СИСТЕМА ECD Pre-heating Control Circuit

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.

B001HUGE03

WIRING DIAGRAM

B001EGXE03

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. 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.

    NG

    CHECK ECM (GIND VOLTAGE) Click here

    OK

  2. 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.

    NG

    TIGHTEN GLOW PLUG ASSEMBLY

    OK

  3. INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)


    1. Inspect the glow plug assembly Click here.


    NG

    REPLACE GLOW PLUG ASSEMBLY Click here

    OK

  4. CHECK INDICATOR LIGHTING TIME AND AFTER GLOW TIME


    NG

    REPLACE ECM Click here

    OK

  5. READ OUTPUT DTC


    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 / DTC.

    4. Read the DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO RELEVANT DTC CHART Click here

    A

  6. INSPECT GLOW RELAY ASSEMBLY


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


    NG

    REPLACE GLOW PLUG RELAY (GLOW)

    OK

  7. CHECK ECM (SREL VOLTAGE)


    1. B001I17E02
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      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
      G183-8 (SREL) - C161-5 (E1) Cranking 11 to 14 V

    NG

    REPLACE ECM Click here

    OK

  8. 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
      Tester Connection Condition Specified Condition
      G183-8 (SREL) - Relay block glow relay terminal 2 Always Below 1 Ω
      Relay block glow relay terminal 1 - Body ground Always Below 1 Ω
      G183-8 (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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. 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
      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.


    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK ECM (GIND VOLTAGE)


    1. B001CK7E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

      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
      G182-12 (GIND) - C161-5 (E1) Ignition switch ON 11 to 14 V

    4. Reconnect the ECM connector.


    OK

    REPLACE ECM Click here

    NG

  11. 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 - G182-12 (GIND) Always Below 1 Ω

    4. Reconnect the combination meter assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY)


    1. B001FS8E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      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

    4. Reconnect the combination meter assembly connector.


    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR