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)
    		LG - BR
    		Battery power supply
    		Always
    		11 to 14 V
    E81-1 (IG+) - E81-14 (GND)
    		G - BR
    		Ignition power supply
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    E81-14 (GND) - Body ground
    		BR - Body ground
    		Ground
    		Always
    		Below 1 Ω

  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
    E81-3 (PTC2) - Body ground*2
    		B - Body ground
    		Quick heater assembly operation signal
    1. Engine idling
    2. Set temperature: MAX HOT (HI)
    3. Engine coolant temperature: Below 65°C (149°F)
    4. Ambient temperature: Below 10°C (50°F)
    5. Blower switch: off → on (after 30 seconds)
    		11 to 14 V → Below 1 V
    E81-4 (SW 1) - Body ground*1
    		P - Body ground
    		Idle up switch operation signal
    1. Engine running
    2. A/C switch on
    3. Blower switch on (LO level)
    4. Idle up switch off → on
    		Below 1 V 14 V
    E81-5 (TAM) - E81-13 (SG-2)
    		V - G
    		Ambient temperature sensor signal
    1. Ignition switch ON
    2. Ambient temperature: 25°C (77°F)
    		1.4 to 1.6 V
    1. Ignition switch ON
    2. Ambient temperature: 50°C (122°F)
    		0.7 to 0.9 V
    E81-8 (LOCK) - E81-13 (SG-2)
    		L - G
    		Compressor lock sensor signal
    1. Engine idling
    2. A/C switch on (magnet clutch on)
    3. Blower switch: LO
    		Pulse generation
    (see waveform 1)
    E81-9 (PRE) - E81-13 (SG-2)
    		R - G
    		Air conditioning pressure sensor signal
    1. Ignition switch ON
    2. A/C switch off
    		0.63 to 4.78 V
    1. Engine idling
    2. A/C switch on
    3. Blower switch LO
    4. Refrigerant pressure is normal
    		0.63 to 4.78 V
    Refrigerant pressure: Abnormal (less than 177 kPa [1.8 kgf/cm2, 26 psi])
    		Below 0.63 V
    Refrigerant pressure: Abnormal (more than 3079 kPa [31.4 kgf/cm2, 446 psi])
    		4.78 V or higher
    E81-13 (SG-2) - Body ground
    		G - Body ground
    		Ground for pressure sensor, cooler compressor
    		Always
    		Below 1 Ω
    E81-17 (MGCA) - Body ground*1
    		P - Body ground
    		Viscous with magnet clutch operation signal
    1. Engine idling
    2. Idle up switch on
    		Below 1 V
    E81-20 (MGC) - E81-14 (GND)
    		R - BR
    		Magnet clutch operation signal
    1. Engine idling
    2. Blower switch: LO
    3. A/C switch on (magnet clutch on)
    		Below 1 V
    1. Engine idling
    2. Blower switch: LO
    3. A/C switch on or off (magnet clutch off)
    		11 to 14 V
    E81-22 (BLW) - E81-14 (GND)
    		R - BR
    		Blower motor control signal
    1. Ignition switch ON
    2. Blower switch: LO
    		Pulse generation
    (see waveform 2)
    1. Ignition switch ON
    2. Blower switch: off
    		4.5 to 5.5 V
    E81-23 (AC1) - Body ground
    		L - Body ground
    		Compressor operation signal
    1. Engine idling
    2. Blower switch LO
    3. A/C switch off
    		11 to 14 V
    1. Engine idling
    2. Blower switch LO
    3. A/C switch on
    		Below 1 V
    E81-24 (COOL) - Body ground*4
    		W - Body ground
    		Cool box operation signal
    1. Ignition switch ON
    2. Cool box switch on
    		Below 1 V
    1. Ignition switch ON
    2. Cool box switch off
    		11 to 14 V
    E81-25 (ALT) - Body ground
    		R - Body ground
    		Generator assembly signal
    		Ignition switch ON
    		Pulse generation
    E81-27 (ACT) - Body ground
    		G - Body ground
    		Compressor operation signal
    1. Engine idling
    2. A/C switch off or on (magnet clutch off)
    		Below 1 V
    1. Engine idling
    2. A/C switch on (magnet clutch on)
    		11 to 14 V
    E81-30 (S5-3) - E81-13 (SG-2)
    		LG - G
    		Power supply for air conditioner pressure
    		Ignition switch ON
    		4.75 to 5.25 V
    E81-36 (PTC3) - Body ground*2
    		R - Body ground
    		Quick heater assembly operation signal
    1. Engine idling
    2. Set temperature: MAX HOT (HI)
    3. Engine coolant temperature: Below 65°C (149°F)
    4. Ambient temperature: Below 10°C (50°F)
    5. Blower switch: off → on (after 20 seconds)
    		11 to 14 V → Below 1 V
    E81-40 (PTC1) - Body ground*2
    		W - Body ground
    		Quick heater assembly operation signal
    1. Engine idling
    2. Set temperature: MAX HOT (HI)
    3. Engine coolant temperature: Below 65°C (149°F)
    4. Ambient temperature: Below 10°C (50°F)
    5. Blower switch: off → on (after 10 seconds)
    		11 to 14 V → Below 1 V
    z71-2 (BUS G) - Body ground
    		-
    		Ground for BUS IC
    		Always
    		Below 1 Ω
    z71-3 (BUS) - z71-2 (BUS G)
    		-
    		BUS IC control signal
    		Ignition switch ON
    		Pulse generation
    z71-4 (B BUS) - z71-2 (BUS G)
    		-
    		Power supply for BUS IC
    		Always
    		11 to 14 V
    z71-5(SG) - Body ground
    		-
    		Ground for evaporator temperature sensor
    		Always
    		Below 1 Ω
    z71-5 (SG) - z71-6 (TE)
    		-
    		Evaporator temperature sensor signal
    1. Ignition switch ON
    2. Evaporator temperature: 15°C (59°F)
    		1.0 to 1.2 V
    1. *1: w/ Viscous Heater
    2. *2: w/ PTC Heater


    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) - E81-13 (SG-2)
    Tool Setting
    		200 mV/DIV., 10 ms/DIV.
    Condition
    1. Engine idling
    2. Blower switch: LO
    3. A/C switch: 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)
    		E81-22 (BLW) - E81-14 (GND)
    Tool Setting
    		1 V/DIV., 500 μs/DIV.
    Condition
    1. Ignition switch ON
    2. Blower switch: LO
    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)
    		B - 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