4000 - 4999: 4516

4516-FRONT LEFT/FRONT RIGHT SPEED SENSOR CORRELATION

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

- Set Condition:
When the Front Left/Right Wheel Speed Sensor (WSS) reading is different from the reading received from the Front Left Wheel Speed Sensor (WSS) at a vehicle speed above 40 km/h (25 mph). The Anti-Lock Brake Module compares WSS readings from side-to-side.





Diagnostic Test

1. CHECK FOR DTC 4516-FRONT LEFT/FRONT RIGHT SPEED SENSOR CORRELATION
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.
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.

With the scan tool, read DTCs.
Does the scan tool display: 4516-FRONT LEFT/FRONT RIGHT SPEED SENSOR CORRELATION active?

Yes

- Go To 3

No

- Go To 2

2. CHECK WHEEL SPEED SENSOR SIGNALS
Turn the ignition on.
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.

Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph).
Is the Front Left/Right WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior?

Yes

- Go To 3

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.
- Refer to the ABS-INTERMITTENT CONDITION TEST.

3. CHECK FOR IMPROPER RIGHT FRONT TIRE PRESSURE/MISMATCHED TIRES
Turn the ignition off.
Check and adjust the Front Left/Right Tire pressure.
Check and adjust all other tire pressures.
Inspect for mismatched tires on vehicle.
Is the Front Left/Right Tire improperly inflated or mismatched tires on vehicle?

Yes

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

No

- Go To 4

4. CHECK RIGHT FRONT WSS LOOSENESS, INSPECT B1, B2 CIRCUITS/TERMINALS FOR DAMAGE

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

Inspect the Anti-Lock Brake Module harness connector and Front Left/Right WSS harness connector
Inspect the Front Left/Right WSS for looseness, excessive corrosion and not properly fastened.
Inspect the Front Left/Right WSS Signal(-) and Front Left/Right WSS Supply(+) circuits between the Front Left/Right WSS and Anti-Lock Brake Module for damage.
Is the Front Left/Right WSS loose or any of the wiring/connectors/terminals damaged?

Yes

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

No

- Go To 5

5. CHECK RIGHT FRONT WHEEL SPEED SENSOR FOR DAMAGE
Remove the Front Left/Right Wheel Speed Sensor.
Inspect the Front Left/Right Wheel Speed Sensor face for damage.
Is the Front Left/Right Wheel Speed Sensor damaged?

Yes

- Replace sensor and hub assembly.
- Perform ABS VERIFICATION TEST. Verification Tests.

No

- Go To 6

6. CHECK RIGHT FRONT TONE WHEEL/BEARING FOR DAMAGE
Inspect the Front Left/Right Tone Wheel/Bearing for damage, missing teeth, cracks, corrosion or looseness.

NOTE: The Tone Wheel teeth should be perfectly square, not bent, or nicked.

Is the Front Left/Right Tone Wheel/Bearing damaged?

Yes

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

No

- Go To 7

7. RIGHT FRONT WHEEL SPEED SENSOR
Replace the Front Left/Right Wheel Speed Sensor.
Perform ABS VERIFICATION TEST. Verification Tests.
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.

With the scan tool, read ABS DTCs.
Did DTC 4516-FRONT LEFT/FRONT RIGHT SPEED SENSOR CORRELATION reset?

Yes

- Replace the Anti-Lock Brakes Module.
- Perform ABS VERIFICATION TEST. Verification Tests.

No

- Test Complete.