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.
• 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 WITH MOTOR BODY ASSEMBLY (RESISTANCE OF THROTTLE CONTROL MOTOR) 
   1. Disconnect the T2 throttle with motor body connector.
   2. Measure the resistance between the terminals of the throttle control motor.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

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

   3. Reconnect the throttle with motor body connector.

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

   Fig 1: Identifying Throttle With Motor Body Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next Step 

2. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM) 
   1. Disconnect the T2 throttle with motor body connector.
   2. Disconnect the E8 ECM connector.
   3. Measure the resistance.

      Standard resistance: 

      Check for open 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      M+ (T2-2) - M+ (E8-5)	Below 1 Ω
      M - (T2-1) - M- (E8-4)	Below 1 Ω

      Check for short 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      M+ (T2-2) or M+ (E8-5) - Body ground	10 kΩ or higher
      M- (T2-1) or M- (E8-4) - Body ground	10 kΩ or higher

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

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 2: Identifying Throttle Control Motor And ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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: 

      Normal 

   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: 

      The throttle valve opens and closes smoothly. 

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

   OK: REPLACE ECM  (See REMOVAL  )