Control diagnostics of ABS f. Wabco car MAZ
Enter diagnostic mode
The electronic unit is switched on in the diagnostic mode by pressing the diagnostic button 12 (Fig. ) and holding it on from 0.5 to 3.0 seconds, with the ground switch and the starter and instrument switch on ( the lock must be turned on in the "devices" position)
The "ABS" lamp should be lit while holding the button.
At the same time, if the lamp was on before entering the diagnostic mode (which indicates the presence of active errors), then when the button is pressed, it goes out for about 1 second, and then a cyclically repeating active error code is generated every 4 seconds. until this problem is fixed*.
If there are multiple active errors in the system, the second active error will be flashed after the first error is resolved, and so on (until all problems are resolved).
After all active errors have been eliminated, it is necessary to turn off and turn on the starter and instrument lock to the “instruments” position.
If there are no active errors, then in the diagnostic mode, the light codes of the last 4 passive or "floating" errors are displayed sequentially (every 4 seconds), i.e. - errors that were, but were absent at the time of diagnosis (or remained not erased in the block memory) - information about passive errors is displayed 1 time.
To re-display the light code of passive errors, you must press the diagnostic button again.
Determination of the cause of a malfunction by a light flashing code
The blinking light code about the nature of the malfunction and the faulty element of the system consists of two information blocks, which are two sequences of light flashes.
The duration of each flash is 0.5 seconds, the pause between flashes is 0.5 seconds, between blocks is 1.5 seconds.
The faulty component and the nature of the fault are determined by the number of flashes of the red “ABS” warning lamp, respectively, in the first and second blocks according to table 1.
In the absence of failures or malfunctions, a light code 1-1 is displayed (one flash of a control lamp in each information block).
*An active error is an error or malfunction that is currently present, i.e. at the time of diagnosis
Light codes for the status of ABS elements f. Wabco
System control mode
In system mode, the system configuration can be determined, the last four (passive) errors can be erased from the memory of the electronic unit, the system is reconfigured and the engine control drive is tested (for speed limit mode).
To activate the system mode, press the diagnostic button (Figure) and hold it down in the on state from 3.0 to 6.3 sec.*
After activating the system mode, a configuration light code is displayed (a 4S / 4K sensor / 4 modulator type system is installed on MAZ vehicles), the number of lamp flashes should be 2.
Configuration code repeats every 4 seconds.
To exit the system mode, you must turn off and then turn on the starter and instrument switch to the "instruments" position, or press the diagnostic button for more than 6 seconds.
Erasing errors
Only passive errors stored in the memory of the electronic unit are erased.
To erase errors, you must activate the system mode, as described above. This will be followed by eight quick (0.1 second duration) flashes of the ABS warning light to confirm the erasure.
This is followed by a configuration code that repeats periodically every 4 seconds (two light flashes lasting 0.5 seconds with a pause of 1.5 seconds).
Then it is necessary to turn off and re-enable the starter and instrument switch to the “instrument” position.
Exit diagnostic mode
Exit the diagnostic mode by turning off the power (the starter and instrument switch to the "off" position).
To exit the diagnostic mode without turning the lock to the “off” position, press the diagnostic button for 6 to 15 seconds. In this case, the output of light codes to the red control lamp "ABS" stops.
If it is difficult to erase a fault code (after repeated erasing operations, the same code remains), you must once again check that the corresponding fault has been eliminated and repeat Repeat operations until code 1 -1 is received.
*Notes:
1. When the system mode is activated, all passive errors are automatically erased if they were in the unit's memory. This will be indicated by 8 quick flashes of the ABS warning light.
If there are active errors, then the specified blinks will not follow, and the configuration code will be issued immediately;
2. If the system is enabled according to the ABS / PBS scheme, i.e. a proportional and (or) differential valve (PBS valve) is connected, then when entering the system mode, the “ABS / INF” lamp additionally lights up and does not go out until the diagnostic mode is exited
|
light code |
Faulty element, nature of the fault |
|
|---|---|---|
|
Ра |
Рб |
|
|
1 |
1 |
All items are correct |
|
2 |
1 |
Modulator B: Open or short to ground |
|
2 |
2 |
Modulator A: Open or short to ground |
|
2 |
3 |
Modulator D: Open or short to ground |
|
2 |
4 |
Modulator C: Open or short to ground |
|
3 |
1 |
Sensor B: Large air gap |
|
3 |
2 |
Sensor A : large air gap |
|
3 |
3 |
Sensor D: large air gap |
|
3 |
4 |
Sensor C: large air gap |
|
4 |
1 |
Sensor B: Short circuit or open circuit |
|
4 |
2 |
Sensor A: Short circuit or open circuit |
|
4 |
3 |
Sensor D: Short circuit or open circuit |
|
4 |
4 |
Sensor C: Short circuit or open circuit |
|
5 |
1 |
Sensor B: Moving signal |
|
5 |
2 |
Sensor A: Moving signal |
|
5 |
3 |
Sensor D: Moving signal |
|
5 |
4 |
Sensor C: Moving signal |
|
6 |
1 |
Sensor B: rotor/sensor defective |
|
6 |
2 |
Sensor A: rotor/sensor defective |
|
6 |
3 |
Sensor D: rotor/sensor defective |
|
6 |
4 |
Sensor C: rotor/sensor defective |
|
7 |
1 |
Communication with VU: communication error |
|
7 |
3 |
Retarder relay short or open |
|
7 |
4 |
ABS lamp: short circuit or open circuit |
|
8 |
1 |
Control unit power supply: reduced voltage of the on-board network |
|
8 |
2 |
Control unit power supply: increased voltage of the on-board network |
|
8 |
3 |
Internal error |
|
8 |
4 |
Configuration error |
|
8 |
5 |
Control unit power supply: ground connection error |
