406 Rev meter not working

Aug 26, 2004 1 Replies

Hi all,



I recently bought a 406 1998 1.9TD.



Symptoms:



-Rev-meter doesn't move when engine is running.



-The only time it moves is when I turn the key to start the engine (it rises to red-line momentarily and then drops back to zero)



My thouhts:



-Since the rev-meter moves during ignition, I presume that all the connections are ok.



-I've checked all the fuses



I've tried looking in Haynes, but it doesn't seem to mention the rev-meter anywhere in the normal sections of the book. Does anyone know where the rev-meter is connected to? is it the gearbox, or is it the ECU? I can't make any sense of the wiring diagrams in Haynes.



Thanks,



Tachometers on diesels used to normally take a feed from the alternator. Whether newer ones like yours use a crank sensor or the ecu I couldn't say but I'd check the alternator connections first.

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