1g dsm knock sensor code 31 on non turbo car

[what9612]

first off, i have 91 laser 2.0 non turbo. had a bad ecu and i swapped it out with one i bought on ebay. car now runs but feels sluggish with alot of hesitation. i used the radio shack buzzer to pull code 31, which says (2.0L Only) Knock sensor (turbo only). my car has no turbo so im kinda confused. any help would be great. thanks

 

[19Eclipse90]

Take your ECU back out and check for a knock board or provide us the number on the white portion of the board itself. In the following link, that number reads 7380. If the knock board is present, regardless of your car having a turbo, the ECU thinks it should have a knock sensor.

ecu1gid [ECMTuning - wiki]

You can use your browser's find feature (Ctrl+F on a Windows computer) and cross reference that number on the white connector (tip: leave off the letter) with this site which will tell you what ECU you've actually got: Eclipse Talon Laser Galant 3000GT Stealth ECU ID Reference.

 

[what9612]

i will pull it tomorrow and check. now if it was pulled from a turbo car does that mean i cant use it at all?

 

[19Eclipse90]

You could, but it would be easier and, in the long run, better to find the correct ECU for your car.

 

[what9612]

i believe the ecu was for a turbo car. the white connector is stamped 6576n. the listing on ebay i bought it from clearly stated, 2.0L DOHC 4cyl 4G63 non turbo engine. the connector is stamped 4472a on the original one. is there any way to still use the turbo one or do i have to find another.

 

[92AWDHX40]

I would just find a turbo ecu, if you found a nt on ebay there are more out there.

 

[what9612]

i have a non turbo car, thats what im looking for

 

[92AWDHX40]

well get the one for your car like brian said.

 

[19Eclipse90]

i believe the ecu was for a turbo car. the white connector is stamped 6576n. the listing on ebay i bought it from clearly stated, 2.0L DOHC 4cyl 4G63 non turbo engine. the connector is stamped 4472a on the original one.

The lack of specificity on parts private sellers list for these cars really can be bothersome sometimes. Yes, it appears you do have a turbo ECU.

is there any way to still use the turbo one or do i have to find another.

The below is from: http://www.dsmtuners.com/forums/newbie-forum/180772-1g-eprom-turbo-ecu-n-t.html#post1507148. In a nutshell, things get harry real quick. I'll ask you if you'd like to be swapping pins in your harness, adding wires running to the ECU through the firewall, swapping injectors, buying a knock sensor, etc., etc., and is it worth all the hassle when all you need to do is find a '90 NT ECU?

Do note that, in your case, any mention of 450cc injectors below would be 390cc injectors since 6576 refers to an automatic turbo ECU.

I do know that you can use a n/t ecu in a turbo, but never heard anyone try a turbo ecu in a n/t, i would suspect that you can.

The big question is why?. It doesn't just plug in and work 100%.

The difference with the n/t ecu's is that it has no output for the stock boost guage, and no recognition for knock. I would say yes you can use it, but if you want to wait for someone to tell you for sure, then that's all good.

The NT wiring harness doesn't have pins on the connector for the boost gauge, knock sensor, FP solenoid, BCS, ABS, or MAF Reset and a NT ECU doesn't use them. The NT ECU doesn't have IC104 or IC106 (no FP solenoid, BCS, or MAF reset)and some of the pins are retasked on a NT ECU. It looks like pin 105 is used to switch the O2 Sensor heater on a NT and that's the BCS on a Turbo ECU.

Putting a Turbo ECU in NT car will cause throw a CEL for the missing Knock Sensor and pull timing all the way back. The O2 Sensor heater won't work like it should, the fuel will be really lean since the ECU expects 450cc injectors instead of the NT's 240cc and basiclly run poorly.

I've put NT 2.0L ECU's in the car for testing but I have to do really non-optimal things to the SAFC to get them to idle and I wouldn't even back out of the driveway without a the ECU having knock sensor support.

In general I can't understand any reason for putting a turbo ECU in a NT car and if you did the car would run poorly until you blew it up from not enough fuel.

Steve

 

[steve]

first off, i have 91 laser 2.0 non turbo.

i believe the ecu was for a turbo car. the white connector is stamped 6576n. the connector is stamped 4472a on the original one.

I'm confused your profile says you have a 90 NT and the 4472 is for a MD128624 90 Federal 2.0L NA car. If you had a 91 it should have had a MD166255 (6572).

The 6576 is for a 91/92 Federal 2.0L Turbo Automatic.

So what year car is it really. I'm pretty sure I have a few MD166255 on a shelf downstairs left over from when I was fixing ECU's.

 

[what9612]

sorry for the confusion, its a 90 ecu says 4472a, md128624.

 

[Spooled420a]

i have three sitting on the shelf for a few years, dont know what model they are for. they are md193299 md128625 md145903

 

[steve]

i have three sitting on the shelf for a few years, dont know what model they are for. they are md193299 md128625 md145903

You can use your browser's find feature (Ctrl+F on a Windows computer) and cross reference that number with this site which will tell you what ECU you've actually got: Eclipse Talon Laser Galant 3000GT Stealth ECU ID Reference.

This is why I put those pages up.

 

[Spooled420a]

my fault i missed that.....