1990 ecu paired w/ a 1986.5-1989 engine

mkiiisupra · 01-29-2008, 12:40 AM

Any complications with this? found out the engine in my 1990 supra is from a pre 90 and i know 90 was when supra changed alota stuff...

Mainly refering to the TPS does the 89 and 90 have the same resistances? becuase they TPS are of diffrent designs.

Pretaco · 01-29-2008, 05:54 AM

I have no idea.
I put a 90 wire harness and ecu into an 88 car, but I think I used most of the 90 sensors.

supramacist · 01-29-2008, 06:04 AM

It won't work right the ecu's are engine coded.

From what I understand anyway.

Find out what year engine you have.

Thats the ecu you need.

mkiiisupra · 01-29-2008, 06:13 AM

well if that is the case erm my ECU only throws a code with one componant, the TPS which is pretty busted up, and currently replacing it. I cant seem to find info on pre 90 resistances for the TPS, i mean if resistances are the same then......

One thing i noticed was MKIII Supra Graveyard has the 7mgte auto ecu/ect all grouped together.

Why i bring this up is my TPS part number is for a 86.5-89... and the 90 sensor doesnt fit the same, the plastic bit on the inside is verticle instead of horizontal if i remember right.

I guess ill just install it and see if engine code goes away if not you think just a throttle body from a 90 and the 90 tps will fix the problem ? lol

mkiiisupra · 01-29-2008, 06:36 AM

Did some looking around on the parts catalogue.... aparntly all the throttle body are the same... so kind of confused as to why one sensor has a verticle plastic peice and the other a horizontal one

And all the TPS are the same lol..... i guess they just sent me the wrong one... ahh well

good to know i have nothing to worry about and another reason i have to not trust the toyota dealer in sumter sc...... guy even asked for my vin number to make sure it was the right part

know of a way to check to year on my engine just so i know for sure?

kerpal · 02-29-2008, 08:21 AM

Quote:

Originally Posted by mkiiisupra

well if that is the case erm my ECU only throws a code with one componant, the TPS which is pretty busted up, and currently replacing it. I cant seem to find info on pre 90 resistances for the TPS, i mean if resistances are the same then......

One thing i noticed was MKIII Supra Graveyard has the 7mgte auto ecu/ect all grouped together.

Why i bring this up is my TPS part number is for a 86.5-89... and the 90 sensor doesnt fit the same, the plastic bit on the inside is verticle instead of horizontal if i remember right.

I guess ill just install it and see if engine code goes away if not you think just a throttle auto body part from a 90 and the 90 tps will fix the problem ? lol

How is your car now?? I didn't know that.... The ecu is grouped together???

btwilson86 · 02-29-2008, 09:15 AM

I had actually just run into the same problem with the TPS... I got one of the newer sensors (with the metal exterior as opposed to plastic) from a local pick a part (fits in the pocket, so you can't beat that price). Got home and found out that the interior's of the sensor were different. After thorough inspection and a little reading, found out resistances are the same for all the TPS's, just design difference. So I went and picked up a newer TB to go with my sensor (as I couldn't find an older sensor), calibrated it and installed it on my engine, and *VOILA* TPS CEL goes away.

mkiiisupra · 02-29-2008, 01:59 PM

the old on i have seems more sturdy, the interior parts are metal where as the newer ones 89+ are plastic on the inside.

btwilson86 · 03-02-2008, 06:19 AM

I might have had the age mixed up on the one's I was describing... Either way, metal is better. My plastic one's interiors melted (maybe when I overheated and blew my first motor). I don't see that happening with the metal parts in the TPS.

mkiiisupra · 03-02-2008, 12:13 PM

I have had no compatablility problems with running a 90 ecu on a pre 89 engine.

Seems like yeah maybe diffrent parts but they all send they same signals to the ecu

01-29-2008, 12:40 AM	#1
mkiiisupra Lexus & 550's Join Date: Sep 2007 Location: Las Vegas, NV Posts: 570 Blog Entries: 1	1990 ecu paired w/ a 1986.5-1989 engine Any complications with this? found out the engine in my 1990 supra is from a pre 90 and i know 90 was when supra changed alota stuff... Mainly refering to the TPS does the 89 and 90 have the same resistances? becuase they TPS are of diffrent designs. __________________ 1990 Toyota Supra Turbo A/T ------------------------------------------------ Questions about oil? take a look http://www.supramania.com/aehaas/

