Inspection Procedure

HINT:

• Read freeze frame data using a Techstream. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.
• The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Open Duty / Throttle Motor Close Duty) can be read using the Techstream. However the ECM shuts off the throttle actuator current when the ETCS malfunctions.

1. INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE ACTUATOR) 
   1. Disconnect the C17 throttle body connector.
   Fig 1: Identifying Throttle Body Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the resistance of the throttle actuator.

      Standard resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
      
      

      Tester Connections	Specified Conditions
      M+ (2) - M- (1)	0.3 to 100 Ω at 20°C (68°F)

   3. Reconnect the throttle body connector.

   NG: REPLACE THROTTLE BODY (See  REMOVAL   ) 

   OK: Go to Next Step 

2. CHECK HARNESS AND CONNECTOR (THROTTLE ACTUATOR - ECM) 
   Fig 2: Identifying Harness And Connector (Throttle Actuator - ECM)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the C17 throttle body connector.
   2. Disconnect the C20 ECM connector.
   3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
      
      

      Tester Connections	Specified Conditions
      M+ (C17-2) - M+ (C20-42)	Below 1 Ω
      M- (C17-1) - M- (C20-41)

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART
      
      

      Tester Connections	Specified Conditions
      M+ (C17-2) or M+ (C20-42) - Body ground	10 kΩ or higher
      M- (C17-1) or M- (C20-41) - Body ground

   4. Reconnect the throttle body connector.
   5. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

3. INSPECT THROTTLE BODY 
   1. Check for foreign objects between the throttle valve and the housing.

      OK: No foreign objects between throttle valve and housing. 

   NG: REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY 

   OK: Go to Next Step 

4. INSPECT THROTTLE VALVE 
   1. Check if the throttle valve opens and closes smoothly.

      OK: Throttle valve opens and closes smoothly. 

   NG: REPLACE THROTTLE BODY (See  REMOVAL   ) 

   OK: REPLACE ECM (See  REMOVAL   )