ECD SYSTEM(w/ Glow Plug Controller), Diagnostic DTC:P064C,P066B,P066D,P066F,P0671,P0672,P0673,P0674,P067B and 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

Refer to DTC P052F.

Click here

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
Table 1. DTC Detection Drive Pattern

DTC No.

DTC Detection Drive Pattern

P064C

Ignition switch ON (Engine coolant temperature is 40°C (104°F) or less)

P066B

Ignition switch ON (Engine coolant temperature is 40°C (104°F) or less)

P066D

P066F

P0671

P0672

P0673

P0674

P067B

P166F

WIRING DIAGRAM

Refer to DTC P052F.

Click here

CAUTION / NOTICE / HINT

Note:

  • When replacing the ECM, perform ECM Initialization and Registration.

    Click here

  • 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 hereClick here

Tip:

  • 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 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)

    A241159C11

    *a

    Front view of wire harness connector

    (to Glow Plug Controller)

    1. 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

      A166-1 (BATT) - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    INSPECT GLOW PLUG RELAY ASSEMBLYClick here

    OK

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

    A353758C02

    *1

    No. 1 Glow Plug Connector

    *a

    Front view of wire harness connector

    (to Glow Plug Controller)

    1. 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

      A165-1 (GL1) - 1 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

      A165-2 (GL2) - 2 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

      A168-1 (GL3) - 3 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

      A168-2 (GL4) - 4 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick 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 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 / Pending.

    9. Read the pending DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      Same DTCs (that have been erased)

      A

      Other DTCs

      B
    A

    REPLACE GLOW PLUG CONTROLLERClick here

    B

  5. REPLACE GLOW PLUG ASSEMBLY

    1. Replace the glow plug assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick 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 when the engine coolant temperature is 40°C (104°F) or less.

    7. Turn the GTS on.

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

    9. Confirm that the pending DTC is not output.

      Powertrain > Engine and ECT > Trouble Codes

    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 ASSEMBLYClick here

    OK

  9. CHECK HARNESS AND CONNECTOR (BATTERY - 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. Disconnect of the glow plug controller connectors.

    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 - Battery positive terminal

      Always

      Below 1 Ω

      A100-1 - 3 (EFI-MAIN relay)

      Always

      Below 1 Ω

      A100-3 - A166-1 (BATT)

      Always

      Below 1 Ω

      A100-2 - A169-20 (GREL)

      Always

      Below 1 Ω

      A100-4 or Battery positive terminal - Body ground

      Always

      10 kΩ or higher

      A100-1 or 3 (EFI-MAIN relay) - Body ground and other terminals

      Always

      10 kΩ or higher

      A100-3 or A166-1 (BATT) - Body ground and other terminals

      Always

      10 kΩ or higher

      A100-2 or A169-20 (GREL) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

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

    A353759C01

    *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

      A100-1 - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  11. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  12. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  13. REPLACE GLOW PLUG RELAY ASSEMBLY

    1. Replace the glow plug relay assembly.

    Result

    Proceed to

    NEXT
    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.

      Powertrain > Engine and ECT > Clear DTCs

    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 / Pending.

    9. Confirm that the pending DTC is not output.

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Proceed to

    NEXT
    NEXT

    END

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

    A353758C02

    *1

    No. 1 Glow Plug Connector

    *a

    Front view of wire harness connector

    (to Glow Plug Controller)

    1. 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

      A165-1 (GL1) - 1 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

      A165-2 (GL2) - 2 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

      A168-1 (GL3) - 3 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

      A168-2 (GL4) - 4 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  16. REPLACE GLOW PLUG CONTROLLER

    1. Replace the glow plug controller.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  17. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    Result

    Proceed to

    NEXT
    NEXT

  18. 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 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 / Pending.

    9. Confirm that the pending DTC is not output.

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Result

    Proceed to

    DTC is not output

    A

    DTC P066B, P066D, P066F and/or P067B is output

    B
    A

    END

    B

  19. REPLACE GLOW PLUG ASSEMBLY

    1. Replace the glow plug assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

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

    A353758C02

    *1

    No. 1 Glow Plug Connector

    *a

    Front view of wire harness connector

    (to Glow Plug Controller)

    1. 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

      A165-1 (GL1) - 1 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

      A165-2 (GL2) - 2 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

      A168-1 (GL3) - 3 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

      A168-2 (GL4) - 4 (No. 1 glow plug connector terminal)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  21. REPLACE GLOW PLUG CONTROLLER

    1. Replace the glow plug controller.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  22. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result

    Proceed to

    NEXT
    NEXT

  23. 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 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 / Pending.

    9. Confirm that the pending DTC is not output.

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Proceed to

    NEXT
    NEXT

    END