How to relearn throttle body on a Lexus is250

Pedal Relearn Procedure
Accerlerator Pedal Released Postion Learning is and operation to learn 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 LeHow to relearn throttle body on a Lexus is250 - icon1.pngg src="/uploads/images/icon1.png" alt="icon1.png" class="h_mi" /> 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.