C0035
DTC C0035-C0050
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 C0035 00
- Left Front Wheel Speed Sensor Circuit No Additional Information
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 No Additional Information
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 No Additional Information
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 No Additional Information
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 signal 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
The ignition voltage is greater than 9.5 volts.
C0035-C0050 0F
* The ignition voltage is greater than 9.5 volts.
* The brake pedal is not pressed.
* A DTC is not set for the other wheel speed sensor on the same axle.
C0035-C0050 18
* The ignition voltage is greater than 9.5 volts.
* 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
An open, short to ground, or a short to voltage is detected on the wheel speed sensor signal 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) Control System for the duration of the ignition cycle.
* ABS indicator illuminates
* Driver information center (DIC) displays the ABS FAULT message.
* If both rear wheel speed sensor DTCs are set, the dynamic rear proportioning (DRP) is disabled and the Brake Warning Indicator illuminates.
Conditions for Clearing the DTC
* The condition for setting the DTC is no longer present.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
* 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
Description and Operation
ABS Description and Operation (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 for scan tool information
Circuit/System Verification
With scan tool installed drive the vehicle in a straight line at a speed greater than 10 km/h (6 mph), all wheel speed sensors should read the same speed.
Circuit/System Testing
It is recommended that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors.
1. Ignition OFF, disconnect the harness connector at the suspect wheel speed sensor.
2. Ignition ON, test for ignition voltage between the signal circuit terminal A and ground.
• If not the specified value, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the EBCM.
3. Test for ignition voltage between the signal circuit terminal A and the low reference circuit terminal B.
• If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
4. Disconnect the harness connector at the EBCM.
5. Test for infinite resistance between the low reference circuit terminal B and ground.
• If not the specified value, test the low reference circuit for a short to ground.
6. If all circuits test normal, test or replace the wheel speed sensor.
Component Testing
1. Ignition OFF, disconnect the harness connector at the suspect wheel speed sensor.
2. Connect a 3A fused jumper wire between B+ and the wheel speed sensor signal terminal A.
3. Test for 4-8 mA on the low reading between the low reference terminal B and ground when spinning the wheel very slow.
• If not within the specified range, replace the wheel speed sensor.
4. Test for 11-16 mA on the high reading between the low reference terminal B and ground when spinning the wheel very slow.
• If not within the specified range, replace the wheel speed sensor.
Repair Instructions
Perform the Diagnostic Repair Verification 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 for EBCM replacement, setup, and programming