SFI SYSTEM, Diagnostic DTC:P1235

DTC Code DTC Name
P1235 High Pressure Fuel Pump Circuit

DESCRIPTION

The fuel pump for high pressure is attached to the insulator, which is attached to the cylinder head cover. The pump activates according to the position of the cam on the exhaust side camshaft (bank 1).

The fuel pump for high pressure increases the pressure of the fuel supplied from the fuel pump in the fuel tank to 2 to 18 MPa (20.4 to 183.5 kgf/cm, 290 to 2609 psi) according to the operating condition, and it feeds the fuel to the fuel delivery pipe.

DTC No. DTC Detection Condition Trouble Area
P1235

Open or short in high pressure side fuel pump circuit for 1 second or more

(1 trip detection logic)

  • Open or short in fuel pump for high pressure

  • Fuel pump for high pressure

  • Injector driver (EDU)

  • ECM

MONITOR STRATEGY

Required Sensors/Components Fuel pump
Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Click here.

  4. Turn the power switch off and wait for 30 seconds.

  5. Turn the power switch on (IG) and turn the GTS on.

  6. Put the engine in inspection mode (maintenance mode) Click here.

  7. Start the engine.

  8. Idle the engine for 10 seconds [A].

  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  10. Read the DTC [C].

    Tech Tips


    • If a DTC is output, the system is malfunctioning.

    • If a DTC is not output, perform the following procedure.

  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  12. Input the DTC: P1235.

  13. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    Tech Tips


    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.

WIRING DIAGRAM

A01FVDBE04

INSPECTION PROCEDURE

Tech Tips


  • If the current from the INJ relay is cut because DTC P062D is stored, DTC P1235 will be stored even if the fuel pump for high pressure is normal.

  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. INSPECT FUEL PUMP FOR HIGH PRESSURE


    1. Inspect the fuel pump for high pressure Click here.


    NG

    REPLACE FUEL PUMP FOR HIGH PRESSURE Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - FUEL PUMP FOR HIGH PRESSURE)


    1. Disconnect the injector driver (EDU) connector.

    2. Disconnect the fuel pump for high pressure connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F37-3 (FP+) - F60-1 (FP+) Always Below 1 Ω
      F37-4 (FP-) - F60-2 (FP-) Always Below 1 Ω
      F37-3 (FP+) or F60-1 (FP+) - Body ground Always 10 kΩ or higher
      F37-4 (FP-) or F60-2 (FP-) - Body ground Always 10 kΩ or higher

    4. Reconnect the injector driver (EDU) connector.

    5. Reconnect the fuel pump for high pressure connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (ECM - INJECTOR DRIVER)


    1. Disconnect the ECM connector.

    2. Disconnect the injector driver (EDU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F5-61 (FPF) - F36-7 (FPF1) Always Below 1 Ω
      F5-63 (FPD) - F36-8 (FPD) Always Below 1 Ω
      F5-61 (FPF) or F36-7 (FPF1) - Body ground Always 10 kΩ or higher
      F5-63 (FPD) or F36-8 (FPD) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the injector driver (EDU) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE INJECTOR DRIVER


    1. Replace the injector driver (EDU) Click here.


    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG) and turn the GTS on.

    3. Clear DTCs Click here.

    4. Turn the power switch off and wait for at least 30 seconds.

    5. Turn the power switch on (IG) and turn the GTS on.

    6. Put the engine in inspection mode (maintenance mode) Click here.

    7. Start the engine and warm it up.

    8. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

    9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

    10. Check the pending DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P1235 is output B

    B

    REPLACE ECM Click here

    A

    END