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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    AIR (A16-22) - GND (A16-1)
    		L-W - L
    		Air inlet damper servo motor operation voltage
    		Ignition switch ON
    Fresh switch ON
    		Below 1 V
    AIR (A16-22) - GND (A16-1)
    		L-W - L
    		Air inlet damper servo motor operation voltage
    		Ignition switch ON
    Recirculation switch ON
    		11 to 14 V
    AIF (A16-23) - GND (A16-1)
    		G-Y - L
    		Air inlet damper servo motor operation voltage
    		Ignition switch ON
    Recirculation switch ON
    		Below 1 V
    AIF (A16-23) - GND (A16-1)
    		G-Y - L
    		Air inlet damper servo motor operation voltage
    		Ignition switch ON
    Fresh switch ON
    		11 to 14 V
    AOF (A16-3) - GND (A16-1)
    		Y-B - L
    		Air vent mode damper servo motor operation voltage
    		Ignition switch ON
    Mode switch DEF
    		Below 1 V
    AOF (A16-3) - GND (A16-1)
    		Y-B - L
    		Air vent mode damper servo motor operation voltage
    		Ignition switch ON
    Mode switch FACE
    		11 to 14 V
    AOD (A16-4) - GND (A16-1)
    		R-B - L
    		Air vent mode damper servo motor operation voltage
    		Ignition switch ON
    Mode switch FACE
    		Below 1 V
    AOD (A16-4) - GND (A16-1)
    		R-B - L
    		Air vent mode damper servo motor operation voltage
    		Ignition switch ON
    Mode switch DEF
    		11 to 14 V
    PIA (A15-17) - SG-7 (A15-21)
    		P-B - LG-R
    		Input signal for pulse position sensor (Air inlet damper servo motor)
    		Ignition switch ON
    Air inlet control:
    Changed from RECIRCULATION to FRESH or vice versa
    		Pulse generation
    PIB (A15-16) - SG-7 (A15-21)
    		R-L - LG-R
    		Input signal for pulse position sensor (Air inlet damper servo motor)
    		Ignition switch ON
    Air inlet control:
    Changed from RECIRCULATION to FRESH or vice versa
    		Pulse generation
    SG-7 (A15-21) - Body ground
    		LG-R - Body ground
    		Ground for pulse position sensor (Air inlet damper servo motor)
    		Always
    		Below 1 Ω
    POA (A15-26) - SG-2 (A15-11)
    		L-O - L-Y
    		Input signal for pulse position sensor (Air vent mode damper servo motor)
    		Ignition switch ON
    Mode control:
    Changed from FACE to DEF or vice versa
    		Pulse generation
    POB (A15-25) - SG-2 (A15-11)
    		LG - L-Y
    		Input signal for pulse position sensor (Air vent mode damper servo motor)
    		Ignition switch ON
    Mode control:
    Changed from FACE to DEF or vice versa
    		Pulse generation
    SG-2 (A15-11) - Body ground
    		L-Y - Body ground
    		Ground for pulse position sensor (Air vent mode damper servo motor)
    		Always
    		Below 1 Ω
    TE (A15-1) - SG-4 (A15-14)
    		G - P
    		A/C evaporator temperature sensor signal
    		Ignition switch ON
    Evaporator temperature:
    0°C (32°F)
    		2 to 2.4 V
    TE (A15-1) - SG-4 (A15-14)
    		G - P
    		A/C evaporator temperature sensor signal
    		Ignition switch ON
    Evaporator temperature:
    15°C (59°F)
    		1.4 to 1.8 V
    SG-4 (A15-14) - Body ground
    		P - Body ground
    		Ground for A/C evaporator temperature sensor
    		Always
    		Below 1 Ω
    IG+ (A16-6) - GND (A16-1)
    		R-L - L
    		Power source (IG)
    		Ignition switch off or ACC
    		Below 1 V
    IG+ (A16-6) - GND (A16-1)
    		R-L - L
    		Power source (IG)
    		Ignition switch ON
    		11 to 14 V
    +B1 (A16-5) - GND (A16-1)
    		L-Y - L
    		Power source (Back-up)
    		Always
    		11 to 14 V
    GND (A16-1) - Body ground
    		L - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    BLW (A16-2) - GND (A16-1)
    		L-B - L
    		Blower motor speed control voltage
    		Ignition switch ON
    Blower switch ON (LO)
    		Pulse generation
    (see waveform 1)
    TS (A15-7) - S5-3 (A15-2)
    		L-W - W-R
    		A/C solar sensor signal
    		Ignition switch ON
    		0.8 to 4.3 V
    S5-3 (A15-2) - GND (A16-1)
    		W-R - L
    		Power supply for solar sensor
    		Ignition switch ON
    		4.5 to 5.5 V
    HR (A16-14) - GND (A16-1)
    		L-W - L
    		HTR relay signal
    		Ignition switch ON
    Blower switch OFF
    		11 to 14 V
    HR (A16-14) - GND (A16-1)
    		L-W - L
    		HTR relay signal
    		Ignition switch ON
    Blower switch ON
    		Below 1 V
    TR (A15-18) - SG-3 (A15-13)
    		GR - BR-Y
    		A/C room temperature sensor signal
    		Ignition switch ON
    Cabin temperature:
    25°C (77°F)
    		1.8 to 2.2 V
    TR (A15-18) - SG-3 (A15-13)
    		GR - BR-Y
    		A/C room temperature sensor signal
    		Ignition switch ON
    Cabin temperature:
    40°C (104°F)
    		1.2 to 1.6 V
    SG-3 (A15-13) - Body ground
    		BR-Y - Body ground
    		Ground for A/C room temperature sensor
    		Always
    		Below 1 Ω
    RDFG (A16-12) - GND (A16-1)
    		R-L - L
    		Rear defogger switch signal
    		Ignition switch ON
    Rear defogger switch OFF
    		11 to 14 V
    RDFG (A16-12) - GND (A16-1)
    		R-L - L
    		Rear defogger switch signal
    		Ignition switch ON
    Rear defogger switch ON
    		Below 1 V
    ACT (A16-7) - GND (A16-1)
    		R-L - L
    		Magnet clutch on permit input signal
    		Ignition switch START
    Magnet clutch ON: Not permitted
    		Below 1 V
    ACT (A16-7) - GND (A16-1)
    		R-L - L
    		Magnet clutch on permit input signal
    		Ignition switch START
    Magnet clutch ON: Permitted
    		11 to 14 V
    AC1 (A16-21) - GND (A16-1)
    		Y - L
    		Idle-up request signal
    		Ignition switch START
    Magnet clutch: Not engaged
    		11 to 14 V
    AC1 (A16-21) - GND (A16-1)
    		Y - L
    		Idle-up request signal
    		Ignition switch START
    Magnet clutch: Engaged
    		Below 1 V
    SPD (A16-9) - GND (A16-1)
    		V-W - L
    		Vehicle speed signal
    		Driving at approx. 20 km/h (12 mph)
    		Pulse generation
    (see waveform 2)
    PSW (A15-5) - GND (A16-1)
    		Y-B - L
    		Pressure switch signal
    		Ignition switch START
    Refrigerant pressure: Normal
    		Below 1 V
    PSW (A15-5) - GND (A16-1)
    		Y-B - L
    		Pressure switch signal
    		Ignition switch START
    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
    TAMO (A16-18) - GND (A16-1)
    		P - L
    		A/C ambient temperature signal
    		Ignition switch ON
    		Pulse generation
    MGC (A16-13) - GND (A16-1)
    		B - L
    		Magnet clutch signal
    		Ignition switch START
    Magnet clutch: Not engaged
    		11 to 14 V
    MGC (A16-13) - GND (A16-1)
    		B - L
    		Magnet clutch signal
    		Ignition switch START
    Magnet clutch: Engaged
    		Below 1 V
    SW1 (A16-16) - GND (A16-1)
    		G-O - L
    		Hazard warning switch signal
    		Hazard warning switch signal OFF
    		11 to 14 V
    SW1 (A16-16) - GND (A16-1)
    		G-O - L
    		Hazard warning switch signal
    		Hazard warning switch signal ON
    		Below 1 V
    ILL+ (A16-15) - GND (A16-1)
    		G - L
    		Power supply for illumination
    		Light control switch OFF
    		Below 1 V
    ILL+ (A16-15) - GND (A16-1)
    		G - L
    		Power supply for illumination
    		Light control switch TAIL
    		11 to 14 V
    AMC (A16-19) - GND (A16-1)
    		R-W - L
    		Air mix damper servo motor operation signal
    		Ignition switch ON
    Temperature switch Max. HOT
    		Below 1 V
    AMC (A16-19) - GND (A16-1)
    		R-W - L
    		Air mix damper servo motor operation signal
    		Ignition switch ON
    Temperature switch Max. COOL
    		11 to 14 V
    AMH (A16-17) - GND (A16-1)
    		L - L
    		Air mix damper servo motor operation signal
    		Ignition switch ON
    Temperature switch Max. HOT
    		11 to 14 V
    AMH (A16-17) - GND (A16-1)
    		L - L
    		Air mix damper servo motor operation signal
    		Ignition switch ON
    Temperature switch Max. COOL
    		Below 1 V
    PMA (A15-24) - SG-1 (A15-20)
    		W-R - BR-Y
    		Input signal for pulse position sensor (Air mix damper servo motor)
    		Ignition switch ON
    Temperature switch: Max. COOL → Max. HOT
    		Pulse generation
    PMB (A15-23) - SG-1 (A15-20)
    		W-L - BR-Y
    		Input signal for pulse position sensor (Air mix damper servo motor)
    		Ignition switch ON
    Temperature switch: Max. HOT → Max. COOL
    		Pulse generation
    SG-1 (A15-20) - Body ground
    		BR-Y - Body ground
    		Ground for pulse position sensor (Air mix damper servo motor)
    		Always
    		Below 1 V
    TW (A16-8) - GND (A16-1)
    		P - L
    		Engine coolant temperature sensor signal
    		Ignition switch ON
    		Pulse generation
    1. If the result is not as specified, the air conditioning amplifier 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.

