Service Information

Spark

Symptoms - Antilock Brake System

Note: The following steps must be completed before using the symptom tables.

Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true:

•	There are no DTCs set.

•	The control modules can communicate via the serial data link.

Review the system operation in order to familiarize yourself with the system functions. Refer to ABS Description and Operation .

•	Inspect for aftermarket devices which may affect the operation of the antilock brake system. Refer to Checking Aftermarket Accessories .

•	Inspect the easily accessible or visible system components, for obvious damage or conditions, which could cause the symptom.

•	Inspect the master cylinder reservoir for the correct brake fluid level.

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

•	ABS Indicator Malfunction

•	Traction Control/Stability Control Indicator Malfunction