Checking speed sensor
Display group number 002
- Press keys 0, 0 and 2.
- Confirm entry with key Q.
There are always 4 display zones -arrows- in the measured value block. Decoding the individual values in display zones 1 to 4 can be read from the following tables.
| Read measured value block 2 → → 1 → 2 → 3 → 4 |
Indicated on display: (Vehicle stationary)
| Read measured value block 2 → 255 km/h 255 km/h 255 km/h 255 km/h |
Press C key for the next display group number entry.
If the → key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterwards to regain entry.
- The reading of measured value blocks in display group number 002 must be undertaken when driving off slowly. Then the ABS Control Module (w/EDL) -J104- will store the first usable voltage signals provided by the speed sensors and display these as a fixed value in the measured value block.
| Read measured value block | 2 → | Display group number: 002 | ||
| 3 km/h1) | 6 km/h1) | 2 km/h2) | 1 km/h2) | ← Indicated on display: (when driving off slowly) |
Wheel speed at right rear speed sensor
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Wheel speed at left rear speed sensor
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Wheel speed at right front speed sensor
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Wheel speed at left front speed sensor
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1) If the deviations in display zones 1 and 2 are greater than 6 km/h (approx. 3.75 mph), the following malfunctions may be present:
2) If the deviations in display zones 3 and 4 are greater than 2 km/h (approx. 1.25 mph), the following malfunctions may be present:
- Air gap between speed sensor and rotor may be too wide.
- Check that speed sensor is attached correctly to wheel bearing housing.
- Speed sensor or rotor exterior damaged.
- Change damaged component.