Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

1. CHECK FUSE (ETCS FUSE) 
   Fig 1: Locating ETCS Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Remove the ETCS fuse from the engine room J/B.
   2. Check for continuity in the ETCS fuse.

      Standard: Continuity 

   3. Reinstall the ETCS fuse.
   1. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE 
   2. OK: GO TO NEXT STEP 
2. INSPECT ECM (+BM VOLTAGE) 
   Fig 2: Measuring Voltage Between Terminals Of E5 & E8 ECM Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Check the voltage between the terminals of the E5 and E6 ECM connectors.

   Standard: 

   SPECIFIED CONDITION
   
   

   Symbols (Terminal No.)	Specified condition
   +BM (E5-6) - E1 (E6-1)	9 to 14 V

   1. OK: CHECK AND REPLACE ECM (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
   2. NG: GO TO NEXT STEP 
3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   Fig 3: Locating ETCS Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Check the harness and the connector between the ETCS fuse and the ECM.
      1. Remove the ETCS fuse from the engine room J/B.
      2. Disconnect the E5 ECM connector.
      3. Check for continuity between the wire harness side connectors.

         Standard (Check for open): 

         SPECIFIED CONDITION
         
         

         Symbols (Terminal No.)	Specified condition
         ETCS fuse (2) - +BM (E5-6)	Continuity

         Standard (Check for short): 

         SPECIFIED CONDITION
         
         

         Symbols (Terminal No.)	Specified condition
         ETCS fuse (2) or +BM (E5-6) - Body ground	No continuity

      4. Reinstall the ETCS fuse.
      5. Reconnect the ECM connector.
   2. Check the harness and the connector between the ETCS fuse and the battery.
      1. Remove the ETCS fuse from the engine room J/B.
      2. Disconnect the battery positive terminal.
      3. Check for continuity between the wire harness side connectors.
         Fig 4: Disconnecting E5 ECM Connector

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         Standard (Check for open): 

         SPECIFIED CONDITION
         
         

         Symbols (Terminal No.)	Specified condition
         Battery positive terminal - ETCS fuse	Continuity

         Standard (Check for short): 

         SPECIFIED CONDITION
         
         

         Symbols (Terminal No.)	Specified condition
         Battery positive terminal or ETCS fuse - Body ground	No continuity

      4. Reinstall the ETCS fuse.
      5. Reconnect the battery positive terminal.
   1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   2. OK: CHECK AND REPLACE ENGINE ROOM JUNCTION BLOCK ASSY