fault.

Measure and compare the injector resistance value with the value given in the "Additional information" section.

Replace the injector if necessary.

With the ignition on, check for 12 V at contact "1" of the harness connector to the cylinder 2 injector. If necessary, repair the fault in the circuit up to the actuator relay.

Using a universal contact board, check for open circuits and short circuits in the circuit:

- ECU ECM, contact "90" - contact "2" of the injector of cylinder No. 2.

If necessary, eliminate the fault.

If the fault persists, process other faults, and then perform a conformity check.

After eliminating the fault, perform: diagnostic instructions to confirm the repair; process other faults detected by the diagnostic tool, and then delete the fault information from the ECU memory; perform conformity check.

DF042 - Cylinder 3 injector circuit

Circuit open or shorted
Open circuit
Short to ground
Short to +12 V

Diagnostic hints

Fault handling priority:

First handle fault DF084 "Actuator relay control circuit" if it is current or stored.

Conditions for running diagnostics on a stored fault:

The fault is declared current after the engine has started.

Start the engine and stop it immediately after the fault becomes current to avoid damaging the catalytic converter. neutralizer.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is detected, use the following procedure to check the injector circuit of cylinder #3.

Check the connection reliability and condition of the injector #3 connector. Repair if necessary.

Measure and compare the resistance value of the injector with value given in the "Additional information" section.

Replace the injector if necessary.

With the ignition on, check for 12 V at terminal "1" of the harness connector to the injector of cylinder #3. If necessary, troubleshoot the circuit up to the actuator relay.

Using the universal contact plate, check for open and short circuits in the circuit:

- ECU ECM, terminal "60" - terminal "2" of the injector of cylinder #3.

Troubleshoot if necessary.

If the fault persists, process other faults, then perform a conformity check.

DF043 - Cylinder 4 injector circuit

Circuit open or shorted
Open circuit
Short to ground
Short to +12 V

Diagnostic hints

Fault handling priority:

First handle fault DF084 "Actuator relay control circuit" if it is current or stored.

Conditions for running diagnostics on a stored fault:

The fault is declared current after the engine has started.

Start the engine and stop it immediately after the fault becomes current to avoid damaging the catalytic converter. neutralizer.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is detected, use the following procedure to check the injector circuit of cylinder #4.

Check the connection reliability and condition of the injector #4 connector. If necessary, repair the fault.

Measure and compare the injector resistance value with the value given in the "Additional information" section.

Replace the injector if necessary.

With the ignition on, check for 12 V at contact "1" of the harness connector to the injector of cylinder #4. If necessary, repair the fault in the circuit up to the actuator relay.

Using a universal contact board, check for open circuits and short circuits in the circuit:

- ECU ECM, contact "89" - contact "2" of the injector of cylinder No. 4.

If necessary, eliminate the fault.

If the fault persists, process other faults, and then perform a conformity check.

DF081 - Canister purge solenoid valve circuit

Circuit open or short circuit
Open circuit
Short circuit to ground
Short circuit to +12 V

Diagnostic hints

Fault handling priority:

First handle fault DF084 "Actuator relay control circuit" if it is current or stored.

Conditions for running diagnostics on stored fault:

The fault is declared current after AC017 command is issued

"Canister purge solenoid valve "canister".

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is detected, use the following procedure to check the canister purge solenoid valve circuit.

Check the connection reliability and condition of the canister purge solenoid valve connector. Repair if necessary.

Measure and compare the resistance value of the canister purge solenoid valve with the value given in the "Additional information" section.

Replace the canister purge solenoid valve if necessary.

With the ignition on, check for 12 V at contact "1" of the harness connector to the canister purge valve. If necessary, troubleshoot the circuit up to the actuator relay.

Using the universal contact plate, check for open and short circuits in the circuit:

- ECU ECM, contact "4" - contact "2" of the purge solenoid valve of the adsorber.

If necessary, troubleshoot the fault.

If the fault persists, process other faults, then perform a conformity check.

After troubleshooting, perform: diagnostic instructions to confirm repair; process other faults ...If the fault persists, perform a conformity check;

After troubleshooting, perform: diagnostic instructions to confirm repair;

After troubleshooting, perform: errors detected by the diagnostic device, and then delete the information about the faults from the ECU memory; perform conformity check.

DF082 - Upstream oxygen sensor heater circuit

Circuit open or shorted
Fault in heater element power supply circuit
Open circuit
Short to ground
Short to +12 V

Diagnostic hints

Fault handling priority:

First handle fault DF084 "Actuator relay control circuit" if it is current or stored.

Conditions for running diagnostics on stored fault

The fault is declared current after AC018 command is issued

"Upstream oxygen sensor heater" or after starting the engine.

Features:

- 3/4/5 in current faults.
- 1/2 for any stored fault.

