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Terminals Of Ecu

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  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    Fig 1: Identifying Connector Terminals Of ECU
    G05291835Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of the connectors.
      VOLTAGE AND RESISTANCE SPECIFICATION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (A10-1) - GND (A10-14) L - W-B Power source (IG) Ignition switch LOCK or ACC 0 V
      IG (A10-1) - GND (A10-14) L - W-B Power source (IG) Ignition switch ON 10 to 14 V
      BLW (A10-6) - GND (A10-14) L - W-B Blower motor speed control voltage Ignition switch ON, Blower switch OFF 10 to 14 V
      BLW (A10-6) - GND (A10-14) L - W-B Blower motor speed control voltage Ignition switch ON, Blower switch ON Pulse generation
      +B (A10-8) - GND (A10-14) W-R - W-B Power source (Back-up) Always 10 to 14 V
      ACC (A10-9) - GND (A10-14) B-O - W-B Power source (ACC) Ignition switch LOCK 0 V
      ACC (A10-9) - GND (A10-14) B-O - W-B Power source (ACC) Ignition switch ACC 10 to 14 V
      ILL+ (A10-10) - GND (A10-14) B-W - W-B Power supply for Illumination Light control switch OFF 0 V
      ILL+ (A10-10) - GND (A10-14) B-W - W-B Power supply for Illumination Light control switch Tail 10 to 14 V
      MPX+ (A10-13) - GND (A10-14) B - W-B Multiplex communication system Ignition switch ON Pulse generation
      GND (A10-14) - Body ground W-B - Body ground Ground for main power supply Always Below 1.0 Ω
      DGS (A9-4) - GND (A10-14) V - W-B Exhaust gas sensor signal After 30 seconds from ignition switch ON, Ambient temperature 10 to 35°C (50 to 95°F), Exhaust gas sensor: Exposed to exhaust gas Below 1.0 V
      DGS (A9-4) - GND (A10-14) V - W-B Exhaust gas sensor signal After 30 seconds from ignition switch ON, Ambient temperature 10 to 35°C (50 to 95°F), Exhaust gas sensor: Not exposed to exhaust gas 1.0 to 4.5 V
      TSPa (A9-5) - GND (A10-14) L - W-B Solar sensor signal (Passenger side) Ignition switch ON, Solar sensor: Covered with cloth Below 0.8 V
      TSPa (A9-5) - GND (A10-14) L - W-B Solar sensor signal (Passenger side) Ignition switch ON, Solar sensor: Exposed to electric light 0.8 to 4.3 V
      TR (A9-6) - SG-2 (A9-16) R - B-Y A/C room temperature sensor signal Ignition switch ON, Cabin temperature: 25°C (77°F) 1.8 to 2.2 V
      TR (A9-6) - SG-2 (A9-16) R - B-Y A/C room temperature sensor signal Ignition switch ON, Cabin temperature: 40°C (104°F) 1.2 to 1.6 V
      TPDr (A9-7) - SG-4 (A8-12) W - B Air mix damper position sensor signal (Driver side) Ignition switch ON, Driver temperature switch Max. WARM 0.5 to 1.5 V
      TPDr (A9-7) - SG-4 (A8-12) W - B Air mix damper position sensor signal (Driver side) Ignition switch ON, Driver temperature switch Max. COOL 3.5 to 4.5 V
      TP1 (A9-8) - SG-3 (A8-17) R - W-V Air inlet damper position sensor signal Ignition switch ON, R/F switch FRESH 1.0 V
      TP1 (A9-8) - SG-3 (A8-17) R - W-V Air inlet damper position sensor signal Ignition switch ON, R/F switch RECIRCULATION 4.0 V
      TPPa (A9-9) - SG-4 (A8-12) G - R-B Air mix damper position sensor signal (Passenger side) Ignition switch ON, Passenger temperature switch Max. WARM 0.5 to 1.5 V
      TPPa (A9-9) - SG-4 (A8-12) G - R-B Air mix damper position sensor signal (Passenger side) Ignition switch ON, Passenger temperature switch Max. COOL 3.5 to 4.5 V
      MPX- (A9-10) - GND (A10-14) R-L - W-B Multiplex communication system Ignition switch ON Pulse generation
      SG-1 (A9-13) - Body ground SB - Body ground Exhaust gas sensor ground Always Below 1.0 Ω
      TSDr (A9-14) - GND (A10-14) G - W-B Solar sensor signal (Driver side) Ignition switch ON, Solar sensor: Covered with cloth Below 0.8 V
      TSDr (A9-14) - GND (A10-14) G - W-B Solar sensor signal (Driver side) Ignition switch ON, Solar sensor: Exposed to electric light 0.8 to 4.3 V
      TE (A9-15) - SG-4 (A8-12) GR - B A/C evaporator temperature sensor signal Ignition switch ON, Evaporator temperature: 0°C (32°F) 2.1 to 2.5 V
