Retrofitted CC prior and after T4

andre372 · 30th May 2014, 12:21

This is a question mostly to the T4 gurus and everyone who has retrofitted their cruise control (on diesel models). With the loom already there (simple plug and play) or with a custom made loom.
I have made my own wiring and got the cruise control working. I was under the impression that without a T4 session (which I don't have anywhere nearby) I wouldn't have full functionality and the resume function wouldn't work. However, everything is working as I think it should be including the resume function.

Quote:

Originally Posted by andre372

Second test drive done today (in town).

I didn't expect it to work that way without a T4 session.
I found a thread by bigruss42 on mg-rover.org where he describes his retrofitted cruise control funcionality prior to having the car T4'd:

Quote:

Originally Posted by bigruss42

Cruise can be enabled at 29mph.
Press master switch - no warning light on dash.
Press Res.- warning light comes on.
Press Set - Cruise set at current speed.
Repeatedly press Set - incremently increases cruise speed.
Press and hold Set - increases cruise speed until released.
Use accelerator for less than 30 secs - cruise resumes at previous speed.
Brake and clutch switches work as they should - suspends cruise.
Press Res.- suspends cruise.
Press Set - cruise resumes at current speed
Press RES. twice - cancels cruise, light goes out, can then only be reset by the master switch.

My cruise control works in a different way:

Cruise can be enabled at ~38 km/h (my speedometer over reads by ca 12% so it's actually ~34 km/h or ~21 mph).
Press master switch - no warning light on dash.
Press Set - warning light comes on, cruise set at current speed.
Repeatedly press Set - incrementally increases cruise speed.
Press and hold Set - increases cruise speed until released.
Use accelerator for less than 30 secs - cruise resumes at previous speed. (haven't tried actually)
Brake and clutch switches work as they should - suspends cruise.
Press Res. - warning light goes off, suspends cruise.
Press Res. again - warning light comes on, resumes cruise at previous speed.
etc

Can't say I'm not happy

Only one thing missing from perfect, there should be a "-" button for decreasing speed. Why did they even put the dummy middle button in there? Just so it would be symmetrical with the ICE buttons?

Cruise+ Loom Retrofit For CDT

I'm wondering if this has occured to anyone else?

Phil-T4 · 30th May 2014, 13:13

Without the correct coding the resume function doesnt work, its possible your car already has the coding for cruise!

andre372 · 30th May 2014, 13:27

Quote:

Originally Posted by Phil-T4

Without the correct coding the resume function doesnt work, its possible your car already has the coding for cruise!

Don't know how that's possible but

Simon.h · 30th May 2014, 15:22

Well done!
I fitted cruise to my 1st ZT back in 2009, it was a 2001 and did not the loom. I also made the loom up and it worked 100% as per the owners manual. It was a 160 V6.
I then removed the cruise and fitted it to my last ZT V6 190 which I wrote off last year, so its now on my 3rd V6 ZT (both had the loom fitted).

I understanding that on the V6s the only reason for having it switched on on the T4 is if there was a fault you could find by using T4 so it now looks like its the same on diesels.

pletevl · 30th May 2014, 16:42

So, how would I know if I have the loom for cruise control ?
It's a cdti 2005

Thanks
Pete.

Phil-T4 · 30th May 2014, 17:07

Quote:

Originally Posted by Simon.h

I understanding that on the V6s the only reason for having it switched on on the T4 is if there was a fault you could find by using T4 so it now looks like its the same on diesels.

No it's not the same for diesels, the engine ecu also needs a firmware update for cruise unlike the V6's.

Simon.h · 30th May 2014, 17:10

Quote:

Originally Posted by Phil-T4

No it's not the same for diesels, the engine ecu also needs a firmware update for cruise unlike the V6's.

Ok. So how did andre372 get his to work then?

Phil-T4 · 30th May 2014, 19:12

Quite possible his car was already configured for it.

marinabrian · 30th May 2014, 19:15

Quote:

Originally Posted by Simon.h

Well done!
I fitted cruise to my 1st ZT back in 2009, it was a 2001 and did not the loom. I also made the loom up and it worked 100% as per the owners manual. It was a 160 V6.
I then removed the cruise and fitted it to my last ZT V6 190 which I wrote off last year, so its now on my 3rd V6 ZT (both had the loom fitted).

I understanding that on the V6s the only reason for having it switched on on the T4 is if there was a fault you could find by using T4 so it now looks like its the same on diesels.

No it's not the same for diesels, if the coding isn't there for cruise, it doesn't work properly.

On the other hand if the car has had an ECU "set" from a car with cruise fitted, the coding will be present

Brian

Simon.h · 1st June 2014, 08:14

Quote:

Originally Posted by Phil-T4

Quite possible his car was already configured for it.

O.k. Now I understand. Thanks.

30th May 2014, 15:22	#4
Simon.h This is my second home Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG Join Date: Mar 2010 Location: Calne Posts: 4,531 Thanks: 8 Thanked 116 Times in 108 Posts	Well done! I fitted cruise to my 1st ZT back in 2009, it was a 2001 and did not the loom. I also made the loom up and it worked 100% as per the owners manual. It was a 160 V6. I then removed the cruise and fitted it to my last ZT V6 190 which I wrote off last year, so its now on my 3rd V6 ZT (both had the loom fitted). I understanding that on the V6s the only reason for having it switched on on the T4 is if there was a fault you could find by using T4 so it now looks like its the same on diesels. __________________ Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG ZT 190 2004 lpg

30th May 2014, 13:13	#2
Phil-T4 I really should get out more....... MG ZT-T, Rover 75 Tourer Join Date: Mar 2011 Location: Olney Posts: 2,969 Thanks: 245 Thanked 1,088 Times in 657 Posts	Without the correct coding the resume function doesnt work, its possible your car already has the coding for cruise!

30th May 2014, 16:42	#5
pletevl Posted a thing or two rover 75 cdti(rhd), MG ZR(lhd), MG TF(lhd), MG TF(rhd), mini mpi (lhd), Renault megane III (awful) Join Date: Mar 2014 Location: East of France Posts: 1,282 Thanks: 124 Thanked 114 Times in 93 Posts	So, how would I know if I have the loom for cruise control ? It's a cdti 2005 Thanks Pete.

30th May 2014, 19:12	#8
Phil-T4 I really should get out more....... MG ZT-T, Rover 75 Tourer Join Date: Mar 2011 Location: Olney Posts: 2,969 Thanks: 245 Thanked 1,088 Times in 657 Posts	Quite possible his car was already configured for it.