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СИСТЕМА ECD Pre-heating Control Circuit

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DTC Code DTC Name
  Pre-heating Control Circuit
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DESCRIPTION

When the ignition switch is turned to ON, the ECM calculates the glow indicator lighting time/heating corresponding to the coolant temperature at that time and turns on the glow indicator light/glow plug relay (GLOW).

As ceramic is used for glow plug assembly material, current control is not performed.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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PROCEDURE


  1. Click here

    CHECK GLOW INDICATOR LIGHT


    1. Turn the ignition switch to ON.

    2. Check that the glow indicator light comes on.

      OK
      The glow indicator light remains on for 0.5 seconds or more, and then goes off.

  2. Click here

    CHECK GLOW PLUG ASSEMBLY (INSTALLATION)


    1. Check that the glow plug assembly and glow plug wire are securely installed.

      OK
      The glow plug assembly and glow plug wire are securely installed.

  3. Click here

    INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)


    1. Inspect the glow plug assembly (Click here).


  4. Click here

    CHECK INDICATOR LIGHTING TIME AND AFTER GLOW TIME


  5. Click here

    READ OUTPUT DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

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

    4. Read the DTCs (Click here).

      Table 1. Result
      Result Proceed to
      DTC is not output A
      DTC is output B

  6. Click here

    INSPECT GLOW RELAY ASSEMBLY


    1. Inspect the glow plug relay (GLOW) (Click here).


  7. Click here

    CHECK ECM (SREL VOLTAGE)


    1. A00O5ERE95

      Turn the ignition switch to the start position.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G61-2 (SREL) - C101-14 (E1) Cranking 11 to 14 V
      Table 2. Text in Illustration
      *a

      Component with harness connected

      (ECM)

  8. Click here

    CHECK HARNESS AND CONNECTOR (GLOW RELAY - ECM AND BODY GROUND)


    1. Disconnect the ECM connector.

    2. Remove the glow relay from the engine room relay block.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      G61-2 (SREL) - Relay block glow relay terminal 2 Always Below 1 Ω
      Relay block glow relay terminal 1 - Body ground Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      G61-2 (SREL) or relay block glow relay terminal 2 - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the glow relay.


  9. Click here

    CHECK HARNESS AND CONNECTOR (GLOW PLUG RELAY (GLOW) - GLOW PLUG ASSEMBLY AND BATTERY)


    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.

    4. Disconnect the glow plug wire.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      Relay block glow relay terminal 3 - C114-1 Always Below 1 Ω
      Relay block glow relay terminal 5 - Positive (+) battery terminal Always Below 1 Ω
      Note:

      After reconnecting the battery cable, the radio and clock need to be adjusted as they were previously.

    6. Reinstall the glow relay.

    7. Reconnect the glow plug wire.

    8. Reconnect the cable to the positive (+) battery terminal.

    9. Reconnect the cable to the negative (-) battery terminal.


  10. Click here

    CHECK ECM (GIND VOLTAGE)


    1. A00O550E17

      Disconnect the ECM 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 Switch Condition Specified Condition
      G62-1 (GIND) - C101-14 (E1) Ignition switch ON 11 to 14 V
      Table 3. Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

    4. Reconnect the ECM connector.


  11. Click here

    CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER ASSEMBLY)


    1. Disconnect the combination meter assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G7-8 - G62-1 (GIND) Always Below 1 Ω

    4. Reconnect the combination meter assembly connector.

    5. Reconnect the ECM connector.


  12. Click here

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY)


    1. A00O9UHE06

      Disconnect the combination meter assembly 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 Switch Condition Specified Condition
      G6-28 - Body ground Ignition switch ON 11 to 14 V
      Table 4. Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

    4. Reconnect the combination meter assembly connector.


  13. Click here

    TIGHTEN GLOW PLUG ASSEMBLY

  14. Click here

    REPLACE GLOW PLUG ASSEMBLYClick here

  15. Click here

    REPLACE ECMClick here

  16. Click here

    GO TO RELEVANT DTC CHARTClick here

  17. Click here

    REPLACE GLOW PLUG RELAY (GLOW)

  18. Click here

    REPLACE ECMClick here

  19. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here

  21. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here