COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Alternator Circuit

DESCRIPTION

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

WIRING DIAGRAM

A0117G2E01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT GENERATOR


    1. Inspect the generator.

      Item See page
      On-Vehicle Inspection

      Click here

      Inspection

      Click here


    NG

    REPLACE GENERATOR Click here

    OK

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


    1. A0117GME01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Heater ECU (Combustion Heater Assembly))
      *2

      Front view of wire harness connector

      (to Generator)

      Disconnect the A45 power heater ECU (combustion heater assembly) connector.

    2. Disconnect the B45 generator connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A45-8 (+) - B45-4 (L) Always Below 1 Ω
      A45-8 (+) - Body ground Always 10 kΩ or higher

    4. Reconnect the generator connector.

    5. Reconnect the power heater ECU (combustion heater assembly) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY) - BATTERY)


    1. A01194QE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Heater ECU (Combustion Heater Assembly))

      Disconnect the A45 power heater ECU (combustion heater assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A45-8 (+) - Body ground

      Engine idling

      (Generator: Operating)

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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