Inspection Procedure

HINT:

• Read freeze frame data using the intelligent tester. 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.
• The throttle actuator current (THROTTLE MOT) and the throttle actuator duty ratio (THROTTLE OPN / THROTTLE CLS) can be read using the intelligent tester. However, the ECM shuts off the throttle actuator current when the ETCS malfunctions.

1. INSPECT THROTTLE BODY (THROTTLE ACTUATOR RESISTANCE) 
   1. Disconnect the T26 actuator connector.
      Fig 1: Identifying T26 Actuator Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the resistance between terminals 1 and 2 of the throttle body.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

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

   NG: REPLACE THROTTLE BODY 

   OK: Go to next step 

2. CHECK WIRE HARNESS (THROTTLE ACTUATOR - ECM) 
   1. Disconnect the T26 actuator connector.
   2. Disconnect the E2 ECM connector.
      Fig 2: Disconnecting E2 ECM Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      T26-1 (M-) - E2-1 (M-)	Below 1 Ω
      T26-2 (M+) - E2-2 (M+)	Below 1 Ω
      T26-1 (M-) or E2-1 (M-) - Body ground	10 kΩ or higher
      T26-2 (M+) or E2-2 (M+) - Body ground	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: Go to next step 

3. INSPECT THROTTLE BODY 
   1. Check the throttle body for foreign objects.

      OK: 

      No foreign objects between the throttle valve and the housing. 

   NG: REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY 

   OK: Go to next step 

4. INSPECT THROTTLE VALVE 
   1. Check if the throttle valve can open and close smoothly.

      OK: 

      Throttle valve can move smoothly. 

   NG: REPLACE THROTTLE BODY 

   OK: REPLACE ECM