I've read a few threads from way back (2005) about a possible faulty TPS. I have a 2002 so my TPS is a 4 prong not a 3, thereby making it not replacable unless I buy a entire new Throttle Body (TB). These are the symtoms:

No SuperCharger

At just under 300,000 miles

2002 4Runner Automatic

Slipping or failure seems to occour after 10 miles of driving in the city.

Slipping or failure used to just be dropping and surging betwn 38mph - 49mph.

Now the surging happens when at idle, 500 RPM up to 700-900 RPM

No codes have been thrown other than my standard ones that indicate a failed fuel thingy PO440, PO446.

I'm in FL so it is getting warmer hear.

Part number is 89452-35030 and is not supported through Toyota with a replacable part only a full Throttle Body. The part number ending in 030 like I have onboard is a 4 pin connector and a replacement ending in 020 for earlier models will not work because it is a 3 pin model.

I have found a few TPS's on ebay with 4 pins but am not 100% certain about compatibility.


Help.

Aaron
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Funny how Toyota snuck in a few of these outrageously priced parts on 01-02's. The master cylinder being another one.

I would try junk yards and part outs first.

Hopefully this link works for you. If not just enter in your info and see what comes up.

Search Results

Edit: yep the link is dead, just go to www.car-part.com

have you actually tested the TPS?

After reading the extensive thread on TTORA it doesn't help to test it. I
have a digital tester and a needle type is best. But even then when the unit fails since it is sporadic sometimes best of luck lining up the results. I'm not throwing codes but revs are revvy. Even as I sit here I'm floating a bit. Thinking back I did get a new alternator and according to said TTORA thread resetting the ECU or changing anything electrical can trip the memory up a bit. Which might explain why this problems seems to have gotten worse.

I've always found that spending a few bucks on tools/test equipment was a much better long term investment than throwing money at parts that may or may not be the problem.

Either way good luck in getting it fixed

It is certainly not that I'm cheap and not willing to purchase more tools...c'mon can you have to many tools? The problem is not which tool it is how to find the failure. You can test the resistant all you want but the hiccup may occour and it may not. The only thing that has seemed to 100% is to have a Toyota Tech with you while driving and the unit fails.

It is my understanding that tweaking or changing the current setup will have adverse effects. More over there are more things to consider than the TPS as there is also the accelerator pedal position sensor. You can mess with both but cannot replace either without the other as they are tuned together. There is lies the issue as to why the entire thing has to be replaced. Earlier setups wasn't such a big deal (3-wire version).

This seems to be an issue of when it goes it goes and not just throwing money away.

Anyone else suffered the expensive replacement mod from a 01-02
4Runner...... and 02-04 Taco's I think.

A

That throttle body is actually one of the reasons I bought a 2000. As far as testing with an intermittent problem if it were me I would probably test with a scan tool that offered data logging. I have both:

AutoEnginuity® - OBD2 Scan Tool - Professional PC and PDA Diagnostics

and

Innovate Motorsports OT-2 - Transform your iPhone or iPod into a wireless gauge, data logger, dyno, efficiency meter and OBDII scan tool. the earlier version of that. Either of them would log that signal while the innovate piece could actually be attached to their "aux" box that would allow me to tap in directly at the signal and monitor it in real time if the need arises. Neither is cheap but both are cheaper than Toyota diagnostic fees, and both a cheaper than that throttle body is new. At worse case I would think you could put a multimeter on the dash and run some wires temporarily to monitor the signal while driving.

Great ideas all three, the surging hasn't gotten to God awful yet so I'm game with collecting data and triple checking.

Thank you

I picked up a throttle body from a 2000 4runner on car-parts.com for $140, seemed to fix the problem.

Aaron,

I am having issues out of my 2001 4Runner as well and we need to change the tps (89452-35030). How did you put a throttle body from a 2000 on there? I would assume you had to change the wiring in your truck somehow to use the 3 pin connector rather than the 4 pin. Basically im wondering how in the world you got the setup to work.

Thanks,
Brandon

Brandon,

99-02 should all be the same.

XC, are you sure car-part didn't send you an 01 throttle body? From what I've always heard the 01-02's were completely different animals. The VSC and drive by wire didn't start until 01 correct?? I think that's when the big changes to the throttle body and master cylinder took place.

whatever came of this bud? i thought we lost you to expo forums for good, haha

As far as I know that is correct as well. I can only say for sure that the 00 that I have is not the drive by wire, and has the aux cruise control unit, etc. Every picture of an 01 Engine bay that I have seen has the cruise control obviously missing so either it didn't have that option (which i don't think was actually an option to not have) or it had the drive by wire throttle body.

If the TPS has 4 wires its a drive by wire , 3 wires and its an older unit.