Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester. 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 R/B.
   2. Check for continuity in the ETCS fuse.

      Standard: Continuity 

   3. Reinstall the ETCS fuse.
      Fig 1: Checking Fuse (ETCS Fuse)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   OK: Go to next step. 

2. INSPECT ECM (+BM VOLTAGE) 
   1. Check the voltage between the terminals of the E7 and E9 ECM connectors.

      Standard: 

      ECM (+BM VOLTAGE)
      
      

      Tester Connection	Specified Condition
      +BM (E9-7) - E1 (E7-1)	9 to 14 V

   Fig 2: Inspecting ECM (+BM Voltage)

   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 connector between the ETCS fuse and ECM.
      1. Remove the ETCS fuse from the engine room R/B.
      2. Disconnect the E9 ECM connector.
      3. Check the resistance between the wire harness side connectors.
         Fig 3: Identifying ETCS Fuse

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         Standard (Check for open): 

         ETCS FUSE AND ECM (CHECK FOR OPEN)
         
         

         Tester Connection	Specified Condition
         Engine room R/B (ETCS fuse terminal 2) - +BM (E9-7)	Below 1 Ω

         Standard (Check for short): 

         ETCS FUSE AND ECM (CHECK FOR SHORT)
         
         

         Tester Connection	Specified Condition
         Engine room R/B (ETCS fuse terminal 2) or +BM (E9-7) - Body ground	10 kΩ or higher

         Fig 4: Checking Harness And Connector (ECM - ETCS Fuse, ETCS Fuse - Battery)

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Reinstall the ETCS fuse.
      5. Reconnect the ECM.
   2. Check the harness and connector between the ETCS fuse and battery.
      1. Remove the ETCS fuse from the engine room R/B.
      2. Disconnect the negative battery cable.
      3. Check the resisntance between the wire harness side connectors.

         Standard (Check for open): 

         ETCS FUSE AND BATTERY (CHECK FOR OPEN)
         
         

         Tester Connection	Specified Condition
         Positive battery cable - Engine room R/B (ETCS fuse terminal 1)	Below 1 Ω

         Standard (Check for short): 

         ETCS FUSE AND BATTERY (CHECK FOR SHORT)
         
         

         Tester Connection	Specified Condition
         Positive battery cable or Engine room R/B (ETCS fuse terminal 1) - Body ground	10 kΩ or higher

      4. Reinstall the ETCS fuse.
      5. Reconnect the negative battery cable.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM (See  REPLACEMENT  )