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?
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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
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.
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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