C0050

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 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

As the wheel spins, the wheel speed sensor produces an 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 00
* The ignition is ON.
* Ignition voltage is greater than 9.5 V.

C0035-C0050 0F
* The ignition is ON.
* Ignition voltage is greater than 9.5 V.
* The brake pedal is not pressed.
* A DTC is not set for the other wheel speed circuit on the same axle.

C0035-C0050 18
* The ignition is ON.
* Ignition voltage is greater than 9.5 V.
* 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.

Conditions for Setting the DTC

C0035-C0050 00
* An open is detected on the wheel speed sensor signal circuit.
* A short to ground is detected on the wheel speed sensor signal circuit.
* 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 seconds 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 zero 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)/engine traction system for the duration of the ignition cycle.
* The dynamic rear proportion does not function optimally with multiple wheel speed faults.
* The ABS indicator turns ON.
* The engine traction system (ETS) indicator turns ON.
* An ECE 13 response may occur. Refer to ABS Description and Operation (Description and Operation) for complete description of ECE 13.

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, unless a scan tool is used to clear all codes.

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. 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 15 km/h (10 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 low reference circuit terminal of the appropriate sensor listed below and ground.

* Left front sensor circuit terminal 46
* Right front sensor circuit terminal 33
* Left rear sensor circuit terminal 37
* Right rear sensor circuit terminal 42

• If greater than the specified range, test the low reference 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 45
* Right front sensor circuit terminal 34
* Left rear sensor circuit terminal 36
* Right rear sensor circuit terminal 43

• If greater than the specified range, test the signal circuit for a short to voltage.

4. Ignition OFF, test for infinite resistance between the appropriate low reference terminal listed below and ground.

* Left front sensor circuit terminal 46
* Right front sensor circuit terminal 33
* Left rear sensor circuit terminal 37
* Right rear sensor circuit terminal 42

• If not the specified value, test the low reference circuit for a short to ground.

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

* Left front sensor circuit terminal 45
* Right front sensor circuit terminal 34
* Left rear sensor circuit terminal 36
* Right rear sensor circuit terminal 43

• If not the specified value, test the signal circuit for a short to ground.

6. Test for 1200-2700 ohm between the appropriate wheel speed sensor circuit terminals listed below:

* Left front sensor circuit terminal 45 and 46
* Right front sensor circuit terminal 33 and 34
* Left rear sensor circuit terminal 36 and 37
* Right rear sensor circuit terminal 42 and 43

• If not within the specified range, test the low reference and signal circuits for an open/high resistance. If the circuit tests normal, replace the wheel speed sensor.

7. If all circuits test normal, 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, setup, and programming