Diagnostic Instructions

DTC Descriptors

DTC C0035 00: Left Front Wheel Speed Sensor Circuit

DTC C0036 00: Left Front Wheel Speed Sensor Circuit Performance

DTC C0040 00: Right Front Wheel Speed Sensor Circuit

DTC C0041 00: Right Front Wheel Speed Sensor Circuit Performance

DTC C0045 00: Left Rear Wheel Speed Sensor Circuit

DTC C0046 00: Left Rear Wheel Speed Sensor Circuit Performance

DTC C0050 00: Right Rear Wheel Speed Sensor Circuit

DTC C0051 00: Right Rear Wheel Speed Sensor Circuit Performance

Diagnostic Fault Information

Circuit	Short to Ground	Open or High Resistance	Short to Voltage	Signal Performance
Left Front Sensor Signal	C0035 00, C0036 00	C0035 00, C0036 00	C0035 00, C0036 00	C0036 00
Left Front Sensor Low Reference	C0035 00, C0036 00	C0035 00, C0036 00	C0035 00, C0036 00	C0036 00
Right Front Sensor Signal	C0040 00, C0041 00	C0040 00, C0041 00	C0040 00, C0041 00	C0041 00
Right Front Sensor Low Reference	C0040 00, C0041 00	C0040 00, C0041 00	C0040 00, C0041 00	C0041 00
Left Rear Sensor Signal	C0045 00, C0046 00	C0045 00, C0046 00	C0045 00, C0046 00	C0046 00
Left Rear Sensor Low Reference	C0045 00, C0046 00	C0045 00, C0046 00	C0045 00, C0046 00	C0046 00
Right Rear Sensor Signal	C0050 00, C0051 00	C0050 00, C0051 00	C0050 00, C0051 00	C0051 00
Right Rear Sensor Low Reference	C0050 00, C0051 00	C0050 00, C0051 00	C0050 00, C0051 00	C0051 00

Component	Condition	DTCs
Left Front Wheel Speed Sensor	•  Physical damage     •  Debris on the wheel speed sensor or the tone ring     •  Loose or improperly mounted sensor     •  Loose or worn wheel bearing     •  Air gap between the wheel speed sensor and the tone ring too large	C0036 00
Right Front Wheel Speed Sensor	•  Physical damage     •  Debris on the wheel speed sensor or the tone ring     •  Loose or improperly mounted sensor     •  Loose or worn wheel bearing     •  Air gap between the wheel speed sensor and the tone ring too large	C0041 00
Left Rear Wheel Speed Sensor	•  Physical damage     •  Debris on the wheel speed sensor or the tone ring     •  Loose or improperly mounted sensor     •  Loose or worn wheel bearing     •  Air gap between the wheel speed sensor and the tone ring too large	C0046 00
Right Rear Wheel Speed Sensor	•  Physical damage     •  Debris on the wheel speed sensor or the tone ring     •  Loose or improperly mounted sensor     •  Loose or worn wheel bearing     •  Air gap between the wheel speed sensor and the tone ring too large	C0051 00

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 00, C0040 00, C0045 00, C0050 00

Ignition ON.

C0036 00, C0041 00, C0046 00, C0051 00

Conditions for Setting the DTC

C0035 00, C0040 00, C0045 00, C0050 00

A short to battery, short to ground, or an open/high resistance on the wheel speed sensor circuits.

C0036 00, C0041 00, C0046 00, C0051 00

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Diagnostic Aids

If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor individually.

C0035 00, C0040 00, C0045 00, C0050 00, C0051 00

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

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 speed 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 X1 harness connector at the EBCM.
2. Ignition ON, test for less than 1 volt between the voltage circuit terminal of the appropriate sensor listed below and ground.

•	LF Sensor circuit terminal 20

•	RF Sensor circuit terminal 4

•	LR Sensor circuit terminal 22

•	RR Sensor circuit terminal 2

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

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

•	LF Sensor circuit terminal 21

•	RF Sensor circuit terminal 5

•	LR Sensor circuit terminal 23

•	RR Sensor circuit terminal 3

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

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

•	LF Sensor circuit terminal 20

•	RF Sensor circuit terminal 4

•	LR Sensor circuit terminal 22

•	RR Sensor circuit terminal 2

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

5. Ignition OFF, test for infinite resistance between the following signal circuit terminal of the appropriate sensor listed below and ground.

•	LF Sensor circuit terminal 21

•	RF Sensor circuit terminal 5

•	LR Sensor circuit terminal 23

•	RR Sensor circuit terminal 3

⇒	If less than the specified value, test the signal circuit for a short to ground.

6. Ignition OFF, disconnect the harness connector at the appropriate WSS.
7. Ignition OFF, test for less than 2 ohms between the appropriate voltage circuit terminals listed below.

•	LF Sensor circuit terminal 20 at the EBCM harness connector, and terminal B at the WSS harness connector

•	RF Sensor circuit terminal 4 at the EBCM harness connector, and terminal B at the WSS harness connector

•	LR Sensor circuit terminal 22 at the EBCM harness connector, and terminal B at the WSS harness connector

•	RR Sensor circuit terminal 2 at the EBCM harness connector, and terminal B at the WSS harness connector

⇒	If greater than the specified range, test the voltage circuit for an open or high resistance.

8. Ignition OFF, test for less than 2 ohms between the appropriate signal circuit terminals listed below.

•	LF Sensor circuit terminal 21 at the EBCM harness connector, and terminal A at the WSS harness connector

•	RF Sensor circuit terminal 5 at the EBCM harness connector, and terminal A at the WSS harness connector

•	LR Sensor circuit terminal 23 at the EBCM harness connector, and terminal A at the WSS harness connector

•	RR Sensor circuit terminal 3 at the EBCM harness connector, and terminal A at the WSS harness connector

⇒	If greater than the specified range, test the signal circuit for an open or high resistance.

9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets replace the EBCM.

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.