COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Alternator Circuit

DESCRIPTION

The ECU receives engine operation signals from the L terminal of the generator assembly. If this circuit is open, the ECU will determine that the engine operation signals indicate that the engine is running. If this circuit is shorted, the ECU will determine that the engine operation signals indicate that the engine is stopped, and the heater assembly will not operate.

WIRING DIAGRAM

A003BDAE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY


    1. Remove the generator assembly.


    2. A003BIA

      Using a vernier caliper, measure the brush length.

      Standard exposed length
      10.5 to 11.5 mm (0.374 to 0.453 in.)
      Minimum exposed length
      4.5 mm (0.177 in.)
      Result
      Result Proceed to
      OK A
      NG (for 1AD-FTV) B
      NG (for 2AD-FHV) C
      NG (for 2AD-FTV) D

    B

    REPLACE GENERATOR BRUSH HOLDER ASSEMBLY Click here

    C

    REPLACE GENERATOR BRUSH HOLDER ASSEMBLY Click here

    D

    REPLACE GENERATOR BRUSH HOLDER ASSEMBLY Click here

    A

  2. INSPECT GENERATOR ROTOR ASSEMBLY


    1. Remove the generator assembly.


    2. Check the rotor for an open circuit.


      1. A003D8VE01
        Text in Illustration
        *1 Slip Ring

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Slip ring - Slip ring 20°C (68°F) 2.3 to 2.7 Ω

    3. Check if the rotor is grounded.


      1. A003BV6E01
        Text in Illustration
        *1 Slip Ring
        *2 Rotor Core

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Slip ring - Rotor Always 10 kΩ or higher

    4. Check that the slip rings are not rough or scored.

    5. A003AXJE02

      Using a vernier caliper, measure the slip ring diameter.

      Standard diameter
      14.2 to 14.4 mm (0.559 to 0.567 in.)
      Minimum diameter
      14.0 mm (0.551 in.)
    6. A003EAU

      Check that the generator rotor bearing is not rough or worn, and that it rotates smoothly.

      Result
      Result Proceed to
      The results are as specified A
      The results are not as specified (for 1AD-FTV) B
      The results are not as specified (for 2AD-FHV) C
      The results are not as specified (for 2AD-FTV) D

    B

    REPLACE GENERATOR ROTOR ASSEMBLY Click here

    C

    REPLACE GENERATOR ROTOR ASSEMBLY Click here

    D

    REPLACE GENERATOR ROTOR ASSEMBLY Click here

    A

  3. INSPECT GENERATOR DRIVE END FRAME BEARING


    1. Remove the generator assembly.


    2. A003D1I

      Check that the generator drive end frame bearing is not rough or worn, and that it rotates smoothly.

      OK
      The generator drive end frame bearing is normal.
      Result
      Result Proceed to
      OK A
      NG (for 1AD-FTV) B
      NG (for 2AD-FHV) C
      NG (for 2AD-FTV) D

    B

    REPLACE GENERATOR DRIVE END FRAME BEARING Click here

    C

    REPLACE GENERATOR DRIVE END FRAME BEARING Click here

    D

    REPLACE GENERATOR DRIVE END FRAME BEARING Click here

    A

  4. INSPECT GENERATOR PULLEY


    1. Remove the generator assembly.


    2. A003BQLE02
      Text in Illustration
      *1 Free
      *2 Lock

      Hold the center of the generator pulley and confirm that the outer ring turns counterclockwise and does not turn clockwise.

      OK
      The generator pulley is normal.
      Result
      Result Proceed to
      OK A
      NG (for 1AD-FTV) B
      NG (for 2AD-FHV) C
      NG (for 2AD-FTV) D

    B

    REPLACE GENERATOR PULLEY Click here

    C

    REPLACE GENERATOR PULLEY Click here

    D

    REPLACE GENERATOR PULLEY Click here

    A

  5. CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - GENERATOR)


    1. A003AJ6E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Heater Assembly)
      *2

      Front view of wire harness connector

      (to Generator Assembly)

      Disconnect the A54 heater assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A54-8 (+) - Body ground

      Engine running

      (Generator operating)

      		 11 to 14 V

    3. Disconnect the B16 generator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A54-8 (+) - B16-4 (L) Always Below 1 Ω
      A54-8 (+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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