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Old 10-28-2009, 01:47 PM   #1 (permalink)
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tps adjustment?

Whats the IS300 stock TPS adjustment at?? what voltage should it say? between .65 -.7 voltage? someone was playing with it and left the 2 screw loose and it was moving itself around... the voltage is out of whack... whats the proper voltage for me to set it at?

thanks.
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Old 05-25-2011, 06:17 PM   #2 (permalink)
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i need this as well. and which wires to check between. they have a red, green, blue, and peach looking color.
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Old 05-25-2011, 08:13 PM   #3 (permalink)
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Here's what I have, pretty much stock engine

Between VTA and E2(ground) 0.65vdc@ignition on/car not running
Between VTA2 and E2(ground) 2.39vdc@ignition on/car not running

Other info
Between VTA and VTA2 1.75vdc@idle
Between VC and VTA2 1.75vdc@idle
Between VC and VTA 4.33vdc@idle



Mine has never been moved.

Wire identification-
Brown-E2(ground)
Blue w/yellow stripe-VC
white w/red stripe-VTA
Green w/yellow stripe-VTA2

@68*F accross terminals VC and VTA2, you should have a resistance of 1.2K-3.2K ohms
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Last edited by jasonm4; 01-06-2014 at 03:56 AM. Reason: correction
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Old 05-29-2011, 10:09 PM   #4 (permalink)
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i think youare supposed to check it with the car set to on but the car not running? not sure though. id like a definitive answer as to which wires to check at which time. its supposed to be between .65 and .74 from what most posts say. thanks for the info jason
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Old 05-30-2011, 02:10 AM   #5 (permalink)
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that's what I thought Sanctfy, but I wasn't sure because it's been awhile. I also thought it was between VTA and VTA2. If someone wants to verify, I'd be willing to check.
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Old 05-30-2011, 03:30 AM   #6 (permalink)
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Could use this info also.
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Old 05-30-2011, 08:29 AM   #7 (permalink)
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look in Lexus service manual.. download it and go to pg. 250 and 254.. it'll help

Do not check TPS when running.. do it with key on "ON position". and not running.
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Old 05-30-2011, 01:34 PM   #8 (permalink)
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For future reference, anybody that doesn't have the FSM and needs to re-center the TPS, the voltage should be between .60 and .75 vdc. I talked with Lexus300IST, and he was able to confirm which wires need to be checked with a voltmeter. Looking at the TPS, it is the second from the top terminal and bottom terminal, which are the wires you want to take a reading from. These wires are:
white w/red stripe(VTA)
Brown(E2/or good ground)


So, you are basically checking the voltage to ground on the VTA wire. My car read .675 and obviously when I moved the throttle reel, the throttle motor will move the TPS and the voltage will raise. This is not described in any of the FSM's or schematics I have. The FSM requires an OBDII to check current data of the throttle position while adjusting the sensor CCW.
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Old 11-13-2011, 04:27 PM   #9 (permalink)
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Quote:
Originally Posted by crxguy View Post
I think I am having a similar issue. I am stuck. I have no throttle until last 10 percent of pedal.

I took off the throttle acceleration motor but did not move the TPS. In fact tested it at VAT wire and red a .7VDC so this should be good. RESET ECU by pulling negative batt cable for about 5 min and held brake on.

Any other suggestions. BTW... The throttle acceleration motor spins free. I am not sure if that is the proper way for it to work when not under power?
Yea, the TPS should never have to be moved typically and sounds like your TCM isn't working. Usually if the throttle control motor has failed, you would be in "limp" mode as well as a DTC. When you turn the throttle for the first 50%, does the TCM move the butterfly or hum in an attempt to activate?

The TCM should be free spinning because it contains a clutch and shaded pole motor. When you disconnect the TCM connector and look straight at the pins, the two on the left are the motor terminals(white and red wires). You should also be able to hear the TCM buzz or hum when the throttle is pushed.

M+/M-(between these two you should have 0.3-100 ohms at 68*F)

C+/C-(between these two you should have 4.2-5.2 ohms at 68*F)
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Last edited by jasonm4; 11-13-2011 at 05:05 PM.
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Old 01-05-2014, 11:04 PM   #10 (permalink)
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I only get .56 on my voltimeter can't gat to read .60 to .71 don't know what I'm doing wrong
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Old 01-06-2014, 03:54 AM   #11 (permalink)
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Quote:
Originally Posted by Viktour View Post
I only get .56 on my voltimeter can't gat to read .60 to .71 don't know what I'm doing wrong

Do you still have the TPS mounted and just turning it clockwise or counterclockwise? Not sure why you can't achieve 0.65v. What about VTA2, can you get that set at 2.39v? Make sure you have a good ground or are using the brown E2 ground wire and are checking this with just the ignition on and car off.
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Old 01-06-2014, 09:55 PM   #12 (permalink)
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I just make it to get .65v but my rpm are to high it goes up to 2000 that's normal or what can I do now
Thanks
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Old 01-07-2014, 06:58 AM   #13 (permalink)
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Quote:
Originally Posted by Viktour View Post
I just make it to get .65v but my rpm are to high it goes up to 2000 that's normal or what can I do now
Thanks
Is your engine already warmed up and it still idles that high? Because if the car is cold it will idle around 2k or more until the car heats up. Idle should be around 700rpms, so I wanted to make sure the engine was hot when it idles that high and rule that out.
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