Question about 1992 Lexus Ls 400

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Ls400 1991, I replaced the throttle postioning sensor and it still idles and won't go when I accelerate.

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  • rs_danny Jun 04, 2009

    when idled the cars RPMS reve from 0 to 1 all on its own.
    when I am driving,tryinf to accelerate the car will not go(no power) car is on but not going any where.no action.the engine still reves every so often.But will n ot go when I accelerate.

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  • Lexus Master
  • 3,433 Answers

The MAF sesortells the puter how much fuel is needed for proper air fuel ratio. It is located in the duct coming from the air filter. the first sensor. Good luck.

Posted on Jun 03, 2009

  • Ned C Cook
    Ned C Cook Jun 03, 2009

    Hello; When you say it won't go when you accelerate, Are you saying there is no power or the transmission feels to be not in gear? It sounded as if you had no power when you tried to pick up speed. Misinterptreted on my part? If so my apologies. Now, is it the transmission issue or engine performance issue?

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How to relearn throttle body on a Lexus is250


Pedal Relearn Procedure
Accerlerator Pedal Released Postion Learning is and operation to learnicon1.png the full released postions of the accerlerator pedal by monitoring the accelerator pedal sensor output signal. It must be performed each time harness connector of accelearator pedal postion sensor or ECM is disconnected.

1. Make Sure the acceleartor Pedal is fully released
2. Turn Ignition switchON and wait at least 2 Seconds.
3. Turn ignition switchOFF and wait at least 10 Seconds
4. Turn Ignition switchON and wait at least 2 seconds.
5. Turn Ignition switchoff and wait at least 10 seconds

Throttle Valve Relearn
Throttle ValveClosed Postion Learningicon1.png is to learn the fully closed postion of the throttle valveby monitoring the throttle position sensor output signal. It must be performed each time harness of
electric throttle control actuator or ECM is disconnect.

1.Make sure accelerator pedal is fully released.
2. Turn ignition ON
3. Turn igntion switch OFF and wait at least 10 seconds. Make sure that the throttle valvemoves during the 10 seconds by confrming the operating sound.
(You can hear the TB sound when you have key on and shifter in first gear and step on the gas. So you know what you listening for.)


Idle Air Volume Relearn Procedure
The Following Condtions Must be met in order for procedure to Work.

Battery Voltage :More than 12.9 volts at idle
Engine Coolant Temp 158-203 degrees Farenhiet
Electric Load Switch OFF i.e Air Condition, headlamps , rear defogger
Steering Wheel: Neutral Postion (Straight Ahead)
PNP Switch: OFF (Park Neutral Switch i.e. Clutch Switch...pretty sure)


1. Perform ACCERLEARATOR PEDAL RELEASED POSTIONS LEARNING
2. Perform THROTTLE VALVECLOSED POSITION LEARNING
3. Start engine and warm it up to operation temperature
4. Turn igniton switch OFF and wait at least 10 seconds
5. Confirm Gas Pedalif fully realeased, then turn igniton switch ON and wait 3 seconds
6. Fully step on and release gas pedal5 time within 5 seconds
8. Wait 7 seconds and fully step on gas and stay on until MIL stops blinking and is steady.
9. Fully release the Gas pedalwithin 3 seconds after the MIL has turned ON steady.
10. Start engine imediatly and let idle. Wait 20 seconds.

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easy ..........throttle postioning sensor ,or your throttle is sticking meaning your throttle cable isnt moving in an out properly

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http://www.fixya.com/ThreadView.aspx?thid=2533916&prdid=698832

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