Symptom Chart

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for information about these practices.

Condition	Possible Sources	Action
No communication with the ABS module	Fuse(s) Wiring, terminals or connectors ABS module	REFER to Module Communications Network to diagnose the no communication problem.
The red brake warning indicator is always on or never on	Low brake fluid level Brake fluid level sensor Parking brake applied Parking brake switch Brake booster vacuum sensor IPC concern ABS concern	RETRIEVE all ABS module DTCs and REFER to the ABS Module DTC Chart . If no ABS module DTCs are present, REFER to Diagnosis and Testing in Instrumentation, Message Center, and Warning Chimes .
The yellow ABS warning indicator is always on or never on	IPC concern ABS concern	RETRIEVE all ABS module DTCs and REFER to the ABS Module DTC Chart . If no ABS module DTCs are present, REFER to Diagnosis and Testing in Instrumentation, Message Center, and Warning Chimes .
The stability-traction control indicator "sliding-car icon" is always on or never on	IPC concern ABS concern	RETRIEVE all ABS module DTCs and REFER to the ABS Module DTC Chart . If no ABS module DTCs are present, REFER to Diagnosis and Testing in Instrumentation, Message Center, and Warning Chimes .
ABS false activation, ABS too sensitive, ABS activates on normal stop	Front/rear suspension concern	ELIMINATE the front/rear suspension as the cause of the problem. REFER to Suspension System - General Information .
	RCM mounting	CONFIRM the RCM is mounted correctly. REFER to Supplemental Restraint System .
	Loose wheel speed sensor/excessive air gap	INSPECT wheel speed sensor for looseness or excessive air gap. TIGHTEN or INSTALL new as necessary. REFER to Wheel Speed Sensor - Front and/or Wheel Speed Sensor - Rear .
	Wheel speed sensor magnetic strip (encoder) damaged, rusted or contaminated with foreign material	INSPECT the encoder for damage, rust and foreign material. CLEAN, REMOVE foreign material or INSTALL new as necessary. REFER to Wheel Bearing and Wheel Hub in Front Suspension or Rear Suspension .
	Parking brake shoes out of adjustment (dragging)	CHECK and if necessary, ADJUST the parking brake shoes.
The stability-traction control system is inoperative or cannot be disabled	Refer to the Diagnostic Routine	GO to Pinpoint Test Q .
The hill start assist feature is inoperative, cannot be disabled or enabled	Network concern IPC concern PCM concern RCM concern ABS module concern	RETRIEVE all IPC DTCs and REFER to Diagnosis and Testing in Instrumentation, Message Center, and Warning Chimes . If no DTCs are present in the IPC, CARRY OUT the PCM KOEO self-test and REFER to Diagnosis and Testing in Electronic Engine Controls . If no DTCs are present in the PCM, CARRY OUT the RCM self-test and REFER to Diagnosis and Testing in Supplemental Restraint System . If no DTCs are present in the RCM, CARRY OUT the ABS module self-test. DIAGNOSE all ABS module DTCs.