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
Ignition switch ON The MOS inside the glow plug controller is detected as being stuck on 3 times while the glow plug assemblies are on (2 trip detection logic). Glow plug controller
P066B
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON

(Engine temperature is 40°C (104°F) or less)

 A short circuit in the No. 1 glow plug circuit is detected 3 times while the glow plug assemblies are on (2 trip detection logic).

  • Glow plug controller

  • No. 1 glow plug assembly

  • Short in No. 1 glow plug circuit
P066D
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON

(Engine temperature is 40°C (104°F) or less)

 A short circuit in the No. 2 glow plug circuit is detected 3 times while the glow plug assemblies are on (2 trip detection logic).

  • Glow plug controller

  • No. 2 glow plug assembly

  • Short in No. 2 glow plug circuit
P066F
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON

(Engine temperature is 40°C (104°F) or less)

 A short circuit in the No. 3 glow plug circuit is detected 3 times while the glow plug assemblies are on (2 trip detection logic).

  • Glow plug controller

  • No. 3 glow plug assembly

  • Short in No. 3 glow plug circuit
P0671
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON

(Engine temperature is 40°C (104°F) or less)

 An open circuit in the No. 1 glow plug circuit is detected 3 times while the glow plug assemblies 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

Ignition switch ON

(Engine temperature is 40°C (104°F) or less)

 An open circuit in the No. 2 glow plug circuit is detected 3 times while the glow plug assemblies 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

Ignition switch ON

(Engine temperature is 40°C (104°F) or less)

 An open circuit in the No. 3 glow plug circuit is detected 3 times while the glow plug assemblies 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

Ignition switch ON

(Engine temperature is 40°C (104°F) or less)

 An open circuit in the No. 4 glow plug circuit is detected 3 times while the glow plug assemblies are on (2 trip detection logic).

  • Glow plug controller

  • No. 4 glow plug

  • Open in No. 4 glow plug circuit
P067B
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON

(Engine temperature is 40°C (104°F) or less)

 A short circuit in the No. 4 glow plug circuit is detected 3 times while the glow plug assemblies are on (2 trip detection logic).

  • Glow plug controller

  • No. 4 glow plug assembly

  • Short in No. 4 glow plug circuit
P166F
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON A short circuit in a wire harness between the glow plug assemblies is detected 3 times while the glow plug assemblies are on (2 trip detection logic).

  • Glow plug controller

  • Open or short in glow plug circuit

WIRING DIAGRAM

Refer to DTC P052F Click here

CAUTION / NOTICE / HINT

Note


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

  • Inspect the fuses of 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 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. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the DTCs.

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

    B

    CHECK HARNESS AND CONNECTOR (GLOW PLUG CONTROLLER - NO. 1 GLOW PLUG CONNECTOR) Click here

    C

    CHECK HARNESS AND CONNECTOR (GLOW PLUG CONTROLLER - NO. 1 GLOW PLUG CONNECTOR) Click here

    A

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF GLOW PLUG CONTROLLER)


    1. A00473GE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Glow Plug Controller)

      Disconnect the glow plug controller 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
      A103-1 (BATT) - Body ground Ignition switch ON 11 to 14 V

    NG

    INSPECT GLOW PLUG RELAY ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (GLOW PLUG CONTROLLER - NO. 1 GLOW PLUG CONNECTOR)


    1. A0048VYE02
      Text in Illustration
      *1 No. 1 Glow Plug Connector
      *a

      Front view of wire harness connector

      (to Glow Plug Controller)

      Disconnect the glow plug controller connector.

    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
      Tester Connection Condition Specified Condition
      A105-1 (GL1) - 1 (No. 1 glow plug connector terminal) Always Below 1 Ω
      A105-2 (GL2) - 2 (No. 1 glow plug connector terminal) Always Below 1 Ω
      A104-1 (GL3) - 3 (No. 1 glow plug connector terminal) Always Below 1 Ω
      A104-2 (GL4) - 4 (No. 1 glow plug connector terminal) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. INSPECT GLOW PLUG ASSEMBLY


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Exchange the glow plug assemblies of the malfunctioning cylinders (the cylinders indicated by output DTCs) with the glow plug assemblies of normally functioning cylinders.

    6. Turn the ignition switch to ON when the engine temperature is 40°C (104°F) or less.

    7. Turn the GTS on.

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

    9. Read the DTCs.

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

    A

    REPLACE GLOW PLUG CONTROLLER Click here

    B

  5. REPLACE GLOW PLUG ASSEMBLY


    1. Replace the glow plug assembly 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 GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off for 30 seconds or more.

    6. Turn the ignition switch to ON when the engine temperature is 40°C (104°F) or less.

    7. Turn the GTS on.

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

    9. Confirm that the DTC is not output again.


    NEXT

    END

  8. INSPECT GLOW PLUG RELAY ASSEMBLY


    1. Inspect the glow plug relay assembly Click here.


    NG

    REPLACE GLOW PLUG RELAY ASSEMBLY Click here

    OK

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


    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the cable from the positive (+) battery terminal.

