Pump Circuit Failure

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/in (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/in (25 mph). The CAB monitors pump voltage every 7 milliseconds.

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
PUMP HARNESS DISCONNECTED
ABS PUMP MOTOR INTERMITTENT DTC
GROUND CIRCUIT HIGH RESISTANCE
FUSED B (+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
CAB - INTERNAL FAULT
CAB - SETTING FALSE CODE