Symptom Table

SYMPTOM TABLE

Condition	Possible Sources	Action
No communication with the anti-lock brake system (ABS) module	Circuitry or connection in the international standards organization (ISO) 9141 network ABS module	GO to PINPOINT TEST A .
Incorrectly adjusted rear brakes or brake shoe linings grab	Rear brake adjustment Rear brake shoe linings	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
Base brake mechanical concern for wheels lockup	Rear brake shoe linings Wheel cylinder Rear brakes	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
	Parking brake	REFER to PARKING BRAKE .
	Rear axle seal	REFER to DRIVELINE SYSTEM-GENERAL INFORMATION .
Soft pedal/spongy pedal no warning indicator	Brake line, hose, fitting, master cylinder, wheel cylinder or caliper Air in the brake system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
Base brake mechanical concern (hard pedal)	Vacuum boost Wheel cylinder or caliper Brake line or hose	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
Base brake hydraulic concern during medium/hard brake application	Brake line or hose, fitting, master cylinder, wheel cylinder or caliper Air in the brake system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
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 BRAKE SYSTEM-GENERAL INFORMATION .
Base brake mechanical concern for vehicle pulls	Rear brakes Caliper Brake pad or shoe wear	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
Base brake hydraulic concern for vehicle pulls	Brake line or hose	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
One wheel locks up; no DTCs recorded	Caliper Wheel cylinder Brake pad/shoe linings	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
One wheel locks up; no DTCs recorded	Hydraulic control unit (HCU)	INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) .
The red brake warning indicator stays on when the ignition switch is in the RUN position	Circuitry Instrument cluster Anti-lock brake system (ABS) module	REFER to PINPOINT TEST H: THE ANTI-LOCK BRAKE SYSTEM (ABS) WARNING INDICATOR IS NEVER/ALWAYS ON .
The ABS warning indicator stays on when the ignition switch is in the RUN position	Circuitry Instrument cluster Anti-lock brake system (ABS) module	REFER to PINPOINT TEST H: THE ANTI-LOCK BRAKE SYSTEM (ABS) WARNING INDICATOR IS NEVER/ALWAYS ON .
The red brake warning indicator does not self-check	Circuitry Instrument cluster Anti-lock brake system (ABS) module	REFER to PINPOINT TEST H: THE ANTI-LOCK BRAKE SYSTEM (ABS) WARNING INDICATOR IS NEVER/ALWAYS ON .
The yellow ABS warning indicator does not self-check	Circuitry Instrument cluster Anti-lock brake system (ABS) module	REFER to PINPOINT TEST H: THE ANTI-LOCK BRAKE SYSTEM (ABS) WARNING INDICATOR IS NEVER/ALWAYS ON .
The yellow ABS warning indicator self-checks OK but automatically begins flashing	Circuitry Anti-lock brake system (ABS) module Hydraulic control unit (HCU)	RETRIEVE the DTCs and REFER to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
Soft/hard/excessive brake pedal travel	Brake line, hose, fitting, master cylinder, wheel cylinder, wheel cylinder or caliper Air in the brake system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
Soft/hard/excessive brake pedal travel	HCU	INSPECT the HCU for visible signs of leaking. If any leaks are present, REPAIR or INSTALL new as necessary and bleed the brake system. REFER to BRAKE SYSTEM BLEEDING .
The yellow ABS/red brake light always on, no DTCs	Circuitry Anti-lock brake system control (ABS) module	REFER to PINPOINT TEST H: THE ANTI-LOCK BRAKE SYSTEM (ABS) WARNING INDICATOR IS NEVER/ALWAYS ON .