Hey guys, don't hate me too much but yes, I am a DSM guy. I am trying to get my 1G running correctly with the Evo ECU. Actually, it's a 3G ECU and I am using the Tephra V7 ROM (96530706). Really didn't want to have to register here and ask you guys for your help, but I have been searching and searching for WEEK's. All the information on the web is very spotty and you have to dig through 30+ page long threads to find anything.

A little background, I bought a 1G GSX shell back in October. I have been building this thing from the ground up. Wire tuck, fuse box relocation, battery relocation, deleted a bunch of stuff (ABS, AC, PS, emissions, EGR, FIAV, IAC, heater core, cruise, etc.), painted the engine bay, complete overhaul. Car has a built 6 bolt, 1G CAS, 2G MAF (until I get this up and going, then switching the SD), RC 550's (also until I get this up and running, then putting in my FIC 1600's).

The car will fire up and run great with the stock 1G ECU. When I remove it and install the 3G ECU with patch harness, with my current ROM, or any ROM for that matter, it will run poorly. It won't idle on it's own, I have to keep my foot on the gas and keep it at 1100-1200RPM. It otherwise, sounds OK at "idle". When I try to rev it, it will sound like and IC pipe is off. Sounds like ****, cuts out/misfires, whatever you want to call it. See video below.

I have the correct MAF values for the 2G MAF, MAF scaling and compensation. Obviously the immobilizer is disabled. I left the injector scaling at 513 and added to the injector latencies with the correct latencies.

The engine runs the same whether or not I have a completely default Tephra V7 ROM (any of the ROM's) with immobilizer disabled. Even after the MAF and injector adjustments, it doesn't really run any different.

I have tried messing with the firing order. I tried the Evo firing order, 1342. Barely ran with this. Tried the reverse DSM firing order, 3214. Same thing. So, I know my 4123 firing order is the correct firing order. Even though I have read on multiple threads (including on EvoM) where people said you had to run the Evo firing order. Other people said you had to use 3214 and others said you don't need to change the firing order at all. This is the kind of stuff I find when searching anything about the Evo ECU in a DSM.

I also played around with my injector plugs, switching them around to a few different combinations, no change AT ALL.

I have a wideband, but it's not connected yet. Interior is still apart, exhaust isn't installed, drivetrain isn't installed. My front o2 sensor is not wired up yet either because I still have my 2G o2 sensor in this o2 housing. So I either need to wire this 2G o2 sensor into the 1G wiring or change out the sensor with a 1G sensor. I also have an Evo knock sensor installed.

I am hoping one of you can point out something that is required to be done within ECUflash or physically with something else that I have not picked up on yet.

Anyway, thanks for reading and feel free to link any threads that may prove to be helpful.

ATTACHED IS MY ROM AND A LOG FROM EVOSCAN

 

Welcome!

I'm going to move your thread to a tuning forum, I'm sure one of our members will be able to help you out. Good luck!

Bob

 

Thanks! And sounds great, figured there was a better suited forum for this.

 

Your log shows no airflow which means that your MAF is not connected correctly to the ECU. Without a MAF signal the ECU cannot calculate the injector pulse width and your engine runs like crap.
Check the wiring using http://www.roadraceengineering.com/e...-ecuwiring.htm
The MAF input should be on pin 90.

 

Thanks for the reply. I took out the ecu and patch harness to change something today. More info about what I changed is below. When I put the ecu back in, I noticed a wire pulled off a pin (dsm side of the patch harness). I looked at the pinouts and figured out what it was. It was MAF related. So I put it back on the correct pin. But then after my changes, the car won't start at all now. No fuel pressure at the AFPR.

Here us a post I made earlier on Facebook.

$10 PayPaled to anyone that can figure this out.

Car- 92 GSX
ECU- 3G 2001 i4 manual transmission ECU with Tephra Mods Evo ROM flashed onto it. With Evo ECU patch harness. MAF scaling, MAF compensation, injector scaling, and injector latencies were swapped into the tune.

The car ran with this ECU, but ran like crap. Had to keep my foot on the throttle and hold the RPM's at 1100-1200. When I revved it up, it sounded like an IC pipe was disconnected.

I can put my 1G DSM ECU in and the car will idle, rev, and otherwise sound perfect.

Yesterday, I looked over the ECU pinouts between the 3G ECU and the Evo 8 ECU. The 3G doesn't have a BCS (which I already knew) but I don't plan on using the boost-by-gear feature anyway (MBC FTW!).

I noticed another difference. Pin 8 & 22 are swapped between the 2 ECU's.
Pin 8 of the 3G ecu is for the Fuel Pump Relay.
Pin 8 of the Evo ecu is for the AC Relay.
Pin 22 of the 3G ecu is for the AC Relay.
Pin 22 of the Evo ecu is for the Fuel Pump Relay.

I modified my patch harness to move the wire in pin 22 of the ECU side of the patch harness to reside in pin 8.

Now the car won't run at all, no fuel pressure while cranking.

With an Evo ECU, the wiring goes as follows:
DSM pin 56-->pin 22 of the ECU connector.
DSM pin 56 is one of three MPI Control pins.

Now, pin 56 is running to pin 8 to accommodate the 3G/Evo ECU pinout differences.

The other two MPI Control pins from the DSM side both run to pin 38 of the ECU side. Pin 38 is a pin for the MFI Control.

DSM's don't have a "Fuel Pump Relay" in the pinout of the ECU.

My question is, WTF???

Should I run pin 56 to pin 38, like the other 2 MPI pins?

 

After making the pin change, I took a log with the key on and while cranking. MAF values were working when cranking. I will attach the log. Maybe if I swap the pins back to like they were, it will run fine now. I assumed that the pulled wire on the patch harness happened while I was working on it and switching the pins around. MAYBE, the MAF wire was pulled out before, hence why the car ran like ****. Sounded just like a car with the MAF unplugged.

 

UPDATE:

Switched pin 8 back to pin 22, put the ECU back in the car and now it runs great. So the MAF wire was indeed pulled out to begin with. I am still confused though, from the pinout of the 3G i4 manual, pin 8 and 22 are swapped from the Evo 8 ECU pinout.

So, either the pinout I have is not accurate or I have an Evo 8 ECU. I was told it was a 3G ECU. I ran the serial number the other day and it came back as a 2001 i4 manual 3G Eclipse. But I guess maybe the case is from a 3G and not the internals. Or maybe there is something I don't know. Anyway, problem is fixed.

 

Glad you were able to solve it.

 

Thanks man, me too. It was pretty frustrating. You were the one that caught the MAF wasn't reading anything in the log I posted. That led to me looking into that more. So thank you!

 

Sounds like he should get a $10 pizza on you

 

The 8 and 22 are swapped on a 2g and some evo 7 not on a 3g . What cam sensor are you using? I was contemplating running a 1g cas on my 2g with evo 8 ecu since it has output for both cam and crank sensors.

 

That makes sense. So the only difference between the 3G and Evo ecu is that there is no boost control solenoid pin? Is there a pin in the actual ecu, just not in the 3G harness? Or is the ecu empty of this pin as well?

A 1g CAS is the best CAS for our dsms. Easy to replace unlike the 2g cam/crank sensors and it is adjustable.