COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Alternator Circuit

DTC Code DTC Name
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

E267054E01

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

    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 hereClick here

    for 1ND-TV:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR