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 Descriptors
DTC C0035 00 : Left Front Wheel Speed Sensor CircuitDTC 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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Left Front Wheel Speed Sensor Signal | C0035 00 | C0035 00 | C0035 00 | C0035 0F, C0035 18 |
Left Front Wheel Speed Sensor Low Reference | C0035 00 | C0035 00 | C0035 00 | C0035 0F, C0035 18 |
Left Rear Wheel Speed Sensor Signal | C0045 00 | C0045 00 | C0045 00 | C0045 0F, C0045 18 |
Left Rear Wheel Speed Sensor Low Reference | C0045 00 | C0045 00 | C0045 00 | C0045 0F, C0045 18 |
Right Front Wheel Speed Sensor Signal | C0040 00 | C0040 00 | C0040 00 | C0040 0F, C0040 18 |
Right Front Wheel Speed Sensor Low Reference | C0040 00 | C0040 00 | C0040 00 | C0040 0F, C0040 18 |
Right Rear Wheel Speed Sensor Signal | C0050 00 | C0050 00 | C0050 00 | C0050 0F, C0050 18 |
Right Rear Wheel Speed Sensor Low Reference | C0050 00 | C0050 00 | C0050 00 | C0050 0F, C0050 18 |
Circuit/System Description
As the wheel spins, the wheel speed sensor produces an alternating current (AC) signal. The electronic brake control module (EBCM) uses the frequency of the AC 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 sensor. |
C0035-C0050 0F
The code is set when both of the following conditions exist:
| • | The EBCM detects a change in wheel speed that exceeds 20 km/h (12 mph) between two 10 millisecond wheel speed samples. |
| • | The condition occurs 3 times in 200 milliseconds. |
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. |
Conditions for Clearing the DTC
| • | A current DTC clears when the diagnostic runs and passes. |
| • | A history DTC clears after 100 consecutive ignition cycles, if no failures are reported by this diagnostic. |
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | The EBCM disables the antilock brake system (ABS) and the traction control system (TCS) for the duration of the ignition cycle. |
| • | The ABS indicator turns ON. |
| • | The traction control off indicator turns ON. |
| • | If the other wheel speed sensor on the same axle sets an additional DTC, the EBCM disables the dynamic rear proportioning (DRP) for the duration of the ignition cycle. |
| • | When the EBCM disables DRP, the red brake warning indicator turns ON. |
Diagnostic Aids
C0035-C0050 18
Under the following conditions, 2 wheel speed sensors input are 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 10 g of salt to 200 ml of water (2 teaspoons of salt to 8 fl oz 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
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for Scan Tool Information
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
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition ON, test for less than 1 volt between the 12-volt reference circuit terminal of the appropriate sensor listed below and ground.
- Test for less than 1 volt between the signal circuit terminal of the appropriate sensor listed below and ground.
- Ignition OFF, test for infinite resistance between the 12- volt reference terminal of the appropriate sensor circuit listed below and ground.
- Test for infinite resistance between the following signal circuit terminal of the appropriate sensor circuit listed below and ground.
- Ignition OFF, disconnect the harness connector at the appropriate WSS.
- Test for less than 2 ohms between the appropriate 12-volt reference circuit terminals listed below.
- Test for less than 2 ohms between the appropriate signal circuit terminals listed below.
- If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets replace the EBCM.
| • | LF Sensor circuit terminal 21 |
| • | RF Sensor circuit terminal 18 |
| • | LR Sensor circuit terminal 33 |
| • | RR Sensor circuit terminal 19 |
| ⇒ | If greater than the specified range, test the low reference circuit for a short to voltage. |
| • | LF Sensor circuit terminal 34 |
| • | RF Sensor circuit terminal 6 |
| • | LR Sensor circuit terminal 20 |
| • | RR Sensor circuit terminal 31 |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. |
| • | LF Sensor circuit terminal 21 |
| • | RF Sensor circuit terminal 18 |
| • | LR Sensor circuit terminal 33 |
| • | RR Sensor circuit terminal 19 |
| ⇒ | If less than the specified value, test the 12-volt reference circuit for a short to ground. |
| • | LF Sensor circuit terminal 34 |
| • | RF Sensor circuit terminal 6 |
| • | LR Sensor circuit terminal 20 |
| • | RR Sensor circuit terminal 31 |
| ⇒ | If less than the specified value, test the signal circuit for a short to ground. |
| • | LF Sensor circuit terminal 21 at the EBCM harness connector, and terminal 1 at the WSS harness connector |
| • | RF Sensor circuit terminal 18 at the EBCM harness connector, and terminal 1 at the WSS harness connector |
| • | LR Sensor circuit terminal 33 at the EBCM harness connector, and terminal 1 at the WSS harness connector |
| • | RR Sensor circuit terminal 19 at the EBCM harness connector, and terminal 1 at the WSS harness connector |
| ⇒ | If greater than the specified range, test the 12-volt reference circuit for an open or high resistance. |
| • | LF Sensor circuit terminal 34 at the EBCM harness connector, and terminal 2 at the WSS harness connector |
| • | RF Sensor circuit terminal 6 at the EBCM harness connector, and terminal 2 at the WSS harness connector |
| • | LR Sensor circuit terminal 20 at the EBCM harness connector, and terminal 2 at the WSS harness connector |
| • | RR Sensor circuit terminal 31 at the EBCM harness connector, and terminal 2 at the WSS harness connector |
| ⇒ | If greater than the specified range, test the signal circuit for an open or high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
