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

  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

  1. CHECK ECM (for 1KD-FTV)

  1. CHECK ECM (for 1GR-FE)

  1. CHECK ACCESSORY METER ASSEMBLY

  1. CHECK COMBINATION METER ASSEMBLY

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



CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Terminals Of Ecu

  1. Disconnect the A38 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
    A38-1 (GND) - Body ground
    		L - Body ground
    		Ground
    		Always
    		Below 1 Ω
    A38-5 (+B1) - A38-1 (GND)
    		L-Y - L
    		Battery power source
    		Always
    		11 to 14 V
    A38-6 (IG+) - A38-1 (GND)
    		R-L - L
    		IG power source
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		11 to 14 V
    A38-13 (MGC) - Body ground
    		B - Body ground
    		Magnet clutch signal
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    A38-14 (HR) - Body ground
    		L-W - Body ground
    		No. 1 heater relay signal
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    1. If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the A38 air conditioning amplifier assembly connector.

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A38-2 (BLW) - Body ground
    		L-B - Body ground
    		Blower motor speed control voltage
    1. Ignition switch ON
    2. Blower switch on (LO level)
    		Pulse generation
    (See waveform 1)
    A38-3 (AOF) - A38-1 (GND)
    		Y-B - L
    		Mode damper servo operation voltage
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Mode switch DEF
    		Below 1 V
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Mode switch FACE
    		11 to 14 V
    A38-4 (AOD) - A38-1 (GND)
    		R-B - L
    		Mode damper servo operation voltage
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Mode switch FACE
    		Below 1 V
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Mode switch DEF
    		11 to 14 V
    A38-7 (ACT) - A38-1 (GND)
    		R-L - L
    		Magnet clutch on permit input signal
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch off or on (magnet clutch off)
    		Below 1 V
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch on (magnet clutch on)
    		11 to 14 V
    A38-8 (TW) - A38-1 (GND)
    		P - L
    		Engine coolant temperature sensor signal
    		Ignition switch ON
    		Pulse generation
    A38-9 (SPD) - Body ground
    		V-W - Body ground
    		Vehicle speed signal
    		Driving at approximately 20 km/h (12 mph)
    		Pulse generation
    (See waveform 2)
    A38-13 (MGC) - Body ground
    		B - Body ground
    		Magnet clutch signal
    1. Engine idling
    2. A/C switch on (magnet clutch on permitted)
    		Below 1 V
    1. Engine idling
    2. A/C switch off or on (magnet clutch on not permitted)
    		11 to 14 V
    A38-17 (AMH) - A38-1 (GND)
    		L - L
    		Air mix damper servo operation signal
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Temperature switch MAX HOT
    		11 to 14 V
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Temperature switch MAX COLD
    		Below 1 V
    A38-18 (TAMO) - A38-1 (GND)
    		P - L
    		Ambient temperature signal
    		Ignition switch ON
    		Pulse generation
    A38-19 (AMC) - A38-1 (GND)
    		R-W - L
    		Air mix damper servo operation signal
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Temperature switch MAX HOT
    		Below 1 V
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Temperature switch MAX COLD
    		11 to 14 V
    A38-21 (AC1) - A38-1 (GND)
    		Y - L
    		Idle-up request signal
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch off
    		11 to 14 V
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch on
    		Below 1 V
    A38-22 (AIR) - A38-1 (GND)
    		L-W - L
    		Recirculation damper servo operation voltage
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Fresh switch on
