Contents: Self-diagnosis when ignition is…⤓ Self-diagnosis when the ABS system…⤓ Constant self-diagnosis ⤓ Safe mode function ⤓
Self-diagnosis when ignition is turned on
The ABS-ECU unit performs self-diagnosis after the ignition is turned on. In this case, the ABS warning indicator lights up for 3 seconds. If a malfunction is detected, the indicator does not turn off. Also, if a malfunction is detected and subsequently repaired successfully, the indicator will light up until the car reaches a speed of 10 km/h when the ignition is turned on for the first time after the repair (this means confirmation of the problem solution).
Self-diagnosis when the ABS system is turned on
When the vehicle speed reaches 10 km/h, the ABS-ECU unit performs the following tests:
- checking the operation of the electric pump and electromagnetic valves (only when the ABS system is first turned on during one ignition);
- checking wheel speed sensors.
Constant self-diagnosis
The ABS-ECU unit constantly checks the following:
- eCU power supply; checks voltage;
- wheel speed sensors; checks the sensor signals - are they present during movement and do they exceed the possible value at a given vehicle speed;
- electric pump and electromagnetic valves; checks the outgoing signals and operating status - whether they correspond to each other.
Safe mode function
If a malfunction is detected during self-diagnosis, the ABS and brake system warning indicators (in the case of EBD) are turned on, and ABS and EBD are controlled as shown in the table.
* - only in vehicles with all-wheel drive.