C0267

Part 1 Of 2:

Part 2 Of 2:

C0267 or C0268 and C067 or C068

CIRCUIT DESCRIPTION
The pump motor circuit is integral to the BPMV. The EBCM microprocessor energizes the relay within the Electronic Brake Control Module (EBCM) in order to supply the battery voltage to the high side of the pump motor. The EBCM microprocessor grounds the low side of the pump motor when activation of the pump motor is required.

CONDITIONS FOR SETTING THE DTC (C0267)
^ The Electronic Brake Control Module (EBCM) internal relay is on
^ The pump motor is off
^ Low voltage is present from the low side of the pump motor when high voltage is expected

CONDITIONS FOR SETTING THE DTC (C0268)
^ Vehicle speed is 13 km/h (8 mph)
^ The Electronic Brake Control Module (EBCM) internal relay is on
^ The pump motor is commanded ON and then OFF
^ High voltage exists from the low side of the pump motor for 100 ms when the voltage is expected to be low

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

Diagnostic Trouble Codes (DTCs) C0267/CO268 are ignition latched DTCs, 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 Diagnostic Trouble Code (DTC)
^ Use the Scan Tool Clear DTCs function

DIAGNOSTIC AIDS

IMPORTANT: Reset the J 39200 test leads to zero prior to making any resistance measurements. Refer to the J 39200.

The pump motor is integral with the BPMV. Do not service the pump motor separately. A poor power/ground connection at the 2-way Electronic Brake Control Module (EBCM) connector or the 2-way motor harness from the EBCM to the pump motor can cause a DTC C0267. A seized pump motor, shorted pump motor windings or a poor power/ground at the 2-way EBCM connector can cause a DTC C0268. Replace the EBCM or the BPMV if the following tests show that the pump motor EBCM internal circuits have failed.

TEST DESCRIPTION
The numbers below refer to the steps in the diagnostic table:
3. This step checks for an open pump motor circuit. The pump motor circuit resistance should not be above 1.0 ohms. Reset the J 39200 test leads to zero prior to making this low resistance measurement.
5. This step determines the resistance of the Electronic Brake Control Module (EBCM) ground circuit.
7. This step determines the ignition voltage available to the EBCM.