ECD SYSTEM, 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 starting engine coolant temperature when the ignition switch is turned to ON. The ECM then turns on the glow plug relay 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 circuit.

(2 trip detection logic)

  • Open or short in glow plug relay circuit

  • Glow plug relay

  • 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

A005HGME03

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

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 sensor as shown in the illustration.

      A005IGHE07

      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. A005GZ1E06
      Text in Illustration
      *a

      Component without harness connected

      (Glow Plug Relay)

      Disconnect the glow plug relay 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 and 2 Below 1 Ω

    3. Reconnect the glow plug relay connector.


    NG

    REPLACE GLOW PLUG RELAY ASSEMBLY Click here

    OK

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


    1. Disconnect the glow plug relay connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B76-2 - B21-13 (GREL) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B76-2 or B21-13 (GREL) - Body ground Always 10 kΩ or higher

    4. Reconnect the glow plug relay connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

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


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

    2. Disconnect the glow plug relay connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B76-1 - 1E-3 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B76-1 or 1E-3 - Body ground Always 10 kΩ or higher

    4. Reconnect the glow plug relay connector.

    5. Reinstall the No. 1 integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

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


    1. Disconnect the battery positive terminal.

    2. Disconnect the glow plug relay connector.

    3. Disconnect the glow plug wire.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B76-3 - B75-1 Always Below 1 Ω
      B76-4 - Battery positive terminal Always Below 1 Ω

    5. Reconnect the battery positive terminal.

    6. Reconnect the glow plug wire.

    7. Reconnect the glow plug relay connector.


    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. Clear the DTCs Click here.

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON.

    5. Confirm that the DTC is not output again.


    NEXT

    END