On-Vehicle Inspection

INSPECT THROTTLE BODY ASSEMBLY
1. Listen to the throttle control motor operating sounds.
  1. Turn the ignition switch to ON.
  2. When pressing the accelerator pedal, listen to the running sounds of the motor. Make sure no friction noises come from the motor.
    If friction noises exist, check the throttle body, wire harness and ECM.
2. Inspect the throttle position sensor.
  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the intelligent tester ON.
  4. Select the menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / THROTTLE POS.
  5. Depress the accelerator pedal. When the throttle valve is fully opened, check that the THROTTLE POS value is within the specified values.
    
    Fig 1: Connecting Intelligent Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard:
    
    60 % or more
    
    NOTE: When checking the standard throttle valve opening percentage, the transmission should be in the neutral position.
    
    If the result is not as specified, check the throttle body, wire harness and ECM.