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.

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

      Standard resistance: 

      Below 1 Ω 

   3. Reinstall the ETCS fuse.
      Fig 1: Identifying ETCS Fuse

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE FUSE 

   OK: Go to next step 

2. INSPECT ECM (+BM VOLTAGE) 
   1. Measure the voltage between the terminals of the E3 and E5 ECM connectors.

      Standard voltage 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS
      
      

      Tester Connections	Specified Conditions
      +BM (E5-6) - E1 (E3-5)	Between 9 V and 14 V

      Fig 2: Identifying E3 And E5 ECM Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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.
      1. Remove the ETCS fuse from the engine room R/B.
      2. Disconnect the E5 ECM connector.
      Fig 3: Identifying E5 ECM Connector And ETCS Fuse
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Check the resistance.

         Standard resistance (Check for open) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) - +BM (E5-6)	Below 1 Ω

         Standard resistance (Check for short) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) or +BM (E5-6) - 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 positive battery cable.
      3. Check the resistance.

         Standard resistance (Check for open) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

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

         Standard resistance (Check for short) 

         TESTER CONNECTIONS AND SPECIFIED CONDITIONS
         
         

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

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

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM