P1605 code?

[maj Andres]

95/ka24de/manual

keep in mind this car used to be an automatic. Ok, so i went to auto zone today and used their obd2 computer and found out that i had a p1605 (manufacturer contrl. auxiliary inputs. auxiliary outputs) what does this really mean, and how do you fix it? It also threw out a P0705 [trans range sensor circuit malfuction (PRNDL input) ] i'm guessing that one has something to do because of the conversion. how do you fix that one?

thanks to all for the help

[offroadbob]

You need a FSM!!!

but the P1605 means that you are having a communication error w/ your ecu and your auto trans.

P0705 means that your park/neutral switch is malfunctioning do a search and find out how to trick you ecu into thinking it is in neutral for the manual swap.

[Dattebayo]

but the P1605 means that you are having a communication error w/ your ecu and your auto trans.

Here's a thought: Are you using the automatic ECU, or are you using the manual ECU?!?

[offroadbob]

Here's a thought: Are you using the automatic ECU, or are you using the manual ECU?!?

He swapped from an auto to a manual...

[thefro526]

It seems like switching to a manual ecu will solve your problem. The auto transmission has sensors and outputs the manual transmission lacks.

[maj Andres]

Yeah, when i purchased it i didn't know about the swap, just excited to get a 240!

[Dattebayo]

But an auto ECU can be used in a manual harness, yes?

I hear some people do this because of some silly notion of a speed-limiter cut not being present or whatnot? My mind was thinking that maybe this was done and perhaps the computer thinks the auto trans is still there?!?

[maj Andres]

so the car is allowed to go faster with an auto ecu on a manual transmission?

[thefro526]

Yeah it can but the OBD2 system has alot of extra diuagnostic stuff that is very temperamental.

[maj Andres]

as opposed to the obd2 on a manual transmission?

[Dattebayo]

so the car is allowed to go faster with an auto ecu on a manual transmission?

Supposedly so, but this is all hearsay as I have never been able to prove this myself or have I actually heard anything from anyone I trust about it (I'm not crazy enough to go 120+ MPH much).

Yeah it can but the OBD2 system has alot of extra diuagnostic stuff that is very temperamental.

No duh, that's what I was getting at, the manual trans doesn't have a auto-control box to guide it and an auto ECU won't know that. I betting my money on what I think here.Best way to tell is to get the number off the ECU and post it up. I'll eat my words if I am wrong.

[thefro526]

Yeah OBD2- On Board Diagnostic 2 is a system that uses signals from the engine and transmission to make it easier to diagnose problems. When something goes wrong with the system, I/E a missing sensor then the ECU spits out a code to identify the problem. The manual OBD2 ECU made for the manual transmission has inputs made specifically for that transmission so that it can be used as a diagnostic aid. The Auto ECU uses inputs from the auto transmission. In a normal (OBD1) car you can get away with using an auto ECU because it is not made to be a diagnostic system. This is all my understanding though I may be wrong

[Dattebayo]

In a normal (OBD1) car you can get away with using an auto ECU because it is not made to be a diagnostic system.

Right, they call it a OBD1 on board diagnostic system because it isn't a diagnostic system

[maj Andres]

Anyways... I've looked at the numbers on the ECU and it starts with an "A" , means it is automatic? just like on a VIN?. By the way on the ECU it says "Nissan Genuine Ramanufactured ECU"

[Dattebayo]

By the way on the ECU it says "Nissan Genuine Ramanufactured ECU"

Best way to tell is to get the number off the ECU and post it up.

[maj Andres]

The number of the ECU is AI8-E88 G94Khere's a picture of it[IMG][/IMG]

[Dattebayo]

Yes that is a automatic ECU.

Go get a manual one and then figure out your seperate neutral switch issue.