If a current fault is detected, use the following procedure to check the upstream oxygen sensor heater circuit.

Check the connection and condition of the oxygen sensor connector. Repair if necessary.

Measure and compare the resistance value of the upstream oxygen sensor heater element with the value given in the "Additional information" section.

Replace the sensor if necessary.

With the ignition on, check for 12 V at terminal "4" of the harness connector to the upstream oxygen sensor. If necessary, troubleshoot the circuit up to the actuator relay.

Using a universal contact plate, check for open and short circuits in the circuit:

- ECU ECM, contact "63" - contact "3" of the upper oxygen sensor.

If necessary, troubleshoot the fault.

If the fault persists, process other faults, then perform a conformity check.

After troubleshooting, perform: diagnostic instructions to confirm repair; process other faults detected by the diagnostic tool, then delete the fault information from the ECU memory; perform conformity check

DF083 - Downstream oxygen sensor heater circuit

Circuit open or shorted
Fault in heater element power supply circuit
Open circuit
Short to ground
Short to +12 V

Diagnostic hints

Conditions for running diagnostics on stored fault:

The fault is defined as current after AC019 command

"Downstream oxygen sensor heater" or after a certain time of engine operation under load (road test).

Special features:

- 3/4/5 in current faults.
- 1/2 for any fault stored.

If a current fault is detected, use the following procedure to check the downstream HO2S heater circuit.

Check the connection and condition of the HO2S connector. Repair if necessary.

Measure and compare the resistance value of the downstream HO2S heater element to the value listed in the Additional Information section.

Replace the sensor if necessary.

With the ignition on, check for 12 V at terminal "4" of the downstream HO2S harness connector. If necessary, troubleshoot the circuit up to the actuator relay.

Using a universal contact plate, check for open and short circuits in the circuit:

- ECU ECM, contact "65" - contact "3" of the lower oxygen sensor.

If necessary, troubleshoot the fault.

If the fault persists, process other faults, then perform a conformity check.

DF084 - Actuator relay control circuit

Circuit open or short circuit
Open circuit
Short circuit to ground
Short circuit to +12 V

Diagnostic instructions

Conditions for performing diagnostics for a stored fault:

The fault is defined as current after the ignition is turned on.

If there are several faults, first process this fault.

Special features:

- 2/3/4 in current faults.
- 1 for any stored fault.

Check the reliability of the system harness connection ignition with "mass" of the car i.

If necessary, repair the fault.

Check the reliability of the connection and the condition of the socket to the actuator relay. If necessary, repair the fault.

Check for 12 V at contact "A1" of the actuator relay.

If necessary, repair the fault in the circuit before the fuse.

Check the actuator relay winding for an open circuit.

If necessary, replace the relay.

Using the universal contact plate, check for an open circuit and short circuit in the circuit:

- ECU ECM, contact "39" - contact "A2" of the actuator relay.

If necessary, repair the fault.

If the fault persists, process other faults, and then perform a conformity check.

After repairing the fault, perform: diagnostic instructions to confirm repair; process other faults detected by the diagnostic device, and then delete the fault information from the ECU memory; perform a conformity check.

DF091 - Vehicle speed information

Diagnostic instructions

Conditions for performing diagnostics on a stored fault:

The fault is declared current after a road test.

Carry out a road test on an uphill slope at a constant speed.

Carry out a road test on a slope without depressing the accelerator pedal.

Special features:

If a current fault is detected, use the following procedure to check the vehicle speed sensor circuit.

If the injection ECU does not receive vehicle speed information, check for possible damage to the ignition wiring harness.

Check the connection and condition of the speed sensor connector.

Treat as necessary.

If the fault persists, disconnect the wiring harness connector from the vehicle speed sensor.

With the ignition on, check for +12 V at contact "2" of the connector to the sensor and for ground at contact "1" of the connector to the sensor.

If there is no +12 V at contact "2" of the connector to the sensor, check the condition of the circuit to the actuator relay.

If necessary, troubleshoot the circuit to the actuator relay

Using the universal contact board, check for open circuits and short circuits in the circuits:

- actuator relay, contact "A5" - contact "2" of the vehicle speed sensor;

- "ground" - contact "1" of the vehicle speed sensor;
- ECU ECM, contact "53" - contact "3" of the vehicle speed sensor.

If necessary, troubleshoot faults.

If the fault persists, replace the vehicle speed sensor.

After the fault has been corrected, perform: diagnostic instructions to confirm the repair; process other faults detected by the diagnostic tool, and then delete the fault information from the ECU memory; perform a conformity check.

DF092 - Upstream oxygen sensor circuit

Open circuit or short circuit

Diagnostic instructions

Fault handling priority:

First handle fault DF587 "+5 V sensor supply voltage" if it is current or stored.

