C0269

Part 1 Of 2:

Part 2 Of 2:

CIRCUIT DESCRIPTION
The Electronic Brake Control Module (EBCM) microprocessor grounds the isolation coil to energize and close the isolation valve. This will prevent any additional brake pressure applied by the driver from reaching the wheel. Further increases in brake pressure will be prohibited. Each isolation valve is closed independently to isolate each wheel.

CONDITIONS FOR SETTING THE DTC
Isolation time (pressure hold) exceeds 120 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The ABS indicator lamp turns on
^ The ABS disables

Diagnostic Trouble Codes (DTCs) C0074 is and ignition latched DTC, which indicates that the above actions remain true until the ignition switch is turned to OFF (even if the cause of the DTC is intermittent).

CONDITIONS FOR CLEARING THE DTC
^ Repair the conditions responsible for setting the DTC
^ Use the Scan Tool Clear DTCs function

DIAGNOSTIC AIDS
Repair any other DTCs first. Then perform the Function Test of the scan tool in order to ensure proper operation of the ABS.

TEST DESCRIPTION
The numbers below refer to the steps in the diagnostic table:
3. This step determines the resistance of the power ground circuit.
4. This step determines the battery voltage available to the EBCM.
7. This step determines the resistance of the signal ground circuit.
8. This step determines the ignition voltage available to the EBCM.