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ECU Problems 200 1990

posted by  Art Benstein on  Fri Jul 24 08:12 CST 2009
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Agreed. Seems really weird to me, as it must to Art.

I tried some creative reading between the lines to come up with this. I'm hoping Art will post back and set me straight:

1. Diagnosed a bad fuel Injector.
It was running, but only on 3. Pulled plug on #4 injector, no change. Swapped #4 and #3, still misses, but now pulling #4 injector cable makes it die, pulling #3 injector plug offers no change.
2. Installed an injector with the wrong coil resistance. The car has 16 ohm injectors and I installed a 4 ohm injector.
Got an injector out of my turbo 700. Swapped in place of the clogged one.
3. Car wouldn't run!
only the turbo injector is opening now?
4.Installed the 4 ohm injector- car wouldn't run.
???
4a. Found that the injectors put out way to much fuel!
Pulled spark plug and found cylinder awash in fuel
5. Decided i'd blown the ECU with too small a load on the output transistor.
Expect to find short emitter-collector, holding all injectors open constantly
6. Removed the ECU and checked the output transistor to the fuel injectors. checked OK.
measured resistance pin 17 to 18 - open circuit with positive probe to 18.
7. Tried the ECU in another car.Wouldn't work! Too much fuel out of the injectors.
Other car also a 240?
8. Got another 0280 000 951 from the wrecking yard-$75.
T402 also looks not shorted? What unlikely coincidence could this be?
9. Plugged in the ECU. Same results.I should have checked the ECU in the other car before plugging it into the symptomatic car.
If it is a 240...
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.
agreed the temp reading is gonna be a swag, and if you condemn it, the reading better be an order of magnitude off to agree with the symptoms. The "engine speed voltage" is a 12V rectangular wave some tech writer found made his DVM show 8V.
--
Art Benstein near Baltimore

Police were called to a day care where a three-year-old was resisting a rest.





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