Inspection Procedure

HINT:

Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 engine room R/B.
   2. Check the ETCS fuse resistance.

      Standard Resistance: 

      Below 1 Ω 

   3. Reinstall the ETCS fuse.
   Fig 1: Checking Fuse (ETCS)
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

   OK: Go to Next Step 

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

      Standard Voltage 

      VOLTAGE CHART
      
      

      Tester Connections	Specified Conditions
      +BM (E8-7) - E1 (E4-3)	9 to 14 V

   Fig 2: Inspecting ECM
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   OK : CHECK FOR INTERMITTENT PROBLEMS 

   NG: Go to Next Step 

3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, 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 E8 ECM connector.
      3. Check the resistance.

         Standard Resistance (Check for open) 

         RESISTANCE REFERENCE CHART
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) - +BM (E8-7)	Below 1Ω

         Standard Resistance (Check for short): 

         RESISTANCE REFERENCE CHART
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) or +BM (E8-7) - 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) 

         RESISTANCE REFERENCE CHART
         
         

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

         Standard Resistance (Check for short) 

         RESISTANCE REFERENCE CHART
         
         

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

      4. Reinstall the ETCS fuse.
      5. Reconnect the positive battery cable.
   Fig 3: Identifying ETCS Fuse And Engine Room R/B
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE ECM