I have an obd1 ecu.

I checked the 3 grounds and 1 12v on connector one. What other input is required to turn on the ECU?

Thanks,
Nick

 

the fuel pump is turns on for a second, would it do that if the ecu was dead?

Nick

 

They always turn on for a second or two to prime. I have no idea how to test an ECU though.
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it sounded like *** and died when I gave it gas, but atleast it started.

I'm still not getting a CEL light

Nick

 

im telling you theres a dead circuit somewhere!!! ------- gay wires when they get old

 

I think there are some threads on pgmfi for making test benches. might even be in the library.

 

It only needs one power and ground to boot up.

I have come acrossed a few ECUs that just wont prime the fuel pump for some reason...not sure why it happens or what fixes yet. When I do...I have about 4 or 5 ECUs sitting here that will be fixed though finally

 

I can fix them. Pm me and I will tell ya the secret.

lol

actually check out the big main caps, they are the main filtering caps for the ecu, most of the time one of them has chewed through a trace. You can put a new one in and jump the pins.

 

OBD0 has two ground and *TWO* 12v to power it on... and seeing as though OBD0 to OBD1 conversion harnesses use all of the A plug, I would ASSume (without having checked a wiring diagram) that OBD1 would do the same.

The A plug is where things would have to power the ECU on. I did this to test them to make sure they didn't get a solid CEL when chipping ECUs for people. So that works as the "minimum requirements to power on an ECU".

 

OBD0 only needs one 12v and 1 ground when I boot them up on the test bench.