SFI SYSTEM, Diagnostic DTC:P1276, P1277, P1278, P1279, P127A, P127B

DTC Code DTC Name
P1276 Port Injector Circuit No. 1
P1277 Port Injector Circuit No. 2
P1278 Port Injector Circuit No. 3
P1279 Port Injector Circuit No. 4
P127A Port Injector Circuit No. 5
P127B Port Injector Circuit No. 6

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 the intake port injection systems in accordance with the engine speed and load.

DTC No. DTC Detection Condition Trouble Area

P1276

P1277

P1278

P1279

P127A

P127B

 Current is not applied to the injector 10 times or more with the engine running.

  • Open or short in injector for port injection circuit

  • INJ fuse

  • Injector for port injection

  • ECM

MONITOR DESCRIPTION

The ECM monitors the injection control of the port injector. If a malfunction is detected in the port injector circuit, the ECM cancels the injection control for the corresponding cylinder and turns on the MIL.

MONITOR STRATEGY

Required sensors/Components Port injector (cylinder 1 to 6)
Frequency of operation Continuous

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) Click here.

  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 and ECT / Trouble Codes.

  9. Read the DTCs [B].

    Tech Tips


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

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

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

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

  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'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

A01FHJFE01

INSPECTION PROCEDURE

Tech Tips

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 ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1276, P1277, P1278, P1279, P127A OR P127B)


    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 and ECT / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      P1276, P1277, P1278, P1279, P127A or P127B is output A
      P1276, P1277, P1278, P1279, P127A and P127B are output B
      P1276, P1277, P1278, P1279, P127A or P127B and other DTCs are output C

      Tech Tips

      If any DTCs other than P1276, P1277, P1278, P1279, P127A or P127B are output, troubleshoot those DTCs first.


    B

    CHECK AND REPLACE INJ FUSE

    C

    GO TO DTC CHART Click here

    A

  2. CHECK ECM TERMINAL VOLTAGE (#10, #20, #30, #40, #50 OR #60 TERMINAL)


    1. A01FGY2E04
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      Inspect using an oscilloscope.

    2. While idling, check the waveform of the ECM connectors.

      Standard
      Tester Connection Specified Condition

      F3-17 (#10) - F2-2 (E01)

      F2-11 (#20) - F2-2 (E01)

      F3-16 (#30) - F2-2 (E01)

      F2-10 (#40) - F2-2 (E01)

      F3-15 (#50) - F2-2 (E01)

      F2-9 (#60) - F2-2 (E01)

      		 Correct waveform appears as shown

    NG

    CHECK FUEL INJECTOR FOR PORT INJECTION (POWER SOURCE VOLTAGE) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  3. CHECK FUEL INJECTOR FOR PORT INJECTION (POWER SOURCE VOLTAGE)


    1. A01FHFQE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector for Port Injection)

      Disconnect the fuel injector 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
      F26-1 - Body ground Engine switch on (IG) 11 to 14 V
      M1-1 - Body ground Engine switch on (IG) 11 to 14 V
      F27-1 - Body ground Engine switch on (IG) 11 to 14 V
      M2-1 - Body ground Engine switch on (IG) 11 to 14 V
      F28-1 - Body ground Engine switch on (IG) 11 to 14 V
      M3-1 - Body ground Engine switch on (IG) 11 to 14 V

    4. Reconnect the fuel injector for port injection connector.


    NG

    CHECK AND REPAIR HARNESS OR CONNECTOR (IG2 RELAY - INJECTOR FOR PORT INJECTION)

    OK

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


    1. Disconnect the ECM connector.

    2. Disconnect the injector connector.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F26-2 - F3-17 (#10) Always Below 1 Ω
      M1-2 - F2-11 (#20) Always Below 1 Ω
      F27-2 - F3-16 (#30) Always Below 1 Ω
      M2-2 - F2-10 (#40) Always Below 1 Ω
      F28-2 - F3-15 (#50) Always Below 1 Ω
      M3-2 - F2-9 (#60) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F26-2 or F3-17 (#10) - Body ground Always 10 kΩ or higher
      M1-2 or F2-11 (#20) - Body ground Always 10 kΩ or higher
      F27-2 or F3-16 (#30) - Body ground Always 10 kΩ or higher
      M2-2 or F2-10 (#40) - Body ground Always 10 kΩ or higher
      F28-2 or F3-15 (#50) - Body ground Always 10 kΩ or higher
      M3-2 or F2-9 (#60) - Body ground Always 10 kΩ or higher

    4. Reconnect the injector connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - FUEL INJECTOR FOR PORT INJECTION)

    OK

  5. CHECK FUEL INJECTOR FOR PORT INJECTION (RESISTANCE)


    1. Check the fuel injector for port injection resistance Click here.

      Tech Tips

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


    NG

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

    OK

    REPLACE ECM Click here