FZJ80 - TPS (throttle postion sensor) questions (1 Viewer)

[Trux]

About the TPS (throttle position sensor)-

Ive been testing/ adjusting the TPS per the manual since the truck started stumbling idle, harsh shifting points etc.

But- no matter where i position the sensor during or after the procedure described in the manual- the truck wont idle correctly without the AC on. It will stay at 900rpm with ac on, with occasional drop to 600 or below when ac cycles.

If i turn the ac off it drops to about 400 rpm and wants to stall. The tps sensor itself looks brand new.

The ohm readings i get are somewhat along the lines of the manual and what others show the ohms moving gradually from 1 -3 , no continuity to 3 ohms or however it goes. Maybe im not reading it correctly?

I got it to where the truck was running ok, not perfect- and then tried moving the sensor ever so slightly each way to adjust to perfection- but it never gets anywhere near perfect idle without the ac on.

Whats the trick? Why cant i find the setting even though i slowly moved the tps sensor throughout the entire adjustment range with no effect.

No , there are no vaccum leaks. Was thknking maybe the MAF sensor went out- have another that known to work i could try testing- but my land cruiser specialist said he definitely thinks hinks the tps is the main problem and just get the right setting (free advice- he tries to save me money by leading me in the right direction on the easier to fix problems)

 

[Trux]

Oh yeah, AND IM AT MY WITS END!!!!!!

That helps get allot of attention, right?

 

[elhombre]

Has it ever run good or did you just get the truck and it had this problem? Any codes?

I would check the shift linkage at the throttle body to make sure it is just tight enough not to have any slack. Assuming it is new to you, maybe someone took it off and didn't get the adjustment right. Second, is the throttle body clean? The TPS may be correct, while you have crud built up in the IAC air passages.

 

[unklwedy]

With the TPS adjusted properly 2 of the contacts should have continuity, telling the computer to engage idle circuit and idle air motor.

 

[YoGotti94]

Hi i know this is an old thread but did you ever figure out the issue? I am experiencing similar symptoms and my mechanic told me the TPs was shot. I just ordered one and would like to install and adjust myself.