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

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.


C0035-C0050 0F
* The ignition is ON.
* 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.
* 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 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.


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 less than 20 percent 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 percent 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) for the duration of the ignition cycle.
* The dynamic rear proportion (DRP) does not function optimally.
* The ABS indicator turns ON.
* The Traction Control indicator turns ON.
* The driver information center (DIC) displays the Service Stability System message.



Conditions for Clearing

* 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.



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 13
* RF Sensor circuit terminal 27
* LR Sensor circuit terminal 41
* RR Sensor circuit terminal 44


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

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

* LF Sensor circuit terminal 12
* RF Sensor circuit terminal 26
* LR Sensor circuit terminal 42
* RR Sensor circuit terminal 43


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

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

* LF Sensor circuit terminal 13
* RF Sensor circuit terminal 27
* LR Sensor circuit terminal 41
* RR Sensor circuit terminal 44


• 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 terminals of the appropriate sensor listed below and ground.

* LF Sensor circuit terminal 12
* RF Sensor circuit terminal 26
* LR Sensor circuit terminal 42
* RR Sensor circuit terminal 43


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



Component Testing

1. Ignition OFF, disconnect the harness connector at the suspect wheel speed sensor.
2. Connect a 3A fused jumper wire between B+ and the wheel speed sensor signal terminal A.
3. Test for 4-8 mA on the low reading between the low reference terminal B and ground when spinning the wheel very slow.

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

4. Test for 11-16 mA on the high reading between the low reference terminal B and ground when spinning the wheel very slow.

• 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