Pump Circuit Failure

Test 1:

Test 2-6:

Test 7-10:

Test 11:

Symptom
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 run at 40 km/h (25 mph). The CAB monitors pump voltage continuously.

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 seconds. 3) Pump is turned on by the CAB, but without sufficient voltage to operate it.


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