DTC Descriptors
DTC C0035 00 : Left Front Wheel Speed Sensor Circuit No Additional InformationDTC 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
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Left Front Sensor Signal | C0035 00 | C0035 00 | C0035 00 | C0035 0F, 18 |
Left Front Sensor Low Reference | C0035 00 | C0035 00 | C0035 00 | C0035 0F, 18 |
Right Front Sensor Signal | C0040 00 | C0040 00 | C0040 00 | C0040 0F, 18 |
Right Front Sensor Low Reference | C0040 00 | C0040 00 | C0040 00 | C0040 0F, 18 |
Left Rear Sensor Signal | C0045 00 | C0045 00 | C0045 00 | C0045 0F, 18 |
Left Rear Sensor Low Reference | C0045 00 | C0045 00 | C0045 00 | C0045 0F, 18 |
Right Rear Sensor Signal | C0050 00 | C0050 00 | C0050 00 | C0050 0F, 18 |
Right Rear Sensor Low Reference | C0050 00 | C0050 00 | C0050 00 | C0050 0F, 18 |
Circuit/System Description
The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and a ground through the chassis of the vehicle. As the wheel spins, the wheel speed sensor sends the EBCM 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 18
| • | The ignition is ON. |
| • | Ignition voltage is greater than 8 volts. |
| • | The brake pedal is not pressed. |
| • | No other wheel speed circuit DTCs are set. |
| • | At least two other wheel speeds are not 0 km/h. |
C0035-C0050 0F
| • | The ignition is ON. |
| • | Ignition voltage is greater than 8 volts. |
| • | The brake pedal is not pressed. |
| • | A DTC is not set for the other wheel speed circuit on the same axle. |
C0035-C0050 00
| • | The ignition is ON. |
| • | Ignition voltage is greater than 8 volts. |
Conditions for Setting the DTC
C0035-C0050 18
The code is set when the following conditions exist:
| • | One wheel speed is 0 km/h. |
| • | The remaining wheel speeds are greater than 8 km/h (5 mph). |
| • | The difference between the remaining wheel speeds is less than 11 km/h (7 mph) from each other. |
C0035-C0050 0F
If the EBCM detects a change in wheel speed that exceeds 20 km/h (12 mph) between two 10 millisecond wheel speed samples. If the condition occurs 3 times in 200 milliseconds, the code is set.
C0035-C0050 00
The code is set when either of the following conditions exist:
| • | An open or a short to ground is detected on the wheel speed sensor signal circuit by the EBCM. |
| • | A short to voltage is detected on the wheel speed sensor signal circuit by the EBCM. |
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | The EBCM disables the ABS/TCS for the duration of the ignition cycle. |
| • | The ABS indicator illuminates. |
| • | The Traction OFF indicator illuminates. |
| • | If the other wheel speed sensor on the same axle sets an additional DTC, the EBCM disables the DRP for the duration of the ignition cycle. |
| • | When the EBCM disables DRP, the red Brake warning indicator illuminates. |
Diagnostic Aids
C0035- 0050 18
Under the following conditions, 2 Wheel Speed Sensor Input is 0 and DTCs are set:
| • | The 2 suspect wheel speeds equal zero for 6 seconds. |
| • | The other wheel speeds are greater than 16 km/h (10 mph). |
| • | The other wheel speeds are within 11 km/h (7 mph) of each other. |
Diagnose each wheel speed sensor individually.
C0035-C0050 18, 0F, 00
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:
- 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).
- Test drive the vehicle over various road surfaces: bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds.
- If the DTC returns, replace the suspected wheel speed sensor or repair the wheel speed sensor wiring.
- Rinse the area thoroughly when completed.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
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
It is recommended that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors.
- Ignition OFF, disconnect the harness connector at the suspect wheel speed sensor.
- Ignition ON, test for ignition voltage between the voltage circuit terminal A and ground.
- Test for ignition voltage between the voltage circuit terminal A and the signal circuit terminal B.
- Disconnect the harness connector at the EBCM.
- Test for infinite resistance between the signal circuit terminal B and ground.
- If all circuits test normal, test or replace the wheel speed sensor.
| ⇒ | If not the specified value, test the voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If not the specified value, test the signal circuit for a short to ground. |
Component Testing
- Ignition OFF, disconnect the harness connector at the suspect wheel speed sensor. .
- Connect a 3A fused jumper wire between B+ and the wheel speed sensor voltage terminal A.
- Test for 4-8 mA on the low reading between the signal terminal B and ground when spinning the wheel very slow.
- Test for 11-16 mA on the high reading between the signal terminal 2 and ground when spinning the wheel very slow.
| ⇒ | If not within the specified range, replace the wheel speed sensor. |
| ⇒ | If not within the specified range, replace the wheel speed sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
Repair Verification
