COMBUSTION TYPE POWER HEATER SYSTEM TERMINALS OF ECU


  1. INSPECT HEATER ASSEMBLY

    A00Y9YIN01

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A42-1 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      A42-2 (L) - Body ground G - Body ground Fuel pump operation signal

      Engine running

      Heater switch assembly: On

      Pulse generation

      (See waveform 1)
      A42-3 (IG) - Body ground Y - Body ground Power heater operating signal

      Ignition switch ON

      Heater switch assembly: On

      		 11 to 14 V
      A42-3 (IG) - Body ground Y - Body ground Power heater operating signal

      Ignition switch off

      Heater switch assembly: Off

      		 Below 1 V
      A42-5 (B) - Body ground W - Body ground Power source Always 11 to 14 V
      A42-8 (+) - Body ground Y - Body ground Engine operating signal

      Engine running

      (Generator assembly: Operating)

      		 11 to 14 V
    2. A00YB3KN01

      Waveform 1:

      Heater Fuel Pump Control Signal
      Item Content
      Terminal No. (Symbol) A42-2 (L) - Body ground
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Vehicle Condition

      Engine running

      Heater switch assembly: On