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 J/B.
      Fig 1: Identifying ETCS Fuse

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

      Standard resistance: Below 1 Ω 

   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 ECM connectors.
      Fig 2: Identifying E6 And E4 Connectors Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      +BM (E4-7) - E1 (E6-1)	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.
      1. Remove the ETCS fuse from the engine room J/B.
      2. Disconnect the ECM connector.
      3. Measure the resistance.

         Standard resistance: 

         Check for open 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connection	Specified Condition
         ETCS fuse (2) - +BM (E4-7)	Below 1 Ω

         Check for short 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

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

      4. Reconnect the ECM connector.
   2. Check the harness and connector between the ETCS fuse and positive battery cable.
      Fig 3: Checking Harness And Connector (ECM - ETCS Fuse, ETCS Fuse - Battery)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the negative battery cable.
      2. Measure the resistance.

         Standard resistance: 

         Check for open 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

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

         Check for short 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

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

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

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM (See  REMOVAL   )