Reading and Clearing Diagnostic Trouble Codes

Diagnostic Circuit Check






System Description
The Diagnostic Circuit Check is an organized method of identifying any problems caused by a malfunction in the ABS/DDRP system.
A service technician should begin diagnosis of any ABS/DDRP complaint with the Diagnostic
Circuit Check. The Diagnostic Circuit Check directs a service technician to the next logical step when diagnosing a complaint.
Serial Data is transmitted/received by the EBCM through terminal B6. The EBCM is supplied with constant battery feed voltage through terminals A and B. and switched ignition voltage through terminal A11. The EBCM ground is provided through terminal D and C.

Diagnostic Process
Use the following ordered procedure when servicing the ABS/DDRP system.
1. Inspect the vehicle for any mechanical conditions related the brake system.
^ Brake reservoir fluid level correct.
^ Inspect master for fluid for contamination.
^ Inspect brake master/modulator for leaks.
^ Inspect brake master/modulator for leaks.
^ Inspect brake components at all wheels.
^ Verify no brake drag exists (brake switch adjustment).
^ Verify even brake apply (no pull or lead).
^ Inspect for worn/damaged brake pads.
^ Inspect for worn/damaged wheel bearings
^ Inspect wheel speed sensors/wiring.
^ Inspect exciter rings for damage
^ Inspect tires for tread depth/wear.
^ Road test the vehicle to verify the complaint
2. Perform the Diagnostic Circuit Check and proceed to the applicable Diagnostic Trouble Chart as necessary.

Steps 1-11:

3. Clear the ABS Diagnostic Trouble Codes (DTCs) after all of the system malfunctions have been corrected.