Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. 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.

1. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (RESISTANCE OF THROTTLE CONTROL MOTOR) 
   1. Disconnect the T2 throttle body assembly connector.
      Fig 1: Identifying T2 Throttle Body Assembly Connector Terminal (1 Of 2)

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   2. Measure the resistance of the throttle actuator.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      M+ (T2-2) - M- (T2-1)	0.3 to 100 Ω at 20°C (68°F)

   NG: REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY 

   OK: Go to next step 

2. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM) 
   1. Disconnect the T2 throttle body assembly connector.
      Fig 2: Identifying T2 Throttle Body Assembly Connector Terminal (2 Of 2)

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   2. Disconnect the E5 ECM connector.
   3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      M+ (T2-2) - M+ (E5-5)	Below 1 Ω
      M- (T2-1) - M- (E5-4)

      Standard resistance (Check for short) 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      M+ (T2-2) or M+ (E5-5) - Body ground	10 kΩ or higher
      M- (T2-1) or M- (E5-A) - Body ground

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

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

3. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE) 
   1. Check between the throttle valve and the housing for foreign objects. Also check if the valve can open and close smoothly.

      OK: 

      The throttle valve is not contaminated by foreign objects and can move smoothly. 

   NG: REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY 

   OK: REPLACE ECM