2UZ Throttle Control Dropout at High Throttle Command (1 Viewer)

FunkyYota69

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I swapped a 2uz-fe w/ A750F from a 2003 UZJ100 into my FJ80.

Everything is working great, except the throttle. I read through the APPS/TPS FAQ sticky, but I haven't found a problem that sounds quite like mine.

When I mash the pedal the throttle will open, but after a certain point it suddenly drops to idle. This is 100% repeatable.

I replaced the APPS w/ a junkyard unit a couple times - the problem is repeatable w/ each of them.

The scan tool says the TPS reading is 82.4% max. Beyond that it drops down to about 16% or so, depending on engine warm up cycle/temp.

Next steps are TPS or the throttle valve actuator, but has anyone seen this before in their J100? If so, any suggestions? Thanks in advance.
 

FunkyYota69

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Joined
Oct 6, 2019
Messages
91
Location
Colorado
Did you retain the OBD2? Can you pull codes?

Edit: Just noticed you hooked up a scan tool. Either way, it sounds like a physical issue (harness?)

I was thinking it could my my wiring job, but I didn't really play much w/ the engine side of things, I did have to make a harness for teh DBW pedal. I assume thats ok since it works until 82% pedal displacement. It might be worth verifying again.
 

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