C0045
DTC C0035-C0050
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 Descriptor
DTC C0035 00
- Left Front Wheel Speed Sensor Circuit
DTC C0040 00
- Right Front Wheel Speed Sensor Circuit
DTC C0045 00
- Left Rear Wheel Speed Sensor Circuit
DTC C0050 00
- Right Rear Wheel Speed Sensor Circuit
Diagnostic Fault Information
Circuit/System Description
The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.
Conditions for Running the DTC
C0035-C0050 00
* Ignition ON.
* The brake pedal is not pressed.
* A DTC is not set for the other wheel speed sensor on the same axle.
Conditions for Setting the DTC
C0035-C0050 00
A short to voltage, short to ground or an open/high resistance is detected on a wheel speed sensor circuit.
Action Taken When the DTC Sets
* The EBCM disables the antilock brake system (ABS) for the duration of the ignition cycle.
* A driver information center message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The condition for setting the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 50 consecutive drive cycles.
* ECE 13, the ABS indicator will remain on until a vehicle speed of 13 km/h (8 mph) or greater is achieved.
Diagnostic Aids
If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor individually.
If the customer comments that the ABS indicator is ON only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:
1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 8 fl oz of water (10 g of salt to 200 ml of water).
2. Test drive the vehicle over various road surfaces, bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds. Also rotate steering wheel from stop to stop for intermittent condition caused from open or chaffing of the front wheel speed sensor harness.
3. If the DTC returns, replace the suspected wheel speed sensor or repair the wheel speed sensor wiring.
4. Rinse the area thoroughly when completed.
Reference Information
Schematic Reference
Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
ABS Description and Operation Description and Operation
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
Ignition ON, observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 V between the ignition voltage circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 45
* Right front sensor circuit terminal 34
* Left rear sensor circuit terminal 36
* Right rear sensor circuit terminal 43
• If greater than the specified range, test the ignition voltage circuit for a short to voltage.
3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 46
* Right front sensor circuit terminal 33
* Left rear sensor circuit terminal 37
* Right rear sensor circuit terminal 42
• If greater than the specified range, test the signal circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the ignition voltage circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 45
* Right front sensor circuit terminal 34
* Left rear sensor circuit terminal 36
* Right rear sensor circuit terminal 43
• If less than the specified value, test the ignition voltage circuit for a short to ground.
5. Ignition OFF, test for infinite resistance between the following signal circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 46
* Right front sensor circuit terminal 33
* Left rear sensor circuit terminal 37
* Right rear sensor circuit terminal 42
• If less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Ignition OFF, test for less than 2 ohm between the appropriate ignition voltage circuit terminals listed below.
* Left front sensor circuit terminal 45 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
* Right front sensor circuit terminal 34 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
* Left rear sensor circuit terminal 36 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
* Right rear sensor circuit terminal 43 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
• If greater than the specified value, test the ignition voltage circuit for an open or high resistance.
8. Test for less than 2 ohm between the appropriate signal circuit terminals listed below.
* Left front sensor circuit terminal 46 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
* Right front sensor circuit terminal 33 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
* Left rear sensor circuit terminal 37 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
* Right rear sensor circuit terminal 42 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
• If greater than the specified value, test the signal circuit for an open or high resistance.
9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets, replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Front Wheel Speed Sensor Replacement Front Wheel Speed Sensor Replacement
* Rear Wheel Speed Sensor Replacement Rear Wheel Speed Sensor Replacement
* Control Module References Control Module References for EBCM replacement, setup, and programming