sr20 harness. what is this plug? next to ecu & dash connector

[redsx13]

Most of the sr harnesses i have seen dont have this connector (like the one on fr sport). A/C maybe?.(the plug is wrapped in some kind of foam if that helps at all.)

[vocationalzero]

I think it goes to the blower motor. But there is a plug up under the dash in the front pass. corner that will have the other side to it. It is a direct fit plug, it will just take some energy to make it snap together cause there is little room to move and work with your hands and little slack in the wires.

[SpeedRacer1]

That should be for an auto transmission computer. The blower wiring is on a different harness.

[Hijacker]

That should be for an auto transmission computer. The blower wiring is on a different harness.

Nick's correct. The blower motor is on the main dash harness

[redsx13]

so its for an automatic transmission? . cuz the cars not an auto. is there any way to tell if the car was at one point? (the car is a s13 clip from japan)

[Hijacker]

Someone may have done a 5 speed swap on your donor car or something. An auto trans EFI harness will run a manual car fine.

It could also be that the day the car was assembled, there were no manual EFI harnesses in the bin, so someone grabbed an auto harness and used it instead.

[redsx13]

Someone may have done a 5 speed swap on your donor car or something. An auto trans EFI harness will run a manual car fine.

It could also be that the day the car was assembled, there were no manual EFI harnesses in the bin, so someone grabbed an auto harness and used it instead.

is there a way to check if at some point in its life the car was an automatic?

[Hijacker]

Is there an automatic trans control unit above the ECU? And does the main chassis harness have the same plugs on the side of the engine bay fuse box that an auto car would have?

I highly doubt you got a converted car, it's just a fluke that the EFI harness was an auto harness.

And I'm pretty sure Nissan made an auto harness and a manual harness. I remember pulling EFI harnesses, and bitching only when I was pulling ones for autos out (that foam wrapped plug ALWAYS snags on something)

[redsx13]

[QUOTE=Hijacker]Is there an automatic trans control unit above the ECU? And does the main chassis harness have the same plugs on the side of the engine bay fuse box that an auto car would have?QUOTE]

no, the car has no auto control unit. but it does have another strange plug connected to the chassis, rite next to where the ecu would go. The plug is big and looks just like the one for the main ecu, but a little shorter.

another question, can i just strip out all the wires that went to that plug. got my harness apart and i want to get rid of some confusion.

[Hijacker]

That plug sounds like the plug for the ATCU. I know the cruise control box is near the same spot as the ATCU, but it uses a much smaller plug than either the ATCU or the ECU.

You can strip the wires out if you want to since you have it apart. You won't hurt anything. They should run from that plug to the ECU.

[redsx13]

Its really strange that the car has that plug cuz i dont think the car was converted either. here are some reasons why not.

1. stock nissan clutch2. stock nissan master c3 stock nissan slave c4. all plugs to trans took to be un touched5. transmission looks like it has never come off

[Taylor_Durdan]

well, if they did the auto to 5spd swap correctly, then you will have all those things.

best way to tell if it was an auto motor originally and the TPS sensor. if its a 6 wire TPS, then it was an auto. if its a 3 wire, then it was a 5spd motor and they just sent you an auto harness with the motor. no biggie, same plugs and whatnot besides the TPS.. which isnt hard to wire up for a 5 spd TPS.

BUT... you need to make sure that if it WAS an auto motor, that they removed the large steel insert in the rear of the crank shaft and installed a pilot bushing. if not, your transmission will have a severely shortened life and make tons of noise

[redsx13]

well, if they did the auto to 5spd swap correctly, then you will have all those things.

best way to tell if it was an auto motor originally and the TPS sensor. if its a 6 wire TPS, then it was an auto. if its a 3 wire, then it was a 5spd motor and they just sent you an auto harness with the motor. no biggie, same plugs and whatnot besides the TPS.. which isnt hard to wire up for a 5 spd TPS.

BUT... you need to make sure that if it WAS an auto motor, that they removed the large steel insert in the rear of the crank shaft and installed a pilot bushing. if not, your transmission will have a severely shortened life and make tons of noise

Well i just checked the thing out and its a 6 wire TPS. o well... do u think that could have n e thing to do with the fact that the car runs like ****? I mean undriveable. Its really rough and has a high idle.

[positron1]

My car was a auto to manual swap and I noticed that plug there when I pulled my KA.

[Hijacker]

There are plenty of people who run auto harnesses on manual converted cars, so your problem is more likely to be a different issue.

A high idle makes me think it's a bad IACV. When you say it's really rough, what exactly is it doing? Bogging badly? Is it pinging? Are you blowing smoke out the tail pipe?

Tyler, I don't think a manual trans will bolt up with the auto insert still in the crank. The inner diameters are different between the auto insert and the pilot bushing. And the nose of the input shaft sits inside the pilot bushing.

[redsx13]

There are plenty of people who run auto harnesses on manual converted cars, so your problem is more likely to be a different issue.

A high idle makes me think it's a bad IACV. When you say it's really rough, what exactly is it doing? Bogging badly? Is it pinging? Are you blowing smoke out the tail pipe?

Hijacker,

Its a really strange situation, and im desperate!! If you have time, please check out my thread!!.(the link to it is on my sig). it seems like you have alot of expirence with different problems.

As for the roughness, no pinging, no exessive smoke, but it will bogg for a second when you give it some gas. other than that, it runs fine in the high rpms. If i had to describe the roughness at idle, it feels just like a sparkplug wire or injector is unplugged. but all cylinders are fireing. I was then thinking timing, so i loosened the CAS and turned it w/o removing it. only thing that did was raise the idle up and down, but it still had the same roughness. then I was thinking TPS so i unplugged it nothing happend, the car diddnt run any different, even when the motor is revved up. (is that correct??) Then i was thinking 02 sensor, so i unplugged that and again, nothing happened (is that also correct??) this may be an unrelated problem, but i also have really really low boost (around 1-2 psi) and it smells like its running rich.

[Taylor_Durdan]

oh trust me hijacker, it bolts up. the torque converter has a much larger diameter on its 'input shaft' than the manual transmission does. so it will all bolt up, but nothing supports the end of the manual input shaft which destroys the input shaft bearing over time and makes a very odd squealing noise when engaging the clutch. i cant tell you how many times i have had to repair this situation due to someone elses ignorance

[Hijacker]

Ahh! I had the diameters backwards in my head. I was thinking the auto trans used a smaller diameter input shaft.

[LayNLow240]

Could have been thinking of the KA, the auto trans bushing is a smaller diameter than man trans.