Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 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 Engine Room Relay Block

   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 

      Fig 2: Measuring Voltage Between Specified Terminals Of E5 And E7 ECM Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

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

   OK : REPLACE ECM 

   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: Removing ETCS Fuse From Engine Room Relay Block

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the E7 ECM connector.
      3. Measure the resistance between the wire harness side connectors.

         Standard resistance (Check for open) 

         TESTER CONNECTION AND SPECIFIED CONDITION
         
         

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

         Standard resistance (Check for short) 

         TESTER CONNECTION AND SPECIFIED CONDITION
         
         

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

         Fig 4: Disconnecting E7 ECM Connector

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Reinstall the ETCS fuse.
      5. Reconnect the ECM connector.
   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 between the wire harness side connectors.

         Standard resistance (Check for open) 

         TESTER CONNECTION AND SPECIFIED CONDITION
         
         

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

         Standard resistance (Check for short) 

         TESTER CONNECTION AND 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 AND CONNECTOR 

   OK : CHECK AND REPLACE FUSIBLE LINK BLOCK ASSEMBLY