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Home >> Lexus >> 2023 >> LX 600 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (W/ Canister Pump Module) - Diagnostic Codes (7 Of 9) >> SFI SYSTEM (w/ Canister Pump Module) >> DTC P1235-13: High Pressure Fuel Pump Circuit Open [12/2021 - ] >> Procedure
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DTC P1235-13: High Pressure Fuel Pump Circuit Open [12/2021 - ]: Procedure

  1. INSPECT FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE) 

    Refer to INSPECTION [12/2021 - ]

    HINT: 

    Perform "Inspection After Repair" after replacing the fuel pump assembly (for high pressure side).

    Refer to INITIALIZATION [12/2021 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE). Refer to  REMOVAL [12/2021 - ] 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE) - ECM) 

    Pre-procedure1

    • Disconnect the ECM connector.
    • Disconnect the fuel pump assembly (for high pressure side) connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C43-2 (FP+) - C37-11 (FP1+) Always Below 1 Ω
      C43-1 (FP-) - C37-10 (FP1-) Always Below 1 Ω
      C43-2 (FP+) or C37-11 (FP1+) - Body ground and other terminals Always 10 kΩ or higher
      C43-1 (FP-) or C37-10 (FP1-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [12/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR