Is anyone out there able to tell me which wire I connect the cruise control's speed sensor wire to? I have a manual 3L TF Exec and have no idea which wire under the dash or going into the ECU is the speed sensor wire. Can I use the speed alert wire? As you see I have no idea. I'm a sheetie, not an auto elec. Also does anyone have a link to a downloadable wiring diagram for my '98 TF and maybe the Command AP150 cruise control unit? I got it out of a wrecked car so I have no manual and can only find other model instructions on the internet. Any help would be much appreciated.

After market cruise controls are a nightmare, especially a second hand one without wiring diagrams. If it came out of a car similar to yours, it would have been a good opportunity to carefully check how it was wired up before you removed it. Too late now though. Even if you were an auto electrician, you would still need the wiring diagrams.

Bought a second gen V6 with aftermarket cruise on it, first thing I did to the car was to remove and junk it. Wasn't working anyway. lol

Hope you have better luck.

A few aftermarket cruise control kits available on eBay, maybe contact one of those sellers and they may be able to email you a copy of the AP150 wiring diagrams?

Might be able to see the wiring when I go to work monday. It came out of one of the "donated" cars the firies get to use the jaws of life on and then burn for fire fighting practice. The guy in charge said I could get what I want off it. It has the same engine as mine and was drivable the other day until they cut the crap out of the pillars and other parts of the car. Even though I didn't look under the dash the wires pulled out of the places they were soldered to so I might still be able to see where they came from.......hopefully. Good idea with contacting an ebay seller MadMax, I did think of that so hopefully one of the sellers is in a generous mood.

Email Command and see if they will help you. there is a diagnosis pdf there online may be others if you search

http://www.tcag.com.au/index.html

Head along to your local Autobarn store. They should be able to help you as they stock tese.

Without a wiring diagram for the TF, I can't give you exact advice, but I know as a default the gearbox has a speed sensor, so if you can't isolate the speed sensor wire inside the cabin, then you go straight to the gearbox speed sensor.

Otherwise it'd be in the wiring into the cluster harnesses. You could blind test for them by lifting the front wheels off the ground, and using multimeter on each of the pins in the harness, check which pin has a pulsating signal when you accelerate - best would be to set the cruise so that you have a steady speed.

The VSS in the gearbox has less wires than the cluster harness, but it's anyone's guess which is the one that sends a signal to the ecu & cluster. You'd need to probably buy an old manual to find out.

i recently had to fix one of these. The information was only available through their tech support which is apparently only for approved installers (thats what they tell us anyways).

iirc (i do have a copy of this at work but i wont be back there until 24/4)
the speed sense wires are the twincore blue and black wires of which in your application only the blue is needed
there is also a yellow wire for tacho sense, which is useful of you vehicle is manual, and must have the noise supressor still attached to be used.
green is earth.
orange is ignition supply.
purple is used for clutch switch on manual (earth sense).
the figure-8 brown wires are for the stop light switch (one to input and the other to output)

if the tf uses the same colours as later models then you will want the white/blue wire at the diagnostic connector/instruments/speed alert. LED test lights and jack stands are your friends when confirming speedo pulse.

I have a feeling the earlier models MIGHT have been either red/black or black/red in the diagnostic plug. I can check this as i have it listed in a book in the garage if you are in trouble.

i recently had to fix one of these. The information was only available through their tech support which is apparently only for approved installers (thats what they tell us anyways).

iirc (i do have a copy of this at work but i wont be back there until 24/4)
the speed sense wires are the twincore blue and black wires of which in your application only the blue is needed
there is also a yellow wire for tacho sense, which is useful of you vehicle is manual, and must have the noise supressor still attached to be used.
green is earth.
orange is ignition supply.
purple is used for clutch switch on manual (earth sense).
the figure-8 brown wires are for the stop light switch (one to input and the other to output)

if the tf uses the same colours as later models then you will want the white/blue wire at the diagnostic connector/instruments/speed alert. LED test lights and jack stands are your friends when confirming speedo pulse.

My AP150 has a blue speed sensor wire with an outer black sort of like a dual core wire. Do you know if the black's needed or is this only for when a magnetic pick up sensor is used on a shaft? One brown has a single white stripe and the other brown has (cant remember unless I go out to the car) two white stripes. It came out of an auto and only one brown had solder on the end where it was connected to the car. I'm assuming they used a manual kit in an auto?

I can check this as i have it listed in a book in the garage if you are in trouble.

If you could it would be a big help.

The blue only is needed for the VSS wire. The black is not required unless you are connecting to magnets. The brown wire will need to go to the brake light switch so the cruise will shut off when you apply the brake.

Without a wiring diagram for the TF, I can't give you exact advice, but I know as a default the gearbox has a speed sensor, so if you can't isolate the speed sensor wire inside the cabin, then you go straight to the gearbox speed sensor.

Otherwise it'd be in the wiring into the cluster harnesses. You could blind test for them by lifting the front wheels off the ground, and using multimeter on each of the pins in the harness, check which pin has a pulsating signal when you accelerate - best would be to set the cruise so that you have a steady speed.

The VSS in the gearbox has less wires than the cluster harness, but it's anyone's guess which is the one that sends a signal to the ecu & cluster. You'd need to probably buy an old manual to find out.

This will be my last resort I think. Didn't know the manual had a speed sensor in the g/box, thought it was only an auto only thing? I did suspect this but wasn't sure. I'll have a look for it today. Bit of mowing then maybe take the kids fishing is on the priority list today though. I'm easily distracted by other stuff.

My trusty little cruise control book tells me the VSS wire for TE is white with a blue trace at the ECU. If there is one with those colours at the diaagnostic plug under dash on drivers side close to the console, then that is the same wire. Otherwise you will have to pick it up at the ECU.

Thanks heaps Tee Jay. I'll check it out.

My AP150 has a blue speed sensor wire with an outer black sort of like a dual core wire. Do you know if the black's needed or is this only for when a magnetic pick up sensor is used on a shaft? One brown has a single white stripe and the other brown has (cant remember unless I go out to the car) two white stripes. It came out of an auto and only one brown had solder on the end where it was connected to the car. I'm assuming they used a manual kit in an auto?

the kits are universal so they can be fitted into either manual or auto. The brown wires are wired across the stop light switch, and it doesn't matter which way.
dont forget to fit a clutch switch on the purple or the engine will rev into oblivion every time you engage the clutch.
if the noise suppressor is still present on the yellow wire then that can be used for over rev protection also.... but will need the dip switches to be set correctly (yet again i have a copy at work)

the kits are universal so they can be fitted into either manual or auto. The brown wires are wired across the stop light switch, and it doesn't matter which way.
dont forget to fit a clutch switch on the purple or the engine will rev into oblivion every time you engage the clutch.
if the noise suppressor is still present on the yellow wire then that can be used for over rev protection also.... but will need the dip switches to be set correctly (yet again i have a copy at work)

There's no purple wire. Maybe it's missing on this particular AP150? I might have even ripped it out when I oh so carefully removed the wires from under the dash. The only yellow wire is one of the three that go from the control stalk to the cruise control box.

Just an update, there is another yellow wire from the control box to the vacuum puller thingy. Another question, is the white with blue trace wire in the plug on the far right side of the ECU the speed sensor/pulse wire? It goes into pin #16 on that plug which has 22 pin locations. Unless the unit is funked up then it should work as a speed sensor, right?

Correct

I think maybe the unit's rooted. just went for a spin and nothing happened no matter what I did. Going back out there to stuff around with it again.

could also need calibration (dip switches).
have you run diagnostics on it?

print out this document (http://tcag.com.au/documents/AP150%20Diagnostics.pdf) and run through the procedures.

Thanks Ash. There's no way I would have known about that. I was wondering what the red light was doing and if it needed to stay on or not? I gave up on the cruise earlier today and started ripping out everything needed to get to the heater core. What a prick of a job that is especially with a still healing left wrist, shoulder and collar bone. Looks like I'll be driving to work tomorrow with a fair bit of crap missing.

New heater core seals, all back together, cooling system flush, new coolant and we're ready to hit the road again. Woohoo, I've got a heater for these colder mornings! Have to say once again, what a prick of a job getting to that heater core.

i'm back at work on Wednesday so i can send you the install instructions if you pm me with an email address

Thank's heaps Ash. I'll PM you.