ECD SYSTEM, Diagnostic DTC:P1626 and 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 (EDU) from terminal IDLO of the ECM.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P1626

Idle Signal Output Value Too Low

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

Comes on

DTC stored

P1627

Idle Signal Output Value Too High

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

Comes on

DTC stored

CONFIRMATION DRIVING PATTERN

DTC No.

DTC Detection Drive Pattern

P1626

Warm up the engine and idle it for 5 seconds

P1627

WIRING DIAGRAM

A205143E16

CAUTION / NOTICE / HINT

Note:

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

Tip:

Read freeze frame data using the GTS. 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 (EDU) - ECM)

    1. Disconnect the injector driver (EDU) 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

      B53-2 (IJEN) - B76-62 (ILDO)

      Always

      Below 1 Ω

      B53-2 (IJEN) or B76-62 (ILDO) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  2. REPLACE INJECTOR DRIVER (EDU)

    1. Replace the injector driver (EDU).

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  3. CHECK ANY OTHER DTCS OUTPUT

    1. Connect the GTS to the DLC3.

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

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

    4. Read the DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Result

      Proceed to

      DTC is not output

      A

      DTC P1626 or P1627 is output

      B
    A

    END

    B

  4. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    Result

    Proceed to

    NEXT
    NEXT

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

    6. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    7. Confirm that the DTC is not output.

      Powertrain > Engine > Trouble Codes

    Result

    Proceed to

    NEXT
    NEXT

    END