C1073–ABS PUMP MOTOR CONTROL CIRCUIT

For a complete wiring diagram Refer to Section 8W.

When Monitored:
When the ABS Pump Motor is activated.
Set Condition:
The ABM detects low pump motor feedback voltage with actuation of the pump motor relay.

Possible Causes

BLOWN PUMP FUSE

WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE

HIGH RESISTANCE IN B+ CIRCUITS

HIGH RESISTANCE IN GROUND CIRCUITS

INTEGRATED CONTROL UNIT

1.CHECK FOR A DTC C1073-ABS PUMP MOTOR CONTROL CIRCUIT

NOTE: This DTC must be active for the results of this test to be valid.

NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet.

NOTE: The Anti-Lock Brake Module must sense ALL 4 wheels at 12 km/h (7.5 mph) before it will extinguish the ABS indicators.

Does the scan tool display: C1073-ABS PUMP MOTOR CONTROL CIRCUIT?

Yes

Refer to the INTERMITTENT CONDITION diagnostic procedure.
Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)

2.INSPECT RELATED WIRING HARNESS, TERMINALS, & CONNECTORS

Were any problems found?

Yes

3.CHECK THE ABS PUMP MOTOR FUSED B+ FOR AN OPEN

Is the ABS Pump Motor B+ fuse open?

Yes

4.CHECK THE (A107) FUSED B(+) FOR A SHORT TO GROUND

Does the test light illuminate brightly?

Yes

5.CHECK THE (A107) FUSED B(+) CIRCUIT

Is the wiring harness OK?

Yes

6.CHECK THE VOLTAGE ON THE (A107) FUSED B(+) CIRCUIT

Is the voltage above 10 volts?

Yes

7.CHECK THE (Z127) AND (Z107) GROUND CIRCUITS FOR AN OPEN

Is the resistance below 5.0 ohms?

Yes