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Old 03-31-2012, 04:48 PM   #1
schrags
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Join Date: Oct 2007
Chapter/Region: MWSOC
Location: Kentucky
Vehicle:
2006 STI SGM
2004 4Runner

Default Throttle Position Sensor CEL p2109

Car is a 2006 STI. Motor just back together, rebuilt shortblock. Intake manifold was left completely alone. Went to start it for first time and it starts, but idle surges around 1000rpm's and throws the CEL p2109: throttle / pedal position sensor A minimum stop performance . Pushing the throttle doesn't really do anything.

Troubleshooting:
-Took off intercooler, looked inside throttle body. It was clean and you can easily push and open the throttle, and it will close itself.
-Unplugged the position sensor connector, it looked good, plugged it back in.
-accessport logging. The voltage for the tps sensor stays at 0.85, but the duty always stays at 0 no matter if you push the throttle or not.

All the searching i've done didn't really help. A lot of people had the issue but noone really concluded what they did to fix it. Some did but it was random. Just doesn't make sense the sensor would all of a sudden go bad.
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Old 03-31-2012, 05:08 PM   #2
Uncle Scotty
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disconnect the battery for a few minutes.....reconnect the battery
DO NOT TOUCH THE THROTTLE PEDAL AT ALL ! ! ! !

.....reach in and turn the key all the way over to the LAST 'click' B E F O R R E the stater engages
DO NOT TOUCH THE THROTTLE PEDAL AT ALL ! ! ! !

count to 10 slowly
DO NOT TOUCH THE THROTTLE PEDAL AT ALL ! ! ! !

put the clutch pedal down and turn the key to start the car
DO NOT TOUCH THE THROTTLE PEDAL AT ALL ! ! ! !


let it start and let it run until the engine reaches full operating temp
DO NOT TOUCH THE THROTTLE PEDAL AT ALL ! ! ! !


turn the car off and take the key out
DO NOT TOUCH THE THROTTLE PEDAL AT ALL ! ! ! !


wait 30 seconds, put the key back in and start the engine
DO NOT TOUCH THE THROTTLE PEDAL AT ALL ! ! ! !


see what happens after that
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Old 03-31-2012, 05:44 PM   #3
schrags
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2004 4Runner

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I have done those steps except I did not let it get fully warm. After a little bit the AFR's lean to around 20 and I shut if off.

Some additional info:
I followed some first start technique suggested by axis performance posted on a forum. I left the harness connectors near the battery out, and kept cranking to prime the engine. I then re-connected them and reset the ECU, both by unplugging battery, hitting brake and waiting, and also via accessport.

The CEL still exists after reset right when you turn the key to accessory mode.

I have noticed that with the key in acc... the throttle doesn't make an electrical humming sound in which i remember it doing all the time.
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Old 04-05-2012, 09:18 PM   #4
schrags
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2004 4Runner

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Took it to turninconcepts to have them swap out the throttle body and see if that was it. Turns out it was some loose wires in the connector, which glancing at looked fine. Upon my searching I saw a lot of people run into this issue when they did a lot of major work to the car. I believe this happened when I tried tucking the blow of valve to intake line behind the throttle body to install crankcase vent line. Some people solved it by replacing the throttle body but make sure it's not the connector first and that a new throttle body wasn't actually the fix, messing with the connector was.
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Old 01-18-2013, 08:08 PM   #5
MonsterSubie
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I have an 06 Wrx and I encountered the same problem. I used the relearn procedure as mentioned by Uncle Scotty and it seems to be working so far. The next couple of days will tell all. +1 internets for Uncle Scotty.
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Old 01-19-2013, 11:55 AM   #6
WashWRX
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From what the OP states, the TPS has a stuck in-range failure. As you described the voltage does not change and is stuck at 0.85 V, and as you saw the duty cycle for the sensor is stuck at zero. In my experience the sensor will have to be replaced and I don't see the reset procedure as the long term solution...at least that's what I have seen in my past experiences. Good luck
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Old 01-13-2014, 09:35 AM   #7
jwijnaldum
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Default TPS senser/ Throttle

Hi guys,
i'm somewhat having a similar issue, i replaced my MAF senor lately and i noticed that in the moring when crank up the engine, its idles link it wants to die but it catches itself to idle normal also when i try accelerate quickly, the car wants to die but doesn't.

what i wanted to know if i have a bad spot in my TPS or do i have to replace the sensor also.

for the record im driving a JDM 2000 subaru forester sti. turbo.

Your help would be greatly appreciated

regards,
jwijnaldum
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