Diagnostic Instructions

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 Signal

DTC C0035 18: Left Front Wheel Speed Sensor Circuit Signal Amplitude Less Than 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 Signal

DTC C0040 18: Right Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum

DTC C0045 02: Left Rear Wheel Speed Sensor Circuit Short to Ground

DTC C0045 05: Left Rear Wheel Speed Sensor Circuit Short to Battery or Open

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 02: Right Rear Wheel Speed Sensor Circuit Short to Ground

DTC C0050 05: Right Rear Wheel Speed Sensor Circuit Short to Battery or Open

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	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Left Front Wheel Speed Sensor 12-Volt Reference	C0035 02	C0035 05	C0035 05	C0035 0F, C0035 18
Left Front Wheel Speed Sensor Signal	C0035 02	C0035 05	C0035 05	C0035 0F, C0035 18
Right Front Wheel Speed Sensor 12-Volt Reference	C0040 02	C0040 05	C0040 05	C0040 0F, C0040 18
Right Front Wheel Speed Sensor Signal	C0040 02	C0040 05	C0040 05	C0040 0F, C0040 18
Left Rear Wheel Speed Sensor 12-Volt Reference	C0045 02	C0045 05	C0045 05	C0045 0F, C0045 18
Left Rear Wheel Speed Sensor Signal	C0045 02	C0045 05	C0045 05	C0045 0F, C0045 18
Right Rear Wheel Speed Sensor 12-Volt Reference	C0050 02	C0050 05	C0050 05	C0050 0F, C0050 18
Right Rear Wheel Speed Sensor Signal	C0050 02	C0050 05	C0050 05	C0050 0F, C0050 18

Component	Condition	DTCs
Left Front Wheel Speed Sensor	•  Physical damage     •  Debris on the wheel speed sensor or the encoder ring     •  Loose or improperly mounted sensor     •  Loose or worn wheel bearing     •  Air gap between the wheel speed sensor and the encoder ring too large	C0035 0F, C0035 18
Right Front Wheel Speed Sensor	•  Physical damage     •  Debris on the wheel speed sensor or the encoder ring     •  Loose or improperly mounted sensor     •  Loose or worn wheel bearing     •  Air gap between the wheel speed sensor and the encoder ring too large	C0040 0F, C0040 18
Left Rear Wheel Speed Sensor	•  Physical damage     •  Debris on the wheel speed sensor or the encoder ring     •  Loose or improperly mounted sensor     •  Loose or worn wheel bearing     •  Air gap between the wheel speed sensor and the encoder ring too large	C0045 0F, C0045 18
Right Rear Wheel Speed Sensor	•  Physical damage     •  Debris on the wheel speed sensor or the encoder ring     •  Loose or improperly mounted sensor     •  Loose or worn wheel bearing     •  Air gap between the wheel speed sensor and the encoder ring too large	C0050 0F, C0050 18

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 02 and 05-C0050 02 and 05

Ignition ON.

C0035 18-C0050 18

C0035 0F-C0050 0F

Conditions for Setting the DTC

C0035 02-C0050 02

A short to ground is detected on the wheel speed 12-volt reference or signal circuit.

C0035 05-C0050 05

A short to voltage, or an open is detected on 12-volt reference or the signal circuit.

C0035 0F-C0050 0F

Actions Taken when the DTC Sets

Conditions for Clearing the DTC

Diagnostic Aids

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

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 volt between the 12-volt reference circuit terminal of the appropriate sensor listed below and ground:

•	LF Sensor circuit terminal 28

•	RF Sensor circuit terminal 17

•	LR Sensor circuit terminal 4

•	RR Sensor circuit terminal 3

⇒	If greater than the specified value, test the 12-volt reference 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 29

•	RF Sensor circuit terminal 6

•	LR Sensor circuit terminal 5

•	RR Sensor circuit terminal 2

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

4. Ignition OFF, test for infinite resistance between the 12-volt reference terminal of the appropriate sensor listed below and ground:

•	LF Sensor circuit terminal 28

•	RF Sensor circuit terminal 17

•	LR Sensor circuit terminal 4

•	RR Sensor circuit terminal 3

⇒	If less than the specified value, test the 12-volt reference circuit for a short to ground.

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

•	LF Sensor circuit terminal 29

•	RF Sensor circuit terminal 6

•	LR Sensor circuit terminal 5

•	RR Sensor circuit terminal 2

⇒	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. Test for less than 2 ohms between the appropriate 12-volt reference circuit terminals listed below:

•	LF Sensor circuit terminals 28 at the EBCM harness connector, and terminal A at the WSS harness connector

•	RF Sensor circuit terminals 17 at the EBCM harness connector, and terminal A at the WSS harness connector

•	LR Sensor circuit terminals 4 at the EBCM harness connector, and terminal A at the WSS harness connector

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

⇒	If greater than the specified value, test the 12-volt reference circuit for an open or high resistance.

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

•	LF Sensor circuit terminals 29 at the EBCM harness connector, and terminal B at the WSS harness connector

•	RF Sensor circuit terminals 6 at the EBCM harness connector, and terminal B at the WSS harness connector

•	LR Sensor circuit terminals 5 at the EBCM harness connector, and terminal B at the WSS harness connector

•	RR Sensor circuit terminals 2 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.

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.