COMBUSTION TYPE POWER HEATER SYSTEM ECU Power Source Circuit

DESCRIPTION

This is power source circuit for the ECU (heater assembly).

WIRING DIAGRAM

A004OTDE20

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Before performing the following procedures, check the battery and generator assembly and confirm that they are operating normally.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - BATTERY AND BODY GROUND)


    1. A004QZGE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Heater Assembly)

      Disconnect the A54 heater assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A54-5 (B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A54-1 (E) - Body ground Always Below 1 Ω

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR