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C0045




DTC C0035, C0040, C0045, or 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 06

-
Left Front Wheel Speed Sensor Circuit Low Voltage/Open

DTC C0035 0F

-
Left Front Wheel Speed Sensor Circuit Signal Erratic

DTC C0035 18

-
Left Front Wheel Speed Sensor Circuit Low Signal Amplitude

DTC C0035 5A

-
Left Front Wheel Speed Sensor Circuit Not Plausible

DTC C0040 06

-
Right Front Wheel Speed Sensor Circuit Low Voltage/Open

DTC C0040 0F

-
Right Front Wheel Speed Sensor Circuit Signal Erratic

DTC C0040 18

-
Right Front Wheel Speed Sensor Circuit Low Signal Amplitude

DTC C0040 5A

-
Right Front Wheel Speed Sensor Circuit Not Plausible

DTC C0045 06

-
Left Rear Wheel Speed Sensor Circuit Low Voltage/Open

DTC C0045 0F

-
Left Rear Wheel Speed Sensor Circuit Signal Erratic

DTC C0045 18

-
Left Rear Wheel Speed Sensor Circuit Low Signal Amplitude

DTC C0045 5A

-
Left Rear Wheel Speed Sensor Circuit Not Plausible

DTC C0050 06

-
Right Rear Wheel Speed Sensor Circuit Low Voltage/Open

DTC C0050 0F

-
Right Rear Wheel Speed Sensor Circuit Signal Erratic

DTC C0050 18

-
Right Rear Wheel Speed Sensor Circuit Low Signal Amplitude

DTC C0050 5A

-
Right Rear Wheel Speed Sensor Circuit Not Plausible

Diagnostic Fault Information










Circuit/System Description

The wheel speeds are detected by active wheel speed sensors and encoder rings. The encoder ring consists of permanent magnets. Each wheel speed sensor receives a 12 V reference voltage from the electronic brake control module (EBCM) and provides an alternating current square wave signal to the EBCM. 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 06, C0040 06, C0045 06, and C0050 06

Ignition ON

C0035 0F, C0040 0F, C0045 0F, and C0050 0F

* Ignition ON

* Vehicle speed is greater than 12.9 km/h (8 MPH)

C0035 18, C0040 18, C0045 18, and C0050 18

* Ignition ON

* Vehicle speed is greater than 6 km/h (3.7 MPH)

C0035 5A, C0040 5A, C0045 5A, and C0050 5A

* Ignition ON

* Vehicle speed is greater than 1.5 km/h (0.9 MPH)

Conditions for Setting the DTC

C0035 06, C0040 06, C0045 06, and C0050 06

A short to voltage or short to ground on the wheel speed sensor 12 V reference or low reference circuit is detected for 0.1 s.

C0035 0F, C0040 0F, C0045 0F, and C0050 0F

An erratic wheel speed sensor signal is detected.

C0035 18, C0040 18, C0045 18, and C0050 18

A missing wheel speed sensor signal is detected for 3-10 s.

C0035 5A, C0040 5A, C0045 5A, and C0050 5A

An open/high resistance on the wheel speed sensor 12 V reference or low reference circuit is detected for 0.75-3.75 s.

Action Taken When the DTC Sets

* The EBCM disables the ABS, traction control, stability control and hill start assist for the duration of the ignition cycle.

* The ABS indicator turns ON.

* The traction control/stability control-active indicator turns ON.

Conditions for Clearing the DTC

* A current DTC clears when the diagnostic runs and passes.

* The EBCM will turn OFF the indicator in the next ignition cycle.

Diagnostic Aids

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

* If 2 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 Sunshade - Left (DH6)

Description and Operation

ABS Description and Operation Description and Operation

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

Ignition ON, observe the scan tool Wheel Speed Sensor parameters. 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. Inspect the appropriate wheel speed sensor for contamination, physical damage and correct installation.

• If contamination, physical damage or incorrect installation is diagnosed

Repair or replace the wheel speed sensor or encoder ring.

• If the inspection is OK

2. Ignition OFF.

3. Disconnect the harness connector at the K17 Electronic Brake Control Module and at the appropriate B5 Wheel Speed Sensor, ignition ON.

4. Test for less than 0.3 V between the circuit terminal listed below and ground:

* Left front wheel speed sensor low reference circuit terminal 28 at the K17 Electronic Brake Control Module harness connector

* Right front wheel speed sensor low reference circuit terminal 4 at the K17 Electronic Brake Control Module harness connector

* Left rear wheel speed sensor low reference circuit terminal 35 at the K17 Electronic Brake Control Module harness connector

* Right rear wheel speed sensor low reference circuit terminal 10 at the K17 Electronic Brake Control Module harness connector

• If greater than 0.3 V

Repair the short to voltage on the circuit.

• If less than 0.3 V

5. Test for less than 0.3 V between the circuit terminal listed below and ground:

* Left front wheel speed sensor 12 V reference circuit terminal 27 at the K17 Electronic Brake Control Module harness connector

* Right front wheel speed sensor 12 V reference circuit terminal 3 at the K17 Electronic Brake Control Module harness connector

* Left rear wheel speed sensor 12 V reference circuit terminal 36 at the K17 Electronic Brake Control Module harness connector

* Right rear wheel speed sensor 12 V reference circuit terminal 11 at the K17 Electronic Brake Control Module harness connector

• If greater than 0.3 V

Repair the short to voltage on the circuit.

