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Old 03-07-2016, 11:00 AM #1
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High Idle After Cleaning Throttle Body 2001-2002

So my 2002 has a different throttle body because its "drive by wire".

here is a description of how the throttle body works on my 2002. there is a cable that comes from the gas pedal, it attaches to the throttle body on the front, on the back there is a compartment that holds a motor and gear set, and attached to that gear set is the tps or throttle position sensor. there is no IAC, in fact the coolant just passes right through for some reason and is not connected to anything. the cable coming from the gas pedal can actuate the butterfly after overcoming a lot of slack, this is in case the tps fails or something.

so heres my problem, after cleaning all the grime out of the throttle body the idle is about 1200 rpm instead of the normal 600-700 rpm. I thoroughly cleaned the entire thing and there is no residue left over or liquid left. the tps sensor is adjustable but I left it in the position it was in when i removed the throttle body. there was a significant amount of grime so I cleaned it all, i also reset the efi. the feeling i get is that the tps needs to be adjusted because it feels like the idle is stronger while in drive.

update: I adjusted the angle of the tps sensor, and was able to correct my idle speed. to me this indicates that idle is not always dictated by the ecu, there is a screw that basically sets the idle speed just like a mechanical throttle body. anyways if you have the drive by wire throttle body and have this problem, simply adjust the tps sensor angle, I loosened both screws and then rotated it until the idle was where I wanted while it was running. this should help someone as I havent found any other info on the subject.
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Last edited by D Farms; 03-07-2016 at 11:19 AM.
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Old 03-20-2016, 12:53 PM #2
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so here is my issue ive cleaned it and same thing however the butterfly isnt opening fully when i pull the cable. Itried adjusting the spring but that did nothing any ideas?
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Old 03-20-2016, 01:25 PM #3
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Clean the IAC.

Edit: just read 2002. I can't read. Sorry.
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Last edited by nc-grayson; 03-20-2016 at 01:30 PM. Reason: False info
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Old 02-25-2020, 01:52 PM #4
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Quote:
Originally Posted by D Farms View Post
So my 2002 has a different throttle body because its "drive by wire".

here is a description of how the throttle body works on my 2002. there is a cable that comes from the gas pedal, it attaches to the throttle body on the front, on the back there is a compartment that holds a motor and gear set, and attached to that gear set is the tps or throttle position sensor. there is no IAC, in fact the coolant just passes right through for some reason and is not connected to anything. the cable coming from the gas pedal can actuate the butterfly after overcoming a lot of slack, this is in case the tps fails or something.

so heres my problem, after cleaning all the grime out of the throttle body the idle is about 1200 rpm instead of the normal 600-700 rpm. I thoroughly cleaned the entire thing and there is no residue left over or liquid left. the tps sensor is adjustable but I left it in the position it was in when i removed the throttle body. there was a significant amount of grime so I cleaned it all, i also reset the efi. the feeling i get is that the tps needs to be adjusted because it feels like the idle is stronger while in drive.

update: I adjusted the angle of the tps sensor, and was able to correct my idle speed. to me this indicates that idle is not always dictated by the ecu, there is a screw that basically sets the idle speed just like a mechanical throttle body. anyways if you have the drive by wire throttle body and have this problem, simply adjust the tps sensor angle, I loosened both screws and then rotated it until the idle was where I wanted while it was running. this should help someone as I havent found any other info on the subject.
I didn't realize this and had my mechanic remove the Throttle Body on my 02 and clean it. I don't think he realized this either until he took it off.

Bottom line he cleaned it somehow. Now my cold start idle ( after sitting all night) is 1900 rpm. After awhile it comes down to 900 rpm. I have tapped on the throttle body during high idle with no change.

In my mind I shouldn't have to adjust the tps sensor angle since it does eventually come down.

What do you suggest. Remove and clean again?
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Old 02-26-2020, 05:24 PM #5
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Bump.

