TDI & cruise

[rodpaslow]

I have a 99 MK3 that has cruise (current 2.0 gasser), and I would prefer being able to keep it when I install the TDI.  I know TDI cruise is much different, I don't have the option of swapping it from my parts car as I'm going MTDI.

Would all I need to figure out is where the system needs rpm and vacuum and run these services to those specific places to get it to work, or are there other problems that it just can't be made to work?

[vanbcguy]

If you are going M-TDI then you actually can just leave everything as is, there's nothing that needs to be changed at all.  The cruise system has its own vacuum pump mounted  between the inner and outer fender behind the battery.  The vacuum servo is mounted under the dash to the top of the accelerator pedal.  Absolutely nothing interacts with the engine in any way on the AAZ / 2.0 cruise system.

e-TDI on the other hand runs the cruise through the ECM.  That requires some wiring changes.

[rodpaslow]

Awesome!

[rodpaslow]

I've looked on the forum, and have more issue to resolve - I have a gasser ,99 golf, that will be getting a 1Z transplant (above).

I want to use the tach that it already has.  (many post about changing it).  I know I can use a Dakota digital converter or other to provide the signal.

Question I have is how do I get that signal to the tach?

Isn't the wire that gives it a signal now(gasser) from the negative side of the coil? Is this the wire I connect the signal wire to?  Or do I have to pull the connector off the gauges in the dash, and find which wire is the signal wire for the tach?

thanks!

[rodpaslow]

"Crankshaft position sensor of a VR6, found the pinout online and is like this

with the two notches pointing up terminals are 1 2 3
1: 12v input
2: tach output(here you connect the tach)
3: ground

so as instructed you have to provide the 12v( better to be switched, so take it from the shut off solenoid), the ground from wherever and send a cable from the tach to the #2 terminal on the plug of the CPS.

add two nuts to the damper, welded glue whatever you like, build a bracket and that's it"


My TDI has a crank sensor, will above work for stock gasser tach?  Even if I have to adjust it with a dakota digital unit or something like that?

[vanbcguy]

The AHU sensor I used was definitely different. It has 2 ground pins (one was connected to the body of the sensor, the other was the signal ground) and a signal sink pin. Not sure what the ALH one would be like, I suppose they might have changed it. But there is definitely no +12v going to my sensor at all. Basically the AHU one provides varying resistance to ground when there is a gap in the "tone ring" on the crank. On its own it is about the opposite of what a tach would want.

The VR6 is a totally different electronic platform though so they easily could have used a 12v trigger rather than a ground sink.

Sent from my HTC One XL using Tapatalk

[rodpaslow]

Yeah, mine is out of a passat, 1Z so I assume similar to what you have said.  Have you posted on your build how you did it?  I'm at a loss at the moment how to do it, prefer using the vw gauge without have to go to an aftermarket one...

[vanbcguy]

Yeah I used a conversion circuit I found on line. Wasn't very complicated, about $10 in parts. It outputs a 5v pulse but that could easily be raised to 12V with an additional transistor.

Sent from my HTC One XL using Tapatalk

[CRSMP5]

Also..... If throttle springs too hard, vac ball will not hold throttle open, rover and cummins like bbob used throttls springs too hard for it to give throttle... Much more effort then old 1.6 ones

[rodpaslow]

My throttle spring didn't seem any harder than the 1.6 but I could be wrong.  I could always counter that with and extension spring providing some tension the other direction if it can pull hard enough.

I've purchased an aaz gauge cluster  (person gaurantees me it aaz) and I will likely replace the gasser one and just use the W terminal.  I looked in my bently book yesterday and it looks like I can just use it for the tach and possibly need to pick up a dakota unit to adjust it.   I'll have to see once installed.  I have my fingers crossed that the connections all work with a diesel cluster.

[CRSMP5]

Do not forget, 120a alts do NOT have W built in.... Gotta mod it, get rair eurovan or 90a alt...

[vanbcguy]

Error. I have a 120A alternator with a built-in W terminal on my car right now.

Bosch AL0184X. Came on some AAZ cars. And apparently quite a few gassers.

Sent from my HTC One XL using Tapatalk

[rodpaslow]

I have two 120's, one from a passat diesel TDI (i imagine no W) and one gasser - (may have W not sure?).   In any case, there was a member that provided me with a second option to use a, I think ford, sensor/pickup and add it to my power steering bracket and mod two bolts that mount the pulleys.  the bolts pass by the sensor and create a low volt 1.9v a/c square wave.  I'm hoping a 99 gasser tach will accept this. So even if I don't have a W-type alternator this may work.

[rodpaslow]

I may have an aftermarket cruise someone decided to put in using the cruise handle the car came with.  It has a different actuator with cable and a plastic case and controller that was connected, but loose in front of the fuse panel. (currently doesn't work)

I need to see what's left of the vw cruise parts in the car and get what it came with working.  I haven't looked, but I hope the controller, pump, and actuator for the pedal are all still in the car.  I've seen online the relay tends to stop working on oem, that may be a bit tedious to change.  If I can't do it I can likely get a electronic store here to change it. 

[vanbcguy]

Actually the relay on the OEM one isn't the problem in most cases. The real issue is cracking solder joints on the circuit board.

Module Masters (I think that's the name) have a reasonable price for fixing them, their repairs are solid.

 I just resoldered all the affected joints on mine about 2 years ago, it has worked perfectly since then. There's about 8-10 capacitors on the board that crack their joints due to cheap solder and thermal stress.

Sent from my HTC One XL using Tapatalk