01-29-2008, 05:54 AM	#2
Pretaco 3" Exhaust Join Date: Dec 2007 Location: Glendale, AZ Posts: 126	I have no idea. I put a 90 wire harness and ecu into an 88 car, but I think I used most of the 90 sensors. __________________ '88 Supra Targa 5 speed w/ '90 7M-GTE Currently Running Good For Sale: Light blue body parts, Blue interior parts all from '90 supra targa turbo manual. Also for sale: R154 trans, brake pedal, master cylinder, booster, abs actuator, sensors, abs ecu, driveshaft, 3.90 lsd rear end, radiator, wiring, speedo cable, 8 saw blade wheels, '88 ecu, relays, cruise control actuator (bad cable), empty fuel tank, etc....

01-29-2008, 06:13 AM	#4
mkiiisupra Lexus & 550's Join Date: Sep 2007 Location: Las Vegas, NV Posts: 570 Blog Entries: 1	well if that is the case erm my ECU only throws a code with one componant, the TPS which is pretty busted up, and currently replacing it. I cant seem to find info on pre 90 resistances for the TPS, i mean if resistances are the same then...... One thing i noticed was MKIII Supra Graveyard has the 7mgte auto ecu/ect all grouped together. Why i bring this up is my TPS part number is for a 86.5-89... and the 90 sensor doesnt fit the same, the plastic bit on the inside is verticle instead of horizontal if i remember right. I guess ill just install it and see if engine code goes away if not you think just a throttle body from a 90 and the 90 tps will fix the problem ? lol __________________ 1990 Toyota Supra Turbo A/T ------------------------------------------------ Questions about oil? take a look http://www.supramania.com/aehaas/

01-29-2008, 06:36 AM	#5
mkiiisupra Lexus & 550's Join Date: Sep 2007 Location: Las Vegas, NV Posts: 570 Blog Entries: 1	Did some looking around on the parts catalogue.... aparntly all the throttle body are the same... so kind of confused as to why one sensor has a verticle plastic peice and the other a horizontal one And all the TPS are the same lol..... i guess they just sent me the wrong one... ahh well good to know i have nothing to worry about and another reason i have to not trust the toyota dealer in sumter sc...... guy even asked for my vin number to make sure it was the right part know of a way to check to year on my engine just so i know for sure? __________________ 1990 Toyota Supra Turbo A/T ------------------------------------------------ Questions about oil? take a look http://www.supramania.com/aehaas/ Last edited by mkiiisupra; 01-29-2008 at 06:41 AM.

02-29-2008, 09:15 AM	#7
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	I had actually just run into the same problem with the TPS... I got one of the newer sensors (with the metal exterior as opposed to plastic) from a local pick a part (fits in the pocket, so you can't beat that price). Got home and found out that the interior's of the sensor were different. After thorough inspection and a little reading, found out resistances are the same for all the TPS's, just design difference. So I went and picked up a newer TB to go with my sensor (as I couldn't find an older sensor), calibrated it and installed it on my engine, and VOILA TPS CEL goes away. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

01-29-2008, 06:04 AM	#3
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	It won't work right the ecu's are engine coded. From what I understand anyway. Find out what year engine you have. Thats the ecu you need.

02-29-2008, 01:59 PM	#8
mkiiisupra Lexus & 550's Join Date: Sep 2007 Location: Las Vegas, NV Posts: 570 Blog Entries: 1	the old on i have seems more sturdy, the interior parts are metal where as the newer ones 89+ are plastic on the inside. __________________ 1990 Toyota Supra Turbo A/T ------------------------------------------------ Questions about oil? take a look http://www.supramania.com/aehaas/

03-02-2008, 06:19 AM	#9
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	I might have had the age mixed up on the one's I was describing... Either way, metal is better. My plastic one's interiors melted (maybe when I overheated and blew my first motor). I don't see that happening with the metal parts in the TPS. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

03-02-2008, 12:13 PM	#10
mkiiisupra Lexus & 550's Join Date: Sep 2007 Location: Las Vegas, NV Posts: 570 Blog Entries: 1	I have had no compatablility problems with running a 90 ecu on a pre 89 engine. Seems like yeah maybe diffrent parts but they all send they same signals to the ecu __________________ 1990 Toyota Supra Turbo A/T ------------------------------------------------ Questions about oil? take a look http://www.supramania.com/aehaas/

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