Quote:
Originally Posted by cabmando
I'm going to get under my car this evening and check that strap. I know I tightened it but I'm going to recheck. I was thinking there was nothing I unplugged that would effect the tach but there has to be some connector that sends signal back to the Motronic for it to process the signal. I'm going to go over the wiring schematics and recheck all my connectors. It has to be something simple.
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Think about it for a moment, on earlier cars with CDI ignition, the tach signal is developed IN the CDI unit. Same for DME, as the "CDI" is contained within the DME box. The signal is not driven by any sensor on the engine.
The tach pulses are sent from the DME on DME connector pins #4 and #11. #4 blk/violet wire, #11 blk wire. These wires run direct to the rear off the tach. Pull the DME connecter loose and check their continuity with a multimeter to the rear of the tach.