Conditions for running diagnostics for a stored fault

The fault is defined as current after the engine has started.

At idle, check that the ET052 "Upstream oxygen sensor heating" status is "ON", wait until

ET300 "Fuel mixture control" status is "ON", then wait 5 minutes.

Features:

If a current fault is detected, use the following procedure to check the upstream oxygen sensor circuit.

Check the connection and condition of the upstream oxygen sensor connector.

Check for moisture in the connector (possible cause of "dips" during acceleration).

Repair if necessary.

Check for air leaks between the exhaust manifold and the catalytic converter.

Using a universal contact plate, check for open and short circuits in the circuits:

- ECU ECM, contact "45" - contact "2" of the upstream oxygen sensor;
- ECU ECM, contact "80" - contact "1" of the upstream oxygen sensor.

Repair if necessary. fault.

If the fault persists, replace the oxygen sensor.

If the fault persists, deal with the other faults and then perform a conformity check.

After rectifying the fault, perform: diagnostic prompts to confirm repair; deal with the other faults; faults detected by the diagnostic device, and then delete the fault information from the ECU memory; perform conformity check

DF093 - Downstream oxygen sensor circuit

Open or short circuit

Diagnostic instructions

Fault handling priority:

First handle fault DF587 "+5 V sensor supply voltage" if it is current or stored.

Conditions for running diagnostics for a stored fault

The fault is declared current after:

- a road test at constant speed, after switching on the electric cooling fan and activating the ET056 "Dual feedback oxygen content control of the fuel-air mixture in the exhaust gases" state (characteristic "YES");
- a road test at constant speed, after switching on the electric cooling fan and subsequent engine braking (with a gear engaged and the clutch pedal released), and activation of the ET278 "Throttle position: idle" status (characteristic "YES").

Features:

If a current fault is detected, use the following procedure to check the downstream oxygen sensor circuit.

Check the reliability of the connection and the condition of the downstream oxygen sensor connector.

Repair the fault if necessary.

Check for air leaks in the area between the two oxygen sensors.

Using a universal contact plate, check for open and short circuits in the circuits:

- ECU ECM, contact "44" - contact "2" of the upstream oxygen sensor;
- ECU ECM, contact "76" - contact "1" of the upstream oxygen sensor sensor.

If necessary, repair the fault.

If the fault persists, replace the oxygen sensor.

If the fault persists, deal with other faults, then perform a conformity check.

After repairing the fault, perform: diagnostic instructions to confirm repair; deal with other faults detected by the diagnostic tool, then clear the fault information from the ECU memory; perform conformity check.

DF123 - Emissions misfire

Diagnostic instructions

Conditions for running diagnostics for stored and current fault:

The fault is declared current after the engine has started.

The ET061 "Detect cylinder 1 Roughness adaptation" status must be enabled (have the "YES" characteristic) to detect misfires in a specific cylinder. The following conditions provide information on the nature and location of the fault:

- ET057 "Misfire in cylinder 1";
- ET058 "Misfire in cylinder 2";
- ET059 "Misfire in cylinder 3";
- ET060 "Misfire in cylinder 4".

If misfires are detected only in one cylinder (the ET057, or ET058, or ET059, or ET060 condition is active), then the fault is associated with the element that is involved in the ignition process of this cylinder only:

- faulty injector, or spark plug, or high-voltage wire, or finger-type ignition coil (for the K4M engine). Before replacing the element, you can check it by moving it to another cylinder.

If misfires are detected in a pair of cylinders No. 1 and No. 4, or No. 2 and No. 3 (the ET057 and ET060, or ET058 and ET059 states are active, respectively), then the fault is associated with an element that participates in the mixture ignition process in the corresponding cylinders:

- a fault in the high-voltage circuit of one of the coils of the four-terminal ignition coil or the ignition coil control circuit.

If misfires are detected in all four cylinders (the ET057, ET058, ET059, ET060 states are active), then the fault is associated with the following:

- a fault in the fuel pump, fuel filter, non-compliance with the required gasoline grade, non-compliance with the spark plug type ignition.

Check the ignition system.

If necessary, correct the fault.

Check the compression in the engine cylinders.

If necessary, correct the fault.

Check the fastening of the engine crankshaft position and speed sensor, the gap between the sensor and the flywheel ring gear.

If necessary, correct the fault.

If the fault persists, check: fuel filter, fuel supply and pressure, condition of the fuel pump, cleanliness of the fuel tank, condition of the injectors. Correct the fault in the fuel supply system.

After correcting the fault, to perform: process other faults detected by the diagnostic tool, then clear the fault information from the ECU memory; to confirm the repair, perform the necessary programming and the "Misfire detection diagnostic" test for misfires.

