SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P1235, P1236

DTC Code DTC Name
P1235 High Pressure Fuel Pump Circuit
P1236 High Pressure Fuel Pump No. 2 Circuit

DESCRIPTION

The fuel pump with seal sub-assembly (for high pressure side) 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 intake side camshaft (bank 1 and bank 2). The fuel pump with seal sub-assembly (for high pressure side) 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/cm2, 290 to 580 psi) according to the operating condition, and it feeds the fuel to the fuel delivery pipe.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P1235 High Pressure Fuel Pump Circuit Open or short in fuel pump with seal sub-assembly (for high pressure side of bank1) circuit for 1 second or more (1 trip detection logic).

  • Open or short in fuel pump with seal sub-assembly (for high pressure side of bank1) circuit

  • Fuel pump with seal sub-assembly (for high pressure side of bank1)

  • No. 1 Injector driver

  • ECM

 Comes on DTC stored
P1236 High Pressure Fuel Pump No. 2 Circuit Open or short in fuel pump with seal sub-assembly (for high pressure side of bank2) circuit for 1 second or more (1 trip detection logic).

  • Open or short in fuel pump with seal sub-assembly (for high pressure side of bank2) circuit

  • Fuel pump with seal sub-assembly (for high pressure side of bank2)

  • No. 2 Injector driver

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

The injector driver has the integrated circuit (IC) which monitors the electrical circuit between the spill control valve and injector driver. If an open circuit is detected, the IC sends the malfunction signal (FPD, FPD2) to the ECM. Then, the ECM will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main) Fuel pump with seal sub-assembly (for high pressure side)
Required Sensors/Components (Related) Injector driver
Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

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

  5. Turn the engine switch off and wait for at least 30 seconds.

  6. Turn the engine switch on (IG).

  7. Turn the GTS on.

  8. Start the engine.

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

  10. Enter the following menus: Powertrain / Engine / Trouble Codes [B].

  11. Read the pending DTCs.

    Tech Tips


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

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

  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  13. Input the DTC: P1235 and P1236.

  14. 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 memory limit

    Tech Tips


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

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

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

WIRING DIAGRAM

B002DNGE01

CAUTION / NOTICE / HINT

Tech Tips


  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

  • If the current from the INJ1 relay is cut because DTC P062D is stored, DTC P1235 will be stored even if the fuel pump with seal sub-assembly (for high pressure side) is normal.

  • If the current from the INJ2 relay is cut because DTC P062E is stored, DTC P1236 will be stored even if the fuel pump with seal sub-assembly (for high pressure side) 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. CHECK INJECTOR DRIVER (NO.1 AND NO.2)

    B002ETJC01
    *1 No. 1 injector driver
    *2 No. 2 injector driver

    1. Turn the engine switch off.

    2. Interchange the No. 1 and No. 2 injector driver.

      Note

      Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver may be damaged.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

    6. Clear the DTCs.

      Note

      Before clearing the DTCs, write them down.


      Powertrain > Engine > Clear DTCs

    7. Start the engine.

    8. Enter the following menus: Powertrain / Engine / Trouble Codes.


      Powertrain > Engine > Trouble Codes

    9. Read the DTCs.

      Result
      Result Proceed to
      DTCs do not change A
      DTCs change (change in malfunctioning cylinder or EDU code) B

    B

    REPLACE INJECTOR DRIVER (NO.1 or NO. 2) Click here

    A

  2. INSPECT FUEL PUMP WITH SEAL SUB-ASSEMBLY (FOR HIGH PRESSURE SIDE)


    1. Inspect the fuel pump with seal sub-assembly (for high pressure side).

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL PUMP WITH SEAL SUB-ASSEMBLY (FOR HIGH PRESSURE SIDE) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - FUEL PUMP WITH SEAL SUB-ASSEMBLY (FOR HIGH PRESSURE SIDE))


    1. Disconnect the E14 or E41 injector driver connector.

    2. Disconnect the E19 or E32 fuel pump with seal sub-assembly (for high pressure side) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E14-3 (FP+) - E19-1 (FP1+) Always Below 1 Ω
      E14-4 (FP-) - E19-2 (FP1-) Always Below 1 Ω
      E41-3 (FP2+) - E32-1 (FP2+) Always Below 1 Ω
      E41-4 (FP2-) - E32-2 (FP2-) Always Below 1 Ω
      E14-3 (FP+) or E19-1 (FP1+) - Body ground and other terminals Always 10 kΩ or higher
      E14-4 (FP-) or E19-2 (FP1-) - Body ground and other terminals Always 10 kΩ or higher
      E41-3 (FP2+) or E32-1 (FP2+) - Body ground and other terminals Always 10 kΩ or higher
      E41-4 (FP2-) or E32-2 (FP2-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the E4 ECM connector.

    2. Disconnect the E13 or E40 injector driver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E4-10 (FPF1) - E13-7 (FPF1) Always Below 1 Ω
      E4-11 (FPD) - E13-8 (FPD) Always Below 1 Ω
      E4-12 (FPF2) - E40-7 (FPF2) Always Below 1 Ω
      E4-13 (FPD2) - E40-8 (FPD2) Always Below 1 Ω
      E4-10 (FPF1) or E13-7 (FPF1) - Body ground and other terminals Always 10 kΩ or higher
      E4-11 (FPD) or E13-8 (FPD) - Body ground and other terminals Always 10 kΩ or higher
      E4-12 (FPF2) or E40-7 (FPF2) - Body ground and other terminals Always 10 kΩ or higher
      E4-13 (FPD2) or E40-8 (FPD2) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR