Thread: ECM fried?
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Old 04-04-2021, 11:04 AM   #15
Cougar4
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Join Date: Jan 2004
Location: Anchorage, AK
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Looking over your option A diagram again makes me think when things were hooked up that way is when the ECU got damaged. I think the power tied to pin 86 and the pump on 85 allowed the relay to turn on, thus connecting the battery on pin 30 to connect to pin 87 and to the ECU connection. When the ECU turned on the transistor that caused a direct short and burned out the transistor.
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