DF124 - Misfires leading to failure of the catalytic converter

Diagnostic instructions

Conditions for performing diagnostics for a stored and current fault:

The fault is declared current after the engine has been started.

The ET061 "Recognition of cylinder 1 Irregularity adaptation" status must be activated (have the "YES" characteristic) in order to detect misfires in a specific cylinder. The following conditions provide information on the nature and location of the fault:

- ET057 "Misfire in cylinder 1";
- ET058 "Misfire in cylinder 2";
- ET059 "Misfire in cylinder 3";
- ET060 "Misfire in cylinder 4".

- faulty injector, or spark plug, or high-voltage wire, or finger-type ignition coil (for the K4M engine). Before replacing the element, you can check it by moving it to another cylinder.

- a fault in the high-voltage circuit of one of the coils of the four-terminal ignition coil or the ignition coil control circuit.

If misfires are detected in all four cylinders (the ET057, ET058, ET059, ET060 states are active), then the fault is associated with the following:

- a fault in the fuel pump, fuel filter, non-compliance with the required gasoline grade, non-compliance with the spark plug type ignition.

Check the ignition system.

If necessary, eliminate the fault.

Check the compression in the engine cylinders.

If necessary, eliminate the fault.

Check the fastening of the engine crankshaft position and speed sensor, the gap between the sensor and the flywheel ring gear.

If necessary, eliminate the fault.

If the fault persists, check: fuel filter, fuel supply and pressure, condition of the fuel pump, cleanliness of the fuel tank, condition of the injectors. Eliminate faults in the fuel supply system.

After eliminating the fault, do the following: process other faults detected by the diagnostic tool, then delete the fault information from the ECU memory; to confirm repair, perform the necessary programming and diagnostic test for misfires in accordance with the section "Misfire Detection Diagnostics".

DF232 - Refrigerant Pressure Sensor Circuit

Diagnostic Aids

Special Features:

On vehicles equipped with a refrigerant pressure sensor (information about the operation of the air conditioning system is received by the ECM), the ECU recalculates the parameter PR125 "Power consumed by the air conditioning compressor" based on the refrigerant pressure values. If the PR037 "Refrigerant Pressure" parameter deviates from the norm, the value of the PR125 parameter may be incorrect.

Check the reliability of the connection and the condition of the refrigerant pressure sensor connector.

If necessary, eliminate the fault.

Using the universal contact plate, check for open circuits and short circuits in the circuits:

- ECU ECM, contact "18" - contact "C" of the refrigerant pressure sensor;
- ECU ECM, contact "82" - contact "A" of the refrigerant pressure sensor;
- ECU ECM, contact "83" - contact "B" of the refrigerant pressure sensor.

If necessary, eliminate the fault.

If the fault persists, replace the refrigerant pressure sensor.

After elimination faults, perform: diagnostic prompts to confirm repair; handle other faults detected by the diagnostic tool and then clear the fault information from the ECU memory; perform a conformity check.

DF328 - Throttle position sensor circuit

Open or short circuit

Diagnostic prompts

Fault handling priority:

First handle fault DF587 "Supply voltage +5 V sensors" if it is the current or stored.

Conditions for performing diagnostics for a stored malfunction:

The malfunction is determined as current after:

- turn on the ignition, do not press the accelerator pedal for 10 seconds;
- smoothly depress the accelerator pedal all the way, moving the throttle position sensor from the "idle" position to the "full load" position, and hold the pedal in this state for 10 seconds.

After meeting the condition, the malfunction should be determined as current, but may again be determined as stored.

Features:

If a current malfunction is detected, use the following method to check the throttle position sensor circuit.

Check the reliability of the connection and the condition of the throttle position sensor connector. If necessary, repair the fault.

Make sure that the resistance of the throttle position sensor is not zero or infinite (i.e. there is no obvious fault).

Compare the resistance values of the sensor

Check that the resistance of the sensor changes smoothly when moving the throttle valve from the idle position to the full load position.

Replace the throttle position sensor if necessary.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU ECM, contact "43" - contact "C" of the throttle position sensor;
- ECU ECM, contact "74" - contact "B" of the throttle position sensor;
- ECU ECM, contact "75" - contact "A" throttle position sensor.

If necessary, repair the fault.

If the fault persists, refer to the interpretation of fault DF587 "Supply voltage +5 V sensors".

After repairing the fault, perform: diagnostic instructions to confirm the repair; process other faults detected by the diagnostic tool, then clear the fault information from the ECU memory; perform conformity check.

DF330 - Knock sensor circuit

- 1 Open or short circuit

Diagnostic instructions

Conditions for performing diagnostics for a stored fault:

The fault is defined as current after a road test with the engine warmed up to operating temperature under load conditions.

