Mercedes Benz C 300 4MATIC # LI54-30_P-049068 Date: 100311 Instruments - Tachometer Fluctuates By Approx. 100rpm

 Mercedes Benz C 300 4MATIC # LI54-30_P-049068 Date: 100311
Instruments - Tachometer Fluctuates By Approx. 100rpm
Instrument cluster: Tachometer fluctuates
Topic number LI54.30-P-049068
  387
Version 1
Design group 54.30 Instrument cluster/display instruments/warning devices
Date 03-11-2010
Validity Model 204 with comfort multifunction steering wheel (code 442) up to VIN ...A 324554 / ...F 383728 / ...R 091855
Model 207 up to VIN ...F 014219
Model 212 up to VIN ...A 079696
Reason for change
Reason for block
Complaint:
Tachometer in instrument cluster (A1) fluctuates by approx. 100 rpm.
Note:
The complaint is observable primarily when idling.
Cause:
Dirt in the tachometer stepper motor in the instrument cluster (A1)
Remedy:
Check the engine speed on cold start and in warm-up with Xentry Diagnostics under Motor electronics (ME) control unit -> Actual values ->
Combustion engine. If the engine speed in the actual values is constant and the tachometer in the instrument cluster (A1) fluctuates,
remove/install/replace instrument cluster as per EPC (A1).
Symptoms
Work units
WIS-References
  388
  389
Validity