Speedometer - Is Intermittent or Engine Stalls

91audi01

Group: 90

Number: 91-02

Date: March 29, 1991


Subject: Instrument panel printed circuit board solder connections, repairing

Model(s): 100/200 1989-1991 m.y.





Condition:

Speedometer is intermittent/inoperative (all 100/200, from 1989) or engine stalls intermittently on deceleration (100, from 1990 only) as the result of one or more loose/poor solder connections on the instrument panel printed circuit board.

Production:

Printed circuit board resoldered at supplier as of 9/90,
VIN 's: 44_LN 110 000
44_MN 016 000

Service solution:

^ while driving car, tap on instrument cluster and observe speedometer needle if speedometer needle jumps, a loose/poor solder connection may be the cause

Solder connection, repairing

^ obtain radio security code

^ disconnect battery ground strap

^ remove instrument cluster, see Repair Manual Group 90

^ carefully disassemble instrument cluster and remove printed circuit board (arrow)





^ using a magnifying glass, check upper speedometer connector terminals (arrows) for loose/broken solder connections





^ using a magnifying glass, check lower speedometer connector terminals (arrows) for loose/broken solder connections


CAUTION

DO NOT use a soldering iron larger than 30 Watts or damage to the printed circuit board will result.


^ resolder speedometer connector terminals as necessary


^ reassemble instrument cluster

^ reinstall instrument cluster into instrument panel

^ reconnect battery ground strap and reactivate (code) radio

^ check speedometer operation and/or engine performance (while driving vehicle, tap on instrument cluster and ensure speedometer needle does not jump)