C0045
DTC C0035-C0050
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
DTC C0035 00
- Left Front Wheel Speed Sensor Circuit
DTC C0035 0F
- Left Front Wheel Speed Sensor Circuit Erratic Signal
DTC C0035 18
- Left Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum
DTC C0040 00
- Right Front Wheel Speed Sensor Circuit
DTC C0040 0F
- Right Front Wheel Speed Sensor Circuit Erratic Signal
DTC C0040 18
- Right Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum
DTC C0045 00
- Left Rear Wheel Speed Sensor Circuit
DTC C0045 0F
- Left Rear Wheel Speed Sensor Circuit Erratic Signal
DTC C0045 18
- Left Rear Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum
DTC C0050 00
- Right Rear Wheel Speed Sensor Circuit
DTC C0050 0F
- Right Rear Wheel Speed Sensor Circuit Erratic Signal
DTC C0050 18
- Right Rear Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum
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.
C0035-C0050 0F
* Ignition ON.
* The brake pedal is not pressed.
* A DTC is not set for the other wheel speed sensor on the same axle.
C0035-C0050 18
* Ignition ON.
* The brake pedal is not pressed.
* No other wheel speed sensor DTCs are set.
* At least 2 other wheel speeds are not 0 km/h.
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.
C0035-C0050 0F
The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 20 km/h (12 mph) or more in 0.01 second. The change must occur 3 times with no more than 0.2 second between occurrences.
C0035-C0050 18
* One wheel speed is 2 km/h (1.2 mph).
* The remaining wheel speeds are greater than 10 km/h (6.2 mph).
* The difference between the remaining wheel speeds is less than 8 km/h (5 mph) from each other for 180 seconds.
OR
* The 2 wheel speed sensor inputs are 0 and DTCs are set.
* The 2 suspect wheel speeds equal 0 for 6 seconds.
* The other wheel speeds are greater than 15 km/h (10 mph).
* The other wheel speeds are within 11 km/h (7 mph) of each other.
Action Taken When the DTC Sets
* The EBCM disables the antilock brake system (ABS) 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 setting the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 100 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 Views)
Description and Operation
ABS Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) 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 volt between the ignition voltage circuit terminal of the appropriate sensor listed below and ground.
* LF Sensor circuit terminal 46
* RF Sensor circuit terminal 34
* LR Sensor circuit terminal 36
* RR 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 volt between the signal circuit terminal of the appropriate sensor listed below and ground.
* LF Sensor circuit terminal 45
* RF Sensor circuit terminal 33
* LR Sensor circuit terminal 37
* RR 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 terminal of the appropriate sensor listed below and ground.
* LF Sensor circuit terminal 46
* RF Sensor circuit terminal 34
* LR Sensor circuit terminal 36
* RR 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.
* LF Sensor circuit terminal 45
* RF Sensor circuit terminal 33
* LR Sensor circuit terminal 37
* RR 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 WSS.
7. Ignition OFF, test for less than 2 ohms between the appropriate ignition voltage circuit terminals listed below.
* LF Sensor circuit terminal 46 at the EBCM harness connector and terminal A at the WSS harness connector.
* RF Sensor circuit terminal 34 at the EBCM harness connector and terminal A at the WSS harness connector.
* LR Sensor circuit terminal 36 at the EBCM harness connector and terminal A at the WSS harness connector.
* RR Sensor circuit terminal 43 at the EBCM harness connector and terminal A at the WSS 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 ohms between the appropriate signal circuit terminals listed below.
* LF Sensor circuit terminal 45 at the EBCM harness connector and terminal B at the WSS harness connector.
* RF Sensor circuit terminal 33 at the EBCM harness connector and terminal B at the WSS harness connector.
* LR Sensor circuit terminal 37 at the EBCM harness connector and terminal B at the WSS harness connector.
* RR Sensor circuit terminal 42 at the EBCM harness connector and terminal B at the WSS 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 (Programming and Relearning) for EBCM replacement, setup, and programming