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Injector problem - ECU pins 9 and 18? 900 1992

posted by  ken944 on  Thu Jul 23 17:29 CST 2009
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last visit: Tue Sep 17 11:06 CST 2013
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Hi,

I'm trying to trace a no-start problem in a 1992 Volvo 940 Turbo, LH 2.4 ECU 0-280-000-937.

The problem is the fuel injectors aren't operating even though the spark plugs are firing and there is good fuel supply to the fuel rail.

Following the Bentley book's procedures for testing the pins at the ECU connector, I found there was no continuity between pins #9 and 18 (fuel injector ground). Bentley says 4 ohms should be present. There is continuity between pin 18 and the injectors themselves.

Two questions:
1. Does the above test (ie continuity) apply to the LH 2.4 Turbo ECU?
2. If so, is there any likely location for a fault in this circuit?

I'll note I've replaced the crankshaft position sensor and tested or swapped every component I can think of short of the ECU. I just want to settle a nagging doubt before moving to the next step of the ECU itself.

Thanks for any help.





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