For 1990-2009 cars

### 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: Steering Position Signal

### Circuit/System Description

The electronic brake control module (EBCM) receives a digital and an analog steering wheel position signal from one sensor. The EBCM uses the steering wheel position sensor (SWPS) signals to perform Vehicle Stability Enhancement System (VSES). The analog and digital data parameters on the scan tool normally range from +220° to -220°. With the steering and steering wheel centered, the analog data parameter on the scan tool should display near 0°. The digital data parameter will calibrate to 0° after each key cycle regardless of actual steering wheel position. The EBCM verifies the accuracy of the steering wheel position signal by correlating the digital and analog signals together.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

• | Vehicle speed is greater than 15 km/h (9 mph), the steering angle does not change more than 10 degrees in 20 seconds and the yaw rate is 8.6 degrees/sec or more.

• | The digital and analog steering wheel position signals do not correlate.

### Action Taken When the DTC Sets

• | The EBCM disables the VSES for the duration of the ignition cycle.

• | A DIC message and/or a warning indicator may be displayed.

### Conditions for Clearing the DTC

• | The condition for the DTC is no longer present and the DTC is cleared with a scan tool.

• | The EBCM automatically clears the history DTC when a current DTC is not detected in 50 consecutive drive cycles.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

ABS Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References

### Circuit/System Verification

Test drive the vehicle at a speed greater than 15 km/h (9 mph) and make several turns. The DTC should not reset.

### Circuit/System Testing

Important: It is recommend that the defective components be replaced, and not the complete brake master cylinder assembly.

1. Ignition OFF, disconnect the harness connector at the SWPS.
2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal 8 and ground.

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance.

3. Test for less than 1 ohm of resistance between the low reference circuit terminal 2 and ground.

⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.

4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 7 and ground.

⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, and the fuse is OK, replace the HVAC relay 87.

5. Test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.

⇒ | 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.

6. Test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and the signal terminal 6.

⇒ | If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.

7. Reconnect the SWPS.
8. Disconnect the EBCM harness connector.
9. Ignition OFF, test for infinite resistance between the signal circuit pin 30 and ground.

⇒ | If less than the specified range, test the signal circuit for a short to ground.

10. Ignition ON, test for an ignition voltage pulse between ground and the signal A circuit terminal 41 and signal B circuit terminal 9 while turning the steering wheel.

⇒ | If not the specified value, test the signal circuits for a short to voltage, short to ground or an open/high resistance. If the circuit tests normal, replace the SWPS.

11. Position the wheels straight and the steering wheel within 10 degrees of center.
12. Test for ignition voltage between the marker pulse signal circuit terminal 38 and ground.

⇒ | 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 SWPS.

13. Center the front wheels and steering wheel. Observe the scan tool Analog Steering Position Sensor data parameter for less than 180° or greater than -180°.
14. If not the specified value replace the SWPS.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming