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Symptom: PUMP CIRCUIT FAILURE When Monitored and Set Condition: PUMP CIRCUIT FAILURE When Monitored: Ignition on. The CAB commands the pump on at 20 km/h (12 mph) to check its operation, if the brake switch is not applied. If the brake is applied, the test will Set Condition: The DTC is stored when the CAB detects: 1) Improper voltage decay after the pump was turned off. 2) Pump not energized by the CAB, but voltage is present for 3.5 POSSIBLE CAUSES CAB - PUMP MOTOR RUNNING CONTINUOUSLY ABS PUMP FUSE ABS PUMP MOTOR INTERMITTENT DTC DAMAGED CAB/CAB HARNESS CONNECTOR ABS PUMP FUSED B(+) CIRCUIT INTERMITTENT SHORT TO GROUND ABS PUMP FUSED B(+) CIRCUIT SHORT TO GROUND CAB - INTERNAL FAULT ABS PUMP MOTOR INOPERATIVE ABS PUMP MOTOR OPEN ABS PUMP MOTOR B(+) CIRCUIT OPEN ABS PUMP MOTOR GROUND CIRCUIT OPEN CAB - INTERNAL FAULT TEST ACTION APPLICABILITY 1 Turn the ignition off. All Yes → Replace the Controller Antilock Brake in accordance with the Service Information. No → Go To 2 25 BRAKES (CAB) |