Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. 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 anti-lock brake system (ABS) module	Fuse ABS module Circuitry	GO to PINPOINT TEST F .
Poor vehicle tracking during anti-lock function	Air in brake hydraulic system Hydraulic control unit (HCU)	GO to PINPOINT TEST G .
Poor vehicle tracking during anti-lock function	Base brake system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
The traction control is inoperative	Anti-lock brake system (ABS) module Electronic control unit (ECU)	GO to PINPOINT TEST H .
The traction control is inoperative	Base brake system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
The yellow (ABS) anti-lock brake system warning indicator does not self-check	Instrument cluster Circuitry	GO to PINPOINT TEST I .
The yellow anti-lock brake system (ABS) warning indicator always on	ABS module connector not connected	CONNECT the ABS module connector C135.
	Circuitry ABS module	GO to PINPOINT TEST J .
	Instrument cluster	Section 418-00.
Traction control active indicator never on	ABS module Circuitry Instrument cluster	REFER to INSTRUMENT CLUSTER .
The traction control cannot be disabled	Circuitry Traction control switch ABS module	GO to PINPOINT TEST H .
Traction control switch indicator is always on	Circuitry Traction control switch ABS module Lighting control module (LCM)	GO to PINPOINT TEST L .
Traction control switch indicator is never on	Circuitry Traction control switch ABS module Lighting control module (LCM) Instrument cluster	GO to PINPOINT TEST M .
Red brake warning indicator always on without anti-lock brake system (ABS) lamp	Parking brake Brake fluid level	REFER to BRAKE SYSTEM-GENERAL INFORMATION .