ECD SYSTEM(w/o Glow Plug Controller), Diagnostic DTC:P0380

DTC Code DTC Name
P0380 Glow Plug / Heater Circuit "A" Malfunction

DESCRIPTION

The glow plug is mounted inside the engine combustion chamber. To ensure efficient engine starting with a cold engine, the ECM calculates the time interval the current needs to flow through the glow plug, depending on the engine coolant temperature when the ignition switch is turned to ON. The ECM then turns on the glow plug relay assembly and permits the current to flow through the glow plug based on the calculated time of the ECM. The glow plug is then heated, and enhances fuel combustion with a cold engine.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0380

Glow Plug / Heater Circuit "A" Malfunction

Open or short in glow plug relay assembly circuit.

(2 trip detection logic)

  • Open or short in glow plug relay assembly circuit

  • Glow plug relay assembly

  • ECM

Comes on

DTC stored
Table 1. DTC Detection Drive Pattern

DTC No.

DTC Detection Drive Pattern

P0380

Ignition switch ON for 1 second
Table 2. Related Data List

DTC No.

Data List

P0380

  • Pre Glow

  • After Glow
Tip:

  • If DTC P0380 is stored, the following symptoms may appear:

    • Difficult starting

WIRING DIAGRAM

A293496E01

CAUTION / NOTICE / HINT

Note:

  • When replacing the ECM, perform ECM Initialization and Registration.

    Click hereClick here

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

  • After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click hereClick hereClick hereClick here

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • 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. READ VALUE USING GTS (PRE GLOW AND AFTER GLOW)

    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 / Data List / Pre Glow and After Glow.

      Powertrain > Engine and ECT > Data List

      Tester Display

      Pre Glow

      After Glow

    4. Read the values when before and after start the engine.

      OK

      "Pre Glow" is ON before starting the engine and "After Glow" is ON after starting the engine.

      Tip:

      • "Pre Glow" and "After Glow" times vary depending on the engine coolant temperature sensor.

        Click here

      • Pre-glow time depends on battery voltage and engine coolant temperature.

      • After-glow time depends on atmospheric pressure and engine coolant temperature.

    Result

    Proceed to

    OK

    NG
    OK

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    NG

  2. INSPECT GLOW PLUG RELAY ASSEMBLY

    A199031C03

    *a

    Component without harness connected

    (Glow Plug Relay Assembly)

    1. Disconnect the glow plug relay assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 - 4

      Battery voltage not applied

      10 kΩ or higher

      Battery voltage applied to terminals 1 - 2

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE GLOW PLUG RELAY ASSEMBLYClick here

    OK

  3. CHECK HARNESS AND CONNECTOR (GLOW PLUG RELAY ASSEMBLY - ECM)

    1. Disconnect the glow plug relay assembly 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

      A100-2 - B138-13 (GREL)

      Always

      Below 1 Ω

      A100-2 or B138-13 (GREL) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  4. CHECK HARNESS AND CONNECTOR (GLOW PLUG RELAY ASSEMBLY - EFI-MAIN RELAY)

    1. Disconnect the glow plug relay assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A100-1 - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  5. CHECK HARNESS AND CONNECTOR (GLOW PLUG RELAY ASSEMBLY - GLOW PLUG ASSEMBLY - BATTERY)

    1. Disconnect the negative (-) battery terminal.

    2. Disconnect the positive (+) battery terminal.

    3. Disconnect the glow plug relay assembly connector.

    4. Disconnect the glow plug wire.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A100-3 - B128-1

      Always

      Below 1 Ω

      A100-4 - Battery positive terminal

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  6. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off.

    5. Turn the ignition switch to ON.

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

    7. Confirm that the pending DTC is not output again.

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Proceed to

    NEXT
    NEXT

    END

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  9. REPLACE GLOW PLUG RELAY ASSEMBLY

    1. Replace the glow plug relay assembly.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here