Antilock Braking System (ABS)

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Part 2 Of 2:

CIRCUIT DESCRIPTION
The solenoid valves are supplied voltage from the MaxiFuse(R) through the valve relay to operate. The EBTCM monitors the valve feed circuit to determine if a valve response to an EBTCM activation request is detected. The valve relay is an integral part of the EBTCM and cannot be replaced individually.

CONDITIONS FOR SETTING THE DTC
- 2 or more valves do not respond to an EBTCM request.
- The EBTCM senses a discrepancy such as an open or a short to ground in the circuit.

ACTION TAKEN WHEN THE DTC SETS
- A malfunction DTC is stored.
- The ABS and the TC indicator lamps are turned on.
- The ABS and the TCS are disabled.

CONDITIONS FOR CLEARING THE DTC
- The condition for the DTC is no longer present.
- The scan tool Clear DTCs function is used.
- 100 drive cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
Perform a thorough inspection of the wiring. Perform a thorough inspection of the connectors. Failure to carefully and fully inspect the wiring and the connectors may result in misdiagnosis. Misdiagnosis causes part replacement with reappearance of the malfunction.

TEST DESCRIPTION
The number(s) below refer to the step numbers on the diagnostic table.
3. This step checks for a short to ground on the EBTCM side of the fuse. Check both fuse block terminals to verify. The fuse terminals are not identified.
7. This step checks if the fuse opens when the ignition switch is turned to the RUN position, and the ABS/TCS performs the self test during the test drive.
8. This step determines if a short to ground in the BPMV is causing the open fuse. If the BPMV checks ok, the short is in the EBTCM.