Wrong Computer?

[RAMSEY]

Purchased a 93 non turbo. I have been having idle issues since day one. After changing out the idle set screw and re adjusting the idle, it now just stays in high idle around 1200 or so. Idle control sensor that sits on the top of the throttle body is bad and am currently in the process of changing this. I am told something about a ground or continuity of a signal from the ecu is a current issue. Bring car in to a good mechanic and am told that the computer, when pulled from the car has a recondition stamp. Upon further inspection using the part umbers on the ecu it shows up as a 1990 non turbo. My mechanic has told me the pins are different from those years, including the one controlling the issue. Would this be a definite reason for idle and the lack of cruise control? Were these computers interchangeable, I believe the throttle body was different those years.

 

[Hug_the_retard]

Pins 6 and 14 have to be swapped in the harness, and the power transistor has to be changed also.. If your car is a turbo car, then the non turbo ecu doesn't have a knock board in it.. The car will run on it, but it's not smart because knock on a forced induction car can be catastrophic..

 

[19Eclipse90]

First off...

If your car is a turbo car, then the non turbo ecu doesn't have a knock board in it..

Purchased a 93 non turbo.

Upon further inspection using the part numbers on the ecu it shows up as a 1990 non turbo.

Glad we got that cleared up.
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Second...

Pins 6 and 14 have to be swapped in the harness...

There is no pin swapping when dealing with non-turbo harnesses and ECUs. Why? Because non-turbo cars do not have the MAF Active Filter Reset in the MAF. So all that will be done is moving pin 6 to pin 14 OR (note: not AND) vice versa, depending on what combination of harness and ECU you have.

1990 ECU Pin 6 = Idle Position Switch = 1991-1994 ECU Pin 14
1990 Turbo ECU Pin 14 = MAF Active Filter Reset = 1991-1994 Turbo ECU Pin 6
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Finally...

and the power transistor has to be changed also..

Not true at all.

 

[RAMSEY]

Car is a non turbo. Going through most items such as tps, biss, ic motor, all in good standing and test good (voltage) but there's apparently a different computer in the car. The number on the ecm pulls up a 90 non turbo in mine which, mine also a non turbo but a year 93. Are the computers interchangeable these years without an idle issue. Currently switching it out to a correct year ecm, but wondering if anyone had knowledge of it affecting idle specifically consistent high idle.

 

[codym]

First off...



Glad we got that cleared up.
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Second...

There is no pin swapping when dealing with non-turbo harnesses and ECUs. Why? Because non-turbo cars do not have the MAF Active Filter Reset in the MAF. So all that will be done is moving pin 6 to pin 14 OR (note: not AND) vice versa, depending on what combination of harness and ECU you have.

1990 ECU Pin 6 = Idle Position Switch = 1991-1994 ECU Pin 14
1990 Turbo ECU Pin 14 = MAF Active Filter Reset = 1991-1994 Turbo ECU Pin 6
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Finally...

Not true at all.

Nailed it

OP do as Brian said, regarding moving pin 6 to 14 or vice versa.

http://www.dsmlink.com/images/forums/1GECUPinout.pdf

Also the ignition diagnostic plug, located directly behind the battery, needs to be grounded out while making changes to the BISS.

After changing out the idle set screw and re adjusting the idle, it now just stays in high idle around 1200 or so..

If relocating either pin does not resolve your issue, here is a good walk through on pin-pointing your high idle.
Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)

 

[92AWDHX40]

Check all the idle stuff related above in the link for idle issues, besides the ecu.

 

[RAMSEY]

Yes, as stated all the "stuff"related to idle issues were checked, leading to an issue with what was thought to be the cruise control module.After testing, it was in correct working order. The problem seems to be that while butterfly is at closed position, it is still receiving voltage, in turn causing a higher idle. It is thought instead being a possible issue with the ecm, as it was from a different year and the pin concerning idle is not present. Would a different computer of that year cause a high idle issue? I see per the schematic there is a pin difference. Question is, has anyone had a similar issue with this?

 

[RAMSEY]

That's very inconsiderate of you to hijack someone's thread instead of simply starting your own.

That being said, I was told that when said pins were swapped over nothing has changed.

 

[1GDSMGreek]

That's very inconsiderate of you to hijack someone's thread instead of simply starting your own.

That being said, I was told that when said pins were swapped over nothing has changed.

You are absolutely right and I apologize. I incorrectly assumed that starting a new thread would be frowned upon. It will not happen again.

 

[codym]

That being said, I was told that when said pins were swapped over nothing has changed.

That's because you don't swap the pins, as clearly underlined above.

 

[1G Eclipse94928]

Yes, as stated all the "stuff"related to idle issues were checked, leading to an issue with what was thought to be the cruise control module.After testing, it was in correct working order. The problem seems to be that while butterfly is at closed position, it is still receiving voltage, in turn causing a higher idle. It is thought instead being a possible issue with the ecm, as it was from a different year and the pin concerning idle is not present. Would a different computer of that year cause a high idle issue? I see per the schematic there is a pin difference. Question is, has anyone had a similar issue with this?

You still are totally ignoring the main posts that will solve your issue.... No one will beg you to read what has already been posted, well i guess except for me.

 

[HONDA KILLA]

HI everyone this is my first post to DSMtuner and I was going to make a whole new post but this seems senseless since this post fits my issue to be I have a 91 talon tsi awd its idle goes up and down between 1200 and 1000rpms I rplaced the fiav But im getting a checkengine light for tps sensor I tested it and at closed throttle its .4 Ohms and reads 16 Ohms full throttle so I know its bad tps but I also tested the harness to the tps and the middle 3wire isn't getting power all 2 wires to the tps have .5v from the harness but the middle wire doesn't any1 know what it could be I was told It could be the ecu since my car is all stock everything 111,000 exact and its my DD so I would love to get I fixed asap. EDIT also I found this link idk if its true it says the 3 wire dosent have a use is that TRUE OR NOT .http://www.dsmtuners.com/forums/newbie-forum/371845-tps-wiring-setup-need-help-asap.html