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ECU Problems 200 1990

posted by  ArtB on  Fri Jul 24 03:53 CST 2009
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last visit: Mon Oct 6 16:09 CST 2014
[RELATED]

I need help with ECU Problems! Here is how I got into trouble.
1. Diagnosed a bad fuel Injector.
2. Installed an injector with the wrong coil resistance. The car has 16 ohm injectors and I installed a 4 ohm injector.
3. Car wouldn't run!
4.Installed the 4 ohm injector- car wouldn't run.
4a. Found that the injectors put out way to much fuel!
5. Decided i'd blown the ECU with too small a load on the output transistor.
6. Removed the ECU and checked the output transistor to the fuel injectors. checked OK.
7. Tried the ECU in another car.Wouldn't work! Too much fuel out of the injectors.
8. Got another 0280 000 951 from the wrecking yard-$75.
9. Plugged in the ECU. Same results.I should have checked the ECU in the other car before plugging it into the symptomatic car.
10. Checked all the ECU inputs per the Bently Manual. All Ok except the temp input read 2000 ohms which was high- should have been 1000 ohms. don't believe that should have been a problem.Also the engine speed voltage was 6.5 volts when cranking -not 8volts minimum.

Dare I plug in another ECU from the wrecking yard? After I check it in a known good car!!
Could the first one from the wrecking yard have been bad?
Would the local Volvo dealer have a machine to check the ECU inputs?
Suggestions solicited!!
Thanks,
Art





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