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. CHECK FUSE (ETCS) 
   1. Remove the ETCS fuse from the engine room No. 2 junction block.
   2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      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 SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

   OK: Go to Next Step 

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

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E1-1 (+BM) - E3-1 (E1)	Always	11 to 14 V

      Fig 2: Identifying Terminals Of E1 And E3 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS )

   NG: Go to Next Step 

3. 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 No. 2 junction block.
      2. Disconnect the E1 ECM connector.
      3. Measure the resistance according to the value (s) in the table below.

         Standard Resistance (Check for open) 

         TESTER CONNECTION SPECIFIED CONDITION CHART
         
         

         Tester Connection	Condition	Specified Condition
         ETCS fuse (2) - E1-1 (+BM)	Always	Below 1 Ω

         Standard Resistance (Check for short) 

         TESTER CONNECTION SPECIFIED CONDITION CHART
         
         

         Tester Connection	Condition	Specified Condition
         ETCS fuse (2) or E1-1 (+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 No. 2 junction block.
      2. Disconnect the positive battery cable.
      3. Measure the resistance according to the value (s) in the table below.
         Fig 3: Identifying ETCS Fuse

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         Standard Resistance (Check for open) 

         TESTER CONNECTION SPECIFIED CONDITION CHART
         
         

         Tester Connection	Condition	Specified Condition
         Positive battery cable - ETCS fuse (1)	Always	Below 1 Ω

         Standard Resistance (Check for short) 

         TESTER CONNECTION SPECIFIED CONDITION CHART
         
         

         Tester Connection	Condition	Specified Condition
         Positive battery cable or ETCS fuse (1) - Body ground	Always	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM  (See REMOVAL )