• If less than 0.3 V

6. Ignition OFF.

7. Test for infinite resistance between the circuit terminal listed below and ground:

* Left front wheel speed sensor low reference circuit terminal 28 at the K17 Electronic Brake Control Module harness connector

* Right front wheel speed sensor low reference circuit terminal 4 at the K17 Electronic Brake Control Module harness connector

* Left rear wheel speed sensor low reference circuit terminal 35 at the K17 Electronic Brake Control Module harness connector

* Right rear wheel speed sensor low reference circuit terminal 10 at the K17 Electronic Brake Control Module harness connector

• If less than infinite resistance

Repair the short to ground on the circuit.

• If infinite resistance

8. Test for infinite resistance between the circuit terminal listed below and ground:

* Left front wheel speed sensor 12 V reference circuit terminal 27 at the K17 Electronic Brake Control Module harness connector

* Right front wheel speed sensor 12 V reference circuit terminal 3 at the K17 Electronic Brake Control Module harness connector

* Left rear wheel speed sensor 12 V reference circuit terminal 36 at the K17 Electronic Brake Control Module harness connector

* Right rear wheel speed sensor 12 V reference circuit terminal 11 at the K17 Electronic Brake Control Module harness connector

• If less than infinite resistance

Repair the short to ground on the circuit.

• If infinite resistance

9. Test for infinite resistance between the circuit terminals listed below:

* Left front wheel speed sensor 12 V reference circuit terminal 27 and low reference circuit terminal 28 at the K17 Electronic Brake Control Module harness connector

* Right front wheel speed sensor 12 V reference circuit terminal 3 and low reference circuit terminal 4 at the K17 Electronic Brake Control Module harness connector

* Left rear wheel speed sensor 12 V reference circuit terminal 36 and low reference circuit terminal 35 at the K17 Electronic Brake Control Module harness connector

* Right rear wheel speed sensor 12 V reference circuit terminal 11 and low reference circuit terminal 10 at the K17 Electronic Brake Control Module harness connector

• If less than infinite resistance

Repair the short circuit.

• If infinite resistance

10. Connect the harness connector at the K17 Electronic Brake Control Module, ignition ON.

11. Test for greater than 11 V between the circuit terminals listed below and ground.

* Left front wheel speed sensor 12 V reference circuit terminal 1 at the B5 Wheel Speed Sensor harness connector

* Right front wheel speed sensor 12 V reference circuit terminal 1 at the B5 Wheel Speed Sensor harness connector

* Left rear wheel speed sensor 12 V reference circuit terminal 1 at the B5 Wheel Speed Sensor harness connector

* Right rear wheel speed sensor 12 V reference circuit terminal 1 at the B5 Wheel Speed Sensor harness connector

• If less than 11 V

1. Ignition OFF.

2. Disconnect the harness connector at the K17 Electronic Brake Control Module, test for less than 2 ohms in the 12 V reference circuit end to end.

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

• If less than 2 ohms, replace the K17 Electronic Brake Control Module.

• If greater than 11 V

12. Test for greater than 11 V between circuit terminals listed below.

* Left front wheel speed sensor 12 V reference circuit terminal 1 and low reference circuit terminal 2 at the B5 Wheel Speed Sensor harness connector

* Right front wheel speed sensor 12 V reference circuit terminal 1 and low reference circuit terminal 2 at the B5 Wheel Speed Sensor harness connector

* Left rear wheel speed sensor 12 V reference circuit terminal 1 and low reference circuit terminal 2 at the B5 Wheel Speed Sensor harness connector

* Right rear wheel speed sensor 12 V reference circuit terminal 1 and low reference circuit terminal 2 at the B5 Wheel Speed Sensor harness connector

• If less than 11 V

1. Ignition OFF.

2. Disconnect the harness connector at the K17 Electronic Brake Control Module, test for less than 2 ohms in the low reference circuit end to end.

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

• If less than 2 ohms, replace the K17 Electronic Brake Control Module.

• If greater than 11 V

13. Test the appropriate B5 Wheel Speed Sensor. Refer to Component Testing.

• If the sensor test fails

Replace the appropriate B5 Wheel Speed Sensor.

• If the sensor tests normal

14. Replace the K17 Electronic Brake Control Module.

Component Testing

Note:
Circuit/System Testing must be performed before Component Testing.

Dynamic Test

1. Ignition OFF, connect the harness connector at the appropriate B5 Wheel Speed Sensor.

2. Disconnect the harness connector at the K17 Electronic Brake Control Module.

3. Connect a fused jumper wire between B+ and the circuit terminal listed below:

* Left front wheel speed sensor 12 V reference circuit terminal 27 at the K17 Electronic Brake Control Module harness connector

* Right front wheel speed sensor 12 V reference circuit terminal 3 at the K17 Electronic Brake Control Module harness connector

* Left rear wheel speed sensor 12 V reference circuit terminal 36 at the K17 Electronic Brake Control Module harness connector

* Right rear wheel speed sensor 12 V reference circuit terminal 11 at the K17 Electronic Brake Control Module harness connector

4. Spin the wheel very slowly, test for current alternating between ca. 7 mA and ca. 14 mA between the circuit terminal listed below and ground:

* Left front wheel speed sensor low reference circuit terminal 28 at the K17 Electronic Brake Control Module harness connector

* Right front wheel speed sensor low reference circuit terminal 4 at the K17 Electronic Brake Control Module harness connector

* Left rear wheel speed sensor low reference circuit terminal 35 at the K17 Electronic Brake Control Module harness connector

* Right rear wheel speed sensor low reference circuit terminal 10 at the K17 Electronic Brake Control Module harness connector

• If not between 7-14 mA

Replace the appropriate B5 Wheel Speed Sensor.

• If between 7-14 mA

5. 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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