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DTC C0035-C0050

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

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

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Left Front Sensor Ignition Voltage

C0035 00

C0035 00

-

C0035 0F, C0035 18

Left Front Sensor Signal

C0035 00

C0035 00

C0035 00

C0035 0F, C0035 18

Right Front Sensor Ignition Voltage

C0040 00

C0040 00

-

C0040 0F, C0040 18

Right Front Sensor Signal

C0040 00

C0040 00

C0040 00

C0040 0F, C0040 18

Left Rear Sensor Ignition Voltage

C0045 00

C0045 00

-

C0045 0F, C0045 18

Left Rear Sensor Signal

C0045 00

C0045 00

C0045 00

C0045 0F, C0045 18

Right Rear Sensor Ignition Voltage

C0050 00

C0050 00

-

C0050 0F, C0050 18

Right Rear Sensor Signal

C0050 00

C0050 00

C0050 00

C0050 0F, C0050 18

Component

Condition

DTC Symptom Bytes

Wheel Speed Sensor

    • Physical damage
    • Debris on the wheel speed sensor or the encoder ring
    • Looseness
    • Air gap between the wheel speed sensor and the encoder ring too large
    • Water intrusion in the wiring harness

0F, 18

Circuit/System Description

The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.

Conditions for Running the DTC

C0035-C0050 00

Ignition ON.

C0035-C0050 0F

    • Ignition ON.
    • The brake pedal is not pressed.
    • A DTC is not set for the other wheel speed sensor on the same axle.

C0035-C0050 18

    • Ignition ON.
    • The brake pedal is not pressed.
    • No other wheel speed sensor DTCs are set.
    • At least 2 other wheel speeds are not 0 km/h.

Conditions for Setting the DTC

C0035-C0050 00

A short to voltage, short to ground or an open/high resistance is detected on a wheel speed sensor circuit.

C0035-C0050 0F

The EBCM detects a rapid variation in the wheel speed. The wheel speed changes by 20 km/h (12 mph) or more in 0.01 second. The change must occur 3 times with no more than 0.2 second between occurrences.

C0035-C0050 18

    • One wheel speed is 2 km/h (1.2 mph).
    • The remaining wheel speeds are greater than 10 km/h (6.2 mph).
    • The difference between the remaining wheel speeds is less than 8 km/h (5 mph) from each other for 180 seconds.

OR

    • The 2 wheel speed sensor inputs are 0 and DTCs are set.
    • The 2 suspect wheel speeds equal 0 for 6 seconds.
    • The other wheel speeds are greater than 40 km/h (25 mph).
    • The other wheel speeds are within 11 km/h (7 mph) of each other.

Action Taken When the DTC Sets

    • The EBCM disables the antilock brake system (ABS) for the duration of the ignition cycle.
    • A driver information centre message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

    • The condition for setting the DTC is no longer present.
    • The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
    • ECE 13, the ABS indicator will remain on until a vehicle speed of 13 km/h (8 mph) or greater is achieved.

Diagnostic Aids

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. 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. Also rotate steering wheel from stop to stop for intermittent condition caused from open or chaffing of the front wheel speed sensor harness.
  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

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, 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 40 km/h (25 MPH).

Circuit/System Testing

  1. Inspect for one tyre that has improper air pressure or improper size.
  2. If not all the same pressure, adjust all tyre pressures to specification. If not all the same tire size, replace the incorrect tire. Verify the DTC does not reset.
  3. Ignition OFF, disconnect the harness connector at the EBCM.
  4. Ignition ON, test for less than 1 V between the ignition voltage circuit terminal of the appropriate sensor listed below and ground.
  5. • B5 Left front sensor circuit terminal 45
    • B5 Right front sensor circuit terminal 34
    • B5 Left rear sensor circuit terminal 36
    • B5 Right rear sensor circuit terminal 43
    If greater than the specified range, test the ignition voltage circuit for a short to voltage.
  6. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.
  7. • B5 Left front sensor circuit terminal 46
    • B5 Right front sensor circuit terminal 33
    • B5 Left rear sensor circuit terminal 37
    • B5 Right rear sensor circuit terminal 42
    If greater than the specified range, test the signal circuit for a short to voltage.
  8. Ignition OFF, test for infinite resistance between the ignition voltage circuit terminal of the appropriate sensor listed below and ground.
  9. • B5 Left front sensor circuit terminal 45
    • B5 Right front sensor circuit terminal 34
    • B5 Left rear sensor circuit terminal 36
    • B5 Right rear sensor circuit terminal 43
    If less than the specified value, test the ignition voltage circuit for a short to ground.
  10. Ignition OFF, test for infinite resistance between the following signal circuit terminal of the appropriate sensor listed below and ground.
  11. • B5 Left front sensor circuit terminal 46
    • B5 Right front sensor circuit terminal 33
    • B5 Left rear sensor circuit terminal 37
    • B5 Right rear sensor circuit terminal 42
    If less than the specified value, test the signal circuit for a short to ground.
  12. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor.
  13. Ignition OFF, test for less than 2 Ω between the appropriate ignition voltage circuit terminals listed below.
  14. • Left front sensor circuit terminal 45 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
    • Right front sensor circuit terminal 34 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
    • Left rear sensor circuit terminal 36 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
    • Right rear sensor circuit terminal 43 at the EBCM harness connector and terminal B at the wheel speed sensor harness connector.
    If greater than the specified value, test the ignition voltage circuit for an open or high resistance.
  15. Test for less than 2 Ω between the appropriate signal circuit terminals listed below.
  16. • Left front sensor circuit terminal 46 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
    • Right front sensor circuit terminal 33 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
    • Left rear sensor circuit terminal 37 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
    • Right rear sensor circuit terminal 42 at the EBCM harness connector and terminal A at the wheel speed sensor harness connector.
    If greater than the specified value, test the signal circuit for an open or high resistance.
  17. If all circuits test normal, replace the appropriate B5 wheel speed sensor. If the DTC resets, replace the K17 EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Front Wheel Speed Sensor Replacement
    •  Rear Wheel Speed Sensor Replacement
    • Control Module References for EBCM replacement, programming and setup
   


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