Antilock Brake System - Less than 3900 kg (8600 lb) GVW
DTC C0710
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC C0710 00
- Steering Position Signal
DTC C0710 5A
- Steering Position Signal Plausibility Failure
Diagnostic Fault Information
Circuit/System Description
The electronic brake control module (EBCM) supplies a 5 V reference and provides a low reference to the steering wheel angle sensor and the brake booster vacuum sensor. The EBCM monitors the signal circuit and the three phase circuits to determine the steering wheel position. The EBCM receives three signal inputs from the steering angle sensor. The Phase C Index Pulse signal is only High when the steering wheel is centered or within a few degrees of the straight ahead position. The 2 input signals Phase A and Phase B are approximately 90 degrees out of phase. Once calibrated, the EBCM dynamically interprets the relationship between the Phase A and Phase B inputs, and determines the position of the steering wheel and the direction of the steering wheel rotation.
Conditions for Running the DTC
* The ignition is ON.
* Ignition voltage is greater than 9 V.
Conditions for Setting the DTC
* Opens, short to ground, or short to voltage.
* The calculated steering angle from the steering angle sensor does not correlate with the steering angle calculated from the yaw rate.
Action Taken When the DTC Sets
* The EBCM disables the vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
* The driver information center displays the Service Stability System message.
* The antilock brake system (ABS) remains functional.
* The VSES Caution indicator turns ON.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Note: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.
If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps:
1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.
Diagnostic Aids
* Before any in-depth diagnostics are performed, be aware that DTC C0710 may set if the vehicle has been modified with; suspension lift/lowering kits, the incorrect indexing of the steering shaft to the steering gear or the wrong steering gear installed, or if other than stock size wheels and tires have been installed.
* Inspect for aftermarket devices which could affect the operation of the ABS. Refer to Checking Aftermarket Accessories Checking Aftermarket Accessories.
* During diagnosis, park the vehicle on a level surface.
* The vehicle should not pull in either direction while driving straight on a level surface.
* Verify the steering wheel angle sensor is installed correctly.
* Verify the steering wheel is properly installed with the alignment arrow on the steering wheel aligned to the mark on the steering shaft.
* Verify the steering shaft coupling to the steering gear is properly installed and aligned.
* Find out from the customer the conditions under which the DTC was set. This information will help to duplicate the failure.
* The snapshot function on the scan tool can help find an intermittent DTC.
Reference Information
Schematic Reference
Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
ABS Description and Operation ABS (Less than 3900 kg (8600 lb) GVW)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the scan tool Steering Wheel Position parameter corresponds to the actual steering wheel position as the steering wheel is turned through its entire range of motion.
• If the parameter does not correspond with the steering wheel position or the reading is erratic
Refer to Circuit/System Testing.
• If the parameter reading corresponds with the steering wheel position
3. Verify the scan tool Digital HWPS Index Pulse parameter cycles between Low and High as the steering wheel is centered and then turned through its entire range of motion.
• If the parameter does not cycle between Low and High as the steering wheel is turned
Refer to Circuit/System Testing.
• If the parameter cycles between Low and High as the steering wheel is turned
4. All OK
Circuit/System Testing
Note: If only DTC C0710 is set refer to Only DTC C0710 Set, if both DTC C0710 and C1100 are set, refer to Both DTC C0710 and C1100 Set.
Only DTC C0710 Set
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the steering angle sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 20 ohm between the low reference circuit terminal 2 and ground.
• If 20 ohm or greater
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for less than 2 ohm in the low reference circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the EBCM.
• If less than 20 ohm
3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for infinite resistance between the 5 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohm in the 5 V reference circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the EBCM.
• If greater than 5.2 V
1. Ignition OFF, disconnect the harness connector at the EBCM, ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the EBCM.
• If between 4.8-5.2 V
5. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and the signal circuit terminal 6.
• If less than 4.8 V
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for less than 2 ohm in the signal circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the EBCM.
• If greater than 5.2 V
1. Ignition OFF, disconnect the harness connector at the EBCM, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the EBCM.
• If between 4.8-5.2 V
6. Ignition OFF, disconnect the harness connector at the EBCM.
7. Test for infinite resistance between the signal circuit terminal 4 and ground.
• If less than infinite resistance
Repair the short to ground on the circuit.
• If infinite resistance
8. Connect the harness connector at the EBCM.
9. Ignition ON.
Note: When measuring voltage, the voltage values are based on a battery charge of 12.5 V and the steering wheel is in the center position.
10. Test for 6.8-11 V between the signal circuit terminals listed below and ground.
* Phase A terminal 3
* Phase B terminal 4
* Phase C terminal 5
• If less than 6.8 V
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohm in the signal circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the EBCM.
• If greater than 11 V
1. Ignition OFF, disconnect the harness connector at the EBCM, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the EBCM.
• If between 6.8-11 V
11. Test or replace the steering angle sensor.
Both DTC C0710 and C1100 Set
1. Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor and the steering angle sensor, ignition ON.
2. Test for 4.8-5.2 V between the 5 V reference circuit terminals listed below and ground.
* Terminal 3 at the brake booster vacuum sensor
* Terminal 1 at the steering angle sensor
• If less than 4.8 V
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for infinite resistance between the 5 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohm in the 5 V reference circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the EBCM.
• If greater than 5.2 V
1. Ignition OFF, disconnect the harness connector at the EBCM, ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the EBCM.
• If between 4.8-5.2 V
3. Test or replace the brake booster sensor or steering angle sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Steering Wheel Position Sensor Replacement Steering Wheel Position Sensor Replacement
* Power Brake Booster Vacuum Sensor Replacement Service and Repair
* Control Module References Control Module References for EBCM replacement, programming and setup