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Home › Toyota › 2007 › Tundra Base, 5.7 V, 4WD › Repair and Diagnosis › Engine Performance › System › Engine Control System (3UR-FE) - System Testing, Removal & Installation › Fuel Injector Circuit › Inspection Procedure

Inspection Procedure

  1. CHECK INJECTOR ASSEMBLY (POWER SOURCE) 
    1. Disconnect the injector connector.
    2. Turn the ignition switch ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      INJECTOR ASSEMBLY (POWER SOURCE)

      Cylinder Tester Connection Switch Condition Specified Condition
      No. 1 H1-2 - Ground Ignition switch ON 11 to 14 V
      No. 2 F1-2 - Ground Ignition switch ON 11 to 14 V
      No. 3 H2-2 - Ground Ignition switch ON 11 to 14 V
      No. 4 F2-2 - Ground Ignition switch ON 11 to 14 V
      No. 5 H3-2 - Ground Ignition switch ON 11 to 14 V
      No. 6 F3-2 - Ground Ignition switch ON 11 to 14 V
      No. 7 H4-2 - Ground Ignition switch ON 11 to 14 V
      No. 8 F4-2 - Ground Ignition switch ON 11 to 14 V
      Fig 1: Checking Injector Assembly (Power Source)
      G05149973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  4

    OK: Go to next step 

  2. INSPECT INJECTOR ASSEMBLY 
    1. Inspect the injector (see INSPECTION ).

    NG: REPLACE INJECTOR ASSEMBLY  (See REMOVAL )

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - ECM) 
    1. Disconnect the injector connector.
    2. Disconnect the D74 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      INJECTOR ASSEMBLY - ECM

      Cylinder Tester Connection Condition Specified Condition
      No. 1 H1-1 - Body ground Always 10 kΩ or higher
      H1-1 - D74-86 (#10) Always Below 1 Ω
      No. 2 F1-1 - Ground Always 10 kΩ or higher
      F1-1 - D74-109 (#20) Always Below 1 Ω
      No. 3 H2-1 - Ground Always 10 kΩ or higher
      H2-1 - D74-85 (#30) Always Below 1 Ω
      No. 4 F2-1 - Ground Always 10 kΩ or higher
      F2-1 - D74-108 (#40) Always Below 1 Ω
      No. 5 H3-1 - Ground Always 10 kΩ or higher
      H3-1 - D74-84 (#50) Always Below 1 Ω
      No. 6 F3-1 - Ground Always 10 kΩ or higher
      F3-1 - D74-107 (#60) Always Below 1 Ω
      No. 7 H4-1 - Ground Always 10 kΩ or higher
      H4-1 - D74-83 (#70) Always Below 1 Ω
      No. 8 F4-1 - Ground Always 10 kΩ or higher
      F4-1 -D74-106 (#80) Always Below 1 Ω
      Fig 2: Identifying D74 ECM Connector Terminal
      G05149974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM  (see REMOVAL  )

  4. INSPECT FUSE (INJ, IG2 MAIN) 
    1. Remove the INJ fuse and IG2 MAIN fuse from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      FUSE (INJ, IG2 MAIN)

      Tester Connection Condition Specified Condition
      INJ fuse Always Below 1 Ω
      IG2 fuse Always Below 1 Ω
      Fig 3: Inspecting Fuse (INJ, IG2 Main)
      G05149975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to next step 

  5. INSPECT INTEGRATION RELAY (IG2) 
    1. Inspect the integration relay (see ON-VEHICLE INSPECTION  ).

    NG: REPLACE INTEGRATION RELAY  (see ON-VEHICLE INSPECTION  )

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - INJECTOR ASSEMBLY) 

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