AIR CONDITIONING SYSTEM TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER (1KD-FTV, 2KD-FTV, 2TR-FE)

    A01BG8BE01
    Symbols (Terminal No.) Wiring Color Tester Description Condition Specification
    PTC (H18-2) - GND (H18-29) LG - W-B PTC heater control signal

    Ignition switch: ON

    Temperature switch: Max. HOT

    Coolant temperature: Below 76°C (169°F)

    Ambient temperature: Below 10°C (50°F)

    PTC heater: Not operate → Operate (ALT, F-DUTY more than 95 %)

    		 Below 1.0 V → 10 to 14 V
    PTCL (H18-3) - GND (H18-29) GR - W-B PTC heater permission signal

    Ignition switch: ON

    Temperature switch: Max. HOT

    Coolant temperature: Below 73°C (163°F)

    Ambient temperature: Below 10°C (50°F)

    PTC heater: Not operate → Operate (ALT, F-DUTY more than 95 %)

    		 Below 1.0 V → 10 to 14 V
    PHTR (H18-5) - GND (H18-29) L-W - W-B Idle-up switch signal

    Ignition switch: ON

    Idle-up switch: OFF → ON

    		 Below 1.0 V → 10 to 14 V
    A.C (H18-8) - GND (H18-29) Y - W-B A/C switch signal

    Ignition switch: ON

    Blower switch: ON

    A/C switch: OFF → ON

    		 Below 1.0 V → 10 to 14 V
    LED+ (H18-9) - GND (H18-29) G-B - W-B A/C switch indicator signal

    Ignition switch: ON

    Blower switch: ON

    A/C switch: OFF → ON

    		 Below 1.0 V → 10 to 14 V
    BLW (H18-16) - GND (H18-29) L - W-B Blower motor control signal

    Ignition switch: ON

    Blower switch: OFF → ON

    		 10 to 14 V → Below 1.0 V
    GND (H18-29) - Body ground W-B - Body ground Ground for main power supply Always Below 1.0 Ω
    PRE (H18-4) - GND (H18-29) R-L - W-B A/C pressure sensor signal

    Start engine

    Operate A/C system

    Refrigerant pressure: Abnormal pressure (More than 3,030 kPa (31.0 kgf/cm, 440 psi))

    		 4.7 V or higher
    PRE (H18-4) - GND (H18-29) R-L - W-B A/C pressure sensor signal

    Start engine

    Operate A/C system

    Refrigerant pressure: Abnormal pressure (less than 180 kPa (1.9 kgf/cm, 27 psi))

    		 Below 0.7 V
    PRE (H18-4) - GND (H18-29) R-L - W-B A/C pressure sensor signal

    Start engine

    Operate A/C system

    Refrigerant pressure: Normal pressure (less than 3,030 kPa (31.0 kgf/cm, 440 psi) and more than 180 kPa (1.9 kgf/cm, 27 psi))

    		 0.7 to 4.7 V
    S5 (H18-13) - SG-1 (H13-12) Y-R - L-W Power supply for pressure sensor Ignition switch: LOCK → ON Below 1.0 V → 5.15 V
    TAM (H18-25) - SG-1 (H13-12) G-W - L-W A/C ambient temperature sensor signal Ignition switch: LOCK → ON

    Click here

    SG-1 (H18-12) - Body ground L-W - Body ground Ground for each sensor Always Below 1.0 Ω
    TE (H18-24) - SG (H18-31) W - L-B A/C evaporator temperature sensor signal Ignition switch: LOCK → ON

    Click here

    SG (H18-31) - Body ground L-B - Body ground Ground for each sensor Always Below 1.0 Ω
    FRBV (H18-22) - SG (H18-31) L-R - LG-B Room compartment temperature set signal Max. HOT → Max. COOL 0 Ω → 3 kΩ
    MHSW (H18-38) - Body ground B-W - Body ground Max. hot switch signal Except max. HOT → Max. HOT Below 1.0 V → 10 to 14 V
    CANH (H18-10) - Body ground L - Body ground CAN communication system Ignition switch: LOCK → ON Pulse generation
    CANH (H18-11) - Body ground W - Body ground CAN communication system Ignition switch: LOCK → ON Pulse generation
    RRTE (H18-23) - SG-2 (H18-30) W-R - L-B Rear A/C evaporator temperature sensor signal Ignition switch: LOCK → ON

