COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Alternator Circuit

DESCRIPTION

The heater assembly receives engine operation signals from the battery current sensor assembly*1 or generator assembly*2. If this circuit is open, the heater assembly will determine that the engine operation signals indicate on. If this circuit is shorted, the heater assembly will determine that the engine operation signals indicate off and the heater assembly will not operate.


WIRING DIAGRAM

A01QR12E02

CAUTION / NOTICE / HINT

Note

First, confirm that there are no malfunctions in the LIN communication systems. Refer to the how to proceed with troubleshooting procedure.

Click here

PROCEDURE


  1. INSPECT GENERATOR ASSEMBLY


    1. Remove the generator assembly.


    2. Inspect the generator assembly.


      Result
      Proceed to
      OK (for 2WW)
      OK (except 2WW)
      NG

    OK (except 2WW)

    CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - GENERATOR ASSEMBLY) Click here

    NG

    REPLACE GENERATOR ASSEMBLY for 2AD-FHV: Click here for 2AD-FTV: Click here for 2WW: Click here

    OK (for 2WW)

  2. CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - GENERATOR CONTROL ECU ASSEMBLY)


    1. A01QSWGC02
      *a

      Front view of wire harness connector

      (to Heater Assembly)

      Disconnect the heater assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A33-8 (+) - Body ground Engine is running (Generator assembly operate) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - BATTERY CURRENT SENSOR ASSEMBLY) Click here

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


    1. A01QSWGC02
      *a

      Front view of wire harness connector

      (to Heater Assembly)

      Disconnect the heater assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A33-8 (+) - Body ground Engine is running (Generator assembly operate) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - GENERATOR ASSEMBLY) Click here

  4. CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - BATTERY CURRENT SENSOR ASSEMBLY)


    1. Disconnect the A33 heater assembly connector.

    2. Disconnect the A58 battery current sensor assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A33-8 (+) - A58-8 (ALTL) Always Below 1 Ω
      A33-8 (+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BATTERY CURRENT SENSOR ASSEMBLY for 2AD-FHV: Click here for 2AD-FTV: Click here for 2WW: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the A33 heater assembly connector.

    2. Disconnect the B61 generator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A33-8 (+) - B61-4 (L) Always Below 1 Ω
      A33-8 (+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE GENERATOR ASSEMBLY for 2AD-FHV: Click here for 2AD-FTV: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR