Pump Motor Fault

Test 1 And 2:

Tests 3 Through 8:

Tests 9 Through 11:

Symptom:
PUMP MOTOR FAULT

When Monitored and Set Condition:
PUMP MOTOR FAULT

When Monitored:
1. Ignition turned on for at least 3.5 seconds.
2. ABS main relay command given for at least 15 milliseconds.
3. CAB pump motor command never given during the current ABS main relay command.

Set Condition:
4. Low feedback voltage from the low side of pump motor.
5. Criteria 1 - 4 satisfied for 30 consecutive controller checks spaced 5 milliseconds apart.

POSSIBLE CAUSES
FUSED B (+) CIRCUIT OPEN
FUSED B (+) CIRCUIT INTERMITTENT SHORT TO GROUND
FUSED B (+) CIRCUIT SHORT TO GROUND
PUMP MOTOR CONNECTOR OBSERVABLE DEFECT
PUMP MOTOR WIRING HARNESS OBSERVABLE DEFECT
PUMP MOTOR/HCU DEFECTIVE (OPEN)
PUMP MOTOR/HCU DEFECTIVE (SHORTED TO GROUND)
CAB GROUND CIRCUIT(S) OPEN
CAB CONNECTOR OBSERVABLE DEFECT
CAB DEFECTIVE