Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a 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. CHECK FUSE (ETCS FUSE) 
   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.
      Fig 1: Identifying ETCS Fuse

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   OK: GO TO NEXT STEP 

2. INSPECT ECM (+BM VOLTAGE) 
   1. Measure the voltage between the specified terminals of the E7 and E8 ECM connectors.

   Standard: 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   +BM (E7-6) - E1 (E8-1)	9 to 14 V

   Fig 2: Identifying ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE ECM (See  REPLACEMENT  ) 

   NG: GO TO NEXT STEP 

3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   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 E7 ECM connector.
      3. Check the resistance between the wire harness side connectors.

         Standard (Check for open): 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connection	Specified Condition
         ETCS fuse (2) - +BM (E7-6)	Below 1 Ω

         Standard (Check for short): 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connection	Specified Condition
         ETCS fuse (2) or +BM (E7-6) - Body ground	10 kΩ or higher

      4. Reinstall the ETCS fuse.
      5. Reconnect the E7 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 positive battery cable.
      3. Check the resistance between the wire harness side connectors.

         Standard (Check for open): 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

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

         Standard (Check for short): 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

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

      4. Reinstall the ETCS fuse.
      5. Reconnect the positive battery cable.
   Fig 3: Identifying ETCS Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 4: Identifying ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: CHECK ENGINE ROOM JUNCTION BLOCK ASSY