On-Vehicle Inspection

REMOVE V-BANK COVER
INSPECT SYSTEM OPERATION
1. Inspect the throttle control motor for operating sound.
  
  Fig 1: Identifying Throttle Control Motor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Turn the ignition switch ON.
  2. When turning the accelerator pedal position sensor lever, check the running sound of the motor. Also, check that there is no friction sound.
  If operation is not as specified, check the throttle control motor (See step 3), wiring and ECM.
2. Inspect the accelerator pedal position sensor.
  1. Connect the LEXUS hand-held tester or OBD II scan tool to the DLC3.
  2. Check that the MIL does not come on.
  3. When turning the accelerator pedal position sensor lever to the full-open position, check that the throttle valve opening percentage (THROTTLE POS) of the CURRENT DATA shows the standard value.
    1. Standard throttle valve opening percentage: 60% or more
  If operation is not as specified, check that the accelerator pedal position sensor (See DTC P2120 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT, DTC: P2122 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT LOW INPUT, DTC: P2123 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT HIGH INPUT, DTC: P2125 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT, DTC: P2127 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT LOW INPUT, DTC: P2128 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT HIGH INPUT, DTC: P2138 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D"/"E" VOLTAGE CORRELATION ), wiring and ECM.
  
  If you have no LEXUS hand-held tester or OBD II scan tool, measure the voltage between terminal VPA and E2 of the ECM connector.
  
  Fig 3: Measuring Voltage Between Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect the air assist system.
  1. Start the engine and check that the MIL does not come on.
  2. Allow the engine to warm up to normal operating temperature.
  3. Turn the A/C compressor ON to OFF, and check the idle speed.
    1. Idle speed (Transmission in neutral): 700 +/- 50 rpm
    NOTE: Perform inspection under the condition with no electrical load.
4. After checking the above ( b) to ( d), perform the running test and check that there is no incongruity.
INSPECT THROTTLE CONTROL MOTOR
1. Disconnect the throttle connector.
2. Using an ohmmeter, measure the motor resistance between terminal (M+) and (M-).
  1. Motor resistance: 0.3 - 100 Ω at 20°C (68°F)
  Fig 4: Measuring Motor Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the resistance is not as specified, replace the throttle body.
3. Reconnect the throttle body connector.
INSPECT THROTTLE POSITION SENSOR (See DTC P0120, P0122, P0123, P0220, P0222, P0223, P2135: THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT LOW INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT HIGH INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT LOW INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT HIGH INPUT, THROTTLE/PEDAL POSITION SENSOR/SWITCH "A"/"B" VOLTAGE CORRECTION )
If necessary, replace the throttle body.

NOTE: Be careful not to give a shock to the throttle body.
Be careful not to disassemble the throttle body.
REINSTALL V-BANK COVER