    		Below 1 V
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Recirculation switch on
    		11 to 14 V
    A38-23 (AIF) - A38-1 (GND)
    		G-Y - L
    		Recirculation damper servo operation voltage
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Recirculation switch on
    		Below 1 V
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Fresh switch on
    		11 to 14 V
    A37-1 (TE) - A37-14 (SG-4)
    		G - P
    		No. 1 cooler thermistor signal
    1. Ignition switch ON
    2. Evaporator temperature 0°C (32°F)
    		2.0 to 2.4 V
    1. Ignition switch ON
    2. Evaporator temperature 15°C (59°F)
    		1.4 to 1.8 V
    A37-2 (S5-3) - A38-1 (GND)
    		W-R - L
    		Power supply for solar sensor
    		Ignition switch ON
    		4.5 to 5.5 V
    A37-5 (PSW) - A38-1 (GND)
    		Y-B - L
    		Air conditioner pressure sensor signal
    1. Engine idling
    2. Refrigerant pressure normal
    		Below 1 V
    1. Engine idling
    2. Refrigerant pressure less than 0.196 MPa (2.0 kgf/cm2, 28 psi) or more than 3.14 MPa (32.0 kgf/cm2, 455 psi)
    		11 to 14 V
    A37-7 (TS) - A37-2 (S5-3)
    		L-W - W-R
    		Solar sensor signal
    1. Ignition switch ON
    2. Solar sensor subjected to electric light
    3. Vehicle indoors
    		0.8 to 4.3 V
    1. Ignition switch ON
    2. Solar sensor covered with cloth
    3. Vehicle indoors
    		Below 0.8 V
    A37-11 (SG-2) - Body ground
    		L-Y - Body ground
    		Ground for pulse position sensor (Mode damper servo)
    		Always
    		Below 1 Ω
    A37-13 (SG-3) - Body ground
    		BR-Y - Body ground
    		Ground for cooler thermistor
    		Always
    		Below 1 Ω
    A37-14 (SG-4) - Body ground
    		P - Body ground
    		Ground for No. 1 cooler thermistor
    		Always
    		Below 1 Ω
    A37-16 (AGND) - A37-21 (AUXO)
    		R-L - LG-R
    		Input signal for pulse position sensor (recirculation damper servo)
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Air inlet control recirculation to fresh or vice versa
    		Pulse generation
    A37-17 (PIA) - A37-21 (AUXO)
    		P-B - LG-R
    		Input signal for pulse position sensor (recirculation damper servo)
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Air inlet control recirculation to fresh or vice versa
    		Pulse generation
    A37-18 (TR) - A37-13 (SG-3)
    		GR - BR-Y
    		Cooler thermistor signal
    1. Ignition switch ON
    2. Cabin temperature 25°C (77°F)
    		1.8 to 2.2 V
    1. Ignition switch ON
    2. Cabin temperature 40°C (104°F)
    		1.2 to 1.6 V
    A37-20 (SG-1) - Body ground
    		BR-Y - Body ground
    		Ground for pulse position sensor (air mix damper servo)
    		Always
    		Below 1 V
    A37-21 (AUXO) - Body ground
    		LG-R - Body ground
    		Ground for pulse position sensor (recirculation damper servo)
    		Always
    		Below 1 Ω
    A37-23 (PMB) - A37-20 (SG-1)
    		W-L - BR-Y
    		Input signal for pulse position sensor (air mix damper servo)
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Temperature switch MAX HOT to MAX COLD
    		Pulse generation
    A37-24 (PMA) - A37-20 (SG-1)
    		W-R - BR-Y
    		Input signal for pulse position sensor (air mix damper servo)
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Temperature switch MAX COLD to MAX HOT
    		Pulse generation
    A37-25 (POB) - A37-11(SG-2 )
    		LG - L-Y
    		Input signal for pulse position sensor (mode damper servo)
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Mode control FACE to DEF or vice versa
    		Pulse generation
    A37-26 (POA) - A37-11 (SG-2)
    		L-O - L-Y
    		Input signal for pulse position sensor (mode damper servo)
    1. Ignition switch ON
    2. Blower switch on (LO level)
    3. Mode control FACE to DEF or vice versa
    		Pulse generation
    1. If the result is not as specified, the air conditioning amplifier assembly may have a malfunction.


