Technical Cruise control

[alexwr92]

i have a cruise control unit on my car that i have installed i have activated it on the multiecuscan but its still not working any idea why ?

 

[AndyRKett]

Most likely the wiring isn’t there for it

 

[Bernievarian]

You need to activate it in two places: ECU and steering wheel ... or as Andy said the wiring isn't there :-(

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

 

[varesecrazy]

i have a cruise control unit on my car that i have installed i have activated it on the multiecuscan but its still not working any idea why ?

Need more info..

What kit.. what work have you done?

 

[alexwr92]

In what way do you mean ? Kit ? I have a payed for version of the multiecuscan ecu scan i have activated it on the ecu but still no luck my car is a 1.9 130hp multijet i can see the symbol but it just not light up or work for that matter

 

[varesecrazy]

Just a stalk.. needing more wiring?

So MES cannot light the dash icon?

Did you perform a relearn?

 

[alexwr92]

No where to plug any other wires in mate


no mes not light the icon on the dash but says its activated on the ecu

Could you tell me what you mean by relearn i have only really used the mes to sort power steering n my airbag light out

 

[AndyRKett]

Wiring looms in cars are funny things, depending on the build can mean a different loom is fitted for seemingly the same job.

The switch on the steering column connects to the dashboard wiring loom, for cruise control to work the wiring has to be in the loom to carry the signals.

There may be no extra plugs on the switch when you connected it, you connected all the multiplugs there but were there any gaps or holes in the multi plug. I,e the plug has 10 places for a wire but only 9 of them are used.

Then the wiring has to join up with the wiring in the engine bay, this is not one full loom it’s bits that all clip together to carry the signals where they need to go.
Again if the wiring is not on the engine bay loom it won’t work.

I also remember from my old punto HGT, which had cruise control, there was a plug under the fuse box which was causing the cruise control to work intermittently, if there are extra wires that carry power from somewhere else under the bonnet, and these are missing the cruise control won’t worked.

The wiring issue is that, is the wiring from the column stitch to the engine ecu, complete and uninterrupted. If the wiring is not there 100% it won’t work.

Even if the wires seem to be there both ends, at the switch and at the ecu that doesn’t mean there isn’t still a gap in the middle somewhere.

If mes won’t allow you to test the cruise control light on the dash you have to wonder why, lack of bulb or lack of software in the body and dash computers to allow it to work.

 

[alexwr92]

Bin havein a look n the wires are there its wire 8 on the stalk plug n 40 some thing on the bcu in the dashboard but still no luck

Wiring looms in cars are funny things, depending on the build can mean a different loom is fitted for seemingly the same job.

The switch on the steering column connects to the dashboard wiring loom, for cruise control to work the wiring has to be in the loom to carry the signals.

There may be no extra plugs on the switch when you connected it, you connected all the multiplugs there but were there any gaps or holes in the multi plug. I,e the plug has 10 places for a wire but only 9 of them are used.

Then the wiring has to join up with the wiring in the engine bay, this is not one full loom it’s bits that all clip together to carry the signals where they need to go.
Again if the wiring is not on the engine bay loom it won’t work.

I also remember from my old punto HGT, which had cruise control, there was a plug under the fuse box which was causing the cruise control to work intermittently, if there are extra wires that carry power from somewhere else under the bonnet, and these are missing the cruise control won’t worked.

The wiring issue is that, is the wiring from the column stitch to the engine ecu, complete and uninterrupted. If the wiring is not there 100% it won’t work.

Even if the wires seem to be there both ends, at the switch and at the ecu that doesn’t mean there isn’t still a gap in the middle somewhere.

If mes won’t allow you to test the cruise control light on the dash you have to wonder why, lack of bulb or lack of software in the body and dash computers to allow it to work.

 

[Teirminator]

Have you changed the brake switch and the clutch switch? These are both different in cruise control models. Also what year is your car? Grande Puntos come in two series and the wiring is slightly different in little place between the two models, for example the headlight connectors

 

[alexwr92]

Thats one thing i haven't changed come to think of it
Year of car if 2006

Have you changed the brake switch and the clutch switch? These are both different in cruise control models. Also what year is your car? Grande Puntos come in two series and the wiring is slightly different in little place between the two models, for example the headlight connectors

 

[Teirminator]

Mine is a 2006 as well and i'm going to be brutally honest, you'll be lucky if you can get it to work.

