JZA70 1JZGTE into a 90 MKIII, problems with check engine light temp gauge and RPM.

Kruso

2J>7M
Jun 9, 2007
34
0
0
41
SugarLand
I've got a very weird problem going on with my 1JZGTE swap into my 90 and was wondering if any of you guys would know where to go next. Cliff notes...

Extended the harness personally one wire at a time (content with it being done properly).
Switched over the body plugs to work with the MA71 body plugs.
Performed all plumbing under the hood including all the misc wiring (including EA2 connector).
Started the car...STARTED!

Car has a very low, rough idle.
NO CEL, temp gauge, RPM (using turbo tach), and no cluster lights lighting up (already checked rheostat and bypassed it).

Battery light lights up at "on" position and goes away once started.
All the vehicle outside lights working properly.

Researching the boards I've done the following. Verified the dome and gauge fuses (including every other fuse) are in good working order.

I've also taken apart most of the car and the interior in tracking down this issue and have come to this conclusion... the problem is within the MKIII and not necessarily the 1JZGTE swap as when I go to the "equivalent" of M1 body plug (on the chasis side) female plug and plug supply either a positive or a negative to the grey/green wire for the check engine light... nothing happens on the dash. Same thing.

Note: My 90 does not have a M1 plug, rather I have a much smaller in design plug that contains all the correct sequence/ color of wires that the M1 connector would have contained leading me to the conclusion that I am working with the right plug. Now, manipulating that female connector I can make my backup lights come on but not the check engine light.

I apologize for such a long post, I've been up working on the MKIII for the past 16hrs and my thoughts are everywhere. The body harness on this car has been changed out to one from another 90 MKIII (car was at one time converted to the 89 wiring from a donor and I didn't like leaving the airbag disabled so I opted to purchasing and installing all of the internal wiring back into the car).

Kruso
 

Scott 88-1JZ

New Member
Dec 9, 2007
122
0
0
California
I dont know if thise would help but I had the same problems when I swapped my motor from an 88 to an 89. Try actually replacing the guage fuse. I know its a long shot but mine actually tested fine with a voltmeter but I had some oil on the blade of the fuse and it did not make contact. I chased it for a few weeks and that was it. If not I would try tracing down the power wires in the electrical diagram and checking each point you can. This would include grounds.
 

Kruso

2J>7M
Jun 9, 2007
34
0
0
41
SugarLand
I think I might have just figured out the problem... I've owned the car for ten years and due to the 7M reliability its been sitting for most of that duration including this past time for over four years where someone decided to steal my cluster gauge and I currently have a 87 and reading this thread below.. that might be the problem.

http://www.supramania.com/forums/sh...e-problem&highlight=temp+gauge+cluster+lights

I'm on my way to see if I can find another cluster at a parts store.

Kruso
 

Kruso

2J>7M
Jun 9, 2007
34
0
0
41
SugarLand
I haven't been able to get my hands on one locally... checking online now. Yeah I know, I had this 87 fully functional in my 90 MKIII when the internal wiring was out of a 89T.
 

Cudadrt

New Member
May 23, 2010
5
0
0
Knoxville, TN
I was wondering if you have resolved this issue? If so, do you still have the 87 cluster and would you be willing to sell it? I am assuming it is a turbo cluster, correct? I have onr from a 90 turbo and can not get my check engine light to come on either. My car is a 88.