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what are the minium connections to start th ECU?

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what are the minium connections to start th ECU?

Old 02-01-2006, 08:59 PM
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Default what are the minium connections to start th ECU?

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
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Old 02-01-2006, 09:07 PM
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Default Re: what are the minium connections to start th ECU?

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

Nick
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Old 02-01-2006, 09:22 PM
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Default Re: what are the minium connections to start th ECU?

Originally Posted by Sinner
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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Old 02-01-2006, 10:02 PM
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Default Re: what are the minium connections to start th ECU?

it sounded like *** and died when I gave it gas, but atleast it started.

I'm still not getting a CEL light

Nick
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Old 02-01-2006, 11:03 PM
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Default Re: what are the minium connections to start th ECU?

im telling you theres a dead circuit somewhere!!! ------- gay wires when they get old
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Old 02-02-2006, 01:53 AM
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Default Re: what are the minium connections to start th ECU?

I think there are some threads on pgmfi for making test benches. might even be in the library.
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Old 02-03-2006, 03:36 PM
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Default Re: what are the minium connections to start th ECU?

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
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Old 02-04-2006, 06:49 PM
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Default Re: what are the minium connections to start th ECU?

Originally Posted by xenocron
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.
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Old 02-05-2006, 10:14 AM
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Default Re: what are the minium connections to start th ECU?

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".
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Old 02-05-2006, 01:04 PM
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Default Re: what are the minium connections to start th ECU?

Originally Posted by TurboEF9
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.
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