TPS limited on cruise control?

[dpetersen]

Gday all, wondering if someone can shed some light on this
With cruise control set at 100 the patrol generally stays at 100 except for the odd larger hill.
While towing the trailer speed decreases at some pretty small inclines.
I had the ecu talk plugged in today and noticed that while on cruise control the throttle position does not go above 73%, if I then put my foot down I can keep the car at 100 pretty easily most of the time.

Is there a way of disabling the tps limit while on cruise control?

Gu iv 4.2tdi


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[jff45]

There's no TPS limit with cruise control. The TPS reading on the Ecutalk, assuming the TPS is correctly adjusted, is only an indication of how much the cruise control cable is pulling on the throttle lever.
If you action the accelerator pedal to pull the throttle lever exactly the same amount as the cruise control does then you'll get exactly the same reading.

Personally, I don't see any advantage to having the TPS reading in %. If you change it to volts in the Ecutalk options, you can then check if it's correctly adjusted to factory spec.

[dpetersen]

There's no TPS limit with cruise control. The TPS reading on the Ecutalk, assuming the TPS is correctly adjusted, is only an indication of how much the cruise control cable is pulling on the throttle lever.
If you action the accelerator pedal to pull the throttle lever exactly the same amount as the cruise control does then you'll get exactly the same reading.

Personally, I don't see any advantage to having the TPS reading in %. If you change it to volts in the Ecutalk options, you can then check if it's correctly adjusted to factory spec.

So if I’m at idle it shows 0%, foot flat it shows 99%, personally I find it easier than volts.
So going up a hill with cruise on, the tps won’t show more than 73% or roughy 3/4 throttle so there’s still a bit to go but the cruise won’t allow it to go that high, if I put my foot down it’ll maintain that speed no worries.
So why won’t the cruise control allow the throttle position to go above 3/4 throttle?


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[jff45]

I just don’t understand why a driver needs a visual indication of how far they’re pushing on the accelerator. The voltage reading is an indication of the correct TPS adjustment.

You could maybe check to see if your cruise control cable is correctly adjusted or if the throttle lever spring is too strong for the cruise module capability

[dpetersen]

I don’t need a visual indicator of the throttle position at all. I had it plugged in to keep an eye on coolant temps and noticed it while driving and assume this is the reason why I can not maintain 100k/ph up hill while loaded with the cruise on.

Any idea on how to check those things?


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[the evil twin]

Assuming the throttle actuator servo is capable of 100% pull (as jff45 mentioned) then you will need to check for play/excess slack in the servo linkage.

A proportion of Cruise Control setups out there won't give 100% throttle and a large application of throttle input by the driver or excess drop below the set speed will trip the CC out into standby as a safety measure. Not saying that is the case in this instance as I never had a TD 42 with factory cruise.