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A quick check on the ECU 200 1990

uid 18083's pic
posted by  lucid on  Fri Feb 25 08:00 CST 2011
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

The known 561 failure is in grounding the pump relay coil for starting and running.

A grounded jumper wire whose free end is back-probed into Fuel Relay harness socket — so it contacts the Blue-Green wire terminal end — can sub for the normal ECU ground. If the car now starts and runs with the ground jumper in place, the ECU is failing.

Note that it's not safe to run like this. The ECU normally doesn't let fuel get pumped without "permission" from the Ignition CU — as a safety feature in case of an accident.


--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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