ABS - Integrated Chassis Control

DTC C1243: BPMV Pump Motor Stalled:

DTC C1243 Schematic:

CIRCUIT DESCRIPTION
When the pump motor relay is grounded by the EBTCM, it closes and provides battery voltage to operate the pump. Once the motor circuit is energized, a Pump ON signal is sensed by the EBTCM to verify pump operation.

CONDITION FOR SETTING THE DTC
DTC C1243 can be set when the pump motor relay has been commanded OFF after the pump motor has been ON. A malfunction has occurred if the pump motor was ON, and the EBTCM sensed a stuck or slowly turning pump motor.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS/TCS/ICCS is disabled and the ABS and TRACTION CONTROL Indicator lamps are turned ON. Vehicles with ICCS2 will display the STABILITY REDUCED message on the DTC.

CONDITIONS FOR CLEARING THE DTC
Condition for DTC is no longer present and scan tool clear DTC function is used. Fifty start cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
3. Checks for good pump motor ground.
5. Checks for good pump motor ground through the BPMV.