COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Alternator Circuit

DESCRIPTION

The ECU receives engine operation signals from the L terminal of the power management control ECU. If this circuit is open or shorted, the ECU may incorrectly determine whether the engine is running or stopped. As a result, the heater assembly may not operate properly.

WIRING DIAGRAM

A002OEZE01

PROCEDURE


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


    1. A002MNQE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Heater Assembly)

      Disconnect the A41 heater connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A41-8 (+) - Body ground

      Engine running

      (Generator operating)

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. w/ Entry and Start System:


      1. A002NN5E02
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Heater Assembly)
        *2

        Front view of wire harness connector

        (to Power Management Control ECU)

        Disconnect the A41 heater connector.

      2. Disconnect the H71 power management control ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A41-8 (+) - H71-7 (ALTL) Always Below 1 Ω
        A41-8 (+) - Body ground Always 10 kΩ or higher

    2. w/o Entry and Start System:


      1. A002MDQE01
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Heater Assembly)
        *2

        Front view of wire harness connector

        (to Power Management Control ECU)

        Disconnect the A41 heater connector.

      2. Disconnect the H72 power management control ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A41-8 (+) - H72-7 (ALTL) Always Below 1 Ω
        A41-8 (+) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR