COMBUSTION TYPE POWER HEATER SYSTEM TERMINALS OF ECU


  1. INSPECT HEATER ASSEMBLY

    A00YTTKN02

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A33-1 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      A33-2 (L) - Body ground G - Body ground Fuel pump operation signal

      Engine running

      Heater switch assembly on

      Pulse generation

      (See waveform 1)
      A33-3 (IG) - Body ground LG - Body ground Power heater operating signal

      Ignition switch ON

      Heater switch assembly on

      		 11 to 14 V
      A33-3 (IG) - Body ground LG - Body ground Power heater operating signal

      Ignition switch off

      Heater switch assembly off

      		 Below 1 V
      A33-5 (B) - Body ground R - Body ground Power source Always 11 to 14 V
      A33-8 (+) - Body ground

      W - Body ground*1

      V - Body ground*2

      		 Engine operating signal

      Engine running

      (Generator assembly operating)

      		 11 to 14 V

      *1: w/ Stop and Start System

      *2: w/o Stop and Start System

    2. A00YRSLE04

      Waveform 1:

      Heater Fuel Pump Control Signal
      Item Content
      Terminal No. (Symbol) A33-2 (L) - Body ground
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Vehicle Condition

      Engine running

      Heater switch assembly on