    3. Remove the glow plug relay assembly.

    4. Remove the ECD NO. 2 relay from the No. 2 engine room relay block.

    5. Disconnect the A103 and A106 glow plug controller connectors.

    6. Disconnect the A108 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A107-4 (glow plug relay assembly holder) - Battery positive terminal Always Below 1 Ω
      A107-1 (glow plug relay assembly holder) - 3 (ECD No. 2 relay holder) Always Below 1 Ω
      A107-3 (glow plug relay assembly holder) - A103-1 (BATT) Always Below 1 Ω
      A107-2 (glow plug relay assembly holder) - A108-20 (GREL) Always Below 1 Ω
      A107-4 (glow plug relay assembly holder) or Battery positive terminal - Body ground Always 10 kΩ or higher
      A107-3 (glow plug relay assembly holder) or A103-1 (BATT) - Body ground Always 10 kΩ or higher
      A107-2 (glow plug relay assembly holder) or A108-20 (GREL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  10. CHECK TERMINAL VOLTAGE (POWER SOURCE OF GLOW PLUG RELAY ASSEMBLY)

    A004B60E02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Glow Plug Relay Assembly)

    1. Remove the glow plug relay assembly.

    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
      A107-1 (glow plug relay assembly holder) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  12. 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 Click here.

    5. Turn the ignition switch off and wait for at least 30 seconds.

    6. Turn the ignition switch to ON when the engine temperature is 40°C (104°F) or less.

    7. Turn the GTS on.

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

    9. Confirm that the DTC is not output.


    NEXT

    END

  13. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  14. 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 Click here.

    5. Turn the ignition switch off and wait for at least 30 seconds.

    6. Turn the ignition switch to ON when the engine temperature is 40°C (104°F) or less.

    7. Turn the GTS on.

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

    9. Confirm that the DTC is not output.


    NEXT

    END

  15. REPLACE GLOW PLUG RELAY ASSEMBLY


    1. Replace the glow plug relay assembly.


    NEXT

  16. 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 Click here.

    5. Turn the ignition switch off and wait for at least 30 seconds.

    6. Turn the ignition switch to ON when the engine temperature is 40°C (104°F) or less.

    7. Turn the GTS on.

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

    9. Confirm that the DTC is not output.


    NEXT

    END

  17. CHECK HARNESS AND CONNECTOR (GLOW PLUG CONTROLLER - NO. 1 GLOW PLUG CONNECTOR)


    1. A0048VYE02
      Text in Illustration
      *1 No. 1 Glow Plug Connector
      *a

      Front view of wire harness connector

      (to Glow Plug Controller)

      Disconnect the glow plug controller connector.

    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
      Tester Connection Condition Specified Condition
      A105-1 (GL1) or 1 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A105-2 (GL2) or 2 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A104-1 (GL3) or 3 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A104-2 (GL4) or 4 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher

      Tech Tips

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


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  18. REPLACE GLOW PLUG CONTROLLER


    1. Replace the glow plug controller Click here.


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P066B, P066D, P066F AND/OR P067B) Click here

  19. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  20. CHECK WHETHER DTC OUTPUT RECURS (DTC P066B, P066D, P066F AND/OR P067B)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off for 30 seconds or more.

    6. Turn the ignition switch to ON when the engine temperature is 40°C (104°F) or less.

    7. Turn the GTS on.

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

    9. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P066B, P066D, P066F and/or P067B is output B

    A

    END

    B

  21. REPLACE GLOW PLUG ASSEMBLY


    1. Replace the glow plug assembly Click here.


    NEXT

  22. CHECK HARNESS AND CONNECTOR (GLOW PLUG CONTROLLER - NO. 1 GLOW PLUG CONNECTOR)


    1. A0048VYE02
      Text in Illustration
      *1 No. 1 Glow Plug Connector
      *a

      Front view of wire harness connector

      (to Glow Plug Controller)

      Disconnect the glow plug controller connector.

    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
      Tester Connection Condition Specified Condition
      A105-1 (GL1) or 1 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A105-2 (GL2) or 2 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A104-1 (GL3) or 3 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A104-2 (GL4) or 4 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher

      Tech Tips

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


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  23. REPLACE GLOW PLUG CONTROLLER


    1. Replace the glow plug controller Click here.


    NEXT

  24. 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 Click here.

    5. Turn the ignition switch off and wait for at least 30 seconds.

    6. Turn the ignition switch to ON when the engine temperature is 40°C (104°F) or less.

    7. Turn the GTS on.

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

    9. Confirm that the DTC is not output.


    NEXT

    END

  25. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  26. 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 Click here.

    5. Turn the ignition switch off for 30 seconds or more.

    6. Turn the ignition switch to ON when the engine temperature is 40°C (104°F) or less.

    7. Turn the GTS on.

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

    9. Confirm that the DTC is not output again.


    NEXT

    END