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Injector problem - ECU pins 9 and 18? 900 1992

uid 27's pic
posted by  Art Benstein on  Fri Jul 24 08:32 CST 2009
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Ken,

That voltage you see fluctuating on pin 1 is OK. Here's what a very similar signal from the ICU looks like on a scope, so you can see why anyone's digital meter is going to give varied responses, just like the guy got when he measured it for the Volvo book:



I recall looking at both 16 and 17, 17 being the one that goes to ECU-1, and if there was any difference (bottom trace), it may have been the duty cycle and amplitude. Anyway, the ECU just needs the repetition to time the injectors and keep the pumps running. If the pumps continue to run throughout cranking, the signal at pin 1 is doing the job.

You could connect a test light between injector common (ECU-18) and battery positive, and see the pulses to the injectors just like having a noid light.
--
Art Benstein near Baltimore

I fired my masseuse today. She just rubbed me the wrong way.





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