Strange cruise control problem

well thats just it, its not registering a clutch fault code, just the e45 cruise intermitent fault, 25-10

but it wont pick up the clutch switch in 006 measuring blocks

 

i think software code 00002 (which is what it is set to) is for a manual ecu, m1ke told me to set it to that.

Driving me mad this is, sat in the car as we speak, coffee on the go, wires everywhere, laptop perched on the dash. lol

Iv been trawling the net for a pinout for my ecu, i know that pin 17 on my old ecu is the clutch switch signal feed, and 33 is the ground for it, and when i hook the old ecu in, the clutch pedal comes up on measuring blocks.

 

legend, cheers

 

well i have rulled out pin 17 and pin 10 for the clutch signal feed on the ecu, struggling to find if there are likely to be any other pins on the new ecu to try.

Im convinced its all down to having no clutch switch signal.

 

Hmm it could be that the clutch switch needs to go to ground instead of getting a 12v feed or the opposite one of those options. Can you do a video of how the switches work with your old ecu too?

 

See what you make of this.....





Video is in 2 halves, my iphone would only email a certain size of video at a time.

See how that compare to the first video i took with the new ecu

 

Did the clutch switch work at the end of that video?

 

yes it did sorry, it works fine on the old ecu (in the video)

 

ok rubjonny il take a look

 

I still dont understand. I need a pin out for the new ecu, im convinced the original pin 17 on my old ecu isnt the same as the new one for the clutch, and it appears that the mk3 golf loom earths the brake and clucth switches back to the ecu.

 

I think i've got my head round this, The clutch switch pin 17 needs to see 12v when the clutch isn't pressed and nothing when the clutch is pressed. So what you need to do is change the feed into the clutch switch to be a 12v feed instead of a ground.

 

so just to clarify, you think that pin 17 is a reciever in the new ecu, rather than a sender. So on the old ecu, when the clutch is pressed, the switch breaks contact between pin 17 and ground, so the ecu knows its an open circuit and therefore clutch is pressed.

So if i mock up a 12v feed into 17 on a push to break switch. It should work?

 

The clutch switch you have at the moment should work as a push to break switch if autodata is to be believed.

 

Heres what i have from autodata.

Golf AF ecu pinout
https://docs.google.com/open?id=0B2YUpJEMHSDrY2Q1N2UwM2MtMzZmOS00ZDAxLWE3YTUtYzg2NGIxM2YzYTJm

Audi GM ecu pinout
https://docs.google.com/open?id=0B2YUpJEMHSDrZDEzOGNiZGMtZGM1Yy00MGIyLWE2MWEtZjExZTg2NWVkZmFl

 

Yes thats right, its a connected circuit with the clutch not pressed.

 

So it is the same ecu pin on both then? Pin 17?

 

Also I think the brake pedal signal from switch 2 is also going to need changing to give pin 20 at the ecu 12v when the pedal isn't pressed and then break to 0v when it is pressed.