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

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

  1. CHECK AIR CONDITIONING CONTROL ASSEMBLY

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



CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  1. Disconnect the E81 air conditioning amplifier assembly connector.

  2. Measure the voltage and resistance according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    E81-21 (+B1) - E81-14 (GND)
    		R - W-B
    		Battery power source
    		Always
    		11 to 14 V
    E81-1 (IG+) - E81-14 (GND)
    		G - W-B
    		Ignition power supply
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    E81-14 (GND) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    1. If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the E81 air conditioning amplifier assembly connector.

  4. 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
    E81-8 (LOCK) - E81-35 (SG-5)
    		L - G
    		Compressor lock sensor signal
    		Engine idling
    Blower switch LO level
    A/C switch on (magnet clutch on)
    		Pulse generation
    (see waveform 1)
    E81-35 (SG-5) - Body ground
    		G - Body ground
    		Ground for compressor lock sensor signal
    		Always
    		Below 1 Ω
    E81-13 (SG-2) - Body ground
    		G - Body ground
    		Ground for pressure sensor
    		Always
    		Below 1 Ω
    E81-17 (AC1) - Body ground
    		L - Body ground
    		Air conditioning operation request signal
    		Engine idling
    Blower switch LO level
    A/C switch off
    		11 to 14 V
    Engine idling
    Blower switch LO level
    A/C switch on
    		Below 1 V
    E81-27 (ACT) - Body ground
    		G - Body ground
    		Magnet clutch operation permission signal
    		Engine idling
    Blower switch LO level
    A/C switch off or A/C switch on (magnet clutch off)
    		11 to 14 V
    Engine idling
    Blower switch LO level
    A/C switch on (magnet clutch on)
    		Below 1 V
    E81-5 (TAM) - E81-13 (SG-2)
    		V - G
    		Ambient temperature sensor signal
    		Ignition switch ON
    Ambient temperature 25°C (77°F)
    		1.6 to 1.8 V
    Ignition switch ON
    Ambient temperature 50°C (122°F)
    		0.5 to 0.7 V
    E81-30 (S5-1) - E81-13 (SG-2)
    		LG - G
    		Power supply for pressure sensor
    		Ignition switch ON
    		4.5 to 5.5 V
    E81-9 (PRE) - E81-13 (SG-2)
    		R - G
    		Air conditioning pressure sensor signal
    		Engine idling
    Blower switch LO level
    A/C switch on
    		0.63 to 4.72 V
    Engine idling
    Blower switch LO level
    A/C switch off
    		0.63 to 4.72 V
    E81-20 (MGC) - E81-14 (GND)
    		R - W-B
    		Magnet clutch operation signal
    		Engine idling
    Blower switch LO level
    A/C switch on (magnet clutch on permitted)
    		Below 1 V
    Engine idling
    Blower switch LO level
    A/C switch off or on (magnet clutch on not permitted)
    		11 to 14 V
    E81-23 (BLW) - E81-14 (GND)
    		R - W-B
    		Blower motor control signal
    		Ignition switch ON
    Blower switch LO level
    		Pulse generation
    (see waveform 2)
    E81-37 (LIN1) - E81-14 (GND)
    		Y - W-B
    		LIN communication signal
    		Ignition switch ON
    		Pulse generation
    E81-25 (ALT) - Body ground
    		R - Body ground
    		Generator signal
    		Engine idling
    		Pulse generation
    E81-3 (PTC1) - Body ground*
    		W - Body ground
    		PTC heater relay operation signal
    		Engine idling
    Set temperature MAX. HOT
    Engine coolant temperature below 65°C (149°F)
    Ambient temperature below 10°C (50°F)
    Blower switch off → LO level
    		Below 1 V → 11 to 14 V
    E81-22 (PTC2) - Body ground*
    		R - Body ground
    E81-4 (PTC3) - Body ground*
    		R - Body ground
    z54-4 (B BUS) - z54-2 (BUS G)
    		-
    		Power supply for BUS IC
    		Ignition switch ON
    		11 to 14 V
    z54-5 (SGA) - Body ground
    		-
    		Ground for No. 1 cooler thermistor
    		Always
    		Below 1 Ω
    z54-2 (BUS G) - Body ground
    		-
    		Ground for BUS IC
    		Always
    		Below 1 Ω
    z54-6 (TEA) - z54-5 (SGA)
    		-
    		No. 1 cooler thermistor signal
    		Ignition switch ON
    Evaporator temperature 15°C (59°F)
    		1.4 to 1.8 V
    z54-3 (BUS) - z54-2 (BUS G)
    		-
    		BUS IC control signal
    		Ignition switch ON
    		Pulse generation
    1. *: w/ PTC Heater
    1. If the result is not as specified, the air conditioning amplifier assembly may have a malfunction.


    5. Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating 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, check waveform 1.

    Compressor Lock Sensor Signal
    Item
    		Content
    Terminal No. (Symbol)
    		E81-8 (LOCK) - E81-35 (SG-5)
    Tool Setting
    		200 mV/DIV., 10 ms/DIV.
    Condition
    		Engine idling
    Blower switch LO level
    A/C switch on (magnet clutch on)
    HINT:
    When the rear blower level is increased, the duty ratio changes accordingly.


    6. Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  6. Using an oscilloscope, check waveform 2.

    Blower Motor Control Signal
    Item
    		Content
    Terminal No. (Symbol)
    		E81-23 (BLW) - E81-14 (GND)
    Tool Setting
    		1 V/DIV., 500 μs/DIV.
    Condition
    		Ignition switch ON
    Blower switch LO level
    HINT:
    When the blower level is increased, the duty ratio changes accordingly.

CHECK AIR CONDITIONING CONTROL ASSEMBLY

Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Manual Air Conditioning System) Terminals Of Ecu

  1. Disconnect the F10 air conditioning control assembly connector.

  2. Measure the resistance and voltage according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    F10-7 (IG+) - F10-1 (GND)
    		G - W-B
    		Ignition power supply
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    F10-1 (GND) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    1. If the result is not as specified, there may be a malfunction on the wire harness side.