Special features:

If a current fault is detected, use the following procedure to check the knock sensor circuit.

Check the connection and condition of the knock sensor connector.

Rectify the fault if necessary.

Check the tightening torque of the knock sensor on the cylinder block.

Rectify the fault if necessary.

Using the universal contact plate, check for open and short circuits in circuits:

- ECU ECM, terminal "19" - knock sensor screen;
- ECU ECM, terminal "20" - knock sensor terminal "1";
- ECU ECM, terminal "79" - knock sensor terminal "2".

If necessary, repair the fault.

If the fault persists, process other faults, then perform a conformity check.

After repairing the fault, perform: diagnostic instructions to confirm repair; process other faults detected by the diagnostic tool, then clear the fault information from the ECU memory; perform conformity check.

DF336 - Engine Crankshaft Position and Speed Sensor Circuit

- 1 Malfunction of the sensor marker section on the flywheel ring gear
- 2 No signal from the sensor

Diagnostic instructions

Fault handling priority:

First handle fault DF353 "Absolute pressure sensor circuit" if it is current or stored.

Conditions for running diagnostics for a stored fault:

The fault is defined as current after the starter is engaged for 10 seconds or the engine is running.

Special features:

If a current fault is detected, use the following procedure to check the crankshaft position and speed sensor circuit engine.

Check the reliability of the connection and the condition of the engine position and speed sensor connector. If necessary, eliminate the malfunction.

Check the reliability of the fastening of the engine position and speed sensor. If necessary, eliminate the malfunction.

Compare the resistance value of the sensor. If necessary, replace the sensor.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU ECM, contact "24" - contact "B" of the position and speed sensor engine crankshaft rotation;
- ECU ECM, terminal "54" - terminal "A" of the engine position and speed sensor.

If necessary, eliminate the fault.

Check the condition of the flywheel ring gear marker section.

If the fault persists, process other faults, and then perform a conformity check.

After eliminating the fault, perform the following: check that the ET422 "Misfire diagnostic results taken into account" status has the "Yes" characteristic, otherwise perform programming in accordance with paragraph "Conditions for performing diagnostics by the on-board diagnostics system"; process other faults detected by the diagnostic tool, and then delete the fault information from the ECU memory; perform conformity check.

DF352 - Electronic engine immobilizer circuit

- 1 Open circuit or short circuit

Diagnostic instructions

Conditions for performing diagnostics for a stored fault

A fault is defined as current if it is detected when the ignition is turned on.

Check the connection and condition of pin "58" of the ECM connector.

Rectify the fault if necessary.

Using the universal contact plate, check for open circuits and short circuits in the circuit:

- ECM, pin "58" - pin "36" of the UCH.

Rectify the fault if necessary.

If the fault persists, perform diagnostics of the immobilizer system engine.

After troubleshooting, perform: diagnostic instructions to confirm repair; process other faults detected by the diagnostic tool, then delete fault information from the ECU memory; perform conformity check.

DF353 - Absolute pressure sensor circuit

- 1 Open or short circuit
- 2 Manifold pressure change

Diagnostic hints

Fault handling priority:

First handle fault DF587 "Supply voltage +5 V sensors" if it is current or stored.

Conditions for running diagnostics for a stored fault:

The fault is defined as current after the engine has been running and the engine speed has exceeded 608 rpm for at least 10 seconds.

Special features:

If a current fault is detected, use the following procedure to check the absolute pressure sensor circuit.

If the fault is defined as current only when the engine is running, check with the ignition on that parameter PR429 corresponds to the throttle position "idle" and "full load".

Smoothly press the accelerator pedal (from the "idle" position) until it stops and make sure that the throttle opening angle increases as the pedal moves.

If the parameters do not correspond to the norm, see the interpretation of parameter PR429 "Measured throttle position".

Check the reliability of the connection and the condition of the absolute pressure sensor connector.

If necessary, eliminate the malfunction.

Check the tightness of the sensor mount on the intake manifold.

Using the universal contact board, check for open and short circuits in the circuits:

- ECU ECM, contact "15" - contact "A" of the absolute pressure sensor;
- ECU ECM, terminal "16" - terminal "B" of the absolute pressure sensor;
- ECU ECM, terminal "78" - terminal "C" of the absolute pressure sensor.

If necessary, repair the fault.

If the fault persists, refer to the interpretation of fault DF587 "Supply voltage +5 V sensors".

DF360 - Idle Speed Control Circuit

- 1 Open or Shorted Circuit
- 2 Open Circuit
- 3 Short to Ground
- 4 Short to +12V

Diagnostic Guidelines

Conditions for Running Diagnostics on Stored Fault:

The fault is defined as current after the engine is started.

Special Features:

- 2/3/4 in Current Faults.
- 1 for any stored fault.

If a current fault is detected, use the following procedure to check the control circuit idle speed.

Check the reliability of the connection and the condition of the idle speed control connector.

If necessary, correct the malfunction.

Measure and compare thread the resistance value of the idle speed control stepper motor with the value given in the "Additional information" section.

If necessary, replace the idle speed control.

Using the universal contact plate, check for open and short circuits in the circuit:

- ECU ECM, terminal "12" - terminal "B" of the idle speed control;
- ECU ECM, terminal "41" - terminal "A" of the idle speed control;
- ECU ECM, terminal "42" - terminal "C" of the idle speed control;
- ECU ECM, terminal "72" - terminal "D" of the idle speed control.

If necessary, eliminate the fault.

If the fault persists, handle other faults, then perform a conformity check.

After the fault has been corrected, perform: diagnostic instructions to confirm the repair; handle other faults detected by the diagnostic tool, then clear the fault information from the ECU memory; perform conformity check.

DF361 - Ignition coil circuit cylinders #1 and #4

- 1 Circuit open or shorted
- 2 Circuit open
- 3 Short to ground
- 4 Short to +12 V

Diagnostic hints

Fault handling priority

First handle faults DF587 "+5 V sensor supply voltage" and DF514 "Fuel pump relay circuit" if they are current or stored.

Conditions for running diagnostics on a stored fault:

The fault is defined as current after starting engine.

Start the engine and stop it immediately after the fault becomes current, so as not to cause destruction of the catalytic converter, or turn on the starter for 10 seconds.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is detected, use the following method to check the ignition coil circuit of cylinders No. 1-4.

Check the reliability of the connection and the condition of the connector of the four-pin ignition coil (for the K7M engine), individual ignition coils of cylinders No. 1 and No. 4 (for the K4M engine). If necessary, eliminate the malfunction.

Measure and compare the resistance values of the primary and secondary windings of the four-terminal ignition coil (for the K7M engine), individual ignition coils of cylinders No. 1 and No. 4 (for the K4M engine) with the values given at the end of the article "Additional information". If necessary, replace the ignition coil.

With the ignition on, check for 12 V at contact "C" of the harness connector to the four-pin ignition coil (for the K7M engine), at contact "1" of the harness connector to the individual ignition coil of cylinder No. 1 (for the K4M engine).

If necessary, troubleshoot the circuit up to contact "B5" of the fuel pump relay, see the interpretation of fault DF514 "Fuel pump relay circuit".

Using the universal contact board, check for open and short circuits in the circuit:

- for the K7M engine - ECU ECM, contact "32" - contact "A" of the ignition coil;
- for the K4M engine - ECU ECM, contact "32" - contact "2" of the ignition coil of cylinder No. 4, and terminal "1" of ignition coil No. 4 - terminal "2" of ignition coil No. 1.

If necessary, repair the fault.

If the fault persists, replace the ignition coil in question.

If the fault persists, deal with other faults, then perform a conformity check.

DF362 - Ignition coil circuit cylinders 2 and 3

- 1 Circuit open or shorted
- 2 Circuit open
- 3 Short to ground
- 4 Short to +12 V

Diagnostic hints

Fault handling priority

First handle faults DF587 "+5 V sensor supply voltage" and DF514 "Fuel pump relay circuit" if they are current or stored.

Conditions for running diagnostics on a stored fault:

The fault is defined as current after starting engine.

Start the engine and stop it immediately after the fault becomes current, so as not to cause destruction of the catalytic converter, or operate the starter for 10 seconds.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

When a current fault is detected, the engine will be stopped use the method below to check the ignition coil circuit of cylinders #2-3.

Check the reliability of the connection and the condition of the connector of the four-pin ignition coil (for the K7M engine), individual ignition coils of cylinders #2 and #3 (for the K4M engine). If necessary, eliminate the malfunction.

Measure and compare the resistance values of the primary and secondary windings of the four-pin ignition coil (for the K7M engine), individual ignition coils of cylinders #2 and #3 (for the K4M engine) with the values given at the end of the article "Additional information". If necessary, replace the ignition coil.

If necessary, troubleshoot the circuit up to contact "B5" of the fuel pump relay, see the interpretation of fault DF514 "Fuel pump relay circuit".

Using the universal contact board, check for open and short circuits in the circuit:

- for the K7M engine - ECU ECM, contact "1" - contact "B" of the ignition coil;
- for the K4M engine - ECU ECM, contact "1" - contact "2" of the ignition coil cylinder

No. 3, and terminal "1" of ignition coil No. 3 - terminal "2" of ignition coil No. 2.

If necessary, repair the fault.

If the fault persists, replace the relevant ignition coil.

If the fault persists, deal with other faults, then perform a conformity check.

