Inspection Procedure

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. INSPECT THROTTLE BODY ASSY (RESISTANCE OF THROTTLE CONTROL MOTOR) 
   1. Disconnect the T2 throttle body connector.
   2. Measure the motor resistance between the terminals of the throttle control motor.

      Standard: 

      Fig 1: Throttle Body Assy Terminals Specified Condition Chart

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Reconnect the throttle body connector.
      Fig 2: Identifying Throttle Body Assy Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE THROTTLE BODY ASSY 

   OK: GO TO NEXT STEP. 

2. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM) 
   1. Disconnect the T2 throttle body connector.
   2. Disconnect the E8 ECM connector.
   3. Check the resistance between the wire harness side connectors.

      Standard (Check for open): 

      Fig 3: Throttle Control Motor And ECM Terminals Specified Condition Chart (Check For Open)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      Fig 4: Throttle Control Motor And ECM Terminals Specified Condition Chart (Check For Short)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the throttle body connector.
   5. Reconnect the ECM connector.
      Fig 5: Identifying Throttle Body Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 6: Disconnecting E8 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: GO TO NEXT STEP. 

3. INSPECT THROTTLE BODY ASSY 

   Check if a foreign object has been caught between the throttle valve and housing. Also, check if the valve can open and close smoothly.

   NG: REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY 

   OK: GO TO NEXT STEP. 

   REPLACE ECM (See  ECM (3MZ-FE)  )