Troubleshooting
DTC 7-4: Rear Solenoid
During the initial diagnosis, after the fail-safe relays are turned on, and during the regular diagnosis, the 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 rear solenoids 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:
Rear fail-safe relay stuck OFF
Open circuit in the rear solenoid drive circuits between the under-hood fuse/relay box and ABS control unit
Short circuit to body ground in the rear solenoid drive circuits between the solenoids and ABS control unit
Faulty rear solenoid drive transistor (ON) in the ABS control unit
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 rear solenoids detects battery voltage at this time, the ABS control unit keeps the ABS indica-
tor light on. It turns the ABS indicator light on again if it detects the battery voltage when the vehicle is driven.
Possible causes:
Short circuit to power in the rear solenoid drive circuits between the solenoids and ABS control unit
Faulty rear solenoid drive transistor (OFF) in the ABS control unit
Short circuit to power in the rear solenoid drive circuits in the modulator wire harness or solenoids
Short circuit to the rear solenoid outlet circuit in the inlet circuit between the solenoids and ABS control unit
Short circuit to the right-front or left-front solenoid inlet or outlet circuit in the rear solenoid inlet or outlet circuit
between the solenoids and ABS control unit
Does the ABS indicator light go
off?
The system is OK at this time.
Check the wire harness and con-
nectors between the ABS control
unit, fail-safe relay and modulator
unit (intermittent open or short
circuit).
Is code 7-4 indicated?
Perform the appropriate trouble-
shooting for the code.
(To page
19-87
)
Confirm the DTC that appears first.
Problem verification:
Start the engine.
With engine running, ABS indi-
cator light is ON.
With the SCS service connec-
tor connected (see page
19-40
), DTC 7-4 is indicated.
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