Symptom Chart

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Symptom Chart

Condition	Possible Sources	Action
No communication with the ABS module	Fuse(s) Wiring, terminals or connectors ABS module	REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the no communication concern.
The yellow ABS warning indicator is always/never on	DTCs present in the ABS module ABS module Instrument cluster	RETRIEVE and RECORD any ABS module DTCs. Go to the ABS Module DTC Chart. If there are no DTCs present in the ABS module, REFER to Diagnosis and Testing in INSTRUMENT CLUSTER article.
The traction control indicator (in the instrument cluster) is always/never on	DTCs present in the ABS module or PCM PCM Instrument cluster	RETRIEVE and RECORD any ABS module DTCs. Go to the ABS Module DTC Chart. If there are no DTCs present in the ABS module, RETRIEVE and RECORD any PCM DTCs. REFER to the Content Not Found article. If there are no PCM DTCs, REFER to Diagnosis and Testing in INSTRUMENT CLUSTER article.
Spongy brake pedal with no warning indicator	Air in brake hydraulic system	REFER to BRAKE SYSTEM - GENERAL INFORMATION article.
Unintended ABS activation	Mismatched tire sizes or over/underinflation	VERIFY that all tires are the correct size for the vehicle and that all tires are inflated to the correct pressure as indicated on the vehicle certification (VC) label. INSTALL new tires or ADJUST the tire pressure as necessary.
	Wheel speed sensor ring(s)	INSPECT the sensor ring. INSTALL a new ring if damaged. REFER to FRONT SUSPENSION - REAR WHEEL DRIVE (RWD) article or FRONT SUSPENSION - FOUR WHEEL DRIVE (4WD) article for a front speed sensor ring. REFER to REAR DRIVE AXLE/DIFFERENTIAL - FORD 8.8-INCH RING GEAR article, REAR DRIVE AXLE/DIFFERENTIAL - FORD 9.75-INCH RING GEAR article or REAR DRIVE AXLE/DIFFERENTIAL - FORD 10.25-INCH RING GEAR article for a rear sensor ring.
	Incorrect axle ratio configuration in ABS module	CHECK the ABS module axle ratio against as-built information, RECONFIGURE the ABS module as necessary.
	Wheel speed sensor(s) ABS module	Go to Pinpoint Test D .
The traction control system is inoperative	Traction control system is turned off Traction control system is not configured Fuse Wiring, terminals or connectors ABS wheel speed sensor fault High-speed controller area network (HS-CAN) bus fault PCM	Go to Pinpoint Test F .
The traction control system cannot be disabled/enabled	Fuse Wiring, terminals or connectors Traction control switch PCM	Go to Pinpoint Test F .
The traction control OFF indicator (in the switch) is always on	Wiring, terminals or connectors Traction control switch PCM	Go to Pinpoint Test G .