Inspection Procedure

HINT:

• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
• The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Open Duty, Throttle Motor Closed Duty) can be read using the Techstream. However, the ECM shuts off the throttle actuator current when the ETCS malfunctions.

1. INSPECT THROTTLE BODY ASSEMBLY (THROTTLE ACTUATOR RESISTANCE) 
   1. Disconnect the T6 throttle body assembly connector.
   Fig 1: Identifying T6 Throttle Body Assembly Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the resistance between the terminals of the throttle body.

      Standard resistance 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

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

   3. Reconnect the throttle body connector.

   NG: REPLACE THROTTLE BODY ASSEMBLY 

   OK: Go to next step 

2. CHECK HARNESS AND CONNECTOR (THROTTLE ACTUATOR - ECM) 
   1. Disconnect the T6 throttle body connector.
   Fig 2: Identifying T6 Throttle Body Connector And E4 ECM Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Disconnect the E4 ECM connector.
   3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      M+ (T6-2) - M+ (E4-4)	Below 1 Ω
      M- (T6-1) - M- (E4-3)	Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      M+ (T6-2) or M+ (E4-4) - Body ground	10 kΩ or higher
      M- (T6-1) or M- (E4-3) - Body ground	10 kΩ or higher

   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.

   NG: CLEAN THROTTLE BODY 

   OK: Go to next step 

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

   NG: REPLACE THROTTLE BODY ASSEMBLY 

   OK: REPLACE ECM