COMBUSTION TYPE POWER HEATER SYSTEM TERMINALS OF ECU


  1. POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY)

    A005HF0E02

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A29-1 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 V
      A29-2 (L) - Body ground L - Body ground Fuel pump operation signal

      Engine idling

      Power heater switch on

      Pulse generation

      (See waveform )
      A29-3 (IG) - Body ground W - Body ground Power heater operating signal

      Ignition switch ON

      Power heater switch on

      		 11 to 14 V

      Ignition switch off

      Power heater switch off

      		 Below 1 V
      A29-5 (B) - Body ground R - Body ground

      Power source

      (Back-up)

      		 Always 11 to 14 V
      A29-8 (+) - Body ground R - Body ground Engine operating signal (Generator L terminal)

      Engine idling

      (Generator: Operating)

      		 11 to 14 V
    2. A005LI9E03
      *a 2 V/DIV.
      *b 20 ms./DIV.

      Waveform: Using an oscilloscope

      Heater Fuel Pump Control Signal
      Terminal Name A29-2 (L) - Body ground
      Tester Range 2 V/DIV., 20 ms./DIV.
      Condition

      Engine idling

      Power heater switch on