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OBD2a to OBD1 P72 Jumper harness w/ missing pins

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Old 12-13-2010, 03:29 AM
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Default OBD2a to OBD1 P72 Jumper harness w/ missing pins

As of late, I've been fighting my car

1997 Civic DX
1993 B18C1 engine
OBD1 ECU w/ jumper harness to OBD2a Civic DX

I took the ECU out and traced the pinouts and noticed a couple wires not there. On connector A, I'm missing

11. EGR - Exhaust Gas Recirculation solenoid valve
22. ICM - Ignition ControlModule

Does this pose a problem?
Old 12-13-2010, 04:18 AM
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Default Re: OBD2a to OBD1 P72 Jumper harness w/ missing pins

you don't have egr, so thats not needed.

icm should be there though.
Old 12-14-2010, 01:02 AM
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Default Re: OBD2a to OBD1 P72 Jumper harness w/ missing pins

If you don't mind me asking, where should this be linked in the DX harness?

Also, thanks for the quick response.
Old 12-14-2010, 01:31 AM
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Default Re: OBD2a to OBD1 P72 Jumper harness w/ missing pins

A20 I believe

http://www.ff-squad.com/technet/wiring.obd2a.htm
Old 12-15-2010, 02:19 AM
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Default Re: OBD2a to OBD1 P72 Jumper harness w/ missing pins

Awesome! Thanks for the link. I need to do more research on FF-squad. That's the place I used to find the OBD1 P72 pinout.

To follow up, it looks as though loose wiring is my problem. The previous owner did a poor job. after placing the ECU back in and securing it, the codes went away without any troubleshooting. I'll keep the thread alive for a tad while I continue to fix/improve, just in case someone else is having similar issues. I'll post pics is requested.

Again, thanks again for the quick responses!
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