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Home >> Lexus >> 2023 >> LX 600 Premium >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (W/O Canister Pump Module) - Diagnostic Codes (4 Of 5) >> SFI SYSTEM (w/o 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 ON-VEHICLE 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) (FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY). 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

    1. Disconnect the ECM connector.
    2. Disconnect the fuel pump assembly (for high pressure side) connector.

      Procedure1

    3. 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

    4. None

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR