Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool. 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. CHECK FUSE (ETCS FUSE) 
   Fig 1: Checking Resistance Of ETCS Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Remove the ETCS fuse from the engine room R/B.
   2. Check the resistance of the ETCS fuse.

      Standard: Below 1 Ω 

   3. Reinstall the ETCS fuse.

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

   OK: Go To Next Step 

2. INSPECT ECM (+BM VOLTAGE) 
   Fig 2: Identifying E5 And E7 ECM Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Measure the voltage between the specified terminals of the E5 and E7 ECM connectors.

   Standard: 

   TESTER CONNECTION & SPECIFIED CONDITION
   
   

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

   OK: REPLACE ECM (See  ENGINE CONTROL SYSTEM  ) 

   NG: Go To Next Step 

3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   Fig 3: Identifying ETCS Fuse Engine Room

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Check the harness and the connectors between the ETCS fuse and the ECM connector.
      1. Remove the ETCS fuse from the engine room R/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 (E7-5)	Below 1 Ω

         Fig 4: Identifying E7 ECM Connector

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         Standard (Check for short): 

         TESTER CONNECTION & SPECIFIED CONDITION
         
         

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

      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 R/B.
      2. Disconnect the positive battery terminal.
      3. Check the resistance between the wire harness side connectors.

         Standard (Check for open): 

         TESTER CONNECTOR & 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 terminal.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: CHECK AND REPLACE FUSIBLE LINK BLOCK ASSY