TC/ABS 5.3

Wheel Sensor. Wrong Number of Teeth
Fault symptoms
ABS, brakes and central warning lamps are on. TCS OFF indicator lamp is on.
No ABS or TCS function.

Conditions
The respective wheel speed value is compared with a reference value (=the filtered mean value of all wheel speeds).
^ One wheel speed >25% higher than the reference speed for 20 seconds.
^ Two wheel speeds >6% higher than the reference speed for 80 seconds.
^ One wheel speed <6% lower than the reference speed for 20 seconds, or two wheel speeds for 10 seconds.
^ Continuous ABS modulation for more than 60 seconds.

Diagnostic help
^ The respective wheel speed sensor signal can be read using the diagnostic tool.
- Select "Read values".
- Select: "Wheel speed".
Current wheel speed in km/h (mph) is displayed.
Diagnostic procedure
1. Checking Wheel speeds





^ Contact TC/ABS.
^ Drive the car at a steady speed.
^ Read value Wheel Speed Front Left (TC/ABS control module).
^ Read value Wheel Speed Front Right (TC/ABS control module).
^ Read value Wheel Speed Rear Left (TC/ABS control module).
^ Read value Wheel Speed Rear Right (TC/ABS control module).

Go to Step 2

2. Checking Wheel speeds





^ The speed readings for all four wheels should be the same.

Is the function correct?

NO
Go To Step 3

YES
Go To Step 4

3. Selecting The Incorrect Wheel Speed

Wheel speed front left shows incorrect value C1371

Wheel speed front right shows incorrect value C1376

Wheel speed rear left shows incorrect value C1381

Wheel speed rear right shows incorrect value C1386

4. Final Check





^ Clear the diagnostic trouble codes in all systems.





^ Carry out a drive cycle
Drive the car at varying engine loads and engine rpm for five minutes.

^ Evaluate the drive cycle:





^ Check that the diagnostic trouble code has not recurred

Is the function correct?

YES
Go To Step 5

NO
Go To Step 6

5. Final Check
The steps taken to correct the fault were correct.
^ Diagnosis is complete.

6. Final Check
See Before changing a control module, refer to General Fault Diagnosis.
^ Diagnosis for this fault code is complete.