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[bigtow]

Right as you may or may not know my car has been converted from 2.6 auto to 3.2 manual the car now has the manual ECU in it I have looked with a code reader to see about turning cruise control on but can't access the cruise ECU . What I did find was a clutch pedal switch fault ( the auto loom does not have the clutch switch wiring tucked up out of the way thanks to TB for that info ) so I was hoping I could fool the ECU into thinking the clutch switch was connected  it bridging the termals at the ECU then connect the clutch switch to the 4 pin brake light switch so cruise still disengages when the clutch is depressed . ( and take a deep breath ) can this be done or is there another solution thanks guys 

[Andy H]

Wheres the delete option.............

[bigtow]

gee thanks for the help 

[05omegav6]

Swap the ECU for an auto one. The car will run fine but you'll get a fault code for autoboc not present, no lights though

I know this works because I've had mine running on one

[Andy H]

gee thanks for the help 

Sorry, not you, me.

Had a beer, didn't read your Q properly, posted a response that that didn't make sense & now I can't delete it.

Though with hindsight "where's the delete button" is even less helpful, sorry 

[TheBoy]

Sure Matchless posted how to do it, though that may have been a 2.5 

[bigtow]

gee thanks for the help 

Sorry, not you, me.

Had a beer, didn't read your Q properly, posted a response that that didn't make sense & now I can't delete it.

Though with hindsight "where's the delete button" is even less helpful, sorry 

sorry didnt mean to snap had just got in from work and feeling under the weather man flu

 

Swap the ECU for an auto one. The car will run fine but you'll get a fault code for autoboc not present, no lights though

I know this works because I've had mine running on one

would i not have to recode all the keys ect to the other ecu and supposedly the manual ecu in it at the moment is plod spec 

[05omegav6]

I have a 3.2 auto ecu with transponder ring, chip and car pass. Only one key, but your remote would be unaffected

Are you coming along tomorrow  let me know and I'll swap mine for yours takes about half hour and no programming required

[05omegav6]

Guess that's a 'No' then

[bigtow]

Guess that's a 'No' then

pm sent

[serek]

on mine 3.2 I done same way like Matchless did on his 2.5 and all was work

[Kevin Wood]

Clutch switch connects to pin 21 of the engine ECU and is a black and blue wire. Check to see if it is present in the ECU end of the loom. If it is, my bet is that the connector for the switch will be there somewhere.

The clutch switch just pulls this pin up to the ignition switched supply from Fuse F2 (same as the common signal for the cruise control stalk switches) when the clutch is engaged.

Failing that, you could tie this signal to a switched +12v supply by the ECU and wire the clutch switch in series with the break contact on the brake pedal switch (brown and grey wire from brake pedal switch - pin 1). There may be an unintended consequence of this (i.e. ECU might need the clutch signal for something else like idle control).

Got to be better than running a misconfigured ECU?

[Kevin Wood]

Just to say, if you try the above and it works please update us on how you got on, and I'll update the manual conversion guide to include wiring information for DBW cars.

[bigtow]

thank you all for the help i will keep you updated on how i get on just one final silly question where's the ECU hidden all my previous cars have been MFL and the ECU was in the fusebox under the bonnet i have only had a quick look when i took the headlamp washer fuse out but seem to remember not seeing the ECU in that position ?

[Kevin Wood]

ECU is in that engine bay fuse box, just a good bit smaller so not as noticeable. It's just a thin ali casting mounted on a larger steel panel which lifts out of the fusebox.

You'll find 2 big multi-way connectors on it. Follow the loom leading from each. One of them crosses over to the engine cable tray and the other heads back through the bulkhead near the pollen filter. The connector on the end of the latter loom is the one you want.

You can remove the hood from the plug by removing a couple of screws so you can see what wires are connected to what pins. The pins on the connector are numbered on the base of the connector so you can count up and find pin 21 and see if it's got the black and blue wire attached.

It's possible that there's nothing connected to it on an auto loom, and maybe even no pin in the connector. If so, you're probably best just getting the config on the ECU set to auto. (I'm not sure what will happen when the ECU realises it can't talk to the auto box ECU via CAN, though). If there's a wire there you have 3 options:

1) Trace the wire back and see if you can find it emerging under the dash, then connect it to a clutch switch.

2) Cut the wire and connect the end that leads to pin 21 to the black wire from pin 47 of the ECU to fool it into thinking the clutch switch is present, then wire the actual clutch switch in series with the brown and grey wire at pin 1 of the brake light switch so the clutch will deactivate cruise.

3) Run your own wire from pin 21 into the cabin to the clutch switch.