What have other 2001-2002 4Runners or 2003-2004 Taco owners done in this situation to remedy?

I have also searched Tacoma World to no avail.
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Old 02-27-2020, 11:54 AM #6
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You have fly-by-wire throttle control.
You do not need to do anything, just continue to drive and it will relearn on its own. My friend's 06 Corolla in Australia had the same issue and he said after 2-3 days of driving, the RPM returned to normal.
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Old 02-27-2020, 01:36 PM #7
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Quote:
Originally Posted by anniesball72 View Post
Bump.

What have other 2001-2002 4Runners or 2003-2004 Taco owners done in this situation to remedy?
I simply bent the 'L' bracket holding the cable end while the engine was fully warmed/idling until it was where I wanted. Starts cold and idles around 1300 and drops steadily to 700 as it warms up.

Crude as heck yet it works on mine....
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Old 02-29-2020, 08:33 PM #8
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Quote:
Originally Posted by nissanh View Post
You have fly-by-wire throttle control.
You do not need to do anything, just continue to drive and it will relearn on its own. My friend's 06 Corolla in Australia had the same issue and he said after 2-3 days of driving, the RPM returned to normal.
EXACTLY THIS.

Idle will be erradic for up to a WEEK. Then it will settle in and be solid. This was after I replaced my entire TB with a new unit.

Do not bend/twist/adjust anything.

-Mike
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Old 03-01-2020, 05:50 PM #9
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Quote:
Originally Posted by negusm View Post
EXACTLY THIS.

Idle will be erradic for up to a WEEK. Then it will settle in and be solid. This was after I replaced my entire TB with a new unit.

Do not bend/twist/adjust anything.

-Mike
I couldn't agree more. It has been almost 2 weeks and it seems to be settling down.

Can someone explain why this happens? If there is no IAC to clean what has changed in the ECM's "eyes"?

So all I can figure that my mechanic cleaned was the bore of the throttle body and what's behind the metal plate on top. Right?
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Old 03-03-2020, 01:04 PM #10
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Quote:
Originally Posted by negusm View Post
EXACTLY THIS.

Idle will be erradic for up to a WEEK. Then it will settle in and be solid. This was after I replaced my entire TB with a new unit.

Do not bend/twist/adjust anything.

-Mike
Update was still having the same high idle problem so I reset the computer again. Left the battery cable off a few hours yesterday.
Re-connected it. Started up cold fine and idled fine.

This morning. Started it up and it did not high idle. I idled about 1300 for a few minutes then settled down. I thought I was through the tunnel!

Drove it around town a little 2-3 miles, barely warmed up. Stopped at the grocery store stopped and restarted the truck. Now it started idling very low. Like 4-500rpm.

Reved it a little no help. Restarted truck no help.

Drove on the highway about 5 miles, got off off ramp and the pedal went dead, no throttle. Check engine light came on. Engine would only rev if I used the failsafe cable.

Restarted truck at off ramp throttle came back. would run.

Next intersection same thing had to restart it.

I scanned the ECM and it had a P2111 code. Throttle stuck open.

I cleared the code. Restarted and it seemed fine including idle.

The above sequence is exactly what happened right after I had the throttle body cleaned. Does that mean it's on it's way out?
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Old 03-09-2020, 02:14 PM #11
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Well, I don't know but it could be a few things with the TB.

Are you sure P2111 is "Throttle stuck open". The description I get from google is "throttle actuator control system stuck open". The difference is subtle.

P2111 Throttle Actuator Control System Stuck Open

I would imagine that code is probably either:

TPS
Pedal Position Sensor.
Internal motor.

They are supposed to work in conjunction with each other.

Since now you can get the TPS from Partsgeek...for $40. I'd probably try that route first before plunking down for a full TB.

If that doesn't work, I'd also take the TB off, clean it really well inside and out again...and lube it. If it's busted...can't get any worse from another cleaning.

-Mike
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