C0020-16

C0020-16-ABS PUMP MOTOR CONTROL-CIRCUIT VOLTAGE BELOW THRESHOLD





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the ignition on and no system under voltage condition present.

- Set Condition:
The motor voltage supplied to the Anti-lock Brake System (ABS) Module is 50 percent of ignition voltage.





1. CHECK THE FUSE
1. Ignition on, engine not running.
2. Using a 12-volt test light connected to ground, check the fuse for power.

Is the fuse good?

Yes

- Go To 3

No

- Go To 2

2. (A107) FUSED B+ CIRCUIT SHORTED TO GROUND




1. Turn the ignition off to the lock position.
2. Remove the J06 40A Fuse.
3. Disconnect the ABS Module harness connector.
4. Measure the resistance between Ground and the (A107) Fused B+ Circuit in the ABS Module harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Go To 3

No

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

3. ABS PUMP MOTOR
1. Install the J06 40A Fuse.
2. Ignition on, engine not running.
3. With the scan tool, read and record the DTCs.
4. With the scan tool, actuate the ABS pump motor.

Did the Pump Motor operate correctly when actuated with out blowing the fuse?

Yes

- Go To 4

No

- Go To 5

4. (A107) FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE




1. Turn the ignition off to the lock position.
2. Disconnect the ABS Module harness connector.
3. Using a 12-volt test light connected to ground, check the (A107) Fused B+ circuit.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Go To 5

No

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

5. ANTI-LOCK BRAKE SYSTEM (ABS)
1. Turn the ignition off to the lock position.
2. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
3. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Replace the Anti-lock Brake System (ABS) Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.