ECD SYSTEM(w/ DPF), 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 assembly, depending on the starting 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.

P0380
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 1 second

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
Related Data List
DTC No. Data List
P0380

  • Pre Glow

  • After Glow

Tech Tips


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


    • Difficult starting

WIRING DIAGRAM

A01VJASE02

CAUTION / NOTICE / HINT

Note


  • When replacing the ECM, the ECM needs Registration and Initialization Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection 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 here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.

  • 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. READ VALUE USING INTELLIGENT TESTER (PRE GLOW AND AFTER GLOW)


    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 / Data List / Pre Glow and 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.

      Tech Tips

      "Pre Glow" and "After Glow" times vary depending on the engine coolant temperature as shown in the illustration.

      A01VGY3E08

      Tech Tips


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

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


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT GLOW PLUG RELAY ASSEMBLY


    1. A01VIOSE06
      Text in Illustration
      *a

      Component without harness connected

      (Glow Plug Relay Assembly)

      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

    NG

    REPLACE GLOW PLUG RELAY ASSEMBLY Click 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
      B76-2 - B21-13 (GREL) Always Below 1 Ω
      B76-2 or B21-13 (GREL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (GLOW PLUG RELAY ASSEMBLY - NO. 1 INTEGRATION RELAY)


    1. Remove the No. 1 integration relay from the engine room relay block.

    2. Disconnect the glow plug relay assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B76-1 - 1E-3 Always Below 1 Ω
      B76-1 or 1E-3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

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


    1. Disconnect the battery positive terminal.

    2. Disconnect the glow plug relay assembly connector.

    3. Disconnect the glow plug wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B76-3 - B75-1 Always Below 1 Ω
      B76-4 - Battery positive terminal Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  7. REPLACE GLOW PLUG RELAY ASSEMBLY


    1. Replace the glow plug relay assembly.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

  9. 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. Turn the ignition switch off.

    5. Turn the ignition switch to ON.

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

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


    NEXT

    END