Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester. Freeze frame data records 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 FUSE) 
   1. Remove the ETCS fuse from the engine room R/B and J/B.
   2. Check the ETCS fuse resistance.

      Standard: Below 1 Ω 

   3. Reinstall the ETCS fuse.
      Fig 1: Locating ETCS Fuse

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FUSE, AND REPLACE FUSE 
   2. OK: Go to Next Step. 
2. INSPECT ECM (+BM VOLTAGE) 
   1. Measure the voltage between the terminals of the A24 and B47 ECM connectors.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      +BM (A24-7) - E1 (B47-1)	9 to 14 V

      Fig 2: Measuring Voltage Between Terminals Of A24 And B47 ECM Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: CHECK FOR INTERMITTENT PROBLEMS (see  CHECK FOR INTERMITTENT PROBLEMS   ) 
   2. 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 R/B and J/B.
      2. Disconnect the A24 ECM connector.
      3. Check the resistance.
         Fig 3: Locating ETCS Fuse

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

         Standard (Check for open): 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) - +BM (A24-7)	Below 1 Ω

         Standard (Check for short): 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

         Tester Connections	Specified Conditions
         ETCS fuse (2) or +BM (A24-7) - Body ground	10 kΩ or higher

      4. Reconnect the ECM connector.
      Fig 4: Connecting ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Check the harness and connector between the ETCS fuse and positive battery cable.
      1. Disconnect the negative battery cable.
      2. Check the resistance.

         Standard (Check for open): 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

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

         Standard (Check for short): 

         TESTER CONNECTION SPECIFIED CONDITION
         
         

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

      3. Reinstall the ETCS fuse.
      4. Reconnect the negative battery cable.
   1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   2. OK: REPLACE ECM (SEE  REPLACEMENT  )