СИСТЕМА ECD Pre-heating Control Circuit

DESCRIPTION

When the ignition switch turns 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.

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

A01DY1IE02

WIRING DIAGRAM

A01E205E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK GLOW INDICATOR LIGHT


    1. Turn the ignition switch 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 (INSTALLATION)


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

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

    NG

    TIGHTEN GLOW PLUG

    OK

  3. INSPECT GLOW PLUG


    1. A01DYKLE01

      Measure the resistance of the glow plug.

      Standard resistance
      0.72 Ω at 20°C (68°F)

      Tech Tips

      The higher the temperature, the smaller the resistance becomes and vice versa.


    NG

    REPLACE GLOW PLUG

    OK

  4. CHECK FOR INDICATOR LIGHTING TIME AND AFTER GLOW TIME


    NG

    REPLACE ECM

    OK

  5. READ OUTPUT DTC


    1. Read the DTC Click here.

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

    B

    GO TO RELEVANT DTC CHART

    A

  6. INSPECT GLOW RELAY (Marking: GLOW)


    1. A01DVUME01

      Measure the resistance of the glow relay.

      Standard resistance
      Tester Connection Specified Condition
      3 - 5

      10 kΩ or higher

      (No continuity)
      3 - 5

      Below 1 Ω

      (when battery voltage is applied to terminals 1 and 2)

    NG

    REPLACE GLOW RELAY

    OK

  7. CHECK ECM (SREL VOLTAGE)


    1. A01E2VTE50

      Turn the ignition switch to the START position.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Condition Specified Condition
      E20-2 (SREL) - E23-14 (E1) Cranking 9 to 14 V

    NG

    REPLACE ECM

    OK

  8. CHECK WIRE HARNESS (GLOW RELAY [Marking: GLOW] - ECM AND BODY GROUND)


    1. A01DXAHE01

      Disconnect the E20 ECM connector.

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

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      Relay block glow relay terminal 2 - E20-2 (SREL) Below 1 Ω
      Relay block glow relay terminal 1 - Body ground Below 1 Ω
      E20-2 (SREL) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  9. CHECK WIRE HARNESS (GLOW RELAY [Marking: GLOW] - GLOW PLUG AND BATTERY)


    1. A01DY2EE04

      Disconnect the battery negative (-) cable.

    2. Disconnect the battery positive (+) cable.

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

    4. Disconnect the glow plug wire.

    5. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      Relay block glow relay terminal 3 - Glow plug wire Below 1 Ω
      Relay block glow relay terminal 5 - Positive terminal of the battery Below 1 Ω

      Note

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


    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

  10. CHECK ECM (GIND VOLTAGE)


    1. A01E0T9E08

      Disconnect the E21 ECM connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage of the wire harness side connectors.

      Standard voltage
      Tester Connection Specified Condition
      E21-1 (GIND) - E23-14 (E1) 9 to 14 V

    OK

    REPLACE ECM

    NG

  11. CHECK WIRE HARNESS (ECM - COMBINATION METER)


    1. A01E2VUE04

      Disconnect the C25 combination meter connector.

    2. Disconnect the E21 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      C25-40 - E21-1 (GIND) Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  12. CHECK FUSE (MET FUSE)


    1. A01DYRPE01

      Remove the MET fuse from the instrument panel junction block.

    2. Measure the resistance of the fuse.

      Standard resistance
      Tester Connection Specified Condition
      MET fuse Below 1 Ω

    NG

    CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE, AND REPLACE FUSE

    OK

  13. CHECK WIRE HARNESS (COMBINATION METER - BATTERY)


    1. A01DZNSE07

      Disconnect the C25 combination meter connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage of the wire harness side connector.

      Standard voltage
      Tester Connection Specified Condition
      C25-21 - Body ground 9 to 14 V

    OK

    REPLACE COMBINATION METER

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR