ECD SYSTEM (w/ DPF), Diagnostic DTC:P1626, P1627

DTC Code DTC Name
P1626 Idle Signal Output Value Too Low
P1627 Idle Signal Output Value Too High

DESCRIPTION

The ECM reduces injector operation speed and applied voltage to the injector to reduce the sound it produces during idling. To do this, the ECM outputs applied voltage switching signals to terminal IJEN of the injector driver from terminal IDLO of the ECM.

P1626
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Warm up the engine and idle it for 5 seconds With the engine running at idle, voltage of the ECM IDLO terminal is 0.05 V or less for 5 seconds or more (1 trip detection logic).

  • Open or short in idle control circuit

  • Injector driver (EDU)

  • ECM
P1627
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Warm up the engine and idle it for 5 seconds With the engine running at speeds higher than idle, voltage of the ECM IDLO terminal is 3.4 V or higher for 5 seconds or more (1 trip detection logic).

  • Open or short in idle control circuit

  • Injector driver (EDU)

  • ECM

WIRING DIAGRAM

A01KIIGE02

INSPECTION PROCEDURE

Note


  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.

  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

  • After replacing the fuel supply pump assembly or suction control valve, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

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, and other data from the time the malfunction occurred.

PROCEDURE


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


    1. Disconnect the injector driver connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E20-2 (IJEN) - E11-19 (IDLO) Always Below 1 Ω
      E20-2 (IJEN) or E11-19 (IDLO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. REPLACE INJECTOR DRIVER (EDU)


    1. Replace the injector driver Click here.


    NEXT

  3. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Read the DTCs.

      Result
      Result Proceed to
      No DTC is output A
      P1626 or P1627 is output B

    B

    REPLACE ECM Click here

    A

    END

  4. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Clear the DTCs Click here.

    4. After warming up the engine, idle the engine for 5 seconds or more.

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

    6. Confirm that the DTC is not output again.


    NEXT

    END