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 control unit is detected as being stuck on 3 times while the glow plugs 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 plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 1 glow plug

  • Short in No. 1 glow plug 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 plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 2 glow plug

  • Short in No. 2 glow plug 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 plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 3 glow plug

  • Short in No. 3 glow plug 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 plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 1 glow plug

  • Open in No. 1 glow plug circuit

  • GLOW relay

 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 plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 2 glow plug

  • Open in No. 2 glow plug circuit

  • GLOW relay

 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 plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 3 glow plug

  • Open in No. 3 glow plug circuit

  • GLOW relay

 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 plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 4 glow plug

  • Open in No. 4 glow plug circuit

  • GLOW relay

 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 plugs are on (2 trip detection logic).

  • Glow plug controller

  • No. 4 glow plug

  • Short in No. 4 glow plug 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 plugs are on (2 trip detection logic).

  • Glow plug controller

  • Short in glow plug circuit

 Comes on DTC stored

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P064C Enter check mode
P066B
P066D
P066F
P067B
P0671
P0672
P0673
P0674
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 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
      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 TERMINAL VOLTAGE (POWER SOURCE OF GLOW PLUG CONTROLLER)


    1. B00269LC13
      *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
      A56-1(BATT) - Body ground IG ON 11 to 14 V

    3. Reconnect the glow plug controller connector.

      Result
      Proceed to
      OK
      NG

    NG

    INSPECT GLOW RELAY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR


    1. Disconnect connectors of the glow plug controller.

      B0026L5C06
      *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)

    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
      C98-1 (GL1) - No. 1 glow plug connector terminal 1 Always Below 1 Ω
      C98-2 (GL2) - No. 1 glow plug connector terminal 2 Always Below 1 Ω
      C97-1 (GL3) - No. 1 glow plug connector terminal 3 Always Below 1 Ω
      C97-2 (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.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. INSPECT GLOW PLUG


    1. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    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 ignition switch to ON.

    4. Turn the GTS on.

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


      Powertrain > Engine and ECT > Utility
      Tester Display
      Check Mode

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

    7. 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 19 Click here

    B

  5. REPLACE GLOW PLUG


    1. Replace the glow plug.

      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. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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


      Powertrain > Engine and ECT > Utility
      Tester Display
      Check Mode

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

    8. Confirm that the DTC is not output again.


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips

      Check for DTCs in check mode.

      Result
      Proceed to
      NEXT

    NEXT

    END

  8. INSPECT GLOW RELAY


    1. Inspect the GLOW relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE GLOW RELAY 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 relay from the engine room relay block and junction block.

    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
      GLOW relay terminal5 - Battery positive terminal Always Below 1 Ω
      GLOW relay terminal 1 - Body ground Always Below 1 Ω
      GLOW relay terminal 3 - A56-1 (BATT) Always Below 1 Ω
      GLOW relay terminal 2 - C85-15 (GREL) Always Below 1 Ω
      GLOW relay terminal 5 or Battery positive terminal - Body ground andother terminals Always 10 kΩ or higher
      GLOW relay terminal 3 or A56-1 (BATT) - Body ground andother terminals Always 10 kΩ or higher
      GLOW relay terminal 2 or G85-15 (GREL) - Body ground andother terminals 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 7 Click here

  11. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 7 Click here

  12. REPLACE GLOW RELAY


    1. Replace the GLOW relay.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 7 Click here

  13. CHECK HARNESS AND CONNECTOR


    1. Disconnect connectors of the glow plug controller.

      B0026L5C08
      *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)

    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
      C98-1 (GL1) or No. 1 glow plug connector terminal 1 - Body ground Always 10 kΩ or higher
      C98-2 (GL2) or No. 1 glow plug connector terminal 2 - Body ground Always 10 kΩ or higher
      C97-1 (GL3) or No. 1 glow plug connector terminal 3 - Body ground Always 10 kΩ or higher
      C97-2 (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.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  14. REPLACE GLOW PLUG CONTROLLER


    1. Replace the glow plug controller.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 16 Click here

  15. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  16. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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


      Powertrain > Engine and ECT > Utility
      Tester Display
      Check Mode

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

    8. Confirm that the DTC is not output again.


      Powertrain > Engine and ECT > Trouble Codes
      OK
      No DTC is output.

      Tech Tips

      Check for DTCs in check mode.

      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  17. REPLACE GLOW PLUG


    1. Replace the glow plug.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  18. CHECK HARNESS AND CONNECTOR


    1. Disconnect connectors of the glow plug controller.

      B0026L5C12
      *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)

    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
      C98-1 (GL1) or No. 1 glow plug connector terminal 1 - Body ground Always 10 kΩ or higher
      C98-2 (GL2) or No. 1 glow plug connector terminal 2 - Body ground Always 10 kΩ or higher
      C97-1 (GL3) or No. 1 glow plug connector terminal 3 - Body ground Always 10 kΩ or higher
      C97-2 (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.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  19. REPLACE GLOW PLUG CONTROLLER


    1. Replace the glow plug controller.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 21 Click here

  20. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  21. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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


      Powertrain > Engine and ECT > Utility
      Tester Display
      Check Mode

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

    8. Confirm that the DTC is not output again.


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips

      Check for DTCs in check mode.

      Result
      Proceed to
      NEXT

    NEXT

    END