Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester or the OBD II scan tool. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. CHECK FUSE (ETCS) 
   1. Remove the ETCS fuse from the fusible link block.
   2. Measure the resistance of the ETCS fuse.

   Standard resistance: Below 1 Ω 

   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 of the ECM connectors.

   Standard voltage 

   ECM (+BM VOLTAGE)
   
   

   Tester Connection	Specified Condition
   E6-6 (+BM) - E7-1 (E1)	9 to 14 V

   Fig 2: Inspecting ECM (+BM Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE ECM 

   NG : Go to next step 

3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY) 
   1. Check the harness and the connector between the ETCS fuse and ECM.
      1. Remove the ETCS fuse from the fusible link block.
      2. Disconnect the E6 ECM connector.
      3. Measure the resistance of the wire harness side connectors.

         Standard resistance 

         ECM - ETCS FUSE
         
         

         Tester Connection	Specified Condition
         ETCS fuse terminal 2 - E6-6 (+BM)	Below 1 Ω
         ETCS fuse terminal 2 or E6-6 (+BM) - Body ground	10 kΩ or higher

   2. Check the harness and the connector between the ETCS fuse and battery.
      1. Remove the ETCS fuse from the fusible link block.
      2. Disconnect the battery's positive cable.
      3. Measure the resistance of the wire harness side connectors.

         Standard resistance 

         ETCS FUSE - BATTERY
         
         

         Tester Connection	Specified Condition
         Battery positive cable - ETCS fuse terminal 1	Below 1 Ω
         Battery positive cable or ETCS fuse terminal 1 - Body ground	10 kΩ or higher

         Fig 3: Checking Harness And Connector (ECM - ETCS Fuse, ETCS Fuse - Battery)

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Reinstall the ETCS fuse.
   4. Reconnect the ECM connector.

      NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK : CHECK AND REPLACE FUSIBLE LINK BLOCK ASSEMBLY