JimVR4's Spyder VR4 Chrome Tuning Experience

[CoopKill]

Jim the pin assignments are here as well: Stealth 316 - ECM pin assignments

[Jimvr4]

Jeremy, thanks. If I'm not wrong the right bank is 1,3,5 and the left is 2,4,6. So according to the service manual my 1995 harness has:

Front (O2 housings)
Right bank - pin 75
Left bank - pin 76

Rear (O2 in downpipe)
Right bank - pin 60
Left bank - pin 79

According to what I can find the 99 ECU needs:
Front (O2 housings)
Right bank - pin 72
Left bank - pin 71

Rear (O2 in downpipe)
Right bank - pin 74
Left bank - pin 73

I currently have pin 71 wired to 75 and 72 wired to 76 so these are backwards. The downstream sensors are wired OK already.

[Jimvr4]

Jim the pin assignments are here as well: Stealth 316 - ECM pin assignments

Thanks Bill, I found them and got a little confused because in the manuals front and rear refer to Pre cat or Post cat instead of front and rear banks like Jeff has. I also couldn't find the actual 1999 shop manual wiring which would clarify this since Jeff's tables show 71 and 72 for the front but don't distinguish which is right bank and which is left. I found a table on Jester's site which had what I posted above for the post cat wiring.

[J. Fast]

For clarification the o2 feedback is reversed on the banks? Is this specific to Spyder models and makes? Does the stock ECU trim each bank individually?

Where did you find the wiring info for the Clone ECU's Jim?

[Greg E]

For clarification the o2 feedback is reversed on the banks? Is this specific to Spyder models and makes? Does the stock ECU trim each bank individually?

Where did you find the wiring info for the Clone ECU's Jim?

Well no, it's not specific to the spyder... It's all Cali and fed emission spec 94/95 cars.

Each bank has its own fuel trim, but for whatever reason the fed and Cali cars have these inputs reversed. Probably something they did to keep people from swapping a fed ECU into a Cali car...

[RealMcCoy]

It can be a bit confusing converting to OBDII nomenclature from manufacturer specific terminology. Particularly when the manuals are not particularly specific on the earlier stuff, and the manual specifically ignores the switched front sensor inputs in the factory diagrams for 94/95 Cali cars...

For OBDII the proper terms are Bank1 and Bank2. Bank1 always contains cylinder #1. The pre-cat sensors are considered sensor1, post-cat, sensor 2. So you have B1S1, B1S2, B2S1, B2S2...

When referring to left or right bank, the perspective is from the rear (transmission end) of the motor. (as if you are sitting in the driver seat of a RWD conventional chassis car) On our cars, that makes the left bank the firewall side, but there are many Mitsubishi cars with the trans on the other side of the car, and the left bank on the radiator side. Which is why I believe it's dangerous to refer to the the banks as Front/Rear. (and as you discovered, Mitsu refers to pre/post cat sensors as front/rear)

I know most of what I just posted is known, I just figured I'd condense it a bit for future searchers....

[Jimvr4]

Thanks Larry. I swapped the wires per the plan and flashed the ECU back to dual narrow bands. Car runs perfectly now. I am so stoked

[J. Fast]

Great to know that was the fix! Awesome, go play!

[D.I.P.]

It seems like we are starting to see alot of these threads popping up now where pins are swapped in the PNP harnesses for the clone ECU and it is worrying. Think im going to inspect my harness when i get home tonight before i even attempt to install it in the car...

Glad it was a simple fix for you!

[Greg E]

It seems like we are starting to see alot of these threads popping up now where pins are swapped in the PNP harnesses for the clone ECU and it is worrying. Think im going to inspect my harness when i get home tonight before i even attempt to install it in the car...

Glad it was a simple fix for you!

If you own a 94/95 car and order a harness from Brett, you have to make sure to specify if you have a fed or a Cali car. If you don't, there's a chance you'll get the wrong one.

To be fair, the harness in this thread isn't a unit from Brett. Only the ECU is.