ECD SYSTEM DPF Switch and Buzzer Circuit

DESCRIPTION

The DPF (Diesel Particulate Filter) is controlled by the ECM to activate the forcible regeneration function automatically. However, depending on driving conditions, the forcible regeneration function may not be activated. In such a case, the indicator light on the combination meter assembly and the DPF switch light blink to inform the driver. When the DPF switch assembly is pressed with the vehicle stopped, RGSW signals will be input into the ECM and the forcible regeneration function will activate.

If the vehicle continues to be driven without performing forcible regeneration while the indicator light is ON, a buzzer intermittently sounds to inform the driver.

Tech Tips

If the buzzer intermittently sounds, the brake vacuum warning switch may have been turned on.

In this case, inspect the brake vacuum warning switch circuit first.

A01CH30E01

WIRING DIAGRAM

A01CHMVE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK BUZZER OPERATION


    1. Check the buzzer sounds.

      Result
      Sounds Proceed to
      The buzzer sounds intermittently A
      The buzzer sounds continuously B

    B

    CHECK BRAKE VACUUM WARNING BUZZER CIRCUIT

    A

  2. CHECK DPF SWITCH ASSEMBLY (POWER SOURCE)


    1. A01CJAKE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to DPF Switch Assembly)

      Disconnect the DPF switch 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
      D21-6 - Body ground Ignition switch ON 18 to 27 V
      D21-2 - Body ground Ignition switch ON 18 to 27 V

    4. Turn the ignition switch off.

    5. Reconnect the DPF switch assembly connector.


    NG

    CHECK HARNESS AND CONNECTOR (DPF SWITCH ASSEMBLY - IGNITION SWITCH ASSEMBLY) Click here

    OK

  3. INSPECT DPF SWITCH ASSEMBLY (RESISTANCE)


    1. A01CHMCE05
      Text in Illustration
      *1

      Component without harness connected

      (DPF Switch Assembly)

      Disconnect the DPF switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      6 - 7 DPF switch on Below 1 Ω
      6 - 7 DPF switch off 10 kΩ or higher

    3. Reconnect the DPF switch assembly connector.


    NG

    REPLACE DPF SWITCH ASSEMBLY Click here

    OK

  4. INSPECT DPF SWITCH ASSEMBLY (ILLUMINATED)


    1. A01CHMCE05
      Text in Illustration
      *1

      Component without harness connected

      (DPF Switch Assembly)

      Remove the DPF switch assembly.

    2. Check that the illumination comes on.

      Result
      Connector Connection Condition Illumination
      Apply the battery voltage terminal 2 (+) and 3 (-) Always Comes on

    3. Reinstall the DPF switch assembly.


    NG

    REPLACE DPF SWITCH ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (DPF SWITCH ASSEMBLY - ECM)


    1. Disconnect the DPF switch connector.

    2. Disconnect the ECM connectors.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D21-7 - E24-15 (RGSW) Always Below 1 Ω
      D21-3 - E25-10 (W2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D21-7 or E24-15 (RGSW) - Body ground Always 10 kΩ or higher
      D21-3 or E25-10 (W2) - Body ground Always 10 kΩ or higher

    4. Reconnect the DPF switch assembly connector.

    5. Reconnect the ECM connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DPF SWITCH ASSEMBLY - ECM)

    OK

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

  6. CHECK HARNESS AND CONNECTOR (DPF SWITCH ASSEMBLY - IGNITION SWITCH ASSEMBLY)


    1. Disconnect the DPF switch assembly connector.

    2. Disconnect the ignition switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D21-6 - I6-10 (IG1) Always Below 1 Ω
      D21-2 - I6-10 (IG1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D21-6 or I6-10 (IG1) - Body ground Always 10 kΩ or higher
      D21-2 or I6-10 (IG1) - Body ground Always 10 kΩ or higher

    4. Reconnect the DPF switch assembly connector.

    5. Reconnect the ignition switch assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DPF SWITCH ASSEMBLY - IGNITION SWITCH ASSEMBLY)

    OK

  7. INSPECT IGNITION SWITCH ASSEMBLY


    1. A01CHNME12
      Text in Illustration
      *1

      Component without harness connected

      (Ignition Switch Assembly)

      Disconnect the ignition switch assembly connector.

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

      Standard Resistance
      Tester Connection Ignition Switch Position Specified Condition
      All terminals LOCK 10 kΩ or higher
      9 (AM1) - 10 (IG1) ON Below 1 Ω

    3. Reconnect the ignition switch assembly connector.


    NG

    REPLACE IGNITION SWITCH ASSEMBLY

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH ASSEMBLY - BATTERY)