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SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P1276, P1277, P1278, P1279, P127A, P127B, P127C, P127D

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DTC Code DTC Name
P1276 Port Injector Circuit #1
P1277 Port Injector Circuit #2
P1278 Port Injector Circuit #3
P1279 Port Injector Circuit #4
P127A Port Injector Circuit #5
P127B Port Injector Circuit #6
P127C Port Injector Circuit #7
P127D Port Injector Circuit #8
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DESCRIPTION

The D-4S system has two injection systems. One is the in-cylinder direct injection system that directly injects pressurized fuel into the combustion chamber. The other is the intake port injection system. The ECM determines the percentage of in-cylinder direct injection to intake port injection in accordance with the engine speed and load.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P1276 Port Injector Circuit #1 Current is not applied to the injector 10 times or more with the engine running (1 trip detection logic).

  • Open or short in fuel injector assembly (for port injection) circuit

  • Fuel injector assembly (for port injection)

  • Semiconductor pwr integration ECU

  • ECM

 Comes on DTC stored
P1277 Port Injector Circuit #2 Current is not applied to the injector 10 times or more with the engine running (1 trip detection logic).

  • Open or short in fuel injector assembly (for port injection) circuit

  • Fuel injector assembly (for port injection)

  • Semiconductor pwr integration ECU

  • ECM

 Comes on DTC stored
P1278 Port Injector Circuit #3 Current is not applied to the injector 10 times or more with the engine running (1 trip detection logic).

  • Open or short in fuel injector assembly (for port injection) circuit

  • Fuel injector assembly (for port injection)

  • Semiconductor pwr integration ECU

  • ECM

 Comes on DTC stored
P1279 Port Injector Circuit #4 Current is not applied to the injector 10 times or more with the engine running (1 trip detection logic).

  • Open or short in fuel injector assembly (for port injection) circuit

  • Fuel injector assembly (for port injection)

  • Semiconductor pwr integration ECU

  • ECM

 Comes on DTC stored
P127A Port Injector Circuit #5 Current is not applied to the injector 10 times or more with the engine running (1 trip detection logic).

  • Open or short in fuel injector assembly (for port injection) circuit

  • Fuel injector assembly (for port injection)

  • Semiconductor pwr integration ECU

  • ECM

 Comes on DTC stored
P127B Port Injector Circuit #6 Current is not applied to the injector 10 times or more with the engine running (1 trip detection logic).

  • Open or short in fuel injector assembly (for port injection) circuit

  • Fuel injector assembly (for port injection)

  • Semiconductor pwr integration ECU

  • ECM

 Comes on DTC stored
P127C Port Injector Circuit #7 Current is not applied to the injector 10 times or more with the engine running (1 trip detection logic).

  • Open or short in fuel injector assembly (for port injection) circuit

  • Fuel injector assembly (for port injection)

  • Semiconductor pwr integration ECU

  • ECM

 Comes on DTC stored
P127D Port Injector Circuit #8 Current is not applied to the injector 10 times or more with the engine running (1 trip detection logic).

  • Open or short in fuel injector assembly (for port injection) circuit

  • Fuel injector assembly (for port injection)

  • Semiconductor pwr integration ECU

  • ECM

 Comes on DTC stored
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MONITOR DESCRIPTION

The ECM monitors the injection control of the fuel injector assembly (for port injection). If a malfunction is detected in the fuel injector assembly (for port injection) circuit, the ECM cancels the injection control for the corresponding cylinder and illuminates the MIL.

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MONITOR STRATEGY

Required Sensors/Components Port injector (cylinder 1 to 8)
Frequency of Operation Continuous
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CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

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

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

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

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

  6. Start the engine.

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

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

  9. Read the DTCs [B].

    Tip:

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

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

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

  11. Input the DTC: P1276, P1277, P1278, P1279, P127A, P127B, P127C or P127D.

  12. 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
    Tip:

    • 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.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following procedure.

