SFI SYSTEM, Diagnostic DTC:P1276, P1277, P1278, P1279, P127A, P127B, P127C, P127D

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
P127C Port Injector Circuit #7
P127D Port Injector Circuit #8

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

P127C

P127D

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

  • Open or short in injector for port injection circuit

  • 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.

WIRING DIAGRAM

A0019IKE14
A0019OWE10

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 ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1276, P1277, P1278, P1279, P127A, P127B, P127C OR P127D)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Start the engine.

    4. Turn the tester ON.

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

    6. Read DTCs.

      Result
      Display (DTC output) Proceed to
      P1276, P1277, P1278, P127A, P127B, P127C or P127D A
      P1276, P1277, P1278, P127A or P127B and other DTCs B

    B

    GO TO DTC CHART Click here

    A

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


    1. A001DXVE02
      *1 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 Switch Condition Specified Condition
      J5-2 - Body ground Engine switch on (IG) 11 to 14 V
      I5-2 - Body ground Engine switch on (IG) 11 to 14 V
      J6-2 - Body ground Engine switch on (IG) 11 to 14 V
      I6-2 - Body ground Engine switch on (IG) 11 to 14 V
      J7-2 - Body ground Engine switch on (IG) 11 to 14 V
      I7-2 - Body ground Engine switch on (IG) 11 to 14 V
      J8-2 - Body ground Engine switch on (IG) 11 to 14 V
      I8-2 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    CHECK AND REPAIR HARNESS OR CONNECTOR (INJ FUSE - INJECTOR FOR PORT INJECTION)

    OK

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


    1. Disconnect the E2 and E4 ECM connectors.

      A001F7AE02
      *1 Front view of wire harness connector: (to Fuel Injector for Port Injection)
      *2 ECM Connector

    2. Disconnect the fuel injector for port injection connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      J5-1 - E4-17 (#10) Always Below 1 Ω
      I5-1 - E2-11 (#20) Always Below 1 Ω
      J6-1 - E4-16 (#30) Always Below 1 Ω
      I6-1 - E2-10 (#40) Always Below 1 Ω
      J7-1 - E4-15 (#50) Always Below 1 Ω
      I7-1 - E2-9 (#60) Always Below 1 Ω
      J8-1 - E4-14 (#70) Always Below 1 Ω
      I8-1 - E2-8 (#80) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      J5-1 or E4-17 (#10) - Body ground Always 10 kΩ or higher
      I5-1 or E2-11 (#20) - Body ground Always 10 kΩ or higher
      J6-1 or E4-16 (#30) - Body ground Always 10 kΩ or higher
      I6-1 or E2-10 (#40) - Body ground Always 10 kΩ or higher
      J7-1 or E4-15 (#50) - Body ground Always 10 kΩ or higher
      I7-1 or E2-9 (#60) - Body ground Always 10 kΩ or higher
      J8-1 or E4-14 (#70) - Body ground Always 10 kΩ or higher
      I8-1 or E2-8 (#80) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK FUEL INJECTOR FOR PORT INJECTION (RESISTANCE)


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


    OK

    REPLACE ECM Click here

    NG

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here