Engine to ecu

[muddfisher85]

So I bought this 95 gst and was told it had a 99 gsx engine in it that was not running. I went on this site and looked up my ecu and the spare that came with the car Eclipse Talon Laser Galant 3000GT Stealth ECU ID Reference One of them model # E2T61683 which is out of a gsx made between 7/96-5/97. The other model # E2T61676 is out of a gsx made between 7/95-6/96. Now I can get the engine to idle rough and the air fuel ratio reads rich with the 61683, but when I put the 61676 in it will not start but the air fuel ratio reads lean. How can I figure out which ecu I need or can I just get one programmed for my car somewhere? And how can i tell what engine I really have?

 

[muddfisher85]

So today I replaced the battery terminals, fuel filter, spark plugs and wires, pcv valve. But no mater what i do i cant get it to start anymore.

 

[muddfisher85]

So I took my fuel rail off today and the numbers are INP- 018 which means stock. So come to find out it has a Walbro GSS 342 fuel pump. Which is a 255 Lph fuel pump so all I should need is an aftermarket FPR to fix the problem and use this pump right?

 

[muddfisher85]

So I got a stock pump for cheap threw it in and had to spary starting fluid in cylinder 4 to get it to start right away but it ran good at first then after warming up it started missing and air fuel gauge still reads rich. But I did get it to move I pulled it forward and backwards some but after moving it didnt want to idle anymore and the check engine light came on. I dont have a code reader but im leaning to one of the coil packs is going bad all the wiring looks good. One more thing it does have an exhaust leak right before the catalytic converter its a pretty big one looks like the bolts came loose but havent jacked it up yet. Could this cause the issue?

 

[delta448]

Not likely the exhaust is the problem, unless there's a exhaust leak before the front O2 sensor.

Can you verify the cam timing is correct?

If you haven't yet, install a new set of NGK BPR6ES plugs.

Have you done a boost leak test yet?

Have you checked the MAF wiring yet?

 

[muddfisher85]

So I checked the timing its fine. And I finally borrowed a code reader from a friend. The codes were P0115 Engine Coolant Temp Circuit Malfunction, P0110 IAT Sensor Circuit Malfunction, P0100 MAF or VAF Circuit Malfunction, P0105 MAP/BARO Circuit Malfunction. The P0115 Engine Coolant Temp Circuit Malfunction Is caused by there was no wire connector when I got the car I extended the wires and hooked them up but I wasnt sure which wire went where. I think I got them backwards. The other codes Im not sure though. No boost leak test yet, I will try to get to that soon. I think I am loosing fuel pressure when the car sits but I dont have a gauge yet, but you do have to spray starting fluid in cylinder 4 to get it to start right up. What should I check on the MAF wiring?

 

[delta448]

MAF, IAT and BARO codes mean something is wrong with your MAF sensor. Either the wiring to the ECU is damaged or disconnected somewhere, or the MAF itself is defective.

 

[JEFFREYCASTGSX]

Or a boost/vaccuum leak. Also I didn't see any mention of checking the coolant temp sensor, the one for the ecu not the gauge.

 

[delta448]

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Using the center column of this^ chart as a guide, check continuity between the ECU harness plugs and MAF sensor plug. Just to make sure, the pinouts are numbered so if you were looking at the actual pins sticking out of the side of the ECU board while holding the ECU in your hands, #92 would be upper left corner and #1 would be lower right corner.

Now, find corresponding pins in the 2G MAF harness:

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1 - 5V power supply for sensors
2 - Barometric pressure sensor
3 - Air flow sensor
4 - MPI control relay
5 - Ground for sensors
6 - Intake air temp sensor
7 - Volume air flow sensor reset signal
8 - None

2G MAF in a 1G TEL/GVR4

 

[muddfisher85]

So what does it mean 2g before and 2g after which ones should my car look like?

 

[dadsgsx]

the codes you pulled are the same ones i pulled when my ecu took a dump. get a friends ecu throw it in and watch the codes go bye-bye.

 

[delta448]

Using the center column of this^ chart as a guide, check continuity between the ECU harness plugs and MAF sensor plug.

The 2G Before column in the middle.
That pinout diagram was just the easiest one for me to dig up and came from the Evo 8 ECU swap thread. It was used over in that thread to describe which wires to swap when using an Evo 8 ECU in a 2G turbo DSM.

the codes you pulled are the same ones i pulled when my ecu took a dump. get a friends ecu throw it in and watch the codes go bye-bye.

The ECU may very well be the problem, you could check that if there's another 97+ turbo DSM around you that would let you try their known good ECU. If not, eliminate the MAF as a suspect before you buy another ECU. If you determine it's the ECU, I'll send you the extra 97 AWD ECU I have laying around.

 

[steve]

Also double check the spark plug wires. The order of them on the coils changes depending on which ECU your using.

