C1274

CIRCUIT DESCRIPTION
The pressure switch monitors primary brake system pressure. The switch, normally closed, opens when the brakes are applied and pressure exceeds 700 kPa (101 psi).

If the brakes are applied manually during traction control mode, the BPMV pressure switch input, along with the brake switch input, signal the EBTCM to disable traction control and allow manual braking. The pressure switch is part of the BPMV assembly and is not serviceable.

CONDITIONS FOR SETTING THE DTC
DTC C1274 sets when the EBTCM detects an open or short to ground in the BPMV pressure switch circuitry.

ACTION TAKEN WITH THE DTC SETS
The following actions are taken when the DTC sets:
^ DTC C 1274 is stored
^ TCS is disabled
^ The TRACTION OFF indicator lamp is turned ON

CONDITIONS FOR CLEARING THE DTC
The DTC will clear under following conditions:
^ Conditions for the malfunction are no longer present. Use the scan tool clear DTCs function.
^ 100 ignition switch key cycles have passed without detecting any malfunctions

DIAGNOSTIC AIDS
^ The following conditions may be other possible causes for this malfunction:
- The TCC/antilock switch circuit is open or shorted to voltage
- The BPMV fluid level switch circuit is open or shorted to voltage
- The ABS pump motor pressure switch circuit is open or shorted to voltage
^ Perform a thorough inspection of the wiring and the connectors.

Failure to carefully inspect wiring may result in a misdiagnosis. A misdiagnosis may result in replacing parts without repairing the malfunction.
^ DTC C1274 may also store along with DTC C1245. Diagnose DTC C1245 first before diagnosing DTC C1274.

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DTC C1274 BPMV PRESSURE SWITCH CIRCUIT MALFUNCTION