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Fuel Injector Circuit [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY) 
    1. Disconnect the fuel injector assembly connectors.
      GTY397006Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      D25-1 - Body ground Power switch on (IG) 11 to 14 V
      D30-1 - Body ground Power switch on (IG) 11 to 14 V
      F1-1 - Body ground Power switch on (IG) 11 to 14 V
      F2-1 - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

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

    NG → See step   4 

    OK: Go to next step 

  2. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME) 
    1. Check the fuel injector assembly injection and volume. Refer to INSPECTION [08/2013 - ] .

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly. Refer to INITIALIZATION [08/2013 - ] .

    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 connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D25-2 - D24-20 (#10) Always Below 1 Ω
      D30-2 - D24-17 (#20) Always Below 1 Ω
      F1-2 - D24-18 (#30) Always Below 1 Ω
      F2-2 - D24-19 (#40) Always Below 1 Ω
      D25-2 or D24-20 (#10) - Body ground Always 10 kΩ or higher
      D30-2 or D24-17 (#20) - Body ground Always 10 kΩ or higher
      F1-2 or D24-18 (#30) - Body ground Always 10 kΩ or higher
      F2-2 or D24-19 (#40) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   7 

  4. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY) 
    1. Disconnect the fuel injector assembly connectors.
    2. Remove the No. 1 integration relay from the engine room relay block and junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D25-1 - 1A-3 Always Below 1 Ω
      D30-1 - 1A-3 Always Below 1 Ω
      F1-1 - 1A-3 Always Below 1 Ω
      F2-1 - 1A-3 Always Below 1 Ω
      D25-1 or 1A-3 - Body ground Always 10 kΩ or higher
      D30-1 or 1A-3 - Body ground Always 10 kΩ or higher
      F1-1 or 1A-3 - Body ground Always 10 kΩ or higher
      F2-1 or 1A-3 - 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 [08/2013 - ]  
  6. REPLACE FUEL INJECTOR ASSEMBLY. Refer to  REMOVAL [08/2013 - ] 
  7. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2013 - ] 
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