ABS control diagnostics by light codes of a MAZ car
Enter diagnostic mode
In order to control the system using light flashing codes, you must:
- - turn on the button of the remote "ground" switch and turn the key of the starter lock to the "devices" position;
- — switch the control unit to the diagnostic mode by pressing the diagnostic button 12, located under the right cover of the instrument panel (see Fig. 1), until the start light signal appears on the control lamp
If the "ASR / INF" lamp lights up for 4 s (start light signal), after which it goes out, the unit has entered the diagnostic mode.
How to display configuration and fault information
After a start light signal of 4 s, a pause of 2 s follows.
Next, information about the current ABS configuration is displayed - the ASR / INF lamp lights up 2 times for 1.5 s with a pause of 0.5 s.
After the output of the configuration code, there is a pause of 2 s and then the error codes are output.
The output of each fault code consists of two information blocks of light flashes (blinks): the 1st block and the 2nd block with a pause between them of 1 s.
If there are no faults, then the lamp will not flash (code 0-0), if there are several, then the codes will go sequentially with a pause between codes of 2 s.
During the output of the information block, the lamp flashes for 0.5 s, with a pause of 0.5 s.
How to clear fault information
If during the repair work the malfunctions were eliminated, their codes must be erased from the unit's memory. This is done by pressing the diagnostic button again (see Fig. 2) before the moment the fault codes are issued and holding the button while the codes are issued.
2 seconds after the code of the last detected fault is displayed and the button is released, the error codes will be erased.
Then the electronic unit will automatically exit the diagnostic mode, accompanied by a single flash of 0.5 s duration
Notes. 1. After the ABS system exits the diagnostic mode, automatic testing of system malfunctions is repeated.
At the same time, if the failure codes were erased, and the malfunctions themselves were not eliminated, then their codes will be re-recorded in memory.
2. The ABS configuration information cannot be erased or changed using the diagnostic button, this is done only by the diagnostic tester.
Brake Efficiency Test
The initial braking speed for the braking performance test must be at least 40 km/h.
To display information about the braking efficiency, when entering the diagnostic mode, i.e. during the issuance of a start light signal lasting 4 s, press the diagnostic button again until the second start light signal lasting 2 s appears.
2 seconds after the second start light signal, the last braking efficiency light code will be displayed in the form of 3 blocks of light flashing codes that correspond to the decimal number of the average deceleration of the vehicle (1st block, 2nd block, 3rd block, t .e. X.XX m/s2).
Each block is separated from the next by a pause of 1 s.
For example: ◙◙◙ ◙◙◙◙◙ equals 3.51m/s2.
After displaying information about the braking efficiency, the diagnostic mode is automatically exited, accompanied by a single flash of 0.5 s duration and subsequent automatic testing of system malfunctions.
Note: ABS BPO Ekran also implements the function of permanently saving information about pre-emergency modes of operation (speeds and times of rotation of the vehicle wheels) for the last 40 seconds of movement.
This information is recorded in a special memory device, the so-called black box, and can only be read during computer diagnostics by a special diagnostic tester at the service station, which is connected to the diagnostic connector 11 (see Fig. 2).
Light codes in case of malfunctions in the ABS system BPO Ekran
|
1 block |
2 block |
Defective part |
Axis wheel |
Approximate reason |
|---|---|---|---|---|
|
0 |
0 |
|
|
ABS system is OK |
|
111 |
123 |
Speed sensor left wheel front axle
|
1, А
|
Large gap, runout or defective rotor teeth Sensor short circuit Sensor break |
|
111 |
456 |
Speed sensor right wheel front axle |
1, В
|
Large gap, runout or defective rotor teeth Sensor short circuit Sensor break |
|
222 |
123 |
Speed sensor left rear axle wheel
|
2, С
|
Large gap, runout or defective rotor teeth Sensor short circuit Sensor break |
|
222 |
456 |
Speed sensor rear axle right wheel |
2, D |
Large gap, runout or defective rotor teeth Sensor short circuit Sensor break |
|
3 3 3 3 3 3 3 3 |
1 2 3 4 5 6 7 8 |
Modulator M1 (front left wheel)
|
1, А
|
Inlet valve cable break Short circuit of the intake valve to ground Release valve cable break Short circuit of the release valve to ground Short circuit between intake and exhaust valves Other modulator malfunctions Short circuit of the intake winding on the "+" board network Short circuit of the exhaust winding on the "+" board network |
|
4 4 4 4 4 4 4 4 |
1 2 3 4 5 6 7 8 |
Modulator M2 (front right wheel)
|
1, В
|
Inlet valve cable break Short circuit of the intake valve to ground Release valve cable break Short circuit of the release valve to ground Short circuit between intake and exhaust valves Other modulator malfunctions Short circuit of the intake winding on the "+" board network Short circuit of the exhaust winding on the "+" board network |
|
5 5 5 5 5 5 5 5 |
1 2 3 4 5 6 7 8 |
M3 modulator (rear left wheel)
|
1, С
|
inlet valve cable break Short circuit of the intake valve to ground Release valve cable break Short circuit of the release valve to ground Short circuit between intake and exhaust valves Other modulator malfunctions Short circuit of the intake winding on the "+" board network Short circuit of the exhaust winding on the "+" board network |
|
6 6 6 6 6 6 6 6 |
1 2 3 4 5 6 7 8 |
M4 modulator (rear right wheel)
|
1, D |
Inlet valve cable break Short circuit of the intake valve to ground Release valve cable break Short circuit of the release valve to ground Short circuit between intake and exhaust valves Other modulator malfunctions Short circuit of the intake winding on the "+" board network Short circuit of the exhaust winding on the "+" board network |
|
7 7 |
5 6 |
Power supply system |
|
The voltage on the front axle modulator control keys is below normal The voltage on the rear axle modulator control keys is below normal |
Note: 1. The letter designation of the wheels corresponds to the diagram
2. Short circuit - short circuit
For example:
◙ ◙ ◙ ◙ means fault code 3-1.
After the output of data on the last recorded malfunction or in the absence of such, an automatic exit from the diagnostic mode is performed, accompanied by a single 0.5 second flashing
After the ABS system exits the diagnostic mode, it will (automatically) retest the system faults again.