OBDI.5 to OBDII Engine bay harness fixes
Posted: Thu Aug 13, 2009 8:58 am
Well here is a short write up on how to modify the 96 OBDII harness to work in a 94 or 95 car, without changing the interior harness. This gives you the ability to tune a 94-95 car with DHP or HPTuners. Info needed on tuning PM me.
Some may not feel comfortable doing this but others can accomplish it easily.
There are three fixes you need to do to make the harness work on a 94 or 95 interior dash harness.
Re-route Tach signal wire from pin 9 on the ECM connector to pin C on the ICM connector. (IF YOU HAVE A TACH DASH) This is not necessary if you do not have or ever want a tach cluster.
Re-route Pin G5 on the driver's side body harness connector to Pin P on the passenger side body harness connector.
Tap pin F4 on the drives side body harness and connect that to the engine harness side of the wire that was on Pin P on the passenger side body harness, wire is left over from the previous step.
Then you can add some wires that tap off of the passenger side body harness connector to wire in your com port, I'll add pics of that part later.
The steps: (all relating pictures below the step being described)
Find Pin 9 on the clear ECM connector, WHITE WIRE.
Cut it 2 inches back from the connector just to leave some extra if you ever want to hook up a 0-5v tach setup.
Pull the wire back through the passenger side firewall connector.
Pull it back to where the wires for the ICM come out of the main harness.
Route it up to the ICM connector to determine length of wire needed.
Pull a connector from a un-used connector you have lying around, remember it has to be the same type of pin, TPS, Crank position, IAC, and a few others are all the same, I cut up a old crank position connector to get the pin out of it.
I cleaned it up trimmed back the wires, threaded the white wire through the ICM connector first at PIN C, and then put the pin on the wire and soldered it together.
I then pulled the wire back into place clipping the pin into the connector.
Cut the white wire on the driver's side body harness connector, PIN G5 AKA top row second from left, Looking at the back side of connector, as pictured, (natural wire curve aiming down)
Pull this wire back through the harness to the ABS ECM plug.
Stage this wire there for now.
Some may not feel comfortable doing this but others can accomplish it easily.
There are three fixes you need to do to make the harness work on a 94 or 95 interior dash harness.
Re-route Tach signal wire from pin 9 on the ECM connector to pin C on the ICM connector. (IF YOU HAVE A TACH DASH) This is not necessary if you do not have or ever want a tach cluster.
Re-route Pin G5 on the driver's side body harness connector to Pin P on the passenger side body harness connector.
Tap pin F4 on the drives side body harness and connect that to the engine harness side of the wire that was on Pin P on the passenger side body harness, wire is left over from the previous step.
Then you can add some wires that tap off of the passenger side body harness connector to wire in your com port, I'll add pics of that part later.
The steps: (all relating pictures below the step being described)
Find Pin 9 on the clear ECM connector, WHITE WIRE.
Cut it 2 inches back from the connector just to leave some extra if you ever want to hook up a 0-5v tach setup.
Pull the wire back through the passenger side firewall connector.
Pull it back to where the wires for the ICM come out of the main harness.
Route it up to the ICM connector to determine length of wire needed.
Pull a connector from a un-used connector you have lying around, remember it has to be the same type of pin, TPS, Crank position, IAC, and a few others are all the same, I cut up a old crank position connector to get the pin out of it.
I cleaned it up trimmed back the wires, threaded the white wire through the ICM connector first at PIN C, and then put the pin on the wire and soldered it together.
I then pulled the wire back into place clipping the pin into the connector.
Cut the white wire on the driver's side body harness connector, PIN G5 AKA top row second from left, Looking at the back side of connector, as pictured, (natural wire curve aiming down)
Pull this wire back through the harness to the ABS ECM plug.
Stage this wire there for now.