High idle?

Tiny
TONYCOROLLA
  • MEMBER
  • 2009 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 206,000 MILES
When the car is started the idle is around 1800 to 2200 RPM. After warming up idle the same in park. I did have a P0420 code when checked with OBD2. I changed the 2 Catalytic converters and both O2 sensors and code went away but the fast idle didn't change. Also put in a new temperature sensor, PVC valve, throttle body, air filter and checked for air leaks in hoses. The only thing I haven't done is change the gas pedal. I think they call it the throttle position sensor since there is no cable to the carburetor. I'm also not sure if there is an Idle air control valve on this car. I tried the idle relearn procedure after warming up, which didn't help.
Tuesday, September 5th, 2023 AT 3:23 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

It sounds like you have already done a lot. As far as an idle air control valve is concerned, this vehicle doesn't have one. In its place is the throttle position actuator which is an integral component in the throttle body.

We need to do a few checks. If you look below, I attached the general diagnostics related to the throttle position sensor. Take a look through them and let me know if they help. Note: that you are checking the TPS, but in addition, the accelerator pedal position sensor must correlate as far as output. The outputs are included in the diagnostics.

Let me know what you find.

Take care,

joe

See pics below.
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Tuesday, September 5th, 2023 AT 8:04 PM
Tiny
TONYCOROLLA
  • MEMBER
  • 3 POSTS
I do not have an OBD2 scanner. I took the car to a local auto parts dealer, and they scanned it for free. They told me no codes came up on scanner. The last time they did it P0420 code came up and I put in Catalytic converters and both O2 sensors and that made the check engine light go out.
Other than the high idle (2,000 RPMs) the car drives fine?
I may have to take the car into a shop and have them scan it. I think the scan tools they use at auto part dealers may not be as good.
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Wednesday, September 6th, 2023 AT 1:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

Thanks for the update. Certainly, the scan tools used by reputable shops will be much better. The ones at parts stores are usually basic scanners that can only read powertrain codes.

Are you able to perform the diagnostics I attached above?

Let me know.

Joe
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Wednesday, September 6th, 2023 AT 5:30 PM
Tiny
TONYCOROLLA
  • MEMBER
  • 3 POSTS
Not without a good scanner. Is there a way to check the TPS (accelerator pedal) with a multimeter tester? It seems like the check engine light should be on. I did notice the more I drive the car the higher the idle goes? Thanks, Tony
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Thursday, September 7th, 2023 AT 6:39 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

A scanner needs to be used because you are confirming signals at the APP and the TPS are equal and where they should be. If you jump back and forth, there is too much room for error.

I wish I had a better answer for you.

Take care,

Joe
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Thursday, September 7th, 2023 AT 1:32 PM

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