      TE (A9-15) - SG-4 (A8-12) GR - B A/C evaporator temperature sensor signal Ignition switch ON, Evaporator temperature: 15°C (59°F) 1.6 to 2.0 V
      SG-2 (A9-16) - Body ground B-Y - Body ground Ground for A/C room temperature sensor Always Below 1.0 Ω
      TPO (A9-18) - SG-4 (A8-12) G-O - B Air outlet damper position sensor signal Ignition switch ON, Mode switch DEF 0.5 to 1.5 V
      TPO (A9-18) - SG-4 (A8-12) G-O - B Air outlet damper position sensor signal Ignition switch ON, Mode switch FACE 3.5 to 4.5 V
      S5-1 (A8-2) - SG-4 (A8-12) L - W-B Power supply for air mix damper position sensor Ignition switch ON 4.5 to 5.5 V
      S5-2 (A8-5) - SG-3 (A8-17) GR-V Power supply for air inlet damper position sensor Ignition switch ON 4.5 to 5.5 V
      FT2OP (A8-7) - GND (A10-14) W - W-B Lap-jet damper servo motor operation Start engine, Mode switch FOOT or BI-LEVEL, Metal top: Close 10 to 14 V
      FT2OP (A8-7) - GND (A10-14) W - W-B Lap-jet damper servo motor operation Start engine, Mode switch FOOT or BI-LEVEL, Metal top: Open 0 V
      AIF (A8-8) - GND (A10-14) W-L - W-B Air inlet damper servo motor operation voltage Ignition switch ON, R/F switch FRESH 10 to 14 V
      AIF (A8-8) - GND (A10-14) W-L - W-B Air inlet damper servo motor operation voltage Ignition switch ON, R/F switch RECIRCULATION Below 1.0 V
      AOF (A8-9) - GND (A10-14) G - W-B Air outlet damper servo motor operation voltage Ignition switch ON, Mode switch DEF Below 1.0 V
      AOF (A8-9) - GND (A10-14) G - W-B Air outlet damper servo motor operation voltage Ignition switch ON, Mode switch FACE 10 to 14 V
      AMHPa (A8-10) - GND (A10-14) G-B - W-B Air mix damper servo motor operation voltage (Passenger side) Ignition switch ON, Passenger temperature switch Max. COOL Below 1.0 V
      AMHPa (A8-10) - GND (A10-14) G-B - W-B Air mix damper servo motor operation voltage (Passenger side) Ignition switch ON, Passenger temperature switch WARM 10 to 14 V
      AMHDr (A8-11) - GND (A10-14) B-W - W-B Air mix damper servo motor operation voltage (Driver side) Ignition switch ON, Driver temperature switch Max. COOL Below 1.0 V
      AMHDr (A8-11) - GND (A10-14) B-W - W-B Air mix damper servo motor operation voltage (Driver side) Ignition switch ON, Driver temperature switch WARM 10 to 14 V
      SG-4 (A8-12)- Body ground B - Body ground Ground for air mix damper position sensor Always Below 1.0 Ω
      SG-3 (A8-17)- Body ground V - Body ground Ground for air inlet damper position sensor Always Below 1.0 Ω
      FT2CL (A8-18) - GND (A10-14) R - W-B Lap-jet damper servo motor operation Start engine, Mode switch FOOT or BL-LEVEL, Metal top: Open 10 to 14 V
      FT2CL (A8-18) - GND (A10-14) R - W-B Lap-jet damper servo motor operation Start engine, Mode switch FOOT or BI-LEVEL, Metal top: Close 0 V
      AIR (A8-19) - GND (A10-14) R-B - W-B Air inlet damper servo motor operation voltage Ignition switch ON, R/F switch RECIRCULATION 10 to 14 V
      AIR (A8-19) - GND (A10-14) R-B - W-B Air inlet damper servo motor operation voltage Ignition switch ON, R/F switch FRESH Below 1.0 V
      AOD (A8-20) - GND (A10-14) G-Y - W-B Air outlet damper servo motor operation voltage Ignition switch ON, Mode switch FACE Below 1.0 V
      AOD (A8-20) - GND (A10-14) G-Y - W-B Air outlet damper servo motor operation voltage Ignition switch ON, Mode switch DEF 10 to 14 V
      AMCPa (A8-21) - GND (A10-14) G-W - W-B Air mix damper servo motor operation voltage (Passenger side) Ignition switch ON, Passenger temperature switch Max. WARM Below 1.0 V
      AMCPa (A8-21) - GND (A10-14) G-W - W-B Air mix damper servo motor operation voltage (Passenger side) Ignition switch ON, Passenger temperature switch COOL 10 to 14 V
      AMCDr (A8-22) - GND (A10-14) B-O - W-B Air mix damper servo motor operation voltage (Driver side) Ignition switch ON, Driver temperature switch Max. WARM Below 1.0 V
      AMCDr (A8-22) - GND (A10-14) B-O - W-B Air mix damper servo motor operation voltage (Driver side) Ignition switch ON, Driver temperature switch COOL 10 to 14 V

