EMISSION CONTROL SYSTEM Pre-heating Control Circuit

DESCRIPTION

When the ignition switch turns ON, the emission ECU calculates the glow indicator lighting time/heating correspondings to the coolant temperature at that time and turns ON the glow indicator light/glow plug relay. As the ceramics is used for a glow plug material, the current control is not performed.

A01KFNJE01

WIRING DIAGRAM

A01KIP4E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK GLOW INDICATOR LIGHT


    1. Turn the ignition switch ON.

    2. Check that the glow indicator lights up.

      OK
      GLOW INDICATOR LIGHTS UP FOR 0.5 SEC. OR MORE

    OK

    GO TO STEP

    NG

  2. CHECK EMISSION CONTROL ECU (EMISSION ECU-BODY GROUND)


    1. A01KF5EE01

      Disconnect the emission ECU connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage between terminal GIND of the emission ECU connector and body ground Click here.

      VOLTAGE
      9 - 14 V

    OK

    CHECK AND REPLACE EMISSION CONTROL ECU Click here

    NG

  3. CHECK FUSE (GAUGE)


    1. A01KEO0E02
      Text in Illustration
      *1 GAUGE

      Remove the GAUGE fuse.

    2. Measure the continuity of the GAUGE fuse.

      OK
      CONTINUITY

    NG

    REPLACE FUSE (GAUGE)

    OK

  4. CHECK GLOW INDICATOR LIGHT BULB


    NG

    REPLACE BULB

    OK

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR (COMBINATION METER AND EMISSION ECU, COMBINATION METER - GAUGE FUSE) Click here

  5. CHECK INDICATOR LIGHTING TIME AND AFTER GLOW TIME

    Click here


    NG

    CHECK AND REPLACE EMISSION CONTROL ECU Click here

    OK

  6. CHECK DTC


    1. Are there any DTC being output?


    YES

    GO TO RELEVANT DTC CHART Click here

    NO

  7. INSPECT GLOW PLUG RELAY ASSEMBLY

    Click here


    NG

    REPLACE GLOW PLUG RELAY ASSEMBLY

    OK

  8. CHECK EMISSION CONTROL ECU


    1. Disconnect the emission ECU connector.

    2. Turn the ignition switch to START position.

    3. A01KH0WE06

      Measure the voltage between terminal SREL of the emission ECU and body ground at cranking Click here.

      VOLTAGE
      9 - 14 V

    NG

    CHECK AND REPLACE EMISSION CONTROL ECU Click here

    OK

  9. CHECK WIRE HARNESS OR CONNECTOR (GLOW PLUG RELAY - EMISSION ECU, GLOW PLUG RELAY - BODY GROUND)


    1. Remove the GLOW relay from the R/B No.2.

    2. Disconnect the emission ECU connector.

    3. A01KH0WE06

      Check the continuity between terminals SREL of the ECU connector and 3 of the GLOW relay in the R/B No.2 Click here.

      RESISTANCE
      1 Ω or less

    4. Check for short between terminals SREL of the ECU connector and 3 of the GLOW relay in the R/B No.2 Click here.

      RESISTANCE
      1 MΩ or more
    5. A01KG43E02
      Text in Illustration
      *1 GLOW Relay

      Check the continuity between 3 of the GLOW relay in the R/B No.2 and the body ground Click here.

      RESISTANCE
      1 Ω or less

    6. Check the continuity between 3 of the GLOW relay in the R/B No.2 and the body ground Click here.

      RESISTANCE
      1 MΩ or more

    NG

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR

    OK

  10. CHECK GLOW PLUG ASSEMBLY


    1. Check the resistance of the glow plug Click here.


    NG

    REPLACE GLOW PLUG ASSEMBLY

    OK

  11. INSPECT GLOW PLUG ASSEMBLY


    1. Inspect the glow plug installation.


    NG

    TIGHTEN GLOW PLUG

    OK

  12. CHECK WIRE HARNESS (GLOW PLUG RELAY - GLOW PLUG)


    1. Remove the GLOW relay from the R/B No.2.

    2. A01KG43E02
      Text in Illustration
      *1 GLOW Relay

      Check continuity between the GLOW relay in the R/B No.2 and the glow plug.

      RESISTANCE
      1 Ω or less

    3. Check for short between the GLOW relay in the R/B No.2 and the glow plug.

      RESISTANCE
      1 MΩ or more

    NG

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here