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 (See FREEZE FRAME DATA ).

1. CHECK FUSE (ETCS FUSE) 
   1. Remove the ETCS fuse from the engine room J/B and R/ B No. 2.
   2. Measure the resistance of the ETCS fuse.

      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 according to the value (s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      +BM (E3-5) - E1 (E4-7)	9 to 14 V

      Fig 2: Identifying ECM Connector Terminals

      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 J/B and R/B No. 2.
      2. Disconnect the E3 ECM connector.
      3. Measure the resistance according to the value (s) in the table below.

         Standard resistance (Check for open) 

         RESISTANCE SPECIFICATION
         
         

         Tester Connection	Specified Condition
         ETCS fuse (2) - +BM (E3-5)	Below 1 Ω

         Standard resistance (Check for short) 

         RESISTANCE SPECIFICATION
         
         

         Tester Connection	Specified Condition
         ETCS fuse (2) or +BM (E3-5) - 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 J/B and R/B No. 2.
      2. Disconnect the positive battery cable.
      3. Measure the resistance according to the value (s) in the table below.

         Standard resistance (Check for open) 

         RESISTANCE SPECIFICATION
         
         

         Tester Connection	Specified Condition
         Positive battery cable - ETCS fuse (1)	Below 1 Ω

         Fig 3: Identifying E3 ECM Connector

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         Standard resistance (Check for short) 

         RESISTANCE SPECIFICATION
         
         

         Tester Connection	Specified Condition
         Positive battery cable 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