- Nominal voltage - 10-14 V
2. With the ignition off, disconnect the ABS control unit connector and check the resistance and conductivity between the terminals of the ABS control unit connector (see the table "Resistance between the terminals of the ABS electronic control unit connector").
3. Measure the voltage at the terminals of the ABS control unit connector with the ignition on (see table "Voltage at the terminals of the ABS control unit connector").
Note: before taking measurements, check the battery voltage (with the ignition on - 10-14 V) and the resistance between the ground terminal of the connector and the body (with the ignition off - no more than 5 Ohm).
4. Using an oscilloscope, at a vehicle speed of 30 km/h, check the signal between the terminals of the A3S control unit connector: "FL+" - "GND", "RL+" - "GND", "FR+" - "GND", "RR+" - "GND". The division value (cell) is 1 V and 2 ms.
Note: As the speed increases, the pulse width should decrease and the voltage should increase.
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5. Using an oscilloscope, at a vehicle speed of 30 km/h, check the signal between the specified terminals of the ABS control unit connector:
- (For models up to 1996.) "FLO" - "GND", "RLO" - "GND", "FRO" - "GND", "RRO" - "GND".
- (For models from 1996.) "FLO" - "GND", "SPT" - "GND".
The division value (cell) is 5 V and 2 ms.
Note: As the speed increases, the pulse width should decrease.
Table. Resistance between terminals of the ABS control unit connector.
Models before 1996.
Models since 1996.
Table Voltage at the terminals of the ABS control unit connector. Models up to 1996.
*1: models with TRC, 4WS (only for "FLO" output).
*2: 4WD models.
*3: If the ABS indicator is on, the ABS system is faulty (since the ABS indicator is on, the voltage drops from 10 - 14 to 0 V during the specified time).
Table. Voltage at the terminals of the ABS control unit connector (continuation). Models since 1996.
*1: If the ABS indicator is on, the ABS system is faulty (since the ABS indicator is on, the voltage drops from 10 - 14 to 0 V during the specified time).