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C0050




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 Low Voltage/Open

DTC C0035 0F
- Left Front Wheel Speed Sensor Circuit Signal Erratic

DTC C0035 18
- Left Front Wheel Speed Sensor Circuit Signal Low Signal Amplitude

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

DTC C0040 06
- Right Front Wheel Speed Sensor Low Voltage/Open

DTC C0040 0F
- Right Front Wheel Speed Sensor Circuit Signal Erratic

DTC C0040 18
- Right Front Wheel Speed Sensor Circuit Signal Low Signal Amplitude

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

DTC C0045 06
- Left Rear Wheel Speed Sensor Low Voltage/Open

DTC C0045 0F
- Left Rear Wheel Speed Sensor Circuit Signal Erratic

DTC C0045 18
- Left Rear Wheel Speed Sensor Circuit Signal Low Signal Amplitude

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

DTC C0050 06
- Right Rear Wheel Speed Sensor Low Voltage/Open

DTC C0050 0F
- Right Rear Wheel Speed Sensor Circuit Signal Erratic

DTC C0050 18
- Right Rear Wheel Speed Sensor Circuit Signal Low Signal Amplitude

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

Diagnostic Fault Information










Circuit/System Description

The wheel speeds are detected by wheel speed sensors and encoder rings. The encoder ring consists of permanent magnets. Each wheel speed sensor receives 12 V reference signal from the electronic brake control module and provides an alternating current square wave signal to the brake control module. As the wheel spins, the electronic brake control module uses the frequency of the square wave signal to calculate the wheel speed.

Conditions for Running the DTC

C0035-C0050 06

* The ignition is ON.

* Ignition voltage is greater than 8 V.

C0035-C0050 0F

* The ignition is ON.

* Ignition voltage is greater than 8 V.

C0035-C0050 18

* The ignition is ON.

* Ignition voltage is greater than 8 V.

* No other wheel speed circuit DTCs are set.

* At least two other wheel speed circuits are not 0 km/h (0 mph).

C0035-C0050 5A

* The ignition is ON.

* Ignition voltage is greater than 8 V.

* The vehicle speed is greater than 20 km/h (12 mph).

Conditions for Setting the DTC

C0035-C0050 06

* An open is detected on the wheel speed sensor 12 V reference or low reference circuit.

* A short to ground is detected on the wheel speed sensor 12 V reference circuit.

* A short to voltage is detected on the wheel speed sensor low reference circuit.

C0035-C0050 0F

The electronic brake control module detects a rapid variation in the wheel speed. The wheel speed changes 20 km/h (12 mph) or more in 0.007 seconds. The change must occur 56 times with no more than 0.07 seconds between occurrences.

C0035-C0050 18

* One wheel speed is less than 2 km/h (1.2 mph).

* The remaining wheel speeds are greater than 10 km/h (6.2 mph) for 0.154 seconds.

* The difference between the remaining wheel speeds is less than 4 km/h (2.5 mph) from each other.

OR

* The two wheel speed is less than 2 km/h (1.2 mph).

* The other wheel speeds are greater than 10 km/h (6.2 mph) for 20 seconds.

* The difference between the remaining wheel speeds is less than 4 km/h (2.5 mph) from each other.

C0035-C0050 5A

An erratic signal output of the wheel speed sensor is detected.

Action Taken When the DTC Sets

* The ABS indicator turns ON.

* The electronic brake distribution does not function optimally with multiple wheel speed faults.

* The traction/stability control indicator turns ON, if equipped with electronic stability control.

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

Conditions for Clearing the DTC

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

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

Diagnostic Aids

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

* 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 Sunshade - Left

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 Programming and Relearning 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 4 km/h (2.5 mph) of each other.

• If any parameter is not within 4 km/h (2.5 mph) of each other
Refer to Circuit/System Testing.

• If each parameter is within 4 km/h (2.5 mph) of each other

3. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor and disconnect 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:

* Terminal 36 and terminal 37 for the B5LF left front wheel speed sensor

* Terminal 26 and terminal 27 for the B5RF right front wheel speed sensor

* Terminal 29 and terminal 30 for the B5LR left rear wheel speed sensor

* Terminal 33 and terminal 34 for the B5RR right rear wheel speed sensor

• 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:

* Terminal 36 and terminal 37 for the B5LF left front wheel speed sensor

* Terminal 26 and terminal 27 for the B5RF right front wheel speed sensor

* Terminal 29 and terminal 30 for the B5LR left rear wheel speed sensor

* Terminal 33 and terminal 34 for the B5RR right rear wheel speed sensor

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

• If infinite resistance

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

* Terminal 37 for the B5LF left front wheel speed sensor

* Terminal 26 for the B5RF right front wheel speed sensor

* Terminal 30 for the B5LR left rear wheel speed sensor

* Terminal 33 for the B5RR right rear wheel speed sensor

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

• If less than 2 omhs

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

* Terminal 36 for the B5LF left front wheel speed sensor

* Terminal 27 for the B5RF right front wheel speed sensor

* Terminal 29 for the B5LR left rear wheel speed sensor

* Terminal 34 for the B5RR right rear wheel speed sensor

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

• If less than 2 omhs

7. Replace the B5 wheel speed sensor.

8. Operate the vehicle under the conditions for setting the DTC, the DTC should not set.

• 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 (Disc Brake) Rear Wheel Speed Sensor Replacement (Disc Brake)

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

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