ECD SYSTEM (w/ DPF), Diagnostic DTC:P064C, P066B, P066D, P066F, P0671, P0672, P0673, P0674, P067B, P166F

DTC Code DTC Name
P064C Glow Plug Control Module
P066B Cylinder 1 Glow Plug Control Circuit High
P066D Cylinder 2 Glow Plug Control Circuit High
P066F Cylinder 3 Glow Plug Control Circuit High
P0671 Cylinder 1 Glow Plug Circuit/Open
P0672 Cylinder 2 Glow Plug Circuit/Open
P0673 Cylinder 3 Glow Plug Circuit/Open
P0674 Cylinder 4 Glow Plug Circuit/Open
P067B Cylinder 4 Glow Plug Control Circuit High
P166F Glow Plug Control Module Circuit Short

DESCRIPTION

P064C
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode The MOS inside the glow plug control unit is detected as being stuck on 3 times while the glow plugs are on (2 trip detection logic). Glow plug controller
P066B
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode A short circuit in the No. 1 glow plug circuit is detected 3 times while the glow plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 1 glow plug

  • Short in No. 1 glow plug circuit
P066D
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode A short circuit in the No. 2 glow plug circuit is detected 3 times while the glow plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 2 glow plug

  • Short in No. 2 glow plug circuit
P066F
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode A short circuit in the No. 3 glow plug circuit is detected 3 times while the glow plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 3 glow plug

  • Short in No. 3 glow plug circuit
P067B
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode A short circuit in the No. 4 glow plug circuit is detected 3 times while the glow plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 4 glow plug

  • Short in No. 4 glow plug circuit
P0671
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode An open circuit in the No. 1 glow plug circuit is detected 3 times while the glow plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 1 glow plug

  • Open in No. 1 glow plug circuit
P0672
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode An open circuit in the No. 2 glow plug circuit is detected 3 times while the glow plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 2 glow plug

  • Open in No. 2 glow plug circuit
P0673
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode An open circuit in the No. 3 glow plug circuit is detected 3 times while the glow plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 3 glow plug

  • Open in No. 3 glow plug circuit
P0674
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode An open circuit in the No. 4 glow plug circuit is detected 3 times while the glow plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 4 glow plug

  • Open in No. 4 glow plug circuit
P166F
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Enter check mode A short circuit in a wire harness between the glow plugs is detected 3 times while the glow plugs are on (2 trip detection logic).

  • Glow plug controller

  • Open or short in glow plug circuit

WIRING DIAGRAM

Refer to DTC P052F Click here

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, 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 DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

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

    4. Read the DTCs.

      Result
      Result Proceed to
      P0671, P0672, P0673 and/or P0674 is output A
      P066B, P066D, P066F and/or P067B is output B
      P064C and/or P166F is output C

    B

    CHECK HARNESS AND CONNECTOR Click here

    C

    CHECK HARNESS AND CONNECTOR Click here

    A

  2. CHECK GLOW PLUG CONTROLLER


    1. A00K29YE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Glow Plug Controller)

      Disconnect the glow plug controller connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A80-1(BATT) - Body ground Always 11 to 14 V

    3. Reconnect the glow plug controller connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR


    1. A00K236E01
      Text in Illustration
      *1 No. 1 Glow Plug Connector
      *a

      Front view of wire harness connector

      (to Glow Plug Controller)
      *b

      Front view of wire harness connector

      (to Glow Plug Controller)

      Disconnect connectors of the glow plug controller.

    2. Remove the No. 1 glow plug connector from the glow plug.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A82-1 (GL1) - No. 1 glow plug connector terminal 1 Always Below 1 Ω
      A82-2 (GL2) - No. 1 glow plug connector terminal 2 Always Below 1 Ω
      A81-1 (GL3) - No. 1 glow plug connector terminal 3 Always Below 1 Ω
      A81-2 (GL4) - No. 1 glow plug connector terminal 4 Always Below 1 Ω

    4. Reconnect the glow plug controller connector.

    5. Reinstall the No. 1 glow plug connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. INSPECT GLOW PLUG


    1. Clear the DTCs Click here.

    2. Exchange the glow plugs of the malfunctioning cylinders (the cylinders indicated by output DTCs) with the glow plugs of normally functioning cylinders.