    Blower motor control signal
    Item
    		Content
    Symbols (Terminal No.)
    		BLW (A16-2) - GND (A16-1)
    Tool Setting
    		1 V/DIV., 50 μsec./DIV.
    Condition
    		Ignition switch ON, Blower switch ON (LO)
    HINT:
    When the blower level is increased, the duty ratio changes accordingly.


    3. 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

  3. Using an oscilloscope, check waveform 2.

    Vehicle speed signal
    Item
    		Content
    Symbols (Terminal No.)
    		SPD (A16-9) - GND (A16-1)
    Tool Setting
    		5 V/DIV., 20 msec./DIV.
    Condition
    		Driving at approx. 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.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    ACT (E5-19) - E1 (E6-7)
    		R-L - BR
    		Magnet clutch on permit output signal
    		Ignition switch START
    Magnet clutch ON:
    Not permitted
    		Below 1 V
    ACT (E5-19) - E1 (E6-7)
    		R-L - BR
    		Magnet clutch on permit output signal
    		Ignition switch START
    Magnet clutch ON:
    Permitted
    		11 to 14 V
    AC1 (E5-18) - E1 (E6-7)
    		Y - BR
    		Idle-up request signal
    		Ignition switch START
    Magnet clutch:
    Engaged
    		Below 1 V
    AC1 (E5-18) - E1 (E6-7)
    		Y - BR
    		Idle-up request signal
    		Ignition switch START
    Magnet clutch:
    Not engaged
    		11 to 14 V
    THW (E7-19) - E2 (E7-28)
    		R-L - BR
    		Engine coolant temperature sensor signal
    		Ignition switch START
    Engine coolant temperature 20°C (68°F)
    		0.2 to 1.0 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.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    ACT (E13-25) - E1 (E17-1)
    		R-L - BR
    		Magnet clutch on permit output signal
    		Ignition switch ON
    Magnet clutch ON:
    Not permitted
    		Below 1 V
    ACT (E13-25) - E1 (E17-1)
    		R-L - BR
    		Magnet clutch on permit output signal
    		Ignition switch ON
    Magnet clutch ON:
    Permitted
    		11 to 14 V
    AC1 (E13-24) - E1 (E17-1)
    		Y - BR
    		Idle-up request signal
    		Ignition switch ON
    Magnet clutch:
    Engaged
    		Below 1 V
    AC1 (E13-24) - E1 (E17-1)
    		Y - BR
    		Idle-up request signal
    		Ignition switch ON
    Magnet clutch:
    Not engaged
    		11 to 14 V
    THW (E15-21) - E2 (E15-28)
    		B - BR
    		Engine coolant temperature sensor signal
    		Ignition switch START
    Engine coolant temperature 20°C (68°F)
    		0.2 to 1.0 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.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    TH+ (A23-3) - SG (A23-2)
    		W-G - BR-Y
    		A/C ambient temperature sensor signal
    		Ignition switch ON
    Ambient temperature:
    20 to 30°C (68 to 86°F)
    		1 to 1.6 V
    TH+ (A23-3) - SG (A23-2)
    		W-G - BR-Y
    		A/C ambient temperature sensor signal
    		Ignition switch ON
    Ambient temperature:
    30 to 50°C (86 to 122°F)
    		0.6 to 1 V
    DATA (A23-9) - GND1 (A23-1)
    		P - LG
    		A/C 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.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    C10-6 - C10-22
    		V-R - Y
    		Vehicle speed signal
    		Driving at approx. 20 km/h (12 mph)
    		Pulse generation
    1. If the result is not as specified, the combination meter assembly may have a malfunction.