      If the result is not as specified, the A/C amplifier may have a malfunction.

    2. CHECK ECM 
      Fig 2: Identifying Connector Terminals Of ECM
      G05291836Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the result is not as specified, the ECM may have a malfunction.

      1. Measure the voltage and resistance of the connectors.
      VOLTAGE AND RESISTANCE SPECIFICATION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      LCKI (E2-10) - E1 (E3-7) L-W - BR A/C lock sensor signal Engine is idling, A/C switch ON (Magnet clutch ON) Pulse generation (see  1 waveform 1)
      E1 (E3-7) - Body ground BR - Body ground Ground Always Below 1.0 Ω
      THW (E4-20) - E1 (E3-7) R-L - BR Engine coolant temperature sensor signal Engine coolant temperature 60 to 120°C (140 to 248°F) 0.2 to 1.0 V
      ACMG (E5-11) - E1 (E3-7) L-O - BR A/C magnet clutch relay signal Engine is idling, A/C switch ON (Magnet clutch ON) 0 to 1.5 V
      PR2 (E5-20) - E1 (E3-7) V - BR A/C pressure switch signal (Middle) Refrigerant pressure: Normal pressure Below 1.0 V
      PR2 (E5-20) - E1 (E3-7) V - BR A/C pressure switch signal (Middle) Refrigerant pressure: Less than 190 kPa (2.0 kgf/cm2 , 28 psi) or more than 3.14 MPa (32 kgf/cm2 , 455 psi) 10 to 14 V
      HP (E6-9) - E1 (E3-7) L-W - BR A/C pressure switch signal (High) Refrigerant pressure: Normal pressure Below 1.0 V
      HP (E6-9) - E1 (E3-7) L-W - BR A/C pressure switch signal (High) Refrigerant pressure: Abnormal pressure (more than 3.14 MPa (32 kgf/cm2 , 455 psi) 10 to 14 V
      TAM (E6-18) - E1 (E3-7) L-B - BR Ambient temperature sensor signal Ambient temperature: 25°C (77°F) 1.24 to 1.84 V
      1. Waveform 1:
        WAVEFORM REFERENCE CHART

        Item Contents
        Symbols (Terminal No.) LCKI (E2-10) - E1 (E3-7)
        Tool Setting 0.2 V/DIV., 20 msec/ DIV.
        Vehicle Condition Engine is idling, A/C switch ON
        Fig 3: Identifying Signal Waveform
        G05291837Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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