Take a look through these diagnostics and let me know if you have checked what is recommended.
2001 BMW X5 3.0i (E53) L6-3.0L (M54)
Wheel Speed Sensor
Vehicle Brakes and Traction Control Antilock Brakes / Traction Control Systems Testing and Inspection Component Tests and General Diagnostics Wheel Slip Control DSC5.7 (DSC 5.7 Dynamic Stability Control With (Off-Road Vehicle or All-Wheel Drive)) Switches, Sensors (Functional Tests) Wheel Speed Sensor
WHEEL SPEED SENSOR
Wheel Speed Sensor Transmits Implausible Signals Or No Signals
The control module for traction control (CU) monitors the signals of the wheel speed sensors (RDF) to ensure they are present and plausible.
Possible Cause(s) of Fault:
- Electromagnetic irradiation
- Wheel blocks briefly on driving off (e.G. Brake disk frozen solid when driving off on ice)
- Changed air gap between RDF head and impulse wheel
- Sensor head contaminated by metal filings
- Moisture has entered RDF
- Cable defective
- RDF defective
- CU defective
- Implausible speed signal
- Missing speed signal
- Visual inspection (cables and fitting): Check RDF and supply lines for correct installation and damage.
- Visual inspection (sensor head): Remove RDF and check whether the sensor head is damaged or soiled.
- Check of wiring: Check the supply and signal wires between RDF and CU.
The following checks only make sense if there are faults:
Caution: If there is a break in wiring to an RDF, the CU interrupts the power supply to the corresponding RDF. Prior to a check of the signal or voltage supply, there must therefore be a check of the electric wires.
- Check of the signal voltage:
Signal voltage OK: continue troubleshooting
Signal voltage not OK: replace RDF
- Check of the voltage supply:
Voltage supply OK: replace RDF
Voltage supply not OK: continue troubleshooting
- Check of the internal resistance in the CU:
Internal resistance OK: replace RDF
Internal resistance not OK: Replace CU
- The CU detects a disconnected RDF and interrupts the power supply
- CU replacement, see Service functions
Wednesday, September 9th, 2020 AT 6:08 PM