Normal Operation
WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
The wheel speed sensors are active sensors and generate a square wave signal that is sent to the ABS module. When the ignition is turned to the RUN position, the ABS module carries out a self-test to determine if the sensors are functional. Voltage and ground are supplied to the front wheel speed sensors from the ABS module along 2 circuits.
Wheel speed sensor DTCs are set in continuous memory and they automatically clear when a successful test drive is carried out. A successful test drive includes speeds above 32 km/h (20 mph) and at least one ABS stop.
DTC FAULT TRIGGER CONDITIONS
| DTC Description | Fault Trigger Conditions |
|---|---|
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These DTCs set in continuous memory when the vehicle speed exceeds 20 km/h (12 mph), and the ABS module detects an erratic wheel speed sensor acceleration. It can also be set by damaged tone rings, mismatched wheel and/or tire sizes or driving the vehicle on one or more deflated tires. |
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These DTCs set in continuous memory if the ABS module detects one of the wheel speed sensors has a missing signal or varies by 20% of the rest of the wheel speed sensors. There are no wheel speed sensor shorted or open circuit faults present in memory. |
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This DTC sets in continuous memory when the one wheel speed velocity differs from the rest by 25% or more. There are no wheel speed sensor faults set in memory. It can also be set by damaged tone rings, mismatched wheel and/or tire sizes or driving the vehicle on one or more deflated tires. |
This pinpoint test is intended to diagnose the following:
- Mismatched tire sizes
- Wheel speed sensor ring
- Wheel speed sensor
- ABS module