Inspection Procedure

HINT:

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

1. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (RESISTANCE OF THROTTLE CONTROL MOTOR) 
   1. Disconnect the B14 throttle with motor body connector.
      Fig 1: Identifying B14 Throttle With Motor Body Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the resistance between the terminals of the throttle control motor.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATIONS
      
      

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

   3. Reconnect the throttle with motor body connector.

   NG: REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY  (See REMOVAL  )

   OK: Go TO NEXT STEP 

2. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM) 
   1. Disconnect the B14 throttle with motor body connector.
   2. Disconnect the B1 ECM connector.
      Fig 2: Identifying B14 Throttle With Motor Body Connector & B1 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Check the resistance.

      Standard Resistance (Check for open) 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      M+ (B14-2) - M+ (B1-5)	Below 1 Ω
      M- (B14-1) - M- (B1-4)

      Standard Resistance (Check for short) 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      M+ (B14-2) or M+ (B1-5) - Body ground	10 kΩ or higher
      M- (B14-1) or M- (B1-4) - Body ground

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

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go TO NEXT STEP 

3. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY 
   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 WITH MOTOR BODY ASSEMBLY  (See REMOVAL  )

   OK: REPLACE ECM  (See REMOVAL  )