Inspection Procedure

HINT:

Read freeze frame data using Techstream. 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.

1. INSPECT FUSE (ETCS FUSE) 
   1. Remove the ETCS fuse from the engine room relay block.
   2. Check the resistance of the ETCS fuse.

      Standard resistance: 

      Below 1 Ω 

   3. Reinstall the ETCS fuse.

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

   Fig 1: Identifying ETCS Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step. 

2. CHECK ECM (+BM VOLTAGE) 
   1. Measure the voltage between the specified terminals of the E5 and E7 ECM connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      E7-5 (+BM) - E5-28 (E1)	9 to 14 V

   OK: REPLACE ECM 

   Fig 2: Identifying ECM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to next step. 

3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   1. Check the harness and the connectors between the ETCS fuse and the ECM connector.
      1. Remove the ETCS fuse from the engine room relay block.
         Fig 3: Identifying Engine Room Relay Block

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the E7 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

         Standard resistance (Check for open) 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connection	Specified Condition
         2 (ETCS fuse) - E7-5 (+BM)	Below 1 Ω

         Standard resistance (Check for short) 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connection	Specified Condition
         2 (ETCS fuse) or + E7-5 (BM) - Body ground	10 kΩ or higher

      4. Reinstall the ETCS fuse.
      5. Reconnect the ECM connector.
         Fig 4: Identifying E7 ECM Connector

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Check the harness and the connectors between the ETCS fuse and the battery.
      1. Remove the ETCS fuse from the engine room relay block.
      2. Disconnect the positive battery terminal.
      3. Measure the resistance according to the value(s) in the table below.

         Standard resistance (Check for open) 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connection	Specified Condition
         Battery positive terminal - 1 (ETCS fuse)	Below 1 Ω

         Standard resistance (Check for short) 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connection	Specified Condition
         Battery positive terminal or 1 (ETCS fuse) - Body ground	10 kΩ or higher

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

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: CHECK AND REPLACE FUSIBLE LINK BLOCK ASSEMBLY