Symptom Chart

WARNING: This page is about a different car, the 2002 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM

Condition	Possible Sources	Action
No Communication With The Anti-Lock Brake System (ABS) Module	Battery Junction Box (BJB) Fuse 3 (50A). Central Junction Box (CJB) Fuse 14 (10A). Circuitry. ABS Module.	Go To PINPOINT TEST A: NO COMMUNICATION WITH THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE .
Loss Of Sensor Signal During Vehicle Deceleration Or Sensor Signal Drops Out At Low Speed	Wheel Speed Sensor Indicator. Sensor Output Is Weak. Air Gap.	Go To PINPOINT TEST D: DTCS C1233, C1234 & C1237 WHEEL SPEED SENSOR OUTPUT FAILURE .
Unwarranted ABS Activity	Circuitry. Wheel Speed Sensor.	Go To PINPOINT TEST D: DTCS C1233, C1234 & C1237 WHEEL SPEED SENSOR OUTPUT FAILURE .
Maladjusted Rear Brakes Or "Grabby" Brake Shoe Or Pad Linings	Rear Brake Adjustment. Linings.	REFER To DISC & DRUM .
Base Brake Mechanical Concern For Wheels Lockup	Rear Brake Shoe Linings. Wheel Cylinder. Rear Brakes. Parking Brake. Rear Axle Seal.	REFER To DISC & DRUM . REFER To DISC & DRUM . REFER To DRIVELINE SYSTEM-GENERAL INFORMATION .
Base Brake Hydraulic Concern (Soft Pedal)	Brake Line Or Hose, Fitting, Master Cylinder, Wheel Cylinder Or Caliper. Air In Brake System.	REFER To DISC & DRUM .
Base Brake Mechanical Concern (Hard Pedal)	Vacuum Boost. Wheel Cylinder Or Caliper. Brake Line Or Hose.	REFER To DISC & DRUM .
Base Brake Hydraulic Concern During Medium/Hard Brake Application	Brake Line Or Hose, Fitting, Master Cylinder, Wheel Cylinder Or Caliper. Air In Brake System.	REFER To DISC & DRUM .
Base Brake Mechanical Concern During Medium/Hard Brake Application	Vacuum Boost. Wheel Cylinder Or Caliper. Brake Line Or Hose. Brake Shoe Or Pad Linings.	REFER To DISC & DRUM .
Base Brake Mechanical Concern For Vehicle Pulls	Rear Brake. Caliper. Brake Pad Or Shoe Wear.	REFER To DISC & DRUM .
Base Brake Hydraulic Concern For Vehicle Pulls	Brake Line Or Hose.	REFER To DISC & DRUM .
One Wheel Locks Up; No DTCs Recorded	Base Brake. Dump Valve. ISO Valve.	REFER To DISC & DRUM . INSTALL A New Hydraulic Control Unit (HCU). REFER To HYDRAULIC CONTROL UNIT .
The Yellow ABS Warning Indicator Does Not Selfcheck	Bulb. Circuitry. Instrument Cluster. Anti-lock Brake System (ABS) Module.	Go To PINPOINT TEST F .
Soft Or Excessive Brake Pedal	Brake Line Or Hose, Fitting, Master Cylinder, Wheel Cylinder, Wheel Cylinder Or Caliper. Air In Brake System. Hydraulic Control Unit (HCU).	REFER To DISC & DRUM .
Yellow ABS Light Always On, No DTC	Circuitry. Module.	Go To PINPOINT TEST H .