C0031-62
C0031-62-LEFT FRONT WHEEL SPEED SENSOR - SIGNAL COMPARE FAILURE
For a complete wiring diagram, refer to the Wiring Information.
- When Monitored:
With the ignition on, no system under voltage or over voltage condition present, no open or shorted wheel speed sensor DTCs set, vehicle not under high acceleration, and vehicle speed greater than 0.
- Set Condition:
This DTC will be set if the wheel speed signal is 0 km/h (0 mph) or very low when compared to the other wheel speed signals.
1. VERIFY THE DTC IS ACTIVE
NOTE: If DTC C0031-1D is present, perform the diagnostics for this DTC before continuing with this diagnostic procedure.
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
CAUTION: Make sure brake capability is available before road testing.
3. 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 met.
4. With the scan tool, read DTCs.
Is the DTC active at this time?
Yes
- Go To 3
No
- Go To 2
2. CHECK WHEEL SPEED SENSOR SIGNALS
1. Turn the ignition on.
2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle.
NOTE: If graph shows periodic dropouts pay close attention to the tone wheel.
3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph).
Is the Left Front WSS speed showing 0 km/h (0 mph), not matching other wheels, or showing erratic behavior?
Yes
- Go To 3
No
- Perform ABS INTERMITTENT CONDITION diagnostic procedure. Testing and Inspection.
3. CHECK FOR IMPROPER LEFT FRONT TIRE PRESSURE/MISMATCHED TIRES
1. Turn the ignition off.
2. Check and adjust the Left Front Tire pressure.
3. Check and adjust all other tire pressures.
4. Inspect for mismatched tires on vehicle.
Is the Left Front Tire improperly inflated or mismatched tires on vehicle?
Yes
- Repair as necessary
- Perform the ABS VERIFICATION TEST. ABS Verification Test.
No
- Go To 4
4. CHECK LEFT FRONT WSS FOR LOOSENESS, INSPECT CIRCUITS/CONNECTORS/TERMINALS FOR DAMAGE
NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals.
1. Turn the ignition off to the lock position.
2. Inspect the ABS Module harness connector and the Left Front WSS harness connector.
3. Check the Left Front WSS for looseness, excessive corrosion and not properly fastened.
4. Inspect the (B8) Left Front WSS Signal and (B9) Left Front WSS Supply circuits between the Left Front WSS and Anti-Lock Brake Module for damage.
Is the Left Front WSS loose or any of the wiring/connectors/terminals damaged?
Yes
- Repair as necessary.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.
No
- Go To 5
5. CHECK LEFT FRONT WHEEL SPEED SENSOR FOR DAMAGE
1. Remove the Left Front Wheel Speed Sensor.
2. Inspect the Wheel Speed Sensor for proper mounting.
3. Inspect the Wheel Speed Sensor harness and connector.
4. Inspect the Wheel Speed Sensor for excessive debris on the sensor.
Is the Left Front Wheel Speed Sensor damaged?
Yes
- Replace the Left Front Wheel Speed Sensor. Front.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.
No
- Go To 6
6. CHECK LEFT FRONT WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE
1. Inspect the Left Front wheel bearing, hub and Encoder for excessive runout, clearance or damage.
NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications.
Is the Left Front Wheel Bearing, Hub or Encoder Damaged?
Yes
- Replace the Hub and Wheel Bearing. Front Hub And Bearing - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.
No
- Go To 7
7. LEFT FRONT WHEEL SPEED SENSOR
1. Replace the Left Front Wheel Speed Sensor. Front.
2. Perform the ABS VERIFICATION TEST. ABS Verification Test
3. 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 met.
4. With the scan tool, read ABS DTCs.
Does the DTC remain active?
Yes
- Replace the Anti-Lock Brakes Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.
No
- Test Complete.