DF378 - ABS ECU to injection ECU communication

Check the connection and condition of the ABS ECU connector.

If necessary, repair the fault.

Check the connection and condition of the ECM ECU connector.

If necessary, repair the fault.

If the fault persists, run diagnostics of the multiplex network.

If the fault persists, run diagnostics of the ABS ECU.

After repairing the fault, do the following: process other faults detected by the diagnostic tool, then delete the fault information from the ECU memory; perform conformity check.

DF390 - Oxygen sensor malfunction

Diagnostic instructions

Conditions for diagnostics for stored and current faults:

- The fault is defined as current after the engine is started.

Features:

This fault indicates a discrepancy between the signal from the upstream oxygen sensor and the actual value.

Check the exhaust system for leaks.

Rectify the fault if necessary.

Check the connection reliability and condition of the upstream oxygen sensor connector.

Rectify the fault if necessary.

Using the universal contact plate, check for open and short circuits in the circuits:

- ECU ECM, contact "45" - contact "2" upstream oxygen sensor;
- ECM, terminal "63" - terminal "3" of the upstream oxygen sensor;
- ECM, terminal "80" - terminal "1" of the upstream oxygen sensor.

If necessary, repair the fault.

If the fault persists, replace the oxygen sensor.

If the fault persists, treat the other faults, then perform a conformity check.

After repairing the fault, perform: diagnostic prompts to confirm repair; treat other faults detected by the diagnostic tool, then clear the fault information from the ECM memory; perform conformity check.

DF394 - Catalytic converter malfunction

Diagnostic instructions

Conditions for diagnostics for stored and current faults:

The fault is defined as current after the engine is started.

Features:

This fault indicates a mismatch between the signals from the upper and lower oxygen sensors.

Check the exhaust system for leaks.

Repair if necessary.

Inspect the catalytic converter. The presence of deformations in the housing may be the cause of its malfunction.

Visually inspect for signs of severe overheating. (Cold water on a hot catalytic converter can cause its destruction).

Check, not noted excessive oil or coolant consumption. Ask the owner if he has used additives or other similar products. Such products can clog the catalytic converter, which can later cause its failure.

Check with the diagnostic tool for misfires.

If the fault needs to be repaired, refer to the interpretation of fault DF124.

If the fault persists, deal with other faults and then perform a conformity check.

Once the fault has been repaired, perform: diagnostic prompts to confirm repair; deal with other faults detected by the diagnostic tool and then clear the fault information from the ECU memory; perform conformity check.

DF514 - Fuel pump relay circuit

- 1 Fuel pump relay power supply circuit fault
- 2 Fuel pump relay control circuit fault

Diagnostic hints

Fault handling priority:

First handle fault DF587 "+5 V sensor supply voltage" if it is current or stored.

Conditions for running diagnostics on stored fault:

The fault is defined as current after the AC015 "Fuel pump relay" command is issued.

This fault is a priority fault.

Special features:

If a current fault is detected, use the following procedure to check the relay circuit fuel pump.

- 1 Fuel pump relay power supply circuit fault:

Check the connection reliability and the condition of the connector to the fuel pump relay.

If necessary, eliminate the fault.

Check for 12 V voltage at contact "B3" of the fuel pump relay. If necessary, eliminate the fault in the circuit before the fuse.

Turn on the ignition, enter the command AC015 "Fuel pump relay" and check for 12 V voltage at contact "B5" of the fuel pump relay. If necessary, replace the fuel pump relay.

Using a universal contact plate, check for open and short circuits in the circuits:

- fuel pump relay, contact "B5" - contact "C" of the four-pin ignition coil (for the K7M engine);
- fuel pump relay, contact "B5" - contact "1" of individual ignition coils of cylinders No. 1 and No. 2 (for the K4M engine);
- fuel pump relay, contact "B5" - fuel pump.

If necessary, troubleshoot the fault.

If the fault persists, process other faults, then perform a conformity check.

- 2 Malfunction of the fuel pump relay control circuit:

Check the reliability of the connection and the condition of the connector to the fuel pump relay.

If necessary, eliminate the malfunction.

With the ignition on, check for 12 V at contact "B1" of the fuel pump relay. If necessary, troubleshoot the circuit to the ignition switch.

Check the fuel pump relay winding for an open circuit.

Replace the relay if necessary.

Using a universal contact plate, check for an open circuit and short circuit in the circuit:

- ECU ECM, contact "68" - contact "B2" of the fuel pump relay.

If necessary, troubleshoot the fault.

If the fault persists, process other faults, then perform a conformity check.

DF524 - Actuator relay output voltage

- 1 Circuit open or shorted

Diagnostic instructions

Fault handling priority:

First handle fault DF084 "Actuator relay control circuit" if it is current or stored.

