DTC 7-1

DTC 7-1





Part 1 of 4





Part 2 of 4





Part 3 of 4





Part 4 of 4

NORMAL OPERATION
During the initial diagnosis, after the fail-safe relays are turned on, and during the regular diagnosis, the Anti-Lock Brake System (ABS) control unit monitors the voltage from the battery for the six solenoids (when the ABS is not functioning). If the detection circuit for the right-front solenoid detects 0 V, the ABS control unit keeps the ABS indicator light on after the engine is started. It turns the ABS indicator light on again if it detects 0 V after the light goes off.

Possible Causes
- Open circuit in the right-front solenoid drive circuits between the front fail-safe relay and ABS control unit
- Short circuit to body ground in the right-front solenoid drive circuits between the solenoids and ABS control unit
- Faulty right-front solenoid drive transistor (ON) in the ABS control unit

MORE NORMAL OPERATION
The ABS control unit momentarily outputs the ON signal to each solenoid (too momentary to turn the solenoid on) during the initial diagnosis, and each time the vehicle is driven, to check the voltage from the battery with the detection circuit. If the detection circuit for the right-front solenoids detects battery voltage at this time, the ABS control unit keeps the ABS indicator light on. It turns the ABS indicator light on again if it detects battery voltage when the vehicle is driven.

More Possible Causes
- Short circuit to power in the right-front solenoid drive circuits between the solenoids and ABS control unit.
- Faulty right-front solenoid drive transistor (OFF) in the ABS control unit.
- Short circuit to power in the right-front solenoid drive circuits in the modulator wire harness or solenoids.
- Short circuit to the right-front solenoid outlet circuit in the inlet circuit between the solenoid and ABS control unit.