With ABS 5.4

Wheel Sensor Front Left. Signal Incorrect

Fault symptoms
ABS warning light on. ABS not functioning.

Conditions
- Speed signal absent for more than 10 ms when road speed above 40 km/h.
- Speed signal faulty when road speed above 12 km/h.

Diagnostic help
- FL wheel speed sensor signal can be read using diagnostic tool.
- Select: "Read values".
- Select: " Wheel Speed Front Left".

The current wheel speed in km/h is displayed.

- With the front of the car raised off the ground, the diagnostic tool should show a reading of about 5 km/h when the FL wheel is rotated by hand at a speed of about one turn a second.

Diagnostic procedure
1. Checking Wheel Speed





^ Contact ABS





^ Drive the car at a steady speed.

Go to step 2

2. Checking Wheel Speed





^ Read value
Wheel Speed Front Left (ABS).

Is the displayed FL wheel speed correct?

NO
Go To Step 3

YES
Go To Step 6

3. Checking Mechanical Quantities





^ Check that the tire pressure, wheel size, wheel-bearing play and toothed wheel are OK.

Is the function correct?

YES
Go To Step 5

NO
Go To Step 4

4. Checking Mechanical Quantities

Rectify the fault.

When repair is complete
Go To Step 6

5. Checking The Toothed Wheel Air Gap





^ The air gap between the toothed wheel and the sensor should be 0.3 - 1.3 mm.

Is the function correct?

YES
Go To Step 6

NO
Go To Step 4

6. 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?

NO
Go To Step 7

YES
Go To Step 8

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

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