Pinpoint Test D : C1145, C1155, C1165, C1175: Notes
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Vehicle Dynamic Systems , for schematic and connector information.
Normal Operation and Fault Conditions
Active wheel speed sensors generate a square wave current signal that is sent to the ABS module. The wheel speed sensor circuitry connects to the ABS module through 2 wires and a connector at each wheel speed sensor. When the ignition is set to ON, the ABS module carries out a self-test by sending a reference voltage through the wheel speed sensors and their circuitry to determine if they are functional.
Battery voltage and ground are supplied to the active wheel speed sensors from the ABS module.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C1145 C1155 C1165 C1175 |
RF Wheel Speed Sensor Input Circuit Failure LF Wheel Speed Sensor Input Circuit Failure RR Wheel Speed Sensor Input Circuit Failure LR Wheel Speed Sensor Input Circuit Failure |
If during the ABS module on-demand self-test or during normal operation, if the ABS module detects an open, short to ground or voltage or a damaged wheel speed sensor input circuit, the appropriate DTC is set. These DTCs are usually set by a damaged sensor or a circuit fault. |
Possible Causes
- Wiring, terminals or connectors
- Wheel speed sensor
- Wheel speed sensor encoder
- ABS module