Conditions for performing diagnostics for a stored and current fault:

The fault is defined as current after the ignition is turned on.

Check the condition of the battery and the reliability of the fastening of the terminals of the "ground" wires of the ignition system harness.

If necessary, eliminate the fault.

Check the reliability of the connection and the condition of the socket to the actuator relay.

If necessary, eliminate malfunction.

Check for 12 V voltage at contact "A3" of the rele actuators.

If necessary, eliminate the fault in the circuit up to the fuse.

With the ignition on, check for 12 V at contact "A5" of the actuator relay.

If necessary, replace the actuator relay.

Using the universal contact plate, check for open circuits and short circuits in the circuit:

- ECU ECM, contact "66" - contact "A5" of the actuator relay.

If necessary, eliminate the fault.

Check one by one for short circuits in the actuator circuits (injectors, electromagnetic valve for purging the adsorber, etc.).

If necessary, eliminate the fault.

After eliminating the fault, perform: diagnostic instructions to confirm the repair; process other faults detected by the diagnostic device, and then delete the fault information from the ECU memory; perform a conformity check.

DF587 - +5 V sensor supply voltage

- 1 Circuit open or short circuit

Diagnostic instructions

Conditions for performing diagnostics for a stored fault:

The fault is defined as current after checking the PR071 "ECU supply voltage" parameter (the measured value of the battery voltage with the ignition on and the engine not running is about 12 V):

- if the parameter has a value of about 16 V, this means a short circuit to ground;
- if the parameter has a value of about 10.7 V, this means a short circuit to +12 V in one of the 5 V supply circuits.

Check the reliability of the connection and the condition of the position sensor connectors throttle valve, absolute pressure sensor and refrigerant pressure sensor.

If necessary, repair the fault.

Using the universal contact plate, check for open and short circuits in the circuits:

- ECM, terminal "74" - terminal "B" of the throttle position sensor;
- ECM, terminal "83" - terminal "B" of the refrigerant pressure sensor;
- ECM, terminal "78" - terminal "C" of the absolute pressure sensor.

If necessary, repair the fault.

If the fault persists, process other faults and then perform a conformity check.

After repairing the fault, perform the following: diagnostic instructions to confirm repair; process other faults detected by the diagnostic device, and then delete the fault information from the ECU memory; perform conformity check.

Additional information

Throttle position sensor resistance:

- conductive track = 1200 ohms ± 240 ohms;
- moving contact ≤ 1050 ohms.

Idle speed control stepper motor resistance:

- at 25 °C = 53 ohms ± 5.3 ohms.

SAGEM four-terminal ignition coil resistance (on K7M engine):

- primary winding = 0.5 ohms ± 0.02 ohms;
- secondary winding = 11000 ohms ± 1650 Ohm.

Resistance of the individual BERU ignition coil (on the K4M engine):

- primary winding = 0.54 Ohm ± 0.03 Ohm;
- secondary winding = 10700 Ohm ± 1600 Ohm.

Resistance of the injector winding:

- at 20 °C = 14.5 Ohm ± 0.7 Ohm.

Resistance of the heating element of the upper oxygen sensor:

- at 23 °C = 3 - 15 Ohm.

Resistance of the heating element of the lower oxygen sensor:

- at 23 °C = 3 - 15 Ohm.

Resistance of the engine position and speed sensor:

- at 23 °C = 200 - 270 Ohm.

Resistance of the electromagnetic valve of the adsorber purge:

- at 23 °C = 26 Ohm ± 4 Ohm.

Table 1. Resistance of the temperature sensor Ohm from the air temperature:

-10° - 10000 ±1000 Ohm; 25° - 2000 ±120 Ohm; 50° - 810 ±48.6 Ohm; 80° - 309 ±18.5 Ohm; 110° - 135 ±8.1 Ohm

Table 2. Coolant temperature sensor resistance, Ohm:

-10° - 12000 ±1080 Ohm; 25° - 2000 ±100 Ohm; 50° - 811 ±40.5 Ohm; 80° - 282 ±8.5 Ohm; 110° - 115 ±2.3 Ohm

Checking the ignition system:

- check the condition, insulation and integrity of the high-voltage wire harnesses (for a four-pin ignition coil);
- check the condition and tightening torques of the spark plugs, as well as their compliance with the engine;
- check the condition of the ignition coil connectors;
- check the condition and resistance value of the ignition coil windings;
- with the ignition on, check for the presence of + 12 V supply voltage on the ignition coils;
- eliminate any detected faults if necessary.

Checking the fuel supply system:

- fuel pressure in the fuel line at the outlet of the fuel tank with the engine running (the fuel pump switched on) = 3.5 bar ± 0.2 bar;
- the fuel pump capacity is not less than 60 l/hour.