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Re: How to test ECU ?
Posted by Sjer (more from Sjer) on Sun, 13 Jul 2003 06:58:53
In Reply to: How to test ECU ?, saab9000turbo, Sat, 12 Jul 2003 16:30:02
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I agree you are going to have to spend more time with diagnostics and less time replacing parts. But from the sound of it, there is a good chance the problem is either an ignition problem or a fuel delivery problem. I don't think the engine would run on starting fluid if the ECU was bad.
Check for spark. That is the first thing I would test.
If ignition checks out, check to see you have power to the fuel pump while you crank. You can check this with a voltmeter at the fp fuse while someone else turns the engine over. If you have no power to the fuel pump, then the ECU/ECU grounds/ECU input signals are suspect. If you do have power to the fp, then maybe you have inadequate pressure at the fuel rail (fp regulator is suspect).
There was a guy recently who had no start that was caused by severed O2 sensor lines. His motor mounts were shot and the motor was bouncing around enough to take out the O2 sensor wiring!
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