Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. 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 FUSE) 
   1. Remove the ETCS fuse from the engine room R/B and J/B.
      Fig 1: Checking Fuse (ETCS Fuse)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Check the ETCS fuse resistance.

      Standard resistance: Below 1  

   3. Reinstall the ETCS fuse.

   NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

   OK: Go to Next Step 

2. INSPECT ECM (+BM VOLTAGE) 
   1. Measure the voltage between the terminals of the A24 and B47 ECM connectors.
      Fig 2: Inspecting ECM

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      +BM (A24-7) - E1 (B47-1)	9 to 14 V

   OK: CHECK FOR INTERMITTENT PROBLEMS 

   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.
      Fig 3: Disconnecting A24 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the ETCS fuse from the engine room R/B and J/B.
      2. Disconnect the A24 ECM connector.
      3. Check the resistance.

         Standard resistance (Check for open) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) - +BM (A24-7)	Below 1

         Standard resistance (Check for short) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) or +BM (A24-7) - Body ground	10 k or higher

      4. Reconnect the ECM connector.
   2. Check the harness and connector between the ETCS fuse and positive battery cable.
      1. Disconnect the negative battery cable.
      2. Check the resistance.

         Standard resistance (Check for open) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         Positive battery cable - ETCS fuse (1)	Below 1

         Standard resistance (Check for short) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         Positive battery cable or ETCS fuse (1) - Body ground	10 k or higher

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

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM