COMBUSTION TYPE POWER HEATER SYSTEM TERMINALS OF ECU


  1. CHECK HEATER ASSEMBLY

    A002Q3BE02

    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
      A41-1 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      A41-2 (L) - Body ground G - Body ground Heater pump operation signal

      Engine idling

      Power heater switch on

      Pulse generation

      (See waveform 1)
      A41-3 (IG) - Body ground Y - Body ground Power heater operating signal

      Ignition switch ON

      Power heater switch on

      		 11 to 14 V
      A41-3 (IG) - Body ground Y - Body ground Power heater operating signal

      Ignition switch ON

      Power heater switch off

      		 Below 1 V
      A41-5 (B) - Body ground W - Body ground Power source Always 11 to 14 V
      A41-8 (+) - Body ground Y - Body ground Engine operating signal (Generator L terminal)

      Engine idling

      (Generator operating)

      		 11 to 14 V
    2. A002Q8ZE03

      Using an oscilloscope, check waveform 1.

      Heater Pump Control Signal
      Item Content
      Terminal No. (Symbol) A41-2 (L) - Body ground
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition

      Engine idling

      Power heater switch on