DTC 1-2 Pump Motor

DIAGNOSTIC PERIOD
During initial & regular diagnosis.

DESCRIPTION OF DIAGNOSIS
- The Anti-lock Brake System (ABS) indicator light is turned on when battery voltage is detected at the Motor Check (MCK) terminal while the pump motor relay OFF signal is detected.
- The ABS indicator light is turned on when the .O V is detected at the MCK terminal while the pump motor relay ON signal is detected.

PROBABLE CAUSE
- Open circuit or short to body ground between the R/C MIRROR (7.5 A) fuse and under-hood ABS fuse/relay box.
- Open circuit or short to body ground in the Pump Motor Relay (PMR) circuit inside the underhood ABS fuse/relay box.
- Faulty pump motor relay.
- Open circuit or short to body ground in the PMR circuit between the under-hood ABS fuse/relay box and ABS control unit.
- Open circuit between the battery and under-hood ABS fuse/relay box.
- Blown ABS Motor (40 A) fuse.
- Blown ABS Unit (10 A) fuse.
- Open circuit or short to body ground in the motor drive circuit and MCK circuit inside the under-hood ABS fuse/relay box.
- Open circuit or short to body ground in the MCK circuit between the under-hood ABS fuse/relay box and ABS control unit.
- Open circuit or short to body ground between the under-hood ABS fuse/relay box and pump motor.
- Faulty pump motor.
- Open circuit between the pump motor and body ground or poor ground.
- Faulty ABS control unit.

PROBABLE CAUSE WHEN SYMPTOM DOES NOT REAPPEAR
- Intermittent interruption in the MCK circuit.
- Intermittent interruption in the pump motor relay drive circuit.
- Intermittent interruption in the pump motor drive circuit.

Refer to Diagnostic Charts. DTC 1-2