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Fuel Injector Circuit: Procedure

  1. INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE) 
    1. Disconnect the fuel injector assembly connectors.
      Fig 1: Identifying Fuel Injector Connector Terminals
      GTY347354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      C1-1 - Body ground Ignition switch ON 11 to 14 V
      C2-1 - Body ground Ignition switch ON 11 to 14 V
      C3-1 - Body ground Ignition switch ON 11 to 14 V
      C8-1 - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Fuel Injector)

    NG → See step   4 

    OK: Go to next step 

  2. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME) 
    1. Check the fuel injector injection and volume. Refer to INSPECTION .

    NG → See step   6 

    OK: Go to next step 

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      C1-2 - B8-86 (#10) Always Below 1 Ω
      C2-2 - B8-85 (#20) Always Below 1 Ω
      C3-2 - B8-84 (#30) Always Below 1 Ω
      C8-2 - B8-83 (#40) Always Below 1 Ω
      C1-2 or B8-86 (#10) - Body ground Always 10 kΩ or higher
      C2-2 or B8-85 (#20) - Body ground Always 10 kΩ or higher
      C3-2 or B8-84 (#30) - Body ground Always 10 kΩ or higher
      C8-2 or B8-83 (#40) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   7 

  4. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY) 
    1. Disconnect the fuel injector assembly connector.
    2. Remove the integration relay.
    3. Disconnect the integration relay connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C1-1 - 1E-4 Always Below 1 Ω
      C2-1 - 1E-4 Always Below 1 Ω
      C3-1 - 1E-4 Always Below 1 Ω
      C8-1 - 1E-4 Always Below 1 Ω
      C1-1 or 1E-4 - Body ground Always 10 kΩ or higher
      C2-1 or 1E-4 - Body ground Always 10 kΩ or higher
      C3-1 or 1E-4 - Body ground Always 10 kΩ or higher
      C8-1 or 1E-4 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   5 

  5. CHECK ECM POWER SOURCE CIRCUIT. Refer to  ECM Power Source Circuit  
  6. REPLACE FUEL INJECTOR ASSEMBLY. Refer to  REMOVAL 
  7. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
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