COMBUSTION TYPE POWER HEATER SYSTEM > TERMINALS OF ECU

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POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY)

E124453E04

  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
    A45-1 (E) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 V
    A45-2 (L) - Body ground
    		L - Body ground
    		Fuel pump operation signal
    		Engine idling
    Power heater switch on
    		Pulse generation
    (See waveform )
    A45-3 (IG) - Body ground
    		LG - 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
    A45-5 (B) - Body ground
    		R - Body ground
    		Power source
    (Back-up)
    		Always
    		11 to 14 V
    A45-8 (+) - Body ground
    		P - Body ground
    		Engine operating signal (Generator L terminal)
    		Engine idling
    (Generator: Operating)
    		11 to 14 V



    2. E177181E01

  2. Waveform: Using an oscilloscope
    Heater Fuel Pump Control Signal 
    Terminal Name
    		A45-2 (L) - Body ground
    Tester Range
    		2 V/DIV., 20 ms./DIV.
    Condition
    		Engine idling
    Power heater switch on