7mgte Wiring harness question

supraheelfan · 04-06-2012, 07:34 PM

Is there anyway to swap out my 87 ecu and harness with an ecu and wiring harness from a 91? The car is an 87.

cre · 04-06-2012, 07:52 PM

Um.... why? There's no significant difference in power and the redline will be lower.

The dash harness is different too so that will need to be altered or replaced as well. CPS uses a different connector so you'll either need a '89+ CPS or you'll need to modify yours. I don't think there are any other big surprises.

supraheelfan · 04-07-2012, 06:34 PM

The only harness I have found in 3 months is a 91 and wanted to see if it was possible. The 89+ cps connectors would have which color plugs? yellow or grey or whatever color they make them?

cre · 04-07-2012, 07:14 PM

I believe the plug on the 89+ harness is just black. There is no pigtail on the CPS side, the connector is built into the CPS housing. You could cut the end off of the '91 harness and wire in the end from the '87 harness.

Is there a reason your harness can't be rebuilt? Toyota does still sell many of the replacement connectors for it. It is a lot of work, but I don't know how bad it is... It may end up being just as much work to convert and swap a later model harness.

supraheelfan · 04-09-2012, 05:23 PM

I did not know Toyota sold replacement connectors. Thanks. We are going to try to rebuild the old one.

cre · 04-09-2012, 06:36 PM

Check on availability of any that are significantly damaged. Some are discontinued. Some you will find are compatible with other vehicles even though they are not list as such... For example I believe the '89+ N/A ECU connectors are compatible with earlier years, just the color is different.

04-06-2012, 07:34 PM	#1
supraheelfan 3" Exhaust Join Date: Feb 2011 Location: Wilmington, NC Posts: 178	7mgte Wiring harness question Is there anyway to swap out my 87 ecu and harness with an ecu and wiring harness from a 91? The car is an 87.

04-06-2012, 07:52 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Um.... why? There's no significant difference in power and the redline will be lower. The dash harness is different too so that will need to be altered or replaced as well. CPS uses a different connector so you'll either need a '89+ CPS or you'll need to modify yours. I don't think there are any other big surprises. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-07-2012, 07:14 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I believe the plug on the 89+ harness is just black. There is no pigtail on the CPS side, the connector is built into the CPS housing. You could cut the end off of the '91 harness and wire in the end from the '87 harness. Is there a reason your harness can't be rebuilt? Toyota does still sell many of the replacement connectors for it. It is a lot of work, but I don't know how bad it is... It may end up being just as much work to convert and swap a later model harness. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-09-2012, 06:36 PM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Check on availability of any that are significantly damaged. Some are discontinued. Some you will find are compatible with other vehicles even though they are not list as such... For example I believe the '89+ N/A ECU connectors are compatible with earlier years, just the color is different. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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04-07-2012, 06:34 PM	#3
supraheelfan 3" Exhaust Join Date: Feb 2011 Location: Wilmington, NC Posts: 178	The only harness I have found in 3 months is a 91 and wanted to see if it was possible. The 89+ cps connectors would have which color plugs? yellow or grey or whatever color they make them?

04-09-2012, 05:23 PM	#5
supraheelfan 3" Exhaust Join Date: Feb 2011 Location: Wilmington, NC Posts: 178	I did not know Toyota sold replacement connectors. Thanks. We are going to try to rebuild the old one.