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Diagnosing FI ECT failure 900

posted by  Volvo945 on  Mon Dec 26 08:31 CST 2011
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last visit: Sat Oct 12 15:05 CST 2013
[RELATED]

My '94 944T has started running poorly on cold start. The motor starts normally but revs to 2,000 rpm right off the bat. If it does settle down, it hunts around 750 rpm but sounds like it wants to die.

Cleaned the throttle body and ruled out the TPS, so my attention has turned to the ECT.

As per the FAQ, I'm testing voltage and resistance at the ECU. The ambient temp was 46F (~10C). My voltage was 2.75V which seems right in line with the spec.

The resistance was 1,800-2,000 ohms which would appear to be too low (I would figure around 5k to be the target). But would a lower resistance cause this problem? I would guess the opposite.

Anxious to solve this....

thanks

--
'94 945t; '95 854 base; '05 S80 2.5T






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