For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C0710 00: Steering Position SignalDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Steering Wheel Position Sensor 5-Volt Reference Voltage | C0710 00 | C0710 00 | C0710 00 | -- |
Low Reference | C0710 00 | C0710 00 | C0710 00 | -- |
Steering Angle Sensor Position Signal A | C0710 00 | C0710 00 | C0710 00 | -- |
Steering Angle Sensor Position Signal B | C0710 00 | -- | C0710 00 | -- |
Circuit/System Description
The steering wheel position sensor (SWPS) supplies 2 analog inputs, Phase A and Phase B, to the electronic brake control module (EBCM). The 2 input signals are approximately 90 degrees out of phase. By interpreting the relationship between the 2 inputs, the EBCM can determine the position of the steering wheel and the direction of the steering wheel rotation.
Conditions for Running the DTC
Ignition voltage is greater than 9.0 volts.
Conditions for Setting the DTC
| • | Phase A and Phase B signal resistance values do not correlate to one another. |
| • | The calculated steering angle from the steering wheel position sensor does not correlate with the steering angle calculated from the yaw rate. |
Action Taken When the DTC Sets
| • | The EBCM turns OFF the 5-volt reference circuit, until the ignition is cycled. |
| • | The EBCM disables the vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | The driver information center (DIC) displays the Service Stability System message. |
| • | The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
| • | The ABS and Traction Control indicator turns ON. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
| • | If the steering angle sensor is disconnected, DTCs will set and the EBCM will not provide 5-volt reference. |
| • | During diagnosis, park the vehicle on a level surface. |
| • | The car should not pull in either direction while driving straight on a level surface. |
| • | The snapshot function on the scan tool can help find an intermittent DTC. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Position the steering wheel centered and the wheels facing straight-ahead.
- Engine running, observe the scan tool SWPS Signal A and SWPS Signal B parameters. Turning the steering wheel the readings should travel between 0 and 5 volts and their should be approximately a 2.5 volts difference between each signal.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the steering wheel position sensor.
- Test for less than 5 ohms between the low reference circuit terminal 2 and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
- Verify the scan tool SWPS Signal A and Signal B parameter is less than 0 volts.
- Install a 3A fused jumper wire at the 5-volt reference circuit terminal 1. Toggle the jumper wire between the 5-volt reference circuit terminal 1 and the signal A circuit terminal 5 and signal B circuit terminal 6. Verify the scan tool SWPS Signal A and SWPS Signal B parameter is greater than 4.75-volts.
- If all circuits test normal, test or replace the steering wheel position sensor.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM. |
| ⇒ | If greater than the specified range, test the appropriate signal circuit terminal for a short to voltage. If the circuit tests normal, replace the EBCM. |
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
