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) 
   1. Remove the ETCS fuse from the engine room relay block.
   2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

   NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 

   Fig 1: Identifying ETCS Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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 

      ECM TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      +BM (E4-7) - E1 (ES-3)	9 to 14 V

   NG: Go to step 3 

   Fig 2: Inspecting ECM (+BM Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: CHECK FOR INTERMITTENT PROBLEMS 

3. CHECK WIRE HARNESS (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   1. Check the wire harness between the ETCS fuse and ECM.
      1. Remove the ETCS fuse from the engine room relay block.
      2. Disconnect the E4 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

         Standard resistance 

         WIRE HARNESS TESTER CONNECTION AND SPECIFIED CONDITION
         
         

         Tester Connection	Specified Condition
         ETCS fuse (2) - +BM (E4-7)	Below 1 Ω
         ETCS fuse (2) or +BM (E4-7) - Body ground	10 kΩ or higher

   2. Check the wire harness between the ETCS fuse and positive (+) battery cable.
      1. Remove the ETCS fuse from the engine room relay block.
      2. Disconnect the cable from the positive (+) battery cable.
      3. Measure the resistance according to the value(s) in the table below.

         Standard resistance 

         WIRE HARNESS TESTER CONNECTION AND SPECIFIED CONDITION
         
         

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

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 3: Disconnecting E4 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE ECM