On-Vehicle Inspection

1. Inspect the throttle control motor for operating sound.
   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.

      Fig 1: Inspecting Throttle Control Motor For Operating Sound

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the accelerator pedal position sensor.
   1. Connect the TOYOTA hand-held tester or OBD II scan tool to the DLC3.
      Fig 2: Connecting Hand-Held Tester Or OBD II Scan Tool To DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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 CURRENT DATA shows the standard value.

      Standard throttle valve opening percentage: 60% or more 

      If operation is not as specified, check that the accelerator pedal position sensor (See DTC P2120, P2122, P2123, P2125, P2127, P2128, P2138: THROTTLE/PEDAL POSITION SENSOR/SWITCH "D & E" CIRCUIT LOW INPUT/HIGH INPUT & THROTTLE/PEDAL POSITION SENSOR/SWITCH "D & E" VOLTAGE CORRELATION ), wiring and ECM.

      If you have no TOYOTA 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 Terminal VPA & E2

   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.

      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.

1. Disconnect the throttle connector.
2. Using an ohmmeter, measure the motor resistance between terminal M+ and M-.

   Motor resistance: 0.3 - 100 Ω at 20°C (68°F) 

   If the resistance is not as specified, replace the throttle body.

   Fig 4: Measuring Motor Resistance Between Terminal Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reconnect the throttle body connector.

If necessary, replace the throttle body.

Be careful not to disassemble the throttle body.