Diagnostic Instructions

DTC Descriptors

DTC C0035: Left Front Wheel Speed Sensor Circuit

DTC C0036: Left Front Wheel Speed Sensor Circuit Range Performance

DTC C0037: Left Front Wheel Speed Sensor Circuit Low

DTC C0040: Right Front Wheel Speed Sensor Circuit

DTC C0041: Right Front Wheel Speed Sensor Circuit Range Performance

DTC C0042: Right Front Wheel Speed Sensor Circuit Low

DTC C0045: Left Rear Wheel Speed Sensor Circuit

DTC C0046: Left Rear Wheel Speed Sensor Circuit Range Performance

DTC C0047: Left Rear Wheel Speed Sensor Circuit Low

DTC C0050: Right Rear Wheel Speed Sensor Circuit

DTC C0051: Right Rear Wheel Speed Sensor Circuit Range Performance

DTC C0052: Right Rear Wheel Speed Sensor Circuit Low

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Left Front Sensor Voltage Signal	C0035, C0037	C0035, C0037	C0035, C0037	C0036
Left Front Sensor Low Reference Signal	C0035, C0037	C0035, C0037	C0035, C0037	C0036
Right Front Sensor Voltage Signal	C0040, C0042	C0040, C0042	C0040, C0042	C0041
Right Front Sensor Low Reference Signal	C0040, C0042	C0040, C0042	C0040, C0042	C0041
Left Rear Sensor Voltage Signal	C0045, C0047	C0045, C0047	C0045, C0047	C0046
Left Rear Sensor Low Reference Signal	C0045, C0047	C0045, C0047	C0045, C0047	C0046
Right Rear Sensor Voltage Signal	C0050, C0052	C0050, C0052	C0050, C0052	C0051
Right Rear Sensor Low Reference Signal	C0050, C0052	C0050, C0052	C0050, C0052	C0051

Circuit Description

As the wheel spins, the wheel speed sensor (WSS) 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, C0040, C0045, or C0050

Ignition ON.

C0036, C0037, C0041, C0042, C0046, C0047, C0051, or C0052

Conditions for Setting the DTC

C0035, C0040, C0045, or C0050

C0036, C0041, C0046, or C0051

The EBCM detects 3 irratic readings from a wheel speed sensor.

C0037, C0042, C0047, or C0052

Action Taken When the DTC Sets

If equipped, the following actions occur:

Conditions for Clearing the DTC

Diagnostic Aids

C0035, C0037, C0040, C0042, C0045, C0047, C0050 or C0052

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 (9.9 ml) of salt to 354 ml (12 oz) 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.

C0036, C0041, C0046, or C0051

A possible cause of this DTC is electrical magnetic interference.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

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 on all sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).

Circuit/System Testing

Important: 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 signal circuit terminal of the appropriate sensor listed below and ground.

•	LF Sensor circuit terminal 28

•	RF Sensor circuit terminal 24

•	LR Sensor circuit terminal 12

•	RR Sensor circuit terminal 43

⇒	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 voltage signal circuit terminal of the appropriate sensor listed below and ground.

•	LF Sensor circuit terminal 27

•	RF Sensor circuit terminal 39

•	LR Sensor circuit terminal 13

•	RR Sensor circuit terminal 42

⇒	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 signal circuit terminal of the appropriate sensor listed below and ground.

•	LF Sensor circuit terminal 28

•	RF Sensor circuit terminal 24

•	LR Sensor circuit terminal 12

•	RR Sensor circuit terminal 43

⇒	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 voltage signal circuit terminal of the appropriate sensor listed below and ground.

•	LF Sensor circuit terminal 27

•	RF Sensor circuit terminal 39

•	LR Sensor circuit terminal 13

•	RR Sensor circuit terminal 42

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

•	LF Sensor circuit terminal 28 at the EBCM harness connector and terminal B at the WSS harness connector.

•	RF Sensor circuit terminal 24 at the EBCM harness connector and terminal B at the WSS harness connector.

•	LR Sensor circuit terminal 12 at the EBCM harness connector and terminal B at the WSS harness connector.

•	RR Sensor circuit terminal 43 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 voltage signal circuit terminals listed below.

•	LF Sensor circuit terminal 27 at the EBCM harness connector and terminal A at the WSS harness connector.

•	RF Sensor circuit terminal 39 at the EBCM harness connector and terminal A at the WSS harness connector.

•	LR Sensor circuit terminal 13 at the EBCM harness connector and terminal A at the WSS harness connector.

•	RR Sensor circuit terminal 42 at the EBCM harness connector and terminal A at the WSS harness connector.

⇒	If greater than the specified value, test the voltage 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 ECBM.

Component Testing

1. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
2. Test for 850-1350 ohms between the signal terminal A and the low reference signal terminal B. During the test, check for an intermittent circuit condition by gentle moving the wheel speed sensor pigtail harness.

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

3. Test for infinite resistance between each terminal and the steering knuckle. Reverse the test leads, test for infinite resistance between each terminal and the steering knuckle again.

⇒	If less than the specified value, replace the appropriate wheel speed sensor.

4. Spin the wheel while monitoring the voltage between the signal terminal A and the low reference terminal B. The voltage should be greater than 100 mV AC.

⇒	If less than the specified range, replace the wheel speed sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.