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C0040




DTC C0035-C0050

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0035 00
- Left Front Wheel Speed Sensor Circuit

DTC C0035 5A
- Left Front Wheel Speed Sensor Circuit Not Plausible

DTC C0040 00
- Right Front Wheel Speed Sensor Circuit

DTC C0040 5A
- Right Front Wheel Speed Sensor Circuit Not Plausible

DTC C0045 00
- Left Rear Wheel Speed Sensor Circuit

DTC C0045 5A
- Left Rear Wheel Speed Sensor Circuit Not Plausible

DTC C0050 00
- Right Rear Wheel Speed Sensor Circuit

DTC C0050 5A
- Right Rear Wheel Speed Sensor Circuit Not Plausible

Diagnostic Fault Information










Circuit/System Description

Each wheel speed sensor receives ignition voltage through the signal high circuit from the electronic brake control module (EBCM). Wheel speeds are detected by active wheel speed sensors and encoder rings. The magnetic encoder rings consists of multiple north and south pole pairs surrounding the outer circumference. When the encoder ring rotates and passes by the wheel speed sensor; it generates a sign wave in the wheel speed sensor. The sensor converts the signal to a digital square wave; the square wave values switch between 7mA (Low) and 14mA (High) DC current. As the wheel spins, the module uses the frequency of the square wave signal to calculate the wheel speed.

Conditions for Running the DTC

C0035 00, C0040 00, C0045 00, or C0050 00

Vehicle speed is greater than 15 km/h (9 MPH).

C0035 5A, C0040 5A, C0045 5A, or C0050 5A

Vehicle speed is greater than 50 km/h (31 MPH).

Conditions for Setting the DTC

C0035 00, C0040 00, C0045 00, or C0050 00

* A short to ground, or open/high resistance on the wheel speed sensor signal high circuit is detected for 0.2 seconds.

* A short to voltage, short to ground, or open/high resistance on the wheel speed sensor signal low circuit is detected for 0.2 seconds.

C0035 5A, C0040 5A, C0045 5A, or C0050 5A

* No wheel speed signal for 1 second.

* An invalid wheel speed sensor signal is detected for 10 seconds.

* A electrical magnetic interference with the wheel speed sensor harness.

* Difference between fastest and slowest wheel speed is greater than 5% for 20 seconds.

Action Taken When the DTC Sets

* The ABS indicator turns ON.

* The stability control indicator turns ON.

* The traction control Off indicator turns ON.

* The stability control Off indicator turns ON.

* The driver information center displays the Service StabiliTrak message.

* The electronic brake control module disables the antilock brake system, traction control, and stability control for the duration of the ignition cycle.

Conditions for Clearing the DTC

* When the condition for setting the DTC is no longer present.

* The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Note: During normal diagnostic and/or repair verification technicians may find that the ABS, Traction control and/or Stability control indicators may be ON with NO DTCs displayed by the electronic brake control module. Do not replace the electronic brake control module for this condition.

If the ABS, Traction control and/or Stability control indicators are ON with no DTCs set, perform the following steps:

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power, and wait 60 seconds.

2. Ignition ON, if the ABS, Traction Control and/or Stability control indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The electronic brake control module should request all indicators to turn OFF.

3. If indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.

4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the electronic brake control module should request all the indicators to turn OFF.

Diagnostic Aids

* Do not use a magnet to clean the encoder ring.

* Inspect the wheel hub bearing encoder ring for rust or corrosion.

* If two or more wheel speed sensors are inoperative, diagnose each wheel speed sensor individually.

* 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.

Reference Information

Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

ABS Description and Operation (Without F55) ABS Description and Operation (Without F55)ABS Description and Operation (With F55) ABS Description and Operation (With F55)

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Drive the vehicle in a straight line at a speed greater than 40 km/h (25 mph).

2. Verify all scan tool Wheel Speed Sensor parameters are within 1.6 km/h (1 mph) of each other.

• If any parameter is not within 1.6 km/h (1 mph) of each other.
Refer to Circuit/System Testing.

• If each parameter is within 1.6 km/h (1 mph) of each other.

3. All OK.

Circuit/System Testing

Note: If symptom code 5A is set, refer to the Diagnostic Fault Information table for possible mechanical faults or conditions.

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connectors at the appropriate B5 wheel speed sensor and the harness connector at the K17 electronic brake control module, ignition ON.

2. Test for less than 1 V between the K17 electronic brake control module harness connector terminals listed below and ground:

* B5LF left front wheel speed sensor - terminal 21 and terminal 34

* B5RF right front wheel speed sensor - terminal 6 and terminal 18

* B5LR left rear wheel speed sensor - terminal 20 and terminal 33

* B5RR right rear wheel speed sensor - terminal 19 and terminal 31

• If 1 V or greater
Repair the short to voltage on the circuit.

• If less than 1 V

3. Ignition OFF.

4. Test for infinite resistance between the K17 electronic brake control module harness connector terminals listed below and ground:

* B5LF left front wheel speed sensor - terminal 21 and terminal 34

* B5RF right front wheel speed sensor - terminal 6 and terminal 18

* B5LR left rear wheel speed sensor - terminal 20 and terminal 33

* B5RR right rear wheel speed sensor - terminal 19 and terminal 31

• If less than infinite resistance
Repair the short to ground on the circuit.

• If infinite resistance

5. Test for less than 2 ohms between the B5 wheel speed sensor harness connector terminal 1 and the K17 electronic brake control module harness connector terminal listed below:

* B5LF left front wheel speed sensor terminal 21

* B5RF right front wheel speed sensor terminal 18

* B5LR left rear wheel speed sensor terminal 33

* B5RR right rear wheel speed sensor terminal 19

• If 2 ohms or greater
Repair the open/high resistance in the circuit.

• If less than 2 ohms

6. Test for less than 2 ohms between the B5 wheel speed sensor harness connector terminal 2 and the K17 electronic brake control module harness connector terminal listed below:

* B5LF left front wheel speed sensor terminal 34

* B5RF right front wheel speed sensor terminal 6

* B5LR left rear wheel speed sensor terminal 20

* B5RR right rear wheel speed sensor terminal 31

• If 2 ohms or greater
Repair the open/high resistance in the circuit.

• If less than 2 ohms

7. Replace the B5 wheel speed sensor.

8. Verify the DTC does not set while operating the vehicle within Conditions for Running the DTC.

• If the DTC sets
Replace the K17 electronic brake control module.

• If the DTC does not set

9. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Front Wheel Speed Sensor Replacement Front Wheel Speed Sensor Replacement

* Rear Wheel Speed Sensor Replacement Rear Wheel Speed Sensor Replacement

* Control Module References Control Module References for electronic brake control module replacement, programming and setup

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