SFI SYSTEM, 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 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 intake side camshaft (bank) 1 and bank 2.

The fuel pump for high pressure increases the pressure of the fuel supplied from the fuel pump in the fuel tank to 4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1885 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 fuel pump for high pressure (bank 1) circuit for 1 second or more

(1 trip detection logic)

  • Open in fuel pump for high pressure (bank 1) circuit

  • Fuel pump for high pressure

  • Injector driver (No. 1)

  • ECM
P1236

Open or short in fuel pump for high pressure (bank 2) circuit for 1 second or more

(1 trip detection logic)

  • Open in fuel pump for high pressure (bank 2) circuit

  • Fuel pump for high pressure

  • Injector driver (No. 2)

  • ECM

WIRING DIAGRAM

A001B4YE02

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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 DTC


    1. A00198FE05
      *1 Injector Driver (No. 2)
      *2 Injector Driver (No. 1)

      Interchange the injector drivers No. 1 and No. 2 Click here.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG) and turn the tester ON.

    4. Clear DTCs Click here.

      Note

      Before deleting the DTCs, write them down.

    5. Start the engine.

    6. Enter the following menus: Powertrain / Engine / DTC.

    7. Read the DTC.

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

    B

    REPLACE INJECTOR DRIVER Click here

    A

  2. INSPECT SPILL CONTROL VALVE


    1. A001AUZE01
      *1 Component without harness connected: (Spill Control Valve)

      Disconnect the E43 or E35 spill control valve connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 1.19 to 1.39 Ω

    NG

    REPLACE FUEL PUMP FOR HIGH PRESSURE Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - SPILL CONTROL VALVE)


    1. Disconnect the E16 or E28 injector driver (EDU) connector.

      A001E7ZE02

    2. Disconnect the E43 or E35 spill control valve connector.

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

      Standard resistance (Check for open)
      No. 1
      Tester Connection Condition Specified Condition
      E16-1 (FP+) - E43-1 Always Below 54 mΩ
      E16-4 (FP-) - E43-2 Always Below 54 mΩ
      No. 2
      Tester Connection Condition Specified Condition
      E28-1 (FP2+) - E35-1 Always Below 54 mΩ
      E28-4 (FP2-) - E35-2 Always Below 54 mΩ
      Standard resistance (Check for short)
      No. 1
      Tester Connection Condition Specified Condition
      E16-1 (FP+) or E43-1 - Engine ground Always 1 MΩ or more
      E16-4 (FP-) or E43-2 - Engine ground Always 1 MΩ or more
      No. 2
      Tester Connection Condition Specified Condition
      E28-1 (FP2+) or E35-1 - Engine ground Always 1 MΩ or more
      E28-4 (FP2-) or E35-2 - Engine ground Always 1 MΩ or more

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the E15 injector driver (No. 1) connector.

      A001F14E02

    2. Disconnect the E27 injector driver (No. 2) connector.

    3. Disconnect the E4 ECM connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      E15-8 (FPD) - E4-11 (FPD) Always Below 1 Ω
      E15-7 (FPF) - E4-10 (FPF1) Always Below 1 Ω
      E27-8 (FPD2) - E4-13 (FPD2) Always Below 1 Ω
      E27-7 (FPF2) - E4-12 (FPF2) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      E15-8 (FPD) or E4-11 (FPD) - Body ground Always 10 kΩ or higher
      E15-7 (FPF) or E4-10 (FPF1) - Body ground Always 10 kΩ or higher
      E27-8 (FPD2) or E4-13 (FPD2) - Body ground Always 10 kΩ or higher
      E27-7 (FPF2) or E4-12 (FPF2) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR