Inspection Procedure

HINT:

Read freeze frame data using the Techstream. Freeze frame data records 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.

1. INSPECT FUSE (ETCS) 
   1. Remove the ETCS fuse from the engine room relay block.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      ETCS fuse	Always	Below 1 Ω

      Fig 1: Identifying ETCS Fuse

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

   OK: Go to next step. 

2. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   1. Check the harness and connector between the ETCS fuse and ECM.
      1. Remove the ETCS fuse from the engine room relay block.
      2. Disconnect the C53 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

         Standard Resistance 

         STANDARD RESISTANCE SPECIFICATION
         
         

         Tester Connection	Condition	Specified Condition
         ETCS fuse terminal 2 - C53-41 (+BM)	Always	Below 1 Ω
         ETCS fuse terminal 2 or C53-41 (+BM) - Body ground	Always	10 kΩ or higher

   2. Check the harness and connector between the ETCS fuse and positive battery cable.
      1. Remove the ETCS fuse from the engine room relay block.
      2. Disconnect the cable from the positive (+) battery terminal.
      3. Measure the resistance according to the value(s) in the table below.

         Standard Resistance 

         STANDARD RESISTANCE SPECIFICATION
         
         

         Tester Connection	Condition	Specified Condition
         Positive battery cable - ETCS fuse terminal 1	Always	Below 1 Ω
         Positive battery cable or ETCS fuse terminal 1 - Body ground	Always	10 kΩ or higher

         Fig 2: Identifying ETCS Fuse And C53 ECM Connector

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step. 

3. INSPECT ECM (+BM VOLTAGE) 
   1. Disconnect the C53 ECM connector.
   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      C53-41 (+BM) - C53-81 (E1)	Always	11 to 14 V

   Fig 3: Identifying C53 ECM Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (TERMINAL E1 - BODY GROUND) 

   OK: REPLACE ECM  (See ECM )