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With JF3/JF7 or JH6/JH7



DTC C0035 or C0040 (With JF3/JF7 or JH6/JH7)

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 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 Below 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 Below 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 or C0040 00
* The ignition is ON.
* Ignition voltage is greater than 9.5 volts.



C0035 5A or C0040 5A
* The ignition is ON.
* Ignition voltage is greater than 9.5 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

* An erratic signal output of the wheel speed sensor is detected.
* A short to ground, open/high resistance is detected on the wheel speed sensor signal circuit.
* A short to voltage, short to ground or an open/high resistance is detected on the low reference circuit.
* Wheel speed sensor power supply is less than 7.6 volts.
* A missing wheel speed sensor signal



Action Taken When the DTC Sets

* The EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS) and VSES for the duration of the ignition cycle.
* The electronic brake distribution (EBD) 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 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.



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:

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
Description and Operation

ABS Description and Operation (With JL4) (ABS Description and Operation (With RPO JL4))ABS Description and Operation (Without JL4) (ABS Description and Operation (Without RPO JL4))
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
With JF3/JF7

It is recommended 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 terminals of the appropriate sensor listed below and ground .

* LF Sensor circuit terminal 22
* RF Sensor circuit terminal 6


• 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 34
* RF Sensor circuit terminal 18


• 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 22
* RF Sensor circuit terminal 6


• 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 34
* RF Sensor circuit terminal 18


• 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 WSS.
7. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below.

* LF Sensor circuit terminals 22 at the EBCM harness connector, and terminal 1 at the WSS harness connector
* RF Sensor circuit terminals 6 at the EBCM harness connector, and terminal 1 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 terminals 34 at the EBCM harness connector, and terminal 2 at the WSS harness connector
* RF Sensor circuit terminals 18 at the EBCM harness connector, and terminal 2 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.



Circuit/System Testing
With JH6/JH7

It is recommended 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 terminals of the appropriate sensor listed below and ground .

* LF Sensor circuit terminal 16
* RF Sensor circuit terminal 27


• 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 15
* RF Sensor circuit terminal 26


• 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 16
* RF Sensor circuit terminal 27


• 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 15
* RF Sensor circuit terminal 26


• 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. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below.

* LF Sensor circuit terminals 16 at the EBCM harness connector, and terminal A at the WSS harness connector
* RF Sensor circuit terminals 27 at the EBCM harness connector, and terminal A 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.

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

* LF Sensor circuit terminals 15 at the EBCM harness connector, and terminal B at the WSS harness connector
* RF Sensor circuit terminals 26 at the EBCM harness connector, and terminal B 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.

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



Component Testing

1. Ignition OFF, disconnect the harness connector at the suspect wheel speed sensor.
2. Ignition On, test at the harness connector for 10-12 volts between the signal circuit terminal, and low reference circuit terminal.

• If not within the specified range, perform the Circuit/System Testing procedure.

3. Connect a jumper wire between the signal circuit terminal on the harness side, and to the wheel speed sensor signal circuit terminal on the WSS.
4. Connect a DMM between the low reference terminal at the WSS, and to the low reference terminal on the harness connector. Set up the DMM to measure mA using the DC scale.
5. Spin the wheel very slowly. Using the DMM MIN/MAX feature, test for 4-8 mA on the MIN capture, and 12-16 mA on the MAX capture. The sensor mA readings should toggle from high to low with in the specified range.

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

6. If all sensor circuits test normal, perform the Circuit/System Testing procedure.



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Front Wheel Speed Sensor Replacement (JD9, JF3, JF7) (Front Wheel Speed Sensor Replacement (JD9, JF3, JF7))Front Wheel Speed Sensor Replacement (JH6, JH7) (Front Wheel Speed Sensor Replacement (JH6, JH7))
* Control Module References for EBCM replacement, setup, and programming


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