Normal Operation
The wheel speed sensor and sensor ring generates a square wave current signal to the ABS module that is proportional to the wheel speed. The ABS module compares the wheel speed inputs from all the wheel speed sensors to determine an impending wheel lockup. Incorrect/mismatched tire size can set these DTCs as well.
DTC DESCRIPTION
| DTC Description | Fault Trigger Condition |
|---|---|
|
When the vehicle speed exceeds 20 km/h (12 mph), if the ABS module detects a difference between wheel speed sensor signals, DTC C1222 will be set. DTC C1222 can also be set by damaged tone rings, mismatched wheel and/or tire sizes or driving the vehicle on one or more deflated tires. |
|
When the vehicle speed exceeds 20 km/h (12 mph), if the ABS module does not receive a signal from the wheel speed sensor, the appropriate DTC will be set. These DTCs can also be set by an excessive wheel speed sensor-to-tone ring air gap or a damaged tone ring. |
This pinpoint test is intended to diagnose the following:
- ABS module
- Wheel speed sensor ring
- Wheel speed sensor