DTC 1

DTC 1





Part 1 of 2





Part 2 of 2

NOTE:
- The ABS indicator light comes on twice, once for two seconds during the bulb check, then again, indicating DTC 1.

NORMAL OPERATION
The ABS control unit monitors the pump motor relay drive signal during the initial diagnosis and individual diagnosis when the ABS is not functioning. When the ABS control unit detects the drive signal for 40 seconds, it turns the pump motor relay off and turns the ABS indicator light on.

Possible Causes
- Pressure switch stuck OFF.
- Open circuit between the pressure switch and ABS control unit.
- Open circuit in the P-SW circuit between the pressure switch and body ground, or a poor ground.
- Drop in pump discharge volume.
- Leaking outlet valve.
- Leaking relief valve.
- Brake fluid leakage in the ABS operation system.
- Faulty ABS control unit.
- Air trapped in the modulator.