COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Alternator Circuit

DESCRIPTION

The heater assembly receives engine operation signals from the generator control ECU assembly. 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

A01TBV1E01
*1 Generator Control ECU Assembly
*2 Heater Assembly

PROCEDURE


  1. INSPECT GENERATOR ASSEMBLY


    1. Inspect the generator assembly.

      for 1AD-FTV: Click here

      for 1ND-TV: Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE GENERATOR ASSEMBLY for 1AD-FTV: Click here
    REPLACE GENERATOR ASSEMBLY for 1ND-TV: Click here

    OK

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


    1. Disconnect the A42 heater assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A42-8 (+) - Body ground Engine is running (Generator assembly: Operating) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

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


    1. Disconnect the A52 generator control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A42-8 (+) - A52-8 (ALTL) Always Below 1 Ω
      A42-8 (+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    CHECK CHARGING SYSTEM for 1AD-FTV: Click here
    CHECK CHARGING SYSTEM for 1ND-TV: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR