TPS limp mode, now OK, fix or not?

[TLCSKULLS]

You sure about that? My understanding is that the TPS is a job, accessible from the outside, but the APPS is a job, requiring the removal of the throttle body because it is internal. Mine cost about $700 total at the dealer, with a TB cleaning as well.

Didn't have to remove the thtrottle body. I removed the air filter assembly for easy access to the side of the throttle body, took off the APPS and put on the new one.

 

[SINCITY100]

OK... Here`s the skinny on the 98-2002 100 series TPS, APPS, and Throttle body
assy. ( well, at least as far as I can tell ;p )


It looks like the `98 model was the worst year overall

The `98 TB assy was changed for the `99 model year with an "updated" part#.

Then for the`01 model year, the TB assy was again "updated" to its current part# ( FYI , this `01- update fits ALL `98 -`02 model 100`s)

I`m not sure exactly what Toyota changed with these "updated" parts , but here`s what else happened during the years previously described..

In May of `99 , the APPS (aka "throttle lever assy w/sensor") was updated as well. ( this also fits ALL 98-02 100`s )

An interesting note:

The TPS has never been "updated" (or at least thats been reflected by a part# change)

Various other items under the 100`s hood have also been updated through `01-ish model years. This means (IMO) that `01 or newer 100 owners have very little to worry about when it comes to the TB (or many other things for that matter) when it comes to reliability. But of course, EVERYTHING changed again in 03 with the "drive by wire" set-up, so we will just have to see what happens with the newer models

These running changes are quite common, as Toyota ( and I assume other mfgrs) find less-than-desirable performance or durability issues over time with a part(s).


So, I guess that any currently dealer-available APPS/TB assy is going to be good to go for a long time after one replaces the original part.


So... did this rhetoric of mine clear up anything guys ?

 

[spressomon]

OK... Here`s the skinny on the 98-2002 100 series TPS, APPS, and Throttle body
assy. ( well, at least as far as I can tell ;p )


It looks like the `98 model was the worst year overall

The `98 TB assy was changed for the `99 model year with an "updated" part#.

Then for the`01 model year, the TB assy was again "updated" to its current part# ( FYI , this `01- update fits ALL `98 -`02 model 100`s)

I`m not sure exactly what Toyota changed with these "updated" parts , but here`s what else happened during the years previously described..

In May of `99 , the APPS (aka "throttle lever assy w/sensor") was updated as well. ( this also fits ALL 98-02 100`s )

An interesting note:

The TPS has never been "updated" (or at least thats been reflected by a part# change)

Various other items under the 100`s hood have also been updated through `01-ish model years. This means (IMO) that `01 or newer 100 owners have very little to worry about when it comes to the TB (or many other things for that matter) when it comes to reliability. But of course, EVERYTHING changed again in 03 with the "drive by wire" set-up, so we will just have to see what happens with the newer models

These running changes are quite common, as Toyota ( and I assume other mfgrs) find less-than-desirable performance or durability issues over time with a part(s).


So, I guess that any currently dealer-available APPS/TB assy is going to be good to go for a long time after one replaces the original part.


So... did this rhetoric of mine clear up anything guys ?

Thanks Lee! That is helpful.

 

[Landpimp]

I posted it on page 1 after I pulled the code

P1121 APPS range/performance problem, this was the only code in there, I ran the freeze frame and nothing odd was happening at the time, I forget what it showed

I thought your issue emanated from the TPS? Which code did your's display?

PO120: TPS
PO121: TPS

P1120: APPS
P1121: APPS

 

[spressomon]

I posted it on page 1 after I pulled the code

P1121 APPS range/performance problem, this was the only code in there, I ran the freeze frame and nothing odd was happening at the time, I forget what it showed

rusty_tlc's displayed both APPS codes: P1120 and P1121. I wonder, since your's only displayed P1120, if this is the reason you were able to "limp" and eventually was able to get the symptom to disappear (only a partial failure?)? Whereas rusty's rig was, for all intensive purposes, incapacitated.


Just trying to make some sense of all the apparent APPS variables

 

[NMuzj100]

The `98 TB assy was changed for the `99 model year with an "updated" part#.

Then for the`01 model year, the TB assy was again "updated" to its current part# ( FYI , this `01- update fits ALL `98 -`02 model 100`s)...
In May of `99 , the APPS (aka "throttle lever assy w/sensor") was updated as well. ( this also fits ALL 98-02 100`s )

So if you are concerned about maximum reliability (hopefully a result of redesigns) then the best option is to replace the entire "TB assembly" ?

Sin - What is the list on that ?

Second best is to replace just the APPS ?

In an earlier thread Christo indicated some failures he had seen were "coding" as TPS problems but were resolved with APPS replacement. This is consistent with the TPS design never changing but the APPS getting a redesign.

 

[rusty_tlc]

rusty_tlc's displayed both APPS codes: P1120 and P1121. I wonder, since your's only displayed P1120, if this is the reason you were able to "limp" and eventually was able to get the symptom to disappear (only a partial failure?)? Whereas rusty's rig was, for all intensive purposes, incapacitated.


Just trying to make some sense of all the apparent APPS variables

I read through both in your FSM last night (Thanks for the loan). IIRC the p1120 is the out put voltage out of spec, p1121 is the range error.
I my case the sensor was open so the O/P voltage was zero, which is also out of range?
Not sure why it pulled both codes.

 

[rusty_tlc]

OK... Here`s the skinny on the 98-2002 100 series TPS, APPS, and Throttle body
assy. ( well, at least as far as I can tell ;p )


It looks like the `98 model was the worst year overall

The `98 TB assy was changed for the `99 model year with an "updated" part#.

Then for the`01 model year, the TB assy was again "updated" to its current part# ( FYI , this `01- update fits ALL `98 -`02 model 100`s)

....

So... did this rhetoric of mine clear up anything guys ?

Oh happy day I have the "special" year.

So should I have ordered the '01 assy instead of the APPS/TPS?

That sounds expensive.

 

[Landpimp]

no, I got 1121.....which sound less serious than 1120 which sound like dead in the water to me, 1121.......it just aint right......but it aint dead

rusty_tlc's displayed both APPS codes: P1120 and P1121. I wonder, since your's only displayed P1120, if this is the reason you were able to "limp" and eventually was able to get the symptom to disappear (only a partial failure?)? Whereas rusty's rig was, for all intensive purposes, incapacitated.


Just trying to make some sense of all the apparent APPS variables

 

[spressomon]

I read through both in your FSM last night (Thanks for the loan). IIRC the p1120 is the out put voltage out of spec, p1121 is the range error.
I my case the sensor was open so the O/P voltage was zero, which is also out of range?
Not sure why it pulled both codes.

Ok...I think that explains why Landpimp was able to recover since he 'only' pulled the P1121 code.


The complete throttle body is somewhat north of a grand if I remember from an old post . Let's hope we don't need that part anytime!

 

[SINCITY100]

So if you are concerned about maximum reliability (hopefully a result of redesigns) then the best option is to replace the entire "TB assembly" ?

Good question... I would never tell someone to spend their hard earned $$ unless they truly needed to, but considering all the "issues" with the early model-year TB`s , It just might be the best solution for some of us so that we can drive a little more "worry-free".

Sin - What is the list on that ?

Well... its ummm... a very reasonable $1016.12


I guess if you actually add up the cost of all the other components in the TB ( APPS/TPS/TCM etc.. ) its really not that bad of a price

 

[rusty_tlc]

 

[spressomon]

Double








I think I just felt a heart murmur

 

[spressomon]

Oh happy day I have the "special" year.

So...look at it this way: You have a pristine rig that is devoid of any rust or corrosion that makes your rig very easy to work on .

 

[rusty_tlc]

So...look at it this way: You have a pristine rig that is devoid of any rust or corrosion that makes your rig very easy to work on .

I'd rather have a rig that didn't need to be worked on thank you very much.

 

[spressomon]

I'd rather have a rig that didn't need to be worked on thank you very much.

You're just around the corner and a couple days from having that rig

 

[hoser]

So a new throttle body, it comes with a new APPS and TPS, right? I'm seeing used '01-'02 throttle bodies for as low as $150. Maybe just throw that whole thing in the spares kit.

 

[SINCITY100]

So the new throttle body, it come with a new APPS and TPS, right? I'm seeing 01-02 throttle bodies for as low as $150. Maybe just throw that whole thing in the spares kit.

Thats a great idea !

If you could find a used later-model assy for $100-200 to use as a spare , you`d be set .

 

[hoser]

Would it be safe to say the 01-02 Tundra uses the same updated throttle body?

 

[SINCITY100]

Would it be safe to say the 01-02 Tundra uses the same updated throttle body?

100% affirmative... Its the same part#


You get extra brownie points for stating the obvious Hoser (even though it wasn`t obvious to me until you mentioned it )