Cruise control VW TDI ALH

[fuji]

Here’s the backstory to my question:
2001 VW golf ALH TDI
My car has been swapped from automatic to 5 speed manual. All wiring appears to be done correctly, everything works, reverse lights, etc. except cruise control. When I check VCDS, the clutch and brake pedals and all cruise switches seem to indicate just fine in measuring block 06. However, there’s no cruise while driving.
VCDS soft coding is changed to 0002 for manual and Automatic TCU Is disconnected.

Here’s the question:
I noticed when the brake is applied while the cruise control is switched on I get a 17.0 in the rightmost measuring block 06 CCS field. From what i understand that field is only supposed to be 1, 0 or 255. Is this normal or indicative of a problem?

 

[Uwe]

Hi and welcome.

Please post an Auto-Scan so people can see exactly what ECU you have.

-Uwe-

 

[fuji]

Thanks, good to hear from you!
This scan was from last September when I discovered the issue:

VCDS-Lite Version: Release 1.2
Tuesday, 08 September 2020, 16:56:05:30800


Chassis Type: 1J - VW Golf/Bora IV
Scan: 01,02,03,08,15,16,17,19,22,29,35,36,37,39,46,47,55,56,57,75,76
 
-------------------------------------------------------------------------------
Address 01: Engine       Labels: 038-906-012-AGR.LBL
   Controller: 038 906 012 CP
   Component: 1,9l R4 EDC G100SG  2839
   Coding: 00002
   Shop #: WSC 01317
   VCID: 60B35BD3F35B
No fault code found.
Readiness: N/A

-------------------------------------------------------------------------------
Address 03: ABS Brakes       Labels: 1J0-907-37x-ABS.LBL
   Controller: 1J0 907 379 P
   Component: ABS     20 IE CAN  0001
   Coding: 03504
   Shop #: WSC 01317
   VCID: 3E0FC5AB296F
No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags       Labels: 6Q0-909-605-VW5.LBL
   Controller: 6Q0 909 605 A
   Component: 12 AIRBAG VW5  02   0004
   Coding: 12594
   Shop #: WSC 01317
   VCID: 351DDA871C59
1 Fault Found:
01218 -  Side Airbag Igniter; Passenger Side (N200)
            32-10 -  Resistance too High - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments       Labels: 6Q0-909-605-VW5.LBL
   Controller:
   Note: Excessive Comm Errors

-------------------------------------------------------------------------------
Address 19: CAN Gateway       Labels: 6Q0-909-605-VW5.LBL
   Controller:
   Note: Excessive Comm Errors

-------------------------------------------------------------------------------
Address 35: Centr. Locks       Labels: 1C0-962-258-II.LBL
   Controller: 1C0 962 258 P
   Component: 06 Zentr.Verriegel. 0001
   Coding: 00256
   Shop #: WSC 01317
   VCID: 341BE7831723
No fault code found.

End   --------------------------------------------------------------------------------------------------

 

[Uwe]

I noticed when the brake is applied while the cruise control is switched on I get a 17.0 in the rightmost measuring block 06 CCS field.

I've got nothing on this. I guess we'd need to ask someone with a similar ECU and working cruise check if that's normal when the brake is applied. My guess is that it's OK if you see this only when the brake is applied because applying the brake should cancel the cruise.

Let me ask this: What manual transmission did you install? Does it have the expected/correct ratios for this application? It's a known problem that incorrect ratios can prevent cruise from engaging; the ECU compares vehicle speed to RPM, calculates toe overall gear ratio from this, and if it doesn't match an expected ratio, refuses.

-Uwe-

 

[fuji]

Interesting. It is an 02J 5 speed from a pretty much identical donor car. I do have an ECU which is tuned by Malone but I can’t see that eliminating cruise control. It was tuned and manual swapped before I bought the car, so I did retrace the wiring to the ECU as that was my first suspect. Since VCDS recognizes the cruise switches it’s more mysterious.

 

[Uwe]

Have you tried toggling cruise off and back on in the ECU?

Login with 16167 to turn it off.
Cycle ignition.
Login with 11463 to turn it back on.

I don't have much hope for this, but it doesn't cost much to try.

-Uwe-

 

[fuji]

Thanks for the suggestion, i did try it without success. I made sure the letter G disappeared and reappeared in the engine component field.

 

[fuji]

Hi. After giving up on the issue last year, I thought I'd take another crack at it recently. I am still facing the same problem.
There was something that I discovered that I thought would be a sure solution.... My car was a 2001 and I had noticed that the CAN Gateway (19)
was still coded to 7 for an automatic.

I recoded the CAN gateway to 6, thinking for sure that it would fix the problem, but it had no effect.
I even re-coded the engine module to 002 (manual trans) and did the 16167 / 11463 login cycle again to try to reset the cruise control afterwards.

Again, measuring block 006 confirms that all Cruise and Brake/Clutch switches are still all reading valid as previously mentioned.
During the attempts I've made to fix this on VCDS, I managed to accidentally trigger the 65535 Airbag error, unfortunately. Does the airbag fault have some kind of override on the cruise control?

Does anyone have any suggestions of what else I can try? Is it possible that a Malone Stage 4 Tune can erase cruise control functionality?

EDIT: Assuming this isn't a VCDS issue anymore, with the 17.0 measuring block 006, perhaps this thread should be moved to Tech ?

 

[PetrolDave]

Is it possible that a Malone Stage 4 Tune can erase cruise control functionality?

I suspect that only Malone can answer that question.

 

[fuji]

I was in contact with them last year. They did say that the tune shouldn’t have an effect on the cruise.