1G 1g diag code flashes

[Turbski91]

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Just want to confirm these codes. I believe these are codes 13, 41, and 43. Intake air temp, injector, and EGR? This is my first time doing this. My car is stumbling at 4k rpm and seems to sputter at idle every once in awhile.

 

[19Eclipse90]

Those are what I’m seeing, also.

 

[Turbski91]

Those are what I’m seeing, also.

The EGR is deleted. So I’d imagine this code is caused by the sensor being unplugged. I was having injector harness issues on first start up, and have not unplugged the battery since. So that could explain the injector code, but I’m confused about the intake air temp code. Would that be a bad MAF?

 

[19Eclipse90]

Most likely. You can double check your connections, make sure all pins are seated properly at the MAF, and that wiring from the MAF to the ECU is good. Reset the ECU to see if the code remains.

There’s this old tip from VFAQ regarding the EGR:

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[steve]

Since only California and all the 1994 ECUs have EGR sensors what Car and ECU are you working with?

 

[Turbski91]

Since only California and all the 1994 ECUs have EGR sensors what Car and ECU are you working with?

Car is a 91 AWD turbo. Not sure if it’s a Cali car or not. I’ll post a pic of my ecu. I’m mostly concerned about the intake air temp code. I’m assuming that would mean i have a bad MAF. The car seems to be running rich at idle, and pops every once in awhile.

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[steve]

That explains it. 1994 Federal AWD ECU MD304484 E2T60879. Good news is that it's an EPROM ECU, bad news is the resistor trick doesn't work because in 94 all the cars had California style EGR so if I remember right the code only has the EGR path.

It also has original capacitors and those need to be replaced ASAP. I'd send it to ECMTuning and let them socket and replace the caps. If you can't swing for DSMLink, I still have lots of EPROMs that I could put the E931 code on. Come to think of it I have some original E931 EPROMs too.

A real 91 ECU for that car would be either MD166262 or MD165531 depending on manual or automatic.

 

[Turbski91]

That explains it. 1994 Federal AWD ECU MD304484 E2T60879. Good news is that it's an EPROM ECU, bad news is the resistor trick doesn't work because in 94 all the cars had California style EGR so if I remember right the code only has the EGR path.

It also has original capacitors and those need to be replaced ASAP. I'd send it to ECMTuning and let them socket and replace the caps. If you can't swing for DSMLink, I still have lots of EPROMs that I could put the E931 code on. Come to think of it I have some original E931 EPROMs too.

A real 91 ECU for that car would be either MD166262 or MD165531 depending on manual or automatic.

Yes i was planning to send it out. Are you thinking that this could be the MAF code?

 

[Turbski91]

I think i might be onto something with the popping/running rich at idle. I think i put a non turbo 1g fuel pressure regulator on. Fuel pressure at idle is at 55psi. I’m sure this is an issue, and i will order a turbo FPR, but does anyone else think this could cause my issue?

 

[steve]

The IAT sensor fault code, not likely. It doesn't look like any caps have leaked yet. I'd check the IAT resistance and verify the wiring to the MAF and the correct MAF since it sounding like a pieced together car.

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[Turbski91]

The IAT sensor fault code, not likely. It doesn't look like any caps have leaked yet. I'd check the IAT resistance and verify the wiring to the MAF and the correct MAF since it sounding like a pieced together car.

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Thank you!

@steve i forgot to mention when i got this car it did not have an ECU in it. The owner claimed it was a 90 model, but the vin said it was a 91. Is it possible the two wires are swapped at the ecu and causing any of these codes?

 

[steve]

The two that swap are 6 and 14. One is for the MAF reset, not the IAT and the other for the IPS on the throttle body to tell the ECU it's closed.

So while you should check those wouldn't cause it.

I assume it has a build date of sometime after June 1990 but before Jan of 1991. That can confuse people who don't know better when the model year started.

 

[Turbski91]

The two that swap are 6 and 14. One is for the MAF reset, not the IAT and the other for the IPS on the throttle body to tell the ECU it's closed.

So while you should check those wouldn't cause it.

I assume it has a build date of sometime after June 1990 but before Jan of 1991. That can confuse people who don't know better when the model year started.

Do you happen to know what color the wires should be in pins 6 and 14 for a 91 model? Also which connected would this be? I know it’s ecu, but not sure which one of the three

 

[steve]

I do and I'll tell, but you should have the FSM if you're going to own a DSM. I also suggest everyone read the DSM DTM that Chrysler put out for the introduction of the 1990 Talon. Links are in https://www.dsmtuners.com/forum/articles-manuals-documents.262/ if you don't.

ECMTuning was nice enough to make these years ago and they are still on their web site. I use them often since I don't remember all the pins anymore.

On a 91 pin 6 should be a green/white wire and pin 14 a green wire. On a 90 Car and ECU pin 6 is the green and pin 14 the green/white.

 

[Turbski91]

I do and I'll tell, but you should have the FSM if you're going to own a DSM. I also suggest everyone read the DSM DTM that Chrysler put out for the introduction of the 1990 Talon. Links are in https://www.dsmtuners.com/forum/articles-manuals-documents.262/ if you don't.

ECMTuning was nice enough to make these years ago and they are still on their web site. I use them often since I don't remember all the pins anymore.

On a 91 pin 6 should be a green/white wire and pin 14 a green wire. On a 90 Car and ECU pin 6 is the green and pin 14 the green/white.

Thank you for all of your knowledge and time! I appreciate you!