Circuit Description
As the wheels spin, each wheel speed sensor produces a digital square wave signal. The electronic brake control module (EBCM) uses the frequency of these signals to calculate each wheel speed.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The vehicle speed is between 22 km/h (14 mph) and 110 km/h (69 mph). |
| • | No brake application or deceleration is detected. |
| • | No wheel slip is detected. |
| • | No turning maneuvers are detected. |
Conditions for Setting the DTC
The average front wheel speed differs from the rear wheel speed by at least 20% four 4 seconds.
Action Taken When the DTC Sets
| • | The EBCM disables the ABS/TCS/DRP. |
| • | The ABS Fault message is displayed. |
| • | The traction fault message is displayed. |
| • | The brake warning indicator turns ON. |
Conditions for Clearing the DTC
The Conditions for Setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Diagnostic Aids
Operating the vehicle with a tire that has very low air pressure may set this DTC.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | |
2 | Inspect all of the tires on the vehicle to ensure that all of the tires are of equal size. Did you find and correct the condition? | Go to Step 4 | Go to Step 3 |
3 | Inspect the wheel speed sensors and tone rings for damage, incorrect application, or incorrect installation. Did you find and correct the condition? | Go to Step 4 | Go to Diagnostic Aids |
4 |
Does the DTC reset? | Go to Step 2 | System OK |
