System Tests: Notes

Perform ABS FUNCTIONAL CHECK  under TROUBLESHOOTING before using SYMPTOM INDEX  . If any ABS trouble codes are set, see ABS TROUBLE CODE DEFINITIONS  under SELF-DIAGNOSTIC SYSTEM.

If no trouble codes are set, diagnose system by symptom. See SYMPTOM INDEX  .

Symptom	Go To Test
Brake Light Switch, Control Pressure Switch Or Piston Travel Switches Are Inoperative	A
DTC B421, B480 OR B481 Present	B
No Power Assist (With Or Without Brake Lamp On)	C
High Pedal Effort (With OR Without Brake Lamp On)	C
Pump Does Not Run	C
Pump Runs For Extended Periods OF Time	C
Brake Lamp Stays On For More Than 20 Seconds After Key-On	C
Brake Lamp Comes On While Braking	C
Brake Boost System Will Not Hold Pressure (Excessive Pressure Leakdown)	C
Brake Lamp Inoperative During Segment Check	D
LOW BRAKE FLUID Message Displayed At Key-On	E
BRAKE Lamp On & Power Assist Is Available	F
No System Power	G
Valve Cycling (Chatter) During Normal Stops	H
Low Or Spongy Brake Pedal	J
ANTI-LOCK DISABLED Message Displayed & No ABS Codes Present	K