    5. Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Terminals Of Ecu

  5. Using an oscilloscope, check waveform 1.

    Blower motor control signal
    Item
    		Content
    Terminal No. (Symbol)
    		A38-2 (BLW) - Body ground
    Tool Setting
    		1 V/DIV., 50 μsec./DIV.
    Condition
    		Ignition switch ON, Blower switch on (LO level)
    HINT:
    When the blower level is increased, the duty ratio changes accordingly.


    6. Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Terminals Of Ecu

  6. Using an oscilloscope, check waveform 2.

    Vehicle speed signal
    Item
    		Content
    Terminal No. (Symbol)
    		A38-9 (SPD) - Body ground
    Tool Setting
    		5 V/DIV., 20 ms./DIV.
    Condition
    		Driving at approximately 20 km/h (12 mph)
    HINT:
    As the vehicle speed increases, the wavelength becomes shorter.

CHECK ECM (for 1KD-FTV)

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Terminals Of Ecu

  1. Measure the voltage according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    E4-2 (THWO) - E6-7 (E1)
    		P - BR
    		Engine coolant temperature output signal
    		Engine idling
    		Pulse generation
    E5-18 (AC1) - E6-7 (E1)
    		Y - BR
    		Idle-up request signal
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch on
    		Below 1 V
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch off
    		11 to 14 V
    E5-19 (ACT) - E6-7 (E1)
    		R-L - BR
    		Magnet clutch on permit output signal
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch off or on (magnet clutch on)
    		Below 1 V
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch on (magnet clutch on)
    		11 to 14 V
    If the result is not as specified, the ECM may have a malfunction.

CHECK ECM (for 1GR-FE)

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Terminals Of Ecu

  1. Measure the voltage according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    E13-14 (THWO) - E17-1 (E1)
    		P - BR
    		Engine coolant temperature output signal
    		Engine idling
    		Pulse generation
    E13-24 (AC1) - E17-1 (E1)
    		Y - BR
    		Idle-up request signal
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch on
    		Below 1 V
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch off
    		11 to 14 V
    E13-25 (ACT) - E17-1 (E1)
    		R-L - BR
    		Magnet clutch on permit output signal
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch off or on (magnet clutch on)
    		Below 1 V
    1. Engine idling
    2. Blower switch on (LO level)
    3. A/C switch on (magnet clutch on)
    		11 to 14 V
    If the result is not as specified, the ECM may have a malfunction.

CHECK ACCESSORY METER ASSEMBLY

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Terminals Of Ecu

  1. Measure the voltage according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A43-3 (TH+) - A43-2 (SG)
    		W-G - BR-Y
    		Ambient temperature sensor signal
    1. Ignition switch ON
    2. Ambient temperature 20 to 30°C (68 to 86°F)
    		1.0 to 1.6 V
    Ambient temperature sensor signal
    1. Ignition switch ON
    2. Ambient temperature 30 to 50°C (86 to 122°F)
    		0.6 to 1.0 V
    A43-9 (DATA) - A43-1 (GND1)
    		P - LG
    		Ambient temperature sensor signal
    		Ignition switch ON
    		Pulse generation
    1. If the result is not as specified, the accessory meter assembly may have a malfunction.

CHECK COMBINATION METER ASSEMBLY

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Terminals Of Ecu

  1. Measure the voltage according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    C27-6 - C27-22
    		V-R - Y
    		Vehicle speed signal
    		Driving at approximately 20 km/h (12 mph)
    		Pulse generation
    (See waveform)
    1. If the result is not as specified, the combination meter assembly may have a malfunction.


    2. Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) Terminals Of Ecu

  2. Using an oscilloscope, check waveform 1.

    Vehicle speed signal
    Item
    		Content
    Terminal No. (Symbol)
    		C27-6 - C27-22
    Tool Setting
    		5 V/DIV., 20 ms./DIV.
    Condition
    		Driving at approximately 20 km/h (12 mph)
    HINT:
    As the vehicle speed is increased. the wavelength becomes shorter.