Tip:

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.

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PROCEDURE


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    READ OUTPUT DTCS (DTC P1276, P1277, P1278, P1279, P127A, P127B, P127C OR P127D)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      P1276, P1277, P1278, P1279, P127A, P127B, P127C or P127D is output A
      P1276, P1277, P1278, P1279, P127A, P127B, P127C and P127D are output B

  2. *a Front view of wire harness connector (to Fuel Injector Assembly (for Port Injection))
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    CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION))


    1. Disconnect the fuel injector assembly (for port injection) connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L1-2 - Body ground Engine switch on (IG) 11 to 14 V
      K1-2 - Body ground Engine switch on (IG) 11 to 14 V
      L2-2 - Body ground Engine switch on (IG) 11 to 14 V
      K2-2 - Body ground Engine switch on (IG) 11 to 14 V
      L4-2 - Body ground Engine switch on (IG) 11 to 14 V
      K3-2 - Body ground Engine switch on (IG) 11 to 14 V
      L5-2 - Body ground Engine switch on (IG) 11 to 14 V
      K4-2 - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

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    CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) - ECM)


    1. Disconnect the ECM connector.

    2. Disconnect the fuel injector assembly (for port injection) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L1-1 - F7-17 (#10) Always Below 1 Ω
      K1-1 - F2-11 (#20) Always Below 1 Ω
      L2-1 - F7-16 (#30) Always Below 1 Ω
      K2-1 - F2-10 (#40) Always Below 1 Ω
      L4-1 - F7-15 (#50) Always Below 1 Ω
      K3-1 - F2-9 (#60) Always Below 1 Ω
      L5-1 - F7-14 (#70) Always Below 1 Ω
      K4-1 - F2-8 (#80) Always Below 1 Ω
      L1-1 or F7-17 (#10) - Body ground Always 10 kΩ or higher
      K1-1 or F2-11 (#20) - Body ground Always 10 kΩ or higher
      L2-1 or F7-16 (#30) - Body ground Always 10 kΩ or higher
      K2-1 or F2-10 (#40) - Body ground Always 10 kΩ or higher
      L4-1 or F7-15 (#50) - Body ground Always 10 kΩ or higher
      K3-1 or F2-9 (#60) - Body ground Always 10 kΩ or higher
      L5-1 or F7-14 (#70) - Body ground Always 10 kΩ or higher
      K4-1 or F2-8 (#80) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    INSPECT FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION (RESISTANCE))


    1. Inspect the fuel injector assembly (for port injection).

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      Tip:

      Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

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      Result
      Proceed to
      OK
      NG

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    CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) - SEMICONDUCTOR PWR INTEGRATION ECU)


    1. Disconnect the semiconductor pwr integration ECU connector.

    2. Disconnect the fuel injector assembly (for port injection) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L1-2 - 2G-3 Always Below 1 Ω
      K1-2 - 2G-3 Always Below 1 Ω
      L2-2 - 2G-3 Always Below 1 Ω
      K2-2 - 2G-3 Always Below 1 Ω
      L4-2 - 2G-3 Always Below 1 Ω
      K3-2 - 2G-3 Always Below 1 Ω
      L5-2 - 2G-3 Always Below 1 Ω
      K4-2 - 2G-3 Always Below 1 Ω
      L1-2 or 2G-3 - Body ground Always 10 kΩ or higher
      K1-2 or 2G-3 - Body ground Always 10 kΩ or higher
      L2-2 or 2G-3 - Body ground Always 10 kΩ or higher
      K2-2 or 2G-3 - Body ground Always 10 kΩ or higher
      L4-2 or 2G-3 - Body ground Always 10 kΩ or higher
      K3-2 or 2G-3 - Body ground Always 10 kΩ or higher
      L5-2 or 2G-3 - Body ground Always 10 kΩ or higher
      K4-2 or 2G-3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE SEMICONDUCTOR POWER INTEGRATION ECUClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR