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Stagea Rs4 Ecu, One Of My Pins Is Missing On Ecu, Wrong Pinout?

godzilla_753

By godzilla_753,
in Four Door Family & Wagoneers

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QWK32 Veteran

QWK32

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but to be clear, its possible that pin 43 isnt grounding my sensors causing them not to work?

yep, that's what i was getting at, it makes sense because of the sensors that aren't working.

I thought the tps saw 12v, sent a signal back to the ecu, and third wire is a ground (pin 43).

so this means that one of the wires on the cts is a ground and the other a signal feed to the ecu? the sensor never sees above signal voltage then correct?

Nah the tps gets 5v along with a few other sensors. There are some that get a 12v positive feed though, like the CAS, MAF and O2. I dont know what you mean by signal voltage sorry, but at a guess I'd say the positive side of the CTS is handled by the inside ECU, I'm not exactly sure how the ECU handles the signal from the CTS.

You could just place a ground on the TPS ground to test it but I wouldn't leave it like that, the signal ground from the ecu will be noise filtered to help with more accurate readings. It would be better to use the pin 43 feed, that is of coarse if that is the issue.

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DaveB Mentor

DaveB

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don't worry about the FPCM (fuel pump control module) ad dropping resistor, they are located in the rear of the car and most people wire them out anyway to help aftermarket pumps.

Sorry to get a bit OT but do you know where these are on a S2/NEO? I've had the fuel pump out and haven't been able to find them...

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QWK32 Veteran

QWK32

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Sorry to get a bit OT but do you know where these are on a S2/NEO? I've had the fuel pump out and haven't been able to find them...

the FPCM is behind the bit of trim to the right of the ATTESA fluid reservoir, sort of just behind the tail light on the drivers side, where the chrome child seat restraint hook thingies are. the dropping resistor is in the same place but on the passenger side. they are both on the back side of the steel skin in the cavity you should be able to see them easy enough. i've got some pics of them if you want them as well as a wiring diagram of the wire colours that i figured out.

Edited by QWK32
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godzilla_753 Contributor

godzilla_753

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jointconnector.png

Uploaded with ImageShack.us

this is the joint connector I was talking about. 43 goes to the ECU and provides ground to the wires on the (-) side. on the positive side of the clip on pin 4,5,6,7 i should see 12v. 48 is listed as power supply.  checked the wires on this side and this fed ignition to the TPS, didnt have time to check where exactly the other 2 wires went. but they are all grey with a blue stripe. I have a picture of the actual joint connector im talking about just in case anyones confused. Its brown, ill upload it tonight.

the joint connector is def hooked up, no wires are cut and its shouldve worked as is.

2 questions:

-does the ecu provide the ground for these sensors? I didnt see any of the (-) side of the joint connector going to the chassis. this means that the ecu grounds this connector.

-since 48 isnt providing 12v, can I cut 48 from the ecu and just provide my own 12v switched. 

in all i think it comes  back to pin 31, which is listed as ignition power supply. Since my plug has nothing there, maybe the pin was pulled out or something? could this pin be the reason why all the wires on the joint connector is not getting any voltage? I looked super hard at the plug and under close scrutiny, it seems there is a really small nick in the plastic surrounding pin31. Is it likely the pin was removed and then the wire removed from the loom? Anyone know what color the wire should be? I can try and hunt the wire by its wire color. 

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KiwiRS4T Grand Master

KiwiRS4T

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jointconnector.png

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this is the joint connector I was talking about. 43 goes to the ECU and provides ground to the wires on the (-) side. on the positive side of the clip on pin 4,5,6,7 i should see 12v. 48 is listed as power supply. checked the wires on this side and this fed ignition to the TPS, didnt have time to check where exactly the other 2 wires went. but they are all grey with a blue stripe. I have a picture of the actual joint connector im talking about just in case anyones confused. Its brown, ill upload it tonight.

the joint connector is def hooked up, no wires are cut and its shouldve worked as is.

2 questions:

-does the ecu provide the ground for these sensors? I didnt see any of the (-) side of the joint connector going to the chassis. this means that the ecu grounds this connector.

-since 48 isnt providing 12v, can I cut 48 from the ecu and just provide my own 12v switched.

in all i think it comes back to pin 31, which is listed as ignition power supply. Since my plug has nothing there, maybe the pin was pulled out or something? could this pin be the reason why all the wires on the joint connector is not getting any voltage? I looked super hard at the plug and under close scrutiny, it seems there is a really small nick in the plastic surrounding pin31. Is it likely the pin was removed and then the wire removed from the loom? Anyone know what color the wire should be? I can try and hunt the wire by its wire color.

As above G/O
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godzilla_753 Contributor

godzilla_753

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right mate, I remembered to go back and reread. I decided to dig deeper in my loom for a green with orange stripe and couldn't find anything inside the cabin. I then went to the other side of the firewall towards the engine, and found a wire that appeared to be heading into the ecu but was cut short. It is a green with orange stripe, with silver marks every 3 or 4 inches. Can anyone confirm that this is the wire? As it sits, there isnt any 12v ignition going to that wire.

Maybe someone pulled the wire out of the loom and cut it out? should i be able to see any kind of damage or knicks on the plastic connector if someone did indeed de-pin the plug? If this is the wire that should have led to pin 31 Im presuming I can put 12v ignition feed on the wiring and put it back on pin 31. Can anyone crack open their kickpanel and confirm the silver marks on the wire?

Edited by godzilla_753
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godzilla_753 Contributor

godzilla_753

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Im pretty tired of trying to get this thing running, and im sure everyones tired of seeing my posts. Im just gonna give it 12v switched on pin 31 and see what happens. Lets hope I dont burn up the computer. mellow.gif

On the other hand, I adapted a GTR intake manifold with ITB's onto my rb25 so if I do get this thing running, expect some posts and pics on that little project (assuming the thing doesn't leak).

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godzilla_753 Contributor

godzilla_753

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gave the pin power and looks like its working, pin 48 is putting out 5 volts to the tps as it should. Now the only thing wrong is my maf wiring seems to be wrong. The car runs without it plugged in, but as soon as i plug it in the engine starts to sputter and die

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