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'94 940 runs poorly, stalls after warmup, returns 1-2-1 AMM error code. Now... won't crank. 900

posted by  montysano on  Mon Mar 24 13:32 CST 2014
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last visit: Thu May 29 16:46 CST 2014
[RELATED]

Hello all,

A couple of weeks ago, I posted about my wife's '94 940, which was running poorly, and would often stall, returning a 1-2-1 "no signal from AMM" code.

Picked up a used AMM (can't hurt to have a spare), installed it, same result. It would idle for a while, but would not rev, and after 5 minutes or so, dies and won't restart. Unplugging the AMM, it will sometimes start, sometimes not.

I was thinking it was a bad fuel filter... until now, however, when it won't even crank. Upon turning the ignition switch, I get a click, no crank, and all instrument lights go out. The battery is tested, fully charged, known good. Alternator is good.

Does the signal to the starter solenoid run through either the fuel pump relay or the radio suppression relay? Or could it be as simple as a bad connection at the solenoid?

Thanks,

Monty
--
Past: '79 245, '91 240, '88 245. Current: '90 245, '83 245, '95 940






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