Inspection Procedure

HINT:

Read freeze frame data using 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 (See DTC CHECK/CLEAR  ).

1. CHECK FUSE (ETCS FUSE) 
   1. Remove the ETCS fuse from the engine room R/B.
   2. Measure the resistance of the ETCS fuse.

      Standard resistance: 

      Below 1 Ω 

   3. Reinstall the ETCS fuse.

      NG: REPLACE ETCS FUSE 

      Fig 1: Identifying ETCS Fuse On Engine Room R/B

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

2. INSPECT ECM (+BM VOLTAGE) 
   1. Disconnect the ECM connector.
   2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      +BM (A55-3) - Body ground	9 to 14 V

   3. Reconnect the ECM connector.

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

      Fig 2: Identifying +BM Terminal Of A55 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

         Standard resistance (Check for open) 

         RESISTANCE SPECIFIED CONDITIONS
         
         

         Tester Connection	Specified Condition
         Engine room R/B ETCS fuse terminal 2 - +BM (A55-3)	Below 1 Ω

         Standard resistance (Check for short) 

         RESISTANCE SPECIFIED CONDITIONS
         
         

         Tester Connection	Specified Condition
         Engine room R/B ETCS fuse terminal 2 or +BM (A55-3) - Body ground	10 kΩ or higher

      4. Reinstall the ETCS fuse.
      5. Reconnect the ECM connector.
   2. Check the harness and connector between the ETCS fuse and positive battery cable.
      1. Remove the ETCS fuse from the engine room R/B.
      2. Disconnect the negative battery terminal.
      3. Disconnect the positive battery terminal.
      4. Measure the resistance according to the value(s) in the table below.

         Standard resistance (Check for open) 

         RESISTANCE SPECIFIED CONDITIONS
         
         

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

         Fig 3: Identifying ETCS Fuse And A55 ECM Connector Terminals

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         Standard resistance (Check for short) 

         RESISTANCE SPECIFIED CONDITIONS
         
         

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

      5. Reinstall the ETCS fuse.
      6. Reconnect the positive battery terminal.
      7. Reconnect the negative battery terminal.

         NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

         OK: REPLACE ECM (See  REMOVAL   )