Diagnostic Instructions

DTC Descriptors

DTC C0035 00 : Left Front Wheel Speed Sensor Circuit

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

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

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

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

Perform the prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Left Front Sensor Signal	C0035 00	C0035 00	C0035 00	C0035 0F, C0035 18
Left Front Sensor Low Reference	C0035 00	C0035 00	C0035 00	C0035 0F, C0035 18
Left Rear Sensor Signal	C0045 00	C0045 00	C0045 00	C0045 0F, C0045 18
Left Rear Sensor Low Reference	C0045 00	C0045 00	C0045 00	C0045 0F, C0045 18
Right Front Sensor Signal	C0040 00	C0040 00	C0040 00	C0040 0F, C0040 18
Right Front Sensor Low Reference	C0040 00	C0040 00	C0040 00	C0040 0F, C0040 18
Right Rear Sensor Signal	C0050 00	C0050 00	C0050 00	C0050 0F, C0050 18
Right Rear Sensor Low Reference	C0050 00	C0050 00	C0050 00	C0050 0F, C0050 18

Circuit/System Description

As the wheel spins, the wheel speed sensor produces an alternating current (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 18

C0035-C0050 0F

C0035-C0050 00

Conditions for Setting the DTC

C0035-C0050 18

The code is set when the following conditions exist:

C0035-C0050 0F

The code is set when both of the following conditions exist:

C0035-C0050 00

The code is set when either of the following conditions exist:

Action Taken When the DTC Sets

If equipped, the following actions occur:

Diagnostic Aids

C0035-0050 18

Under the following conditions, 2 wheel speed sensors input are 0 and DTCs are set:

Diagnose each wheel speed sensor individually.

C0035-C0050 18, 0F, 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 10 g of salt to 200 ml of water (2 teaspoons of salt to 8 fl oz of water).
2. Test drive the vehicle over various road surfaces: bumps, turns, etc., above 40 km/h (25 mph) for greater than 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

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 harness connector at the appropriate wheel speed sensor.
2. Ignition ON, test for less than 1 volt between the signal circuit terminal A and ground.

⇒	If not within the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.

3. Test for less than 1 volt between the low reference circuit terminal B and the signal circuit terminal A.

⇒	If not within the specified range, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.

4. Disconnect the harness connector at the EBCM.
5. Test for infinite resistance between the signal circuit terminal A and ground.

⇒	If not the specified value, test the signal circuit for a short to ground.

6. Test for less than 1 ohm of resistance between the signal circuit terminal A at the wheel speed connector and the appropriate terminal A1, A3, A5, or A7 at the EBCM connector.

⇒	If not within the specified range, test the signal circuit for an open or a high resistance.

7. Test for less than 1 ohm of resistance between the low reference circuit terminal B at the wheel speed sensor connector and the appropriate terminal A2, A4, A6, or A8 at the EBCM connector.

⇒	If not within the specified range, test the low reference circuit for an open or a high resistance.

8. If all circuits test normal, replace the wheel speed sensor.

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.

Repair Verification

Diagnostic Repair Verification