C1073

C1O73-ABS PUMP MOTOR CONTROL CIRCUIT





When Monitored:

With the ignition on.

Set Condition:

When the Anti-Lock Brake Module indicates the ABS Pump Motor circuit fails the diagnostic test.





Diagnostic Test

1. CHECK THE ABS PUMP MOTOR FOR CONTINUOUS OPERATION

Cycle the ignition from off to on.

Monitor the ABS Pump Motor for continuous operation.

Is the ABS Pump Motor running continuously?

Yes

- Replace the Anti-Lock Brake Module in accordance with the Service Information.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 2

2. 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

Turn the ignition on.

With the scan tool read and record DTC~s.

With the scan tool, read and record Freeze Fame information.

With the scan tool, erase DTC's.

CAUTION: Ensure braking capability is available before road testing

Drive the vehicle over 40 Km/h (25 mph).

Park the vehicle and cycle the ignition switch from off to on.

With the scan tool, read and record DTC's

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

Yes

- Go To 3

No

- Refer to the INTERMITTENT CONDITION diagnostic procedure. Testing and Inspection.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

3. CHECK ABS PUMP OPERATION WITH SCAN TOOL





Cycle the ignition from off to on

With the scan tool actuate the ABS Pump Motor

Did the ABS Pump Motor operate?

Yes

- Refer to the INTERMITTENT CONDITION diagnostic procedure. Testing and Inspection

No

- Go To 4

4. CHECK THE ABS PUMP MOTOR FUSE FOR AN OPEN

Turn the ignition off

Remove and visually inspect the ABS Pump Motor fuse

Is the ABS Pump Motor fuse open?

Yes

- Go To 5

No

- Go To 6

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

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 6

No

- Repair the (A107) Fused B(+) circuit for a short to ground.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

6. CHECK THE WIRING HARNESS, TERMINALS, AND CONNECTORS





NOTE: Check all related wiring for bruised, chafed, pierced, or partially broken wires

NOTE: Check all related connectors for broken, bent, pushed out, or corroded terminals

Turn the ignition off

Visually inspect the Anti-Lock Brake Module harness connector and (A107) Fused B(+) circuit in the wiring harness for damage

Were any problems found?

Yes

- Repair as necessary
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test

No

- Go To 7

7. 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 8

No

- Repair the (A107) Fused B(+) circuit for an open
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

8. CHECK THE (Z903) GROUND CIRCUIT FOR AN OPEN





Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Measure the resistance of the (Z903) Ground circuit between the Anti-Lock Brake Module harness connector and ground

Is the resistance below 5.O ohms?

Yes

- Replace the Anti-Lock Brake Module in accordance with the Service Information.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Repair the (Z903) Ground circuit for an open.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.