P1121 code, tried a few things but nothing! Help!
09-28-12, 04:24 PM
#32
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The accelerator position sensor is this one, closest to the firewall:
As for the box they speak of on the PDF, that's the ECM (ECU) located on the passenger side underneath the carpet (atleast on the SC300 it's there). You should check all the voltages on the sensor PINs before checking the ECM though (VPA, VPA2). Thats the way the manual says the troubleshoot.
As for the box they speak of on the PDF, that's the ECM (ECU) located on the passenger side underneath the carpet (atleast on the SC300 it's there). You should check all the voltages on the sensor PINs before checking the ECM though (VPA, VPA2). Thats the way the manual says the troubleshoot.
THANKS
09-28-12, 04:55 PM
#33
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nevermind found the entire throttle body.
1 last question, how are you guys able to remove the accelerator position sensor. I can get to 2 screws easily and can see a 3rd but the 4th is hidden. Is the only way to remove the entire throttle body?
1 last question, how are you guys able to remove the accelerator position sensor. I can get to 2 screws easily and can see a 3rd but the 4th is hidden. Is the only way to remove the entire throttle body?
09-30-12, 11:11 AM
#35
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See the PDF titled "REPL.pdf" that Quicksc4 posted; that PDF shows exactly how to replace the APPS, TCM and the TPS (If that needs to be replaced but is rarely the issue) along with pictures of how each look. There are 4 screws and total on the APPS, these need to be removed, take note of the metal stopper thingy that'll need to be moved out of the way to remove the 2 lower screws. There is no need to remove the entire throttle body as I replaced the APPS without doing so.
10-01-12, 04:42 PM
#36
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MD thanks! I appreciate it. I'll try and do it without removing the whole throttle body. How's the car running? I noticed the CE light and trac off flashing after driving on the highway and running into traffic. Now when I clear it it comes on from normal stop and go traffic too. Every time I pull the code it's P1121 guaranteed. I really hope this solves the issue. This car has been a tank for me. 12 years, 230,000 miles and all I've replaced are 2 O2 sensors and the ball joints. Wife wants to buy a new car for me but I can't let go! Wanna break 300k and hopefully 400k. 
10-01-12, 06:50 PM
#37
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MD thanks! I appreciate it. I'll try and do it without removing the whole throttle body. How's the car running? I noticed the CE light and trac off flashing after driving on the highway and running into traffic. Now when I clear it it comes on from normal stop and go traffic too. Every time I pull the code it's P1121 guaranteed. I really hope this solves the issue. This car has been a tank for me. 12 years, 230,000 miles and all I've replaced are 2 O2 sensors and the ball joints. Wife wants to buy a new car for me but I can't let go! Wanna break 300k and hopefully 400k.
By the way, I have a TCM from the throttle body if anyone wants to buy it. And of course the throttle body itself.
10-02-12, 05:17 AM
#38
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Car is running good, no CE light at all after 3.5 weeks of driving it. I did alot of intensive research on this because I didn't want to shell out $200+ on the APPS and find it was the TCM or vice-versa. Every where I seemed to read pointed at the APPS so it is very likely that the APPS is culprit. Although, if you were like me and bought a whole throttle body with the APPS and TCM for $100 you save yourself from gambling with these high priced parts.
By the way, I have a TCM from the throttle body if anyone wants to buy it. And of course the throttle body itself.
By the way, I have a TCM from the throttle body if anyone wants to buy it. And of course the throttle body itself.
10-04-12, 07:26 PM
#39
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Replaced the apps today and was able todo it without removing the throttle body. Thanks MD. Drove around for a bit and all seems well. Will report back after a few days. Usually the CE and limp mode happens pretty quick so I'll have an idea if it worked real soon
10-16-12, 11:10 AM
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just an update, about 400miles logged and no issues with the check engine light or trac flashing. Car is running great. thanks again guys, threads like these really help keep our cars alive!!!
01-16-13, 08:59 AM
#44
I am having this issue now. Pretty freaky really. Sometimes i have my kids in the car. 108K miles on mine. Happened when I put it into reverse. P1121 code and VSC light. Cleared on its own but code was stored.
Trying to figure out the best place to buy the APPS at this point. All the TB assy's I have found are more expensive anyway.
Going price seems to be around $250. Ouch!
Trying to figure out the best place to buy the APPS at this point. All the TB assy's I have found are more expensive anyway.
Going price seems to be around $250. Ouch!
03-07-17, 04:20 AM
#45
I bought a brand new APP sensor and installed over the weekend. Still I am getting the engine light on and TRAC light blinking. The accelerator pedal still stuck to the floor. should I change the Throttle Position Sensor?