DTC 54 (Main Relay Stuck Off)

ABS INDICATOR LIGHT "ON"

DIAGNOSIS - Main Relay Stuck "OFF" DTC 54

DETECTION TIMING
Initial Diagnosis - yes
Except ABS Control - yes
During ABS Control - yes
During Warning - no

PROBABLE CAUSE
- Open, short to body ground and/or blown fuse in the B1 or B2 circuit.
- Short to body ground and/or short to power in the COM circuit.
- Faulty modulator unit.
- Faulty ABS control unit.

CONDITION FOR DETECTION
- When a solenoid valve failure is detected, the CPU checks the voltage of the main relay output. If the voltage is lower than a given voltage, the ABS indicator light comes on.
- The main relay repeats ON/OFF switching at all times. When the main relay is off, a short test pulse is sent to each valve. The CPU monitors the reference voltage. If the voltage is out of a given range, the ABS indicator light comes on.

MANAGEMENT
During ABS Control - System down
Except ABS Control - System down