C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.
Set Condition:
When the Left Front Wheel Speed Sensor circuit fails the diagnostic test.

Possible Causes

CONNECTOR/TERMINAL DAMAGE

(B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORTED TO VOLTAGE, GROUND OR OPEN

(B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN

(B8) LEFT FRONT WSS SIGNAL CIRCUIT AND (B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORTED TOGETHER

LEFT FRONT WSS

ANTI-LOCK BRAKE MODULE

Diagnostic Test

1. CHECK FOR DTC C100A–LEFT FRONT WHEEL SPEED SENSOR CIRCUIT

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.
With the scan tool, read DTCs.

Does the scan tool display: C100A–LEFT FRONT WHEEL SPEED SENSOR CIRCUIT?

Yes

Go To 2

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.
Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)

2. CHECK CONNECTOR/TERMINAL FOR DAMAGE

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

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

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

Yes

Repair as necessary.

Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

Go To 3

3. CHECK (B9) LEFT FRONT WSS SUPPLY CIRCUIT VOLTAGE

Disconnect the Left Front WSS harness connector.
Turn the ignition on.
Measure the voltage between the (B9) Left Front WSS Supply circuit and ground.

Is the voltage above 10 volts?

Yes

Go To 6

Go To 4

4. CHECK (B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORT TO GROUND

Disconnect the Anti-Lock Brake Module harness connector.
Using a 12-volt test light connected to 12-volts, probe the (B9) Left Front WSS Supply circuit.

Does the test light illuminate brightly?

Yes

Repair the (B9) Left Front WSS Supply circuit for a short to ground.

Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

Go To 5

5. CHECK (B9) LEFT FRONT WSS SUPPLY CIRCUIT OPEN

Connect a jumper wire between ground and the (B9) Left Front WSS Supply circuit in the Anti-Lock Brakes Module harness connector.
Using a 12-volt test light connected to 12-volts, probe the (B9) Left Front WSS Supply circuit.

Does the test light illuminate brightly

Yes

Go To 6

Repair the (B9) Left Front WSS Supply circuit for an open.
Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

6. CHECK (B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORT TO VOLTAGE

Turn the ignition on.
Measure the voltage between the (B8) Left Front WSS Signal circuit and ground.

Is the voltage above one volt?

Yes

Repair the (B8) Left Front WSS Signal circuit for a short to voltage.

Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

Go To7

7. CHECK (B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORT TO GROUND

Turn the ignition off.
If not done previously, disconnect the Anti-Lock Brake Module harness connector.
Using a 12-volt test light connected to 12-volts, probe the (B8) Left Front WSS Signal circuit.

Does the test light illuminate brightly?

Yes

Repair the (B8) Left Front WSS Signal circuit for a short to ground.

Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

Go To 8

8. CHECK (B8) LEFT FRONT WSS SIGNAL CIRCUIT OPEN

Connect a jumper wire between ground and the (B8) Left Front WSS Signal circuit in the Anti-Lock Brakes Module harness connector.
Using a 12-volt test light connected to 12-volts, probe the (B8) Left Front WSS Signal circuit.

Does the test light illuminate brightly?

Yes

Go To 9

Repair the (B8) Left Front WSS Signal circuit for an open.
Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

9. CHECK (B8) LEFT FRONT WSS SIGNAL CIRCUIT AND (B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORT TOGETHER

Remove all jumper wires.
Measure the resistance between the (B8) Left Front WSS Signal circuit and the (B9) Left Front WSS Supply circuit.

Is the resistance above 5.0 ohms?

Yes

Go To 10

Repair the (B8) Left Front WSS Signal circuit and the (B9) Left Front WSS Supply circuit for a short together.
Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

10. LEFT FRONT WHEEL SPEED SENSOR

Replace the Left Front Wheel Speed Sensor in accordance with the Service Information.
Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

CAUTION: Ensure brake capability is available before road testing.

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 ABS DTCs.

Did DTC C100A–LEFT FRONT WHEEL SPEED SENSOR CIRCUIT reset?

Yes

Replace the Anti-Lock Brakes Module in accordance with the Service Information.
Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

Test Complete.