Inspection Procedure

HINT:

• Read freeze frame data using an intelligent tester. The ECM (Included in HV control ECU) records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 the intelligent tester. However, the ECM shuts off the throttle actuator current when the ETCS malfunctions.

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

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

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

   3. Reconnect the throttle body connector.

   NG: REPLACE THROTTLE BODY ASSEMBLY 

   Fig 1: Identifying T2 Throttle Body Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

2. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - HV CONTROL ECU) 
   1. Disconnect the T2 throttle body connector.
   2. Disconnect the H31 HV control ECU connector.
   3. Measure the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      M+ (T2-2) - M+ (H31-3)	Below 1 Ω
      M- (T2-1) - M- (H31-2)	Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      M+ (T2-2) or M+ (H31-3) - Body ground	10 kΩ or higher
      M- (T2-1) or M- (H31-2) - Body ground	10 kΩ or higher

   4. Reconnect the throttle body connector.
   5. Reconnect the HV control ECU connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 2: Identifying T2 Throttle Body Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

3. INSPECT THROTTLE BODY ASSEMBLY 
   1. Check for foreign objects between the throttle valve and the housing.

      OK: No foreign objects. 

   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 BODY ASSEMBLY 

   OK: REPLACE HV CONTROL ECU