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C0040




DTC C0035-C0050

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC C0035 02
- Left Front Wheel Speed Sensor Circuit Short to Ground

DTC C0035 05
- Left Front Wheel Speed Sensor Circuit Short to Battery or Open

DTC C0035 0F
- Left Front Wheel Speed Sensor Circuit Erratic

DTC C0035 18
- Left Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum

DTC C0040 02
- Right Front Wheel Speed Sensor Circuit Short to Ground

DTC C0040 05
- Right Front Wheel Speed Sensor Circuit Short to Battery or Open

DTC C0040 0F
- Right Front Wheel Speed Sensor Circuit Erratic

DTC C0040 18
- Right Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum

DTC C0045 02
- Left Rear Wheel Speed Sensor Circuit Short to Ground

DTC C0045 05
- Left Rear Wheel Speed Sensor Circuit Short to Battery or Open

DTC C0045 0F
- Left Rear Wheel Speed Sensor Circuit Erratic

DTC C0045 18
- Left Rear Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum

DTC C0050 02
- Right Rear Wheel Speed Sensor Circuit Short to Ground

DTC C0050 05
- Right Rear Wheel Speed Sensor Circuit Short to Battery or Open

DTC C0050 0F
- Right Rear Wheel Speed Sensor Circuit Erratic

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 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 02 and 05-C0050 02 and 05
* Ignition ON.
* Ignition voltage is greater than 10 volts.

C0035 18-C0050 18
* Ignition ON.
* Ignition voltage is greater than 10 volts.
* No other wheel speed circuit DTCs are set.
* The brake pedal is not pressed.
* Two or three other wheel speeds are greater than 0 km/h.

C0035 0F-C0050 0F
* Ignition ON.
* Ignition voltage is greater than 10 volts.
* The brake pedal is not pressed.
* A DTC is not set for the other wheel speed circuit on the same axle.

Conditions for Setting the DTC

C0035 02-C0050 02
* A short to ground, open/high resistance is detected on the wheel speed sensor signal circuit.
* Wheel speed sensor power supply is less than 7.6 volts.

C0035 05-C0050 05

A short to voltage, short to ground or an open/high resistance is detected on the signal circuit.

C0035 0F-C0050 0F
* An erratic signal output of the wheel speed sensor is detected 3 times in 200 milliseconds.
* The EBCM detects a change in wheel speed that exceeds 20 km/h (12 mph) between two 10 millisecond wheel speed samples. This must be detected 3 times in 200 milliseconds.
* A missing wheel speed sensor signal.

Actions Taken when the DTC Sets

* The EBCM disables the antilock brake system (ABS), traction control and StabiliTrak for the duration of the ignition cycle.
* A driver information center message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* 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.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

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.

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.
3. Rinse the area thoroughly when completed.

Reference Information
Schematic Reference

Antilock Brake System Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) 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

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 V between the ignition voltage circuit terminal of the appropriate sensor listed below and ground.

* Left front sensor circuit terminal 12
* Right front sensor circuit terminal 26
* Left rear sensor circuit terminal 42
* Right rear 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 V between the signal circuit terminal of the appropriate sensor listed below and ground.

* Left front sensor circuit terminal 13
* Right front sensor circuit terminal 27
* Left rear sensor circuit terminal 41
* Right rear sensor circuit terminal 44

• 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 circuit terminal of the appropriate sensor circuit listed below and ground.

* Left front sensor circuit terminal 12
* Right front sensor circuit terminal 26
* Left rear sensor circuit terminal 42
* Right rear sensor circuit terminal 43

• If less than the specified value, test the ignition voltage circuit for a short to ground.

5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor circuit listed below and ground.

* Left front sensor circuit terminal 13
* Right front sensor circuit terminal 27
* Left rear sensor circuit terminal 41
* Right rear sensor circuit terminal 44

• 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 wheel speed sensor.
7. Test for less than 2 ohm between the appropriate ignition voltage circuit terminals listed below.

* Left front sensor circuit terminal 12 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
* Right front sensor circuit terminal 26 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
* Left rear sensor circuit terminal 42 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
* Right rear sensor circuit terminal 43 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.

• If greater than the specified range, test the ignition voltage circuit for an open or high resistance.

8. Test for less than 2 ohm between the appropriate signal circuit terminals listed below.

* Left front sensor circuit terminal 13 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
* Right front sensor circuit terminal 27 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
* Left rear sensor circuit terminal 41 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
* Right rear sensor circuit terminal 44 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.

• If greater than the specified range, 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 Bearing and Hub Replacement (Front Suspension)
* Rear Wheel Bearing and Hub Replacement (Rear Suspension)
* Control Module References (Programming and Relearning) for EBCM replacement, programming and setup

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