C1073

C1073-ABS PUMP MOTOR CONTROL CIRCUIT





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

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





Diagnostic Test

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. If present, diagnose and repair DTC C2116-ABS PUMP MOTOR SUPPLY LOW VOLTAGE before diagnosing this DTC.

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 40 km/h (25 mph).

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

With the scan tool, read DTCs.

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

- Go To 2

No

- Perform the ABS Intermittent Condition diagnostic procedure. Component Tests and General Diagnostics

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




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
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




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 CIRCUIT FOR AN OPEN




Measure the resistance of the (Z107) Ground circuit 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