ECD SYSTEM, 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

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P064C Glow Plug Control Module 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 Comes on DTC stored
P066B Cylinder 1 Glow Plug Control Circuit High 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 assembly circuit

 Comes on DTC stored
P066D Cylinder 2 Glow Plug Control Circuit High 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 assembly circuit

 Comes on DTC stored
P066F Cylinder 3 Glow Plug Control Circuit High 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 assembly circuit

 Comes on DTC stored
P0671 Cylinder 1 Glow Plug Circuit/Open 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 assembly

  • Open in No. 1 glow plug assembly circuit

  • Glow plug relay assembly

 Comes on DTC stored
P0672 Cylinder 2 Glow Plug Circuit/Open 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 assembly

  • Open in No. 2 glow plug assembly circuit

  • Glow plug relay assembly

 Comes on DTC stored
P0673 Cylinder 3 Glow Plug Circuit/Open 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 assembly

  • Open in No. 3 glow plug assembly circuit

  • Glow plug relay assembly

 Comes on DTC stored
P0674 Cylinder 4 Glow Plug Circuit/Open 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 assembly

  • Open in No. 4 glow plug assembly circuit

  • Glow plug relay assembly

 Comes on DTC stored
P067B Cylinder 4 Glow Plug Control Circuit High 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 assembly circuit

 Comes on DTC stored
P166F Glow Plug Control Module Circuit Short A short circuit in a wire harness between the glow plugs is detected 3 times while the glow plug assemblies are on (2 trip detection logic).

  • Glow plug controller

  • Open or short in glow plug assembly circuit

 Comes on DTC stored

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P064C Enter check mode
P066B
P066D
P066F
P0671
P0672
P0673
P0674
P067B
P166F

WIRING DIAGRAM

Refer to DTC P052F.

Click here

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses of 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 here

  • After replacing the ECM, the new ECM needs registration (Click here) and initialization Click here.

Tech Tips

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 and turn the GTS on.

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

    4. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      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. A012HFFC02
      *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
      A115-1(BATT) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT GLOW PLUG RELAY ASSEMBLY Click here

    OK

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


    1. A012IF8C01
      *1 No. 1 Glow Plug Connector
      *a

      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
      Tester Connection Condition Specified Condition
      A114-1 (GL1) - 1 (No. 1 glow plug connector terminal) Always Below 1 Ω
      A114-2 (GL2) - 2 (No. 1 glow plug connector terminal) Always Below 1 Ω
      A117-1 (GL3) - 3 (No. 1 glow plug connector terminal) Always Below 1 Ω
      A117-2 (GL4) - 4 (No. 1 glow plug connector terminal) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    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 and GTS on.

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off.

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

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

    8. Using the GTS, switch the ECM from normal mode to check mode.

      Click here


      Powertrain > Engine and ECT > Utility
      Tester Display
      Check Mode

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

    10. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      Same DTCs (that have been erased) A
      Other DTCs B

      Tech Tips

      Check for DTCs in check mode.


    A

    GO TO STEP 20 Click here

    B

  5. REPLACE GLOW PLUG ASSEMBLY


    1. Replace the glow plug assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 7 Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      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.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

    8. Using the GTS, switch the ECM from normal mode to check mode.

      Click here


      Powertrain > Engine and ECT > Utility
      Tester Display
      Check Mode

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

    10. Confirm that the DTC is not output.


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips

      Check for DTCs in check mode.

      Result
      Proceed to
      NEXT

    NEXT

    END

  8. INSPECT GLOW PLUG RELAY ASSEMBLY


    1. Inspect the glow plug relay assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE GLOW PLUG RELAY ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR


    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. Disconnect connectors of the glow plug controller.

    5. Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A100-4 (B) - Battery positive terminal Always Below 1 Ω
      A100-1 (-S) - Body ground Always Below 1 Ω
      A100-3 (L) - A115-1 (BATT) Always Below 1 Ω
      A100-2 (+S) - B164-58 (GREL) Always Below 1 Ω
      A100-4 (B) or Battery positive terminal - Body ground Always 10 kΩ or higher
      A100-3 (L) or A115-1 (BATT) - Body ground Always 10 kΩ or higher
      A100-2 (+S) or B164-58 (GREL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  10. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 12 Click here

  11. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    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.


      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

    8. Using the GTS, switch the ECM from normal mode to check mode.

      Click here


      Powertrain > Engine and ECT > Utility
      Tester Display
      Check Mode

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

    10. Confirm that the DTC is not output.


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips

      Check for DTCs in check mode.

      Result
      Proceed to
      NEXT

    NEXT

    END

  13. REPLACE GLOW PLUG RELAY ASSEMBLY


    1. Replace the glow plug relay assembly.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 12 Click here

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


    1. A012IF8C01
      *1 No. 1 Glow Plug Connector
      *a

      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
      Tester Connection Condition Specified Condition
      A114-1 (GL1) or 1 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A114-2 (GL2) or 2 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A117-1 (GL3) or 3 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A117-2 (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.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  15. REPLACE GLOW PLUG CONTROLLER


    1. Replace the glow plug controller.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 17 Click here

  16. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  17. 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.


      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

    8. Using the GTS, switch the ECM from normal mode to check mode.

      Click here


      Powertrain > Engine and ECT > Utility
      Tester Display
      Check Mode

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

    10. Confirm that the DTC is not output.


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips

      Check for DTCs in check mode.

      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  18. REPLACE GLOW PLUG ASSEMBLY


    1. Replace the glow plug assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 22 Click here

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


    1. A012IF8C01
      *1 No. 1 Glow Plug Connector
      *a

      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
      Tester Connection Condition Specified Condition
      A114-1 (GL1) or 1 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A114-2 (GL2) or 2 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A117-1 (GL3) or 3 (No. 1 glow plug connector terminal) - Body ground Always 10 kΩ or higher
      A117-2 (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.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  20. REPLACE GLOW PLUG CONTROLLER


    1. Replace the glow plug controller.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 22 Click here

  21. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  22. 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.


      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

    8. Using the GTS, switch the ECM from normal mode to check mode.

      Click here


      Powertrain > Engine and ECT > Utility
      Tester Display
      Check Mode

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

    10. Confirm that the DTC is not output.


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips

      Check for DTCs in check mode.

      Result
      Proceed to
      NEXT

    NEXT

    END