Left Rear Sensor Circuit Failure

LEFT REAR SENSOR CIRCUIT FAILURE







- When Monitored:
With the ignition on.

- Set Condition:
If the CAB detects an open or shorted wheel speed sensor circuit, the Diagnostic Trouble Code (DTC) will set.





1. CHECK FOR DTC LEFT REAR SENSOR CIRCUIT FAILURE

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

1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTCs.

Does the scan tool display: LEFT REAR SENSOR CIRCUIT FAILURE?

Yes

- Go To 2

No

- The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
- Perform the ABS-INTERMITTENT CONDITION TEST ABS Intermittent Condition Test.

2. CHECK CONNECTOR/TERMINAL FOR DAMAGE

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

1. Turn the ignition off.
2. Inspect the Anti-Lock Brake Module harness connector, Left Rear WSS, and Left Rear WSS harness connector.

Is the Left Rear WSS or any of the connectors/terminals damaged?

Yes

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

No

- Go To 3

3. CHECK (B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT VOLTAGE




1. Disconnect the Left Rear WSS harness connector.
2. Turn the ignition on.
3. Measure the voltage of the (B4) Left Rear WSS 12 Volt Supply circuit.

Is the voltage above 10.0 volts?

Yes

- Go To 6

No

- Go To 4

4. CHECK (B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the Left Rear WSS harness connector.
3. Disconnect the Anti-Lock Brake Module harness connector.
4. Using a 12-volt test light connected to 12 volts, probe the (B4) Left Rear WSS Supply circuit.

Does the test light illuminate brightly?

Yes

- Repair the (B4) Left Rear WSS Supply circuit for a short to ground.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Go To 5

5. CHECK (B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT FOR AN OPEN




1. Connect a jumper wire between ground and the (B4) Left Rear WSS Supply circuit in the Anti-Lock Brake Controller (CAB) harness connector.
2. Using a 12-volt test light connected to 12 volts, probe the (B4) Left Rear WSS Supply circuit.

Does the test light illuminate brightly?

Yes

- Replace the Anti-Lock Brake Controller (CAB).
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Repair the (B4) Left Rear WSS Supply circuit for an open.
- Perform ABS VERIFICATION TEST ABS Verification Test.

6. CHECK (B3) LEFT REAR WSS SIGNAL CIRCUIT FOR A SHORT TO GROUND




1. Using a 12-volt test light connected to 12 volts, probe the (B3) Left Rear WSS Signal circuit.

Does the test light illuminate brightly?

Yes

- Repair the (B3) Left Rear WSS Signal circuit for a short to ground.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Go To 7

7. CHECK (B3) LEFT REAR WSS SIGNAL CIRCUIT FOR AN OPEN




1. Connect a jumper wire between ground and the (B3) Left Rear WSS Signal circuit in the Anti-Lock Brake Controller (CAB) harness connector.
2. Using a 12-volt test light connected to 12 volts, probe the (B3) Left Rear WSS Signal circuit.

Does the test light illuminate brightly?

Yes

- Go To 8

No

- Repair the (B3) Left Rear WSS Signal circuit for an open.
- Perform ABS VERIFICATION TEST ABS Verification Test.

8. CHECK (B3) LEFT REAR WSS SIGNAL CIRCUIT SHORT TO VOLTAGE




1. Turn the ignition on.
2. Remove all jumper wires.
3. Using a 12-volt test light connected between the (B3) Left Rear WSS Signal circuit and ground.

Does the test light illuminate brightly?

Yes

- Repair the (B3) Left Rear WSS Signal circuit for a short to voltage.
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Go To 9

9. CHECK (B3) LEFT REAR WSS SIGNAL CIRCUIT AND (B4) LEFT REAR WSS 12 VOLT SUPPLY CIRCUIT SHORTED TOGETHER




1. Turn the ignition off.
2. Measure the resistance between the (B3) Left Rear WSS Signal circuit and the (B4) Left Rear WSS Supply circuit.

Is the resistance above 5.0 ohms?

Yes
Go To 10
No

- Repair the (B3) Left Rear WSS Signal circuit and the (B4) Left Rear WSS Supply circuit for a short together.
- Perform ABS VERIFICATION TEST ABS Verification Test.

10. LEFT REAR WHEEL SPEED SENSOR
1. Replace the Left Rear Wheel Speed Sensor.
2. Perform ABS VERIFICATION TEST ABS Verification Test.

CAUTION: Make sure brake capability is available before road testing.

3. Road test the vehicle over 15 mph (25 km/h).

NOTE: Vehicle must be driven above 15 mph (25 km/h) for set conditions to be meet.

4. With the scan tool, read ABS DTCs.

Did DTC LEFT REAR SENSOR CIRCUIT FAILURE reset?

Yes

- Replace the Anti-Lock Brake Controller (CAB).
- Perform ABS VERIFICATION TEST ABS Verification Test.

No

- Test complete.