C1074

C1074-ABS PUMP MOTOR CONTROL CIRCUIT PERFORMANCE





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Continuous

- Set Condition:
The ABM detects low pump motor feedback voltage with actuation of the pump motor relay.





Diagnostic Test

1. CHECK FOR A DTC C1074-ABS PUMP MOTOR CONTROL CIRCUIT PERFORMANCE
NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.
With the scan tool, record and erase DTCs.
Cycle the ignition switch from off to on.
Road test the vehicle over 10 km/h (7 mph).

NOTE: Vehicle must be driven above 10 km/h (7 mph) for set conditions to be meet.

With the scan tool, read DTCs.
Does the scan tool display: C1074-ABS PUMP MOTOR CONTROL CIRCUIT PERFORMANCE?

Yes

- Go To 2

No

- REFER TO the INTERMITTENT CONDITION diagnostic procedure. Checking For An Intermittent DTC.
- REFER TO the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.

2. CHECK THE ABS PUMP MOTOR FUSED B+ FOR AN OPEN
Turn the ignition off.
Remove and visually inspect the ABS Pump Motor B+ fuse.
Is the ABS Pump Motor B+ fuse open?

Yes

- Go To 3

No

- Go To 5

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




Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Using a 12-volt test light connected to 12-volts, probe the (A107) Fused B+ circuit.
Does the test light illuminate brightly?

Yes

- Repair the (A107) Fused B(+) circuit for a short to ground.
- PERFORM ABS VERIFICATION TEST. ABS Verification Test

No

- Go To 4

4. CHECK THE (A107) FUSED B(+) CIRCUIT
Turn the ignition off.
Visually inspect the (A107) Fused B(+) circuit in the wiring harness.
Look for any signs of intermittent short to ground.
Is the wiring harness OK?

Yes

- Go To 5

No

- Repair the (A107) Fused B(+) circuit for a short to ground.
- PERFORM ABS VERIFICATION TEST. ABS Verification Test

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




Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Measure the voltage of the (A107) Fused B(+) circuit in the Anti-Lock Brake Module harness connector.
Is the voltage above 10 volts?

Yes

- Go To 6

No

- Repair the (A107) Fused B(+) circuit for an open.
- PERFORM ABS VERIFICATION TEST. ABS Verification Test

6. CHECK THE (Z107) GROUND CIRCUITS FOR AN OPEN




Measure the resistance of the (Z107) Ground circuits between the Anti-Lock Brake Module harness connector and ground
Is the resistance below 5.0 ohms?

Yes

- Replace the ICU.
- PERFORM ABS VERIFICATION TEST. ABS Verification Test

No

- Repair the high resistance in the affected circuit.
- PERFORM ABS VERIFICATION TEST. ABS Verification Test