Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

Heater & Air Conditioning System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Air Conditioning. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

  1. CHECK AIR CONDITIONING AMPLIFIER

Air Conditioning System (For Manual Air Conditioning System) -- Terminals Of Ecu



CHECK AIR CONDITIONING AMPLIFIER

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  1. Measure the voltage of the connectors.

    HINT:
    Check from the rear of the connector while it is connected to the air conditioning amplifier.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    LOCK (E42-3) - SG-2 (E42-10) (*2)
    		W - G
    		Compressor lock sensor signal
    		Ignition switch on (IG)
    AUTO switch ON
    A/C switch ON
    Magnetic clutch ON
    		Pulse generation
    (see waveform 4)
    S5-3 (E42-7) - GND (E42-24)
    		B - W-B
    		Power supply for pressure sensor
    		Ignition switch on (IG)
    		4.5 to 5.5 V
    CANH (E42-8) - GND (E42-24)
    		V - W-B
    		Hi-level CAN bus line
    		Ignition switch on (IG)
    		Pulse generation
    (see waveform 1)
    CANL (E42-9) - GND (E42-24)
    		W - W-B
    		Lo-level CAN bus line
    		Ignition switch on (IG)
    		Pulse generation
    (see waveform 2)
    SG-2 (E42-10) - Body ground
    		G - Body ground
    		Ground for pressure sensor
    		Always
    		Below 1 V
    PRE (E42-12) - SG-2 (E42-10)
    		L - G
    		Air conditioning pressure sensor signal
    		Refrigerant pressure: normal
    		0.76 to 4.74 V
    PRE (E42-12) - SG-2 (E42-10)
    		L - G
    		Air conditioning pressure sensor signal
    		Refrigerant pressure: Abnormal (less than 0.196 MPa [2.0 kgf/cm2, 28 psi]
    		Below 0.76 V
    PRE (E42-12) - SG-2 (E42-10)
    		L - G
    		Air conditioning pressure sensor signal
    		Refrigerant pressure: Abnormal (more than 3.14 MPa [32 kgf/cm2, 455 psi])
    		4.74 V or more
    SOL+ (E42-13) - GND (E42-24)
    		GR - W-B
    		A/C compressor operation signal
    		Engine idling
    		Pulse generation
    (see waveform 3)
    Heater control (blower switch): 1
    A/C switch ON
    IG+ (E42-14) - GND (E42-24)
    		Y - W-B
    		Power source (IG)
    		Ignition switch on (IG)
    		10 to 14 V
    MGC (E42-15) - GND (E42-24) (*2)
    		V - W-B
    		Magnetic clutch relay signal
    		Ignition switch on (IG)
    Magnetic clutch OFF
    		10 to14 V
    MGC (E42-15) - GND (E42-24) (*2)
    		V - W-B
    		Magnetic clutch relay signal
    		Ignition switch on (IG)
    Magnetic clutch ON
    		Below 1.5 V
    SBLW (E42-21) - GND (E42-24)
    		GR - W-B
    		Blower motor ON signal
    		Ignition switch on (IG)
    		10 to 14 V → Below 1 V
    Heater control (blower switch): 0 → 1
    TE (E42-22) - SG-3 (E42-23)
    		W - B
    		Evaporator temperature sensor signal
    		Ignition switch on (IG)
    		1 to 1.3 V
    Temperature near evaporator: 15°C (59°F)
    SG-3 (E42-23) - Body ground
    		B - Body ground
    		Ground for evaporator temperature sensor
    		Always
    		Below 1 V
    GND (E42-24) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 V
    A/C (E42-27) - GND (E42-24)
    		P - W-B
    		A/C switch signal
    		Ignition switch on (IG)
    		Below 1 V → 10 to 14 V
    A/C switch OFF → ON
    LED (E42-28) - Body ground
    		GR - Body ground
    		A/C switch indicator signal
    		Engine idling
    		10 to 14 V → Below 4 V
    A/C switch ON
    Heater control (blower switch): 0 → 1
    B (E43-1) - GND (E42-24) (*1)
    		R - W-B
    		Power source (Back-up)
    		Always
    		10 to 14 V
    PTC1 (E43-9) - GND (E42-24) (*1)
    		W - W-B
    		PTC NO. 1 heater relay operation signal
    		Engine idling
    		Below 1 V → 10 to 14 V
    Air mix control knob: Max hot
    Engine coolant temperature: Below 65°C (149°F)
    Ambient temperature: Below 10°C (50°F)
    Light control switch: OFF
    Heater control (blower switch): 0 → 1
    Waiting time: 10 seconds
    PTC2 (E43-10) - GND (E42-24) (*1)
    		B - W-B
    		PTC NO. 2 heater relay operation signal
    		Engine idling
    		Below 1 V → 10 to 14 V
    Air mix control knob: Max hot
    Engine coolant temperature: Below 65°C (149°F)
    Ambient temperature: Below 10°C (50°F)
    Light control switch: OFF
    Heater control (blower switch): 0 → 1
    Waiting time: 20 seconds
    HEAT (E43-14) - Body ground (*1)
    		W - Body ground
    		MAX HOT switch detection signal
    		Ignition switch on (IG)
    		10 to 14 V
    Air mix control knob: Max hot
    Heater control (blower switch): 1
    HLS (E43-23) - Body ground (*1)
    		BR - Body ground
    		Headlight control signal
    		Engine idling
    		Below 1 V
    Light control switch: head position
    ALT (E43-24) - GND (E42-24) (*1)
    		B - W-B
    		Generator operation signal
    		Engine idling
    		Pulse generation
    HINT:
    *1: w/ PTC heater
    *2: for 2GR-FE


    2. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  2. Using an oscilloscope, measure the waveform 1.

    CAN communication signal
    Item
    		Content
    Symbols (Terminal No.)
    		CANH (E42-8) - GND (E42-24)
    Tool Setting
    		1 V/DIV., 10 μsec./DIV.
    Condition
    		Ignition switch on (IG)
    HINT:
    The waveform varies depending on the CAN communication signal.


    3. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  3. Using an oscilloscope, measure the waveform 2.

    CAN communication signal
    Item
    		Content
    Symbols (Terminal No.)
    		CANL (E42-9) - GND (E42-24)
    Tool Setting
    		1 V/DIV., 10 μsec./DIV.
    Condition
    		Ignition switch on (IG)
    HINT:
    The waveform varies depending on the CAN communication signal.


    4. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  4. Using an oscilloscope, measure the waveform 3.

    Compressor and pulley operation signal
    Item
    		Content
    Symbols (Terminal No.)
    		SOL+ (E42-13) - GND (E42-24)
    Tool Setting
    		5 V/DIV., 500 μsec./DIV.
    Condition
    		Engine idling, Blower switch LO, A/C switch ON


    5. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  5. Using an oscilloscope, measure the waveform 4.

    Compressor lock sensor signal
    Item
    		Content
    Symbols (Terminal No.)
    		LOCK (E42-3) - SG-2 (E42-10)
    Tool Setting
    		500 mV/DIC., 20 msec./DIV.
    Condition
    		Ignition switch on (IG), A/C switch ON, Magnetic clutch ON