    Click here

    SG-2 (H18-30) - Body ground L-B - Body ground Ground for rear A/C evaporator temperature sensor Always Below 1.0 Ω
    RRAC (H18-7) - Body ground P - Body ground Rear A/C switch signal

    Ignition switch: ON

    A/C switch: OFF → ON

    		 Below 1.0 V → 10 to 14 V
    RMGV (H18-18) - Body ground R-Y - Body ground Rear magnetic valve signal

    Ignition switch: ON

    Rear magnetic valve: OFF → ON

    		 10 to 14 V → Below 1.0 V
    LOCK (H18-28) - SG (H18-31) L - L-B Compressor lock sensor signal

    Engine idling

    A/C switch: ON (Magnet clutch: ON)

    Pulse generation

    (see waveform 1)
    MGC (H18-19) - Body ground R - Body ground Magnet clutch ON permission signal

    Ignition switch: ON

    A/C switch: OFF → ON

    		 10 to 14 V → Below 1.0 V
    IG+ (H18-20) - Body ground R-B - Body ground Power source (IG) Ignition switch: LOCK or ACC → ON Below 1.0 V → 10 to 14 V
    B (H18-40) - Body ground W-R - Body ground Power source (Back-up) Always 10 to 14 V

  2. CHECK AIR CONDITIONING AMPLIFIER (5L-E)

    A01BA9SE01
    Symbols (Terminal No.) Wiring Color Tester Description Condition Specification
    AC1 (H19-8) - Body ground R-B - Body ground Compressor operation signal

    Ignition switch: ON

    A/C switch: OFF → ON

    		 3.7 to 4.5 V → 1.3 to 2.6 V
    ACT (H19-10) - Body ground G-W - Body ground Compressor permission signal

    Ignition switch: ON

    A/C switch: OFF → ON

    		 Below 1.0 V → 10 to 14 V
    A.C (H19-11) - GND (H19-6) Y - W-B A/C switch signal

    Ignition switch: ON

    A/C switch: OFF → ON

    		 Below 1.0 V → 10 to 14 V
    GND (H19-6) - Body ground W-B - Body ground Ground for main power supply Always Below 1.0 Ω
    PRE (H19-3) - Body ground R-L - Body ground A/C pressure switch signal

    Start engine

    Operate A/C system

    Refrigerant pressure: Normally → Less than 0.19 MPa (2.0 kgf/cm, 28 psi) or more than 1.34 MPa (13.7 kgf/cm, 195 psi))

    		 Below 1 V → 10 to 14 V
    TE (H19-4) - SG (H19-16) W - L-B A/C evaporator temperature sensor signal Ignition switch: LOCK → ON

    Click here

    SG (H19-16) - Body ground L-B - Body ground Ground for each sensor Always Below 1.0 Ω
    FRBV (H19-12) - SG (H19-16) B - L-B Room compartment temperature set signal Max. HOT → Max. COOL 0 Ω → 3 Ω
    RRTE (H19-7) - SG (H19-16) W-R - L-B Rear A/C evaporator temperature sensor signal Ignition switch: LOCK → ON

    Click here

    RRAC (H19-18) - Body ground Y - Body ground Rear A/C switch signal

    Ignition switch: ON

    A/C switch: OFF → ON

    		 Below 1.0 V → 10 to 14 V
    RMGV (H19-9) - Body ground R-Y - Body ground Rear magnetic valve signal

    Ignition switch: ON

    Rear magnetic valve: OFF → ON

    		 Below 1.0 V → 10 to 14 V
    MGC (H19-15) - Body ground R - Body ground Magnet clutch ON permission signal

    Ignition switch: ON

    A/C switch: OFF → ON

    		 Below 1.0 V → 10 to 14 V
    IG+ (H19-13) - Body ground R-B - Body ground Power source (IG) Ignition switch: LOCK or ACC → ON Below 1.0 V → 10 to 14 V

    1. A01BCT8E02

      Waveform 1:

      Measure the waveform between terminal LOCK of the A/C amplifier assembly connector and body ground.