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.

1. CHECK FUSE (ETCS FUSE) 
   1. Remove the ETCS fuse from the engine room R/B.
   2. Check the ETCS fuse resistance.

      Standard resistance: 

      Below 1 Ω 

   3. Reinstall the ETCS fuse.
   Fig 1: Identifying ETCS Fuse
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED TO FUSE 

   OK: Go to Next Step 

2. INSPECT ECM (+BM VOLTAGE) 
   1. Measure the voltage between the terminals of the E8 and E6 ECM connectors.

      Standard Voltage 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      +BM (E8-7) - E1 (E6-1)	9 to 14 V

   Fig 2: Inspecting ECM (+BM Voltage)
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : 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 R/B.
      2. Disconnect the E8 ECM connector.
      3. Check the resistance.

         Standard Resistance (Check for open) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) - +BM (E8-7)	Below 1 Ω

         Standard Resistance (Check for short) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) or +BM (E8-7) - Body ground	10 kΩ or higher

      4. Reinstall the ETCS fuse.
      5. Reconnect the ECM connector.
         Fig 3: Checking Harness And Connector (ECM - ETCS Fuse, ETCS Fuse - Battery)

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Check the harness and connector between the ETCS fuse and positive battery cable.
      1. Remove the ETCS fuse from the engine room R/B.
      2. Disconnect the positive battery cable.
      3. Check the resistance.

         Standard Resistance (Cheek for open) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         Positive battery cable - ETCS fuse (1)	Below 1 Ω

         Standard Resistance (Check for short) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         Positive battery cable or ETCS fuse (1) - Body ground	10 kΩ or higher

      4. Reinstall the ETCS fuse.
      5. Reconnect the positive battery cable.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE ECM