    3. Turn the engine switch on (IG).

    4. Turn the tester on.

    5. Using the intelligent tester, switch the ECM from normal mode to check mode Click here.

    6. Read the DTCs.

      Result
      Result Proceed to
      Same DTCs (that have been erased) A
      Other DTCs B

      Tech Tips

      Check for DTCs in check mode.


    A

    REPLACE GLOW PLUG CONTROLLER Click here

    B

  5. REPLACE GLOW PLUG


    1. Replace the glow plug Click here


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off for 30 seconds or more.

    4. Turn the engine switch on (IG).

    5. Turn the tester on.

    6. Using the intelligent tester, switch the ECM from normal mode to check mode Click here.

    7. Confirm that the DTC is not output again.

      Tech Tips

      Check for DTCs in check mode.


    NEXT

    END

  8. CHECK HARNESS AND CONNECTOR


    1. A00K236E01
      Text in Illustration
      *1 No. 1 Glow Plug Connector
      *a

      Front view of wire harness connector

      (to Glow Plug Controller)
      *b

      Front view of wire harness connector

      (to Glow Plug Controller)

      Disconnect connectors of the glow plug controller.

    2. Remove the No. 1 glow plug connector from the glow plug.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A82-1 (GL1) or No. 1 glow plug connector terminal 1 - Body ground Always 10 kΩ or higher
      A82-2 (GL2) or No. 1 glow plug connector terminal 2 - Body ground Always 10 kΩ or higher
      A81-1 (GL3) or No. 1 glow plug connector terminal 3 - Body ground Always 10 kΩ or higher
      A81-2 (GL4) or No. 1 glow plug connector terminal 4 - Body ground Always 10 kΩ or higher

      Tech Tips

      Make sure that there are no short circuits to the battery.

    4. Reconnect the glow plug controller connector.

    5. Reinstall the No. 1 glow plug connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  9. REPLACE GLOW PLUG CONTROLLER


    1. Replace the glow plug controller Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  10. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off for 30 seconds or more.

    4. Turn the engine switch on (IG).

    5. Turn the tester on.

    6. Using the intelligent tester, switch the ECM from normal mode to check mode Click here.

    7. Confirm that the DTC is not output again.

      OK
      No DTC is output.

      Tech Tips

      Check for DTCs in check mode.


    NG

    REPLACE GLOW PLUG Click here

    OK

    END

  12. REPLACE GLOW PLUG


    1. Replace the glow plug Click here


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  13. CHECK HARNESS AND CONNECTOR


    1. A00K236E01
      Text in Illustration
      *1 No. 1 Glow Plug Connector
      *a

      Front view of wire harness connector

      (to Glow Plug Controller)
      *b

      Front view of wire harness connector

      (to Glow Plug Controller)

      Disconnect connectors of the glow plug controller.

    2. Remove the No. 1 glow plug connector from the glow plug.

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

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A82-1 (GL1) or No. 1 glow plug connector terminal 1 - Body ground Always 10 kΩ or higher
      A82-2 (GL2) or No. 1 glow plug connector terminal 2 - Body ground Always 10 kΩ or higher
      A81-1 (GL3) or No. 1 glow plug connector terminal 3 - Body ground Always 10 kΩ or higher
      A81-2 (GL4) or No. 1 glow plug connector terminal 4 - Body ground Always 10 kΩ or higher

      Tech Tips

      Make sure that there are no short circuits to the battery.

    4. Reconnect the glow plug controller connector.

    5. Reinstall the No. 1 glow plug connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  14. REPLACE GLOW PLUG CONTROLLER


    1. Replace the glow plug controller Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  15. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  16. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off for 30 seconds or more.

    4. Turn the engine switch on (IG).

    5. Turn the tester on.

    6. Using the intelligent tester, switch the ECM from normal mode to check mode Click here.

    7. Confirm that the DTC is not output again.

      Tech Tips

      Check for DTCs in check mode.


    NEXT

    END