 

[muddfisher85]

The 2G Before column in the middle.
That pinout diagram was just the easiest one for me to dig up and came from the Evo 8 ECU swap thread. It was used over in that thread to describe which wires to swap when using an Evo 8 ECU in a 2G turbo DSM.


The ECU may very well be the problem, you could check that if there's another 97+ turbo DSM around you that would let you try their known good ECU. If not, eliminate the MAF as a suspect before you buy another ECU. If you determine it's the ECU, I'll send you the extra 97 AWD ECU I have laying around.

So is there a way to test a MAF. I have two the car came with an extra. I cleared the codes and tried them both. The same codes came up again on either or minus the coolant temperture sensor I switched the wires seems to have fixed that. The wires on both ends look fine at the ecu and MAF. I have no tuner buddy to switch ecu's with or I would. Might just have to get another one. To bad I cant use the 95-96 one that I already have.

And to the other guys question about the spark plug wire order. I just went by what was in the Haynes manual What should it be? I have a 99 gsx engine in a 95 gst

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I found a plug right below the MAF Does anyone know where it goes It has four wires a looks like this

 

[steve]

That kind of looks like this one for the front O2 sensor. http://www.dsmtuners.com/forums/151542283-post40.html

What color wires are going to it.

As far as plug wires. http://www.dsmlink.com/wiki/swapplugwires
I believe it is really an issue of CAS Types vs ECU version. So mixing engine years and ECU years on a 2G can have the same effect.

 

[delta448]

Also could be the cruise control vacuum pump connector. Especially since it's in the MAF area and covered with that plastic split loom. Usually the O2 sensor wiring doesn't have split loom on it.

As Steve mentioned, the plug wires should be double checked in case the previous owner was trying to use the 96 ECU with the 99 engine.

 

[muddfisher85]

The plug must be for the cruise control there is a switch inside but no where to be found under the hood

So the plug order was fine with the 97 ecu I had in it but had those three codes and ran like crap. So After thinking about it I said screw it and but the 95-96 board back in but this time I changed the sparkplug order like the link said. I cranked it once and it fired right up and ran. Now the idle was waving between 1000 rpms and 2000 rpms but ran good I was surprised! I let it warm up and no more CEL. Now with this ecu my air/fuel ratio gauge says its running lean. Where with the other one it said it was running rich all the time now at least it moves a little why is that? Could it be because I took the walbro 255 out and went back to stock or what? But wow Im happy it starts right up no issue! Now we are getting somewhere.

 

[delta448]

Stick with the 97 ECU since you're using the 2Gb CAS.

Hmmm... if the CC was deleted, I wonder what else may have been thrown in the trash too...

Have you used a volt/ohm meter to test any of the MAF section of the wiring harness for no resistance to ground yet?

I'm thinking either the MAF plug is damaged or the wiring harness got smashed or cut during the engine swap. Of special interest would be the +5 volt supply wire and the sensor ground wire.

 

[muddfisher85]

Stick with the 97 ECU since you're using the 2Gb CAS.

Hmmm... if the CC was deleted, I wonder what else may have been thrown in the trash too...

Have you used a volt/ohm meter to test any of the MAF section of the wiring harness for no resistance to ground yet?

I'm thinking either the MAF plug is damaged or the wiring harness got smashed or cut during the engine swap. Of special interest would be the +5 volt supply wire and the sensor ground wire.

So stick with the 97? The car wont start without starting fluid with this board and runs like crap. On the 95 -96 board it runs good fires right up. Thought of taking it for a test ride, other then the idle issue stuff seems good. So how could the wiring be bad if it runs on one board but not the other. It really makes me think that I need another 97 ecu.

I havent put a voltmeter on the MAF plug yet but wouldnt the CEL come on either boards if the wiring was messed up?

So just went out there and started it again and the CEL came on but this time it was P0443 EVAP Emission Control System Purge Vavle C Fault but I checked the readings for the MAF it was actually showing a reading of 6.16 and the IAT was 79 and the coolant temperature was 166 so every thing seems to be working

 

[delta448]

If it's running well on the 96, stick with that. I didn't expect that, but whatever functions at this point is good in my opinion. You should get a CEL if you have a bad MAF sensor or an out of range signal, so I guess that's taken care of now?

That same 0443 EVAP purge solenoid code gave me a fight on my old Talon, the way I got rid of it was when I swapped in the Evo ECU and turned the check for it off in the ECU's periphery code. Didn't feel like spending the cash to replace emissions equipment when that stuff doesn't even get checked in this part of the country.

If it's running decent enough I'd try to take it for a short test drive.

 

[muddfisher85]

So what about the idle being high seems to stay at 2000 now? Would my exhaust leak cause this code?

Emission Control System Purge Vavle C
Where is this and how can I check it ? Will this effect my idle?

If you determine it's the ECU, I'll send you the extra 97 AWD ECU I have laying around.

How much do you want for this ecu? Sort of would like to keep the right ecu with the right engine.