In your case with the stalk not doing anything, that's because the switches haven't been changed under the pedals, you wouldn't be able to turn it off so the system will never engage cruise control.

 

[varesecrazy]

Both my 2007 model mjs fail to support cruise..

Same with my old jtd.

Often 2XECU specs one not supporting cruise.

 

[Jinx12]

Hi, i have really strange problem with my Grande Punto 1.9 multijet cruise control.

Car has Emotion pack, with oem cruise control, and alot of equipment. Last owner had problem with M32 gearbox. And he changed it with another M32 but in good condition (i think it's from OPEL/Vauxhall 1.9 cdti model).

I bought car and didn't notice that cruise control doesn't work in 5th and 6th gear. CC works in 3,4 gear but not 5,6. I didn't find solution in my region of balkans for this problem. So i saw this forum and i hope that someone knows what is problem.

Looks like my grande punto cannot recognize 5 and 6 gear ratio. My CC light works, everything works except 5 and 6th gear. I am desperate with this problem, i don't know how to resolve it. Can i learn ecu with multiecuscan to adjust or it is problem for some other measures ?

Please help. Thank you.

 

[GrandePunto PL]

"Strange" problem? Not at all.
Your suspicion is correct. Different gear ratios (so car doesn't know which gear this is - engine rpm doesn't match car speed).
MES will not fix this probably (>90% sure - I wish I'm wrong about this). This is ECU/BodyComputer (or some other module) software issue. You need some "hacker" (real-deal, not script kiddie) to modify this (tweak "memory dump").

 

[Jinx12]

"Strange" problem? Not at all.
Your suspicion is correct. Different gear ratios (so car doesn't know which gear this is - engine rpm doesn't match car speed).
MES will not fix this probably (>90% sure). This is ECU/BodyComputer (or some other module) software issue. You need some "hacker" to modify this (tweak "memory dump").

I hoped that MES would help me with this, but one person told me something like you. That i must go to some remap tuner who knows about this so he can write parameters in ecu which knows correlation between rpm and km/h. So i email all tuners around me, and even official fiat dealer service. But they all told that they don't know nothing about that.

Thank you on your opinion.

 

[varesecrazy]

I hoped that MES would help me with this, but one person told me something like you. That i must go to some remap tuner who knows about this so he can write parameters in ecu which knows correlation between rpm and km/h. So i email all tuners around me, and even official fiat dealer service. But they all told that they don't know nothing about that.

Thank you on your opinion.

Hi.

A genuine gearbox may be the easier solution

Or..

Try and find a device that misreads the RPM Signal to ECU

Cruise in 5/6
No cruise in 3/4

More useful to me

 

[AndyRKett]

i Don’t know how fiat have specifically programmed the ECU for cruise control, but old systems use to just monitor the wheel speed and then feather the Throttle to maintain the same speed. With more modern electronics it might monitor the RPM of the engine instead and look to maintain the speed of the engine rather than the wheel. But in essence the maths involved in the function of cruise control would not really need to reference the engine rpm against the wheel speed.
If that sort of maths was going on in the ECU then I’d expect to see some other problem like the car thinking there was an ABS fault or similar. I’d be checking to make sure the gearbox was properly installed, sensors maybe not recognising a gear is engaged or the clutch switch not operating properly when in a higher gear, maybe because the different gearbox isn’t feeding back to the pedal properly with the higher speeds.

I’ve not checked the clutch switch on a fiat but on other cars they are easily reset by removing the switch and pulling the plunger out fully before refitting the switch, that’s what I’d do first.

 

[Bernievarian]

Would make sense if engineers designed the Cruise Control in such a way that it controls the engine RPM vs the wheels speed to detect slipery clutch; which condition would require the driver's attention, i.e by disconnecting the CC ...
Maybe the ABS is doing this check, amongst other like wheel to wheel RPM mismatch ?

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)