Symptom Chart

Condition	Possible Sources	Action
No communication with the ABS module	Fuse Circuitry ABS module	REFER to MODULE COMMUNICATIONS NETWORK to diagnose the no communication concern.
ABS false activation, ABS too sensitive, ABS activates on normal stop	Front anti-lock brake sensor tone rings	INSPECT both front wheel speed sensor tone rings for damaged teeth. INSTALL new as necessary.
	Chafed wire insulation or pinched wire	INSPECT the wiring harness from the front wheel speed sensor knuckle to the frame and from the rear axle to the frame. REPAIR or INSTALL new as necessary.
	Rear wheel speed sensor, excessive variance in air gap between wheel speed sensor and sensor tone ring	INSPECT both rear wheel speed sensor tone rings for damaged teeth. INSTALL new as necessary.
	Open or shorted wheel speed sensor circuit	Go to Pinpoint Test C .
	Rear wheel speed sensor tone rings	INSPECT the rear wheel speed sensor tone rings. INSTALL new as necessary.
	Wheel speed sensor	Go to Pinpoint Test D .
The yellow ABS warning indicator and the red brake warning indicator are illuminated	One or more DTCs are present in the ABS module	RETRIEVE and RECORD the DTCs. REFER to ABS MODULE DTC CHART , STEERING ANGLE SENSOR MODULE DTC CHART or INSTRUMENT CLUSTER MODULE DTC CHART .
The yellow ABS warning indicator does not self-check	Instrument cluster Brake fluid level Circuitry ABS module	REFER to Diagnosis and Testing in INSTRUMENT CLUSTER .
The stability/traction control switch indicator is inoperative	Instrument cluster Circuitry Traction control switch	Go to Pinpoint Test K .