Inspection Procedure

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK FUSE (ETCS) 
   1. Remove the ETCS fuse from the engine room relay block.
   2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

   3. Reinstall the ETCS fuse.

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

   OK: Go to Next Step 

   Fig 1: Identifying ETCS Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. INSPECT ECM (+BM VOLTAGE) 
   1. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      +BM (E4-7) - E1 (E8-3)	9 to 14 V

   NG: Go to step 3 

   OK: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS   ) 

   Fig 2: Inspecting ECM (+BM Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. CHECK WIRE HARNESS (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   1. Check the wire harness between the ETCS fuse and ECM.
      1. Remove the ETCS fuse from the engine room relay block.
      2. Disconnect the E4 ECM connector.
      3. Measure the resistance according to the value (s) in the table below.

         Standard resistance 

         TESTER CONNECTION SPECIFIED CONDITION CHART
         
         

         Tester Connection	Specified Condition
         ETCS fuse (2) - +BM (E4-7)	Below 1 Ω
         ETCS fuse (2) or +BM (E4-7) - Body ground	10 kΩ or higher

      4. Reinstall ETCS fuse.
      5. Reconnect the ECM connector.
   2. Check the wire harness between the ETCS fuse and positive (+) battery cable.
      1. Remove the ETCS fuse from the engine room relay block.
      2. Disconnect the cable from the positive (+) battery cable.
      3. Measure the resistance according to the value (s) in the table below.
         Fig 3: Identifying BM Terminal Of ECM Connector With ETCS Fuse

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         Standard resistance 

         TESTER CONNECTION SPECIFIED CONDITION CHART
         
         

         Tester Connection	Specified Condition
         Positive battery cable terminal - ETCS fuse (1)	Below 1 Ω
         Positive battery cable terminal or ETCS fuse (1) - Body ground	10 kΩ or higher

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

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM  (See REMOVAL )