Diagnostic Instructions
DTC Descriptors
DTC C0035 00: Left Front Wheel Speed Sensor Circuit
DTC C0035 5A: Left Front Wheel Speed Sensor Circuit Plausibility Failure
DTC C0040 00: Right Front Wheel Speed Sensor Circuit
DTC C0040 5A: Right Front Wheel Speed Sensor Circuit Plausibility Failure
DTC C0045 00: Left Rear Wheel Speed Sensor Circuit
DTC C0045 5A: Left Rear Wheel Speed Sensor Circuit Plausibility Failure
DTC C0050 00: Right Rear Wheel Speed Sensor Circuit
DTC C0050 5A: Right Rear Wheel Speed Sensor Circuit Plausibility Failure
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
Left Front Wheel Speed Sensor 12 Volt Reference
| C0035 00
| C0035 00
| --
| C0035 5A
|
Left Front Wheel Speed Sensor Signal
| C0035 00
| C0035 00
| C0035 00
| C0035 5A
|
Right Front Wheel Speed Sensor 12 Volt Reference
| C0040 00
| C0040 00
| --
| C0040 5A
|
Right Front Wheel Speed Sensor Signal
| C0040 00
| C0040 00
| C0040 00
| C0040 5A
|
Left Rear Wheel Speed Sensor 12 Volt Reference
| C0045 00
| C0045 00
| --
| C0045 5A
|
Left Rear Wheel Speed Sensor Signal
| C0045 00
| C0045 00
| C0045 00
| C0045 5A
|
Right Rear Wheel Speed Sensor 12 Volt Reference
| C0050 00
| C0050 00
| --
| C0050 5A
|
Right Rear Wheel Speed Sensor Signal
| C0050 00
| C0050 00
| C0050 00
| C0050 5A
|
Component
| Condition
| DTCs
|
Left Front Wheel Speed Sensor
|
| • | Debris on the wheel speed sensor or the encoder ring |
| • | Loose or improperly mounted sensor |
| • | Loose or worn wheel bearing |
| • | Air gap between the wheel speed sensor and the encoder ring too large |
| C0035 5A
|
Right Front Wheel Speed Sensor
|
| • | Debris on the wheel speed sensor or the encoder ring |
| • | Loose or improperly mounted sensor |
| • | Loose or worn wheel bearing |
| • | Air gap between the wheel speed sensor and the encoder ring too large |
| C0040 5A
|
Left Rear Wheel Speed Sensor
|
| • | Debris on the wheel speed sensor or the encoder ring |
| • | Loose or improperly mounted sensor |
| • | Loose or worn wheel bearing |
| • | Air gap between the wheel speed sensor and the encoder ring too large |
| C0045 5A
|
Right Rear Wheel Speed Sensor
|
| • | Debris on the wheel speed sensor or the encoder ring |
| • | Loose or improperly mounted sensor |
| • | Loose or worn wheel bearing |
| • | Air gap between the wheel speed sensor and the encoder ring too large |
| C0050 5A
|
Circuit/System Description
The wheel speed sensor (WSS) receives ignition voltage from the electronic brake control module (EBCM) and provides a DC square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel
speed.
Conditions for Running the DTC
C0035 00-C0050 00
| • | Ignition voltage is greater than 9.5 volts. |
C0035 5A-C0050 5A
| • | 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. |
Conditions for Setting the DTC
C0035 00-C0050 00
| • | A short to ground, or an open/high resistance is detected on the wheel speed sensor 12-volt reference circuit. |
| • | A short to voltage, short to ground or an open/high resistance is detected on the signal circuit. |
| • | Wheel speed sensor power supply is less than 7.6 volts. |
| • | A missing wheel speed sensor signal |
C0035 5A-C0050 5A
An erratic signal output of the wheel speed sensor is detected.
Actions Taken when the DTC Sets
| • | The EBCM disables the antilock brake system (ABS)/traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | The ABS indicator illuminates. |
| • | The Stabilitrak indicator illuminates. |
| • | The EBCM disables the voltage to the wheel speed sensor the fault is detected on. |
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. |
Diagnostic Aids
| • | Inspect the back of the wheel bearing on the encoder surface for metal debris that could cause an erratic reading with the sensor. Do not use a magnet to clean the debris, or damage to the encoder ring may occur. |
| • | If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor individually. |
| • | An ECE 13 response may be required, after repairs are made, and DTCs are cleared, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test, and the EBCM will turn off the ABS indicator. |
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.
- Rinse the area thoroughly when completed.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS 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.
| • | 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. |
- Test for less than 1 volt between the signal circuit terminal of the appropriate sensor listed below and ground.
| • | 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. |
- Ignition OFF, test for infinite resistance between the 12- volt reference terminal of the appropriate sensor circuit listed below and ground.
| • | 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. |
- Test for infinite resistance between the following signal circuit terminal of the appropriate sensor circuit listed below and 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. |
- 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.
| • | 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. |
- Test for less than 2 ohms between the appropriate signal circuit terminals listed below.
| • | 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. |
- 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 after completing the diagnostic procedure.
