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C0050



DTC C0035-C0050

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 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

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 00-C0050 00

Ignition ON.


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



C0035 18-C0050 18
* Ignition ON.
* 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 00-C0050 00
* The EBCM detects a short to B+,short to ground or an open/high resistance on the wheel speed sensor signal circuit.
* The EBCM detects a short to voltage, short to short to ground or an open/high resistance on the wheel speed sensor low reference circuit.


C0035 0F-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 18-C0050 18



* One wheel speed is less than 20% of the maximum of the others for 5 seconds.
* At least one of the remaining wheel speeds are greater than 12.9 km/h (8 mph).
* There has been no wheel acceleration/deceleration exceeding 21.9 mph/sec.


OR

* The 2 wheel speed sensor inputs are less than 20% of the maximum of the others for 120 seconds.
* At least one of the remaining wheel speeds are greater than 12.9 km/h (8 mph).
* There has been no wheel acceleration/deceleration exceeding 21.9 mph/sec.



Action Taken When the DTC Sets

* The EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES).
* The ABS indicator illuminates.
* The Stability Control indicator illuminates.
* The driver information center (DIC) displays the Service Stability control message.



Conditions for Clearing

* The condition for setting the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.



Diagnostic Aids

* A damaged rear wheel speed sensor ring can cause failure type byte OF (Erratic Signal) to set.
* 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. If the DTC returns, replace the suspected wheel speed sensor or repair the wheel speed sensor wiring.
4. Rinse the area thoroughly when completed.



Reference Information
Schematic Reference

Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference

Component Connector End Views
Description and Operation

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

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

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

Important: It is recommend that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors.



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

* LF Sensor circuit terminal A2
* RF Sensor circuit terminal A4
* LR Sensor circuit terminal A6
* RR Sensor circuit terminal A8


• If greater than the specified value, test the low reference circuit for a short to voltage. If the circuit tests normal, test or replace the wheel speed sensor.

3. Test for less than 1 volt between the signal circuit terminal of the appropriate sensor listed below and ground.

* LF Sensor circuit terminal A1
* RF Sensor circuit terminal A3
* LR Sensor circuit terminal A5
* RR Sensor circuit terminal A7


• If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the wheel speed sensor.

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

* LF Sensor circuit terminal A2
* RF Sensor circuit terminal A4
* LR Sensor circuit terminal A6
* RR Sensor circuit terminal A8


• If less than the specified value, test the low reference circuit for a short to ground. If the circuit tests normal, test or replace the wheel speed sensor.

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

* LF Sensor circuit terminal A1
* RF Sensor circuit terminal A3
* LR Sensor circuit terminal A5
* RR Sensor circuit terminal A7


• If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the wheel speed sensor.

6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Ignition OFF, test for less than 2 ohms between the appropriate low reference circuit terminals listed below.

* LF Sensor circuit terminal A2 at the EBCM harness connector and terminal B at the WSS harness connector.
* RF Sensor circuit terminal A4 at the EBCM harness connector and terminal B at the WSS harness connector.
* LR Sensor circuit terminal A6 at the EBCM harness connector and terminal B at the WSS harness connector.
* RR Sensor circuit terminal A8 at the EBCM harness connector and terminal B at the WSS harness connector.


• If greater than the specified value, test the low reference circuit for an open or high resistance. If the circuit tests normal, test or replace the wheel speed sensor.

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

* LF Sensor circuit terminal A1 at the EBCM harness connector and terminal A at the WSS harness connector.
* RF Sensor circuit terminal A3 at the EBCM harness connector and terminal A at the WSS harness connector.
* LR Sensor circuit terminal A5 at the EBCM harness connector and terminal A at the WSS harness connector.
* RR Sensor circuit terminal A7 at the EBCM harness connector and terminal A at the WSS harness connector.


• If greater than the specified value, test the signal circuit for an open or high resistance. If the circuit tests normal, test or replace the wheel speed sensor.

9. If all circuits test normal, replace the EBCM.



Component Testing

1. Ignition OFF, disconnect the harness connector at the wheel speed sensor.
2. Connect a test lamp between B+ and the wheel speed sensor signal terminal A.
3. Connect a DMM between the low reference terminal B and ground. Set up the DMM to measure mA using the DC scale.
4. Spin the wheel very slowly. Using the DMM MIN/MAX feature, test for 4-8mA on the MIN capture and 12-16mA on the MAX capture.

• If not within the specified range, replace the wheel speed sensor.




Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Front Wheel Bearing and Hub Replacement
* Rear Wheel Bearing and Hub Replacement
* Control Module References for EBCM replacement, setup, and programming


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