Mercedes-Benz A220 2020 Technical Service Bulletin # LI54-30_P-049068 Date: 100311

Instruments - Tachometer Fluctuates By Approx. 100rpm

Instrument cluster: Tachometer fluctuates

Topic number LI54.30-P-049068

Mercedes-Benz A220 2020 Page 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

Mercedes-Benz A220 2020 Page 388

Mercedes-Benz A220 2020 Page 389