COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Alternator Circuit

DESCRIPTION

The power heater ECU receives engine operation signals from the power management control ECU. 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

A005HSME03
*1 POWER MANAGEMENT CONTROL ECU
*2 POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY)

PROCEDURE


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


    1. Disconnect the A29 power heater ECU (combustion heater assembly) connector.

    2. Disconnect the F74 power management control ECU connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A29-8 (+) - F74-10 (ALTL) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A29-8 (+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A005GZOE01

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A29-8 (+) - Body ground

      Engine idling

      (Generator: Operating)

      		 11 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Heater ECU (Combustion Heater Assembly))

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT CHARGING SYSTEM


    1. Inspect the charging system Click here.


    OK

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

    NG

    GO TO CHARGING SYSTEM Click here