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Terminals Of Ecu

Fig 1: Identifying ECU Terminals
G04475009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. CHECK AIR CONDITIONING AMPLIFIER 
    1. Measure the voltage and resistance of the connectors.

      HINT:

      Check from the rear of the connector while it is connected to the air conditioning amplifier.

      ECU TERMINALS VOLTAGE SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AIR (A8-22) - GND (A8-1) G - W-B Recirculation / Fresh switch signal Power switch ON (IG) Recirculation / Fresh switch: FRESH Below 1 V
      AIR (A8-22) - GND (A8-1) G - W-B Recirculation / Fresh switch signal Power switch ON (IG) Recirculation / Fresh switch: RECIRC 10 to 14 V
      AIF (A8-23) - GND (A8-1) P - W-B Recirculation / Fresh switch signal Power switch ON (IG) Recirculation / Fresh switch: RECIRC Below 1 V
      AIF (A8-23) - GND (A8-1) P - W-B Recirculation / Fresh switch signal Power switch ON (IG) Recirculation / Fresh switch: FRESH 10 to 14 V
      AOF (A8-16) - GND (A8-1) B - W-B Mode switch signal Power switch ON (IG) Mode switch: DEF Below 1 V
      AOF (A8-16) - GND (A8-1) B - W-B Mode switch signal Power switch ON (IG) Mode switch: FACE 10 to 14 V
      AOD (A8-24) - GND (A8-1) Y - W-B Mode switch signal Power switch ON (IG) Mode switch: FACE Below 1 V
      AOD (A8-24) - GND (A8-1)Y - W-B Mode switch signal Power switch ON (IG) Mode switch: DEF 10 to 14 V
      TPI (A7-19) - SGTPI (A7-4) V - L Recirculation / Fresh switch signal Power switch ON (IG) Recirculation / Fresh switch: RECIRC 4 V
      TPI (A7-19) - SGTPI (A7-4) V - L Recirculation / Fresh switch signal Power switch ON (IG) Recirculation / Fresh switch: FRESH 1 V
      TPM (A7-18) - SGTPM (A7-23) LG - P Mode switch signal Power switch ON (IG) Mode switch: FACE 4 V
      TPM (A7-18) - SGTPM (A7-23) LG - P Mode switch signal Power switch ON (IG) Mode switch: DEF 1 V
      TP (A7-20) - SGTP (A7-14) L - LG Temperature switch signal Power switch ON (IG) Temperature switch: Max. COOL 4 V
      TP (A7-20) - SGTP (A7-14) L - LG Temperature switch signal Power switch ON (IG) Temperature switch: Max. HOT 1 V
      SGTE (A7-5) - Body ground Y - Body ground Ground for evaporator temperature sensor Always Below 1 Ω
      TE (A7-7) - SGTE (A7-5) B - Y Evaporator temperature sensor signal Power switch ON (IG) Evaporator temperature: 15°C (59°F) 2 to 2.4 V
      TE (A7-7) - SGTE (A7-5) B - Y Evaporator temperature sensor signal Power switch ON (IG) Evaporator temperature: 15°C (59°F) 1.4 to 1.8 V
      S5TPI (A7-3) - SGTPI (A7-4) B - L Power supply for air inlet damper position sensor Power switch ON (IG) 4.5 to 5.5 V
      AMC (A8-19) - GND (A8-1) B - W-B Temperature switch Power switch ON (IG) Temperature switch: Max. HOT Below 1 V
      AMC (A8-19) - GND (A8-1) B - W-B Temperature switch Power switch ON (IG) Temperature switch: Max. COOL 10 to 14 V
      AMH (A8-17) - GND (A8-1) R - W-B Temperature switch Power switch ON (IG) Temperature switch: Max. COOL Below 1 V
      AMH (A8-17) - GND (A8-1) R - W-B Temperature switch Power switch ON (IG) Temperature switch: Max. HOT 10 to 14 V
      SGTPI (A7-4) - Body ground L - Body ground Ground for air inlet damper position sensor Always Below 1 Ω
      SGTPM (A7-23) - Body ground P - Body ground Ground for air outlet damper position sensor Always Below 1 Ω
      SGTP (A7-14) - Body ground LG - Body ground Ground for air mix damper position sensor Always Below 1 Ω
      S5TPM (A7-11) - SGTPM (A7-23) O - P Power supply for air outlet damper position sensor signal Power switch ON (IG) 4.5 to 5.5 V
      S5TP (A7-13) - SGTP (A7-14) P - LG Power supply for air mix damper position sensor signal Power switch ON (IG) 4.5 to 5.5 V
      IG (A8-5) - GND (A8-1) B - W-B Power switch signal Power switch control OFF 0 V
      IG (A8-5) - GND (A8-1) B - W-B Power switch signal Power switch control ON (ACC) 10 to 14 V
      +B (A8-6) - GND (A8-1) Y - W-B Back-up power source Always 10 to 14 V
      MPX+ (A8-3) - GND (A8-1) B - W-B Terminal for BEAN Engine idling after engine warmed up Pulse generation
      MPX2+ (A8-11) - GND (A8-1) GR - W-B Terminal for BEAN Engine idling after engine warmed up Pulse generation
      GND (A8-1) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      BLW (A8-2) - GND (A8-1) W - W-B Blower switch signal Power switch ON (IG) Blower switch ON (IG) Pulse generation (see ITEM AND CONTENT REFERENCE )
      S5TS (A7-12) - TS (A7-21) GR - W-B Solar sensor signal Power switch ON (IG) 0.8 to 4.3 V
      HR (A8-7) - GND (A8-1) B - W-B Blower switch signal Power switch ON (IG) Blower switch: OFF 10 to 14 V
      HR (A8-7) - GND (A8-1) B - W-B Blower switch signal Power switch ON (IG) Blower switch: ON Below 1 V
      TR (A7-8) - SGTR (A7-22) B - W Room temperature sensor signal Power switch ON (IG) Cabin temperature: 25°C (77°F) 1.8 to 2.2 V
      TR (A7-8) - SGTR (A7-22) B - W Room temperature sensor signal Power switch ON (IG) Cabin temperature: 40°C (104°F) 1.2 to 1.6 V
      SGTR (A7-22) - Body ground W - Body ground Ground for room temperature sensor Always Below 1 Ω
      ST1 (A7-2) - SGST (A7-15) BR - G Steering pad switch signal Power switch ON (IG) Steering pad switch: Fr. DEF Below 0.3 V
      ST1 (A7-2) - SGST (A7-15) BR - G Steering pad switch signal Power switch ON (IG) Steering pad switch: Rr. DEF 0.8 to 1.5 V
      ST1 (A7-2) - SGST (A7-15) BR - G Steering pad switch signal Power switch ON (IG) Steering pad switch: Recirculation/Fresh 2 to 2.9 V
      ST1 (A7-2) - SGST (A7-15) BR - G Steering pad switch signal Power switch ON (IG) Steering pad switch: OFF Above 4.6 V
      ST2 (A7-1) - SGST (A7-15) LG - G Steering pad switch signal Power switch ON (IG) Steering pad switch: AUTO Below 0.3 V
      ST2 (A7-1) - SGST (A7-15) LG - G Steering pad switch signal Power switch ON (IG) Steering pad switch: TEMP+ 0.8 to 1.5 V
      ST2 (A7-1) - SGST (A7-15) LG - G Steering pad switch signal Power switch ON (IG) Steering pad switch: TEMP- 2 to 2.9 V
      ST2 (A7-1) - SGST (A7-15) LG - G Steering pad switch signal Power switch ON (IG) Steering pad switch: OFF Above 4.6 V
      SGST (A7-15) - Body ground G - Body ground Ground for steering pad switch Always Below 1 V
      PSW (A7-6) - GND (A8-1) R - W-B Pressure switch signal Power switch ON (IG) Refrigerant pressure: Normal Below 1 V
      PSW (A7-6) - GND (A8-1) R - W-B Pressure switch signal Power switch ON (IG) Refrigerant pressure: More than 1,520 kPa (15.5 kgf/cm 2,220 psi) 10 to 14 V
      RH (A7-9) - GND (A8-1) R - W-B Humidity sensor signal Power switch ON (IG) Room humidity: 40% 2 V
      RH (A7-9) - GND (A8-1) R - W-B Humidity sensor signal Power switch ON (IG) Room humidity: 60% 2.5 V
      S5RM (A7-10) - GND (A8-1) G - W-B Power supply for humidity sensor Power switch ON (IG) 4.5 to 5.5 V
      PTC (A7-17) - GND (A8-1) P - W-B PTC heater signal Power switch ON (IG) Temperature switch: Max. HOT
      Coolant temperature:
      Below 55°C (131°F)
      Blower switch: OFF      		 Below 1 V
      PTC (A7-17) - GND (A8-1) P - W-B PTC heater signal Power switch ON (IG) Temperature switch: Max. HOT
      Coolant temperature:
      Below 55°C (131°F)
      Blower switch: LO      		 10 to 14 V
      HT-1 (A7-26) - GND (A8-1) BR - W-B PTC heater signal Power switch ON (IG) Temperature switch: Max. HOT
      Coolant temperature:
      Below 55°C (131°F)
      Blower switch: OFF      		 Below 1 V
      HT-1 (A7-26) - GND (A8-1) BR - W-B PTC heater signal Power switch ON (IG) Temperature switch: Max. HOT
      Coolant temperature:
      Below 55°C (131°F)
      Blower switch: LO      		 10 to 14 V
      HT-2 (A7-25) - GND (A8-1) L - W-B PTC heater signal Power switch ON (IG) Temperature switch: Max. HOT
      Coolant temperature:
      Below 55°C (131°F)
      Blower switch: OFF      		 Below 1 V
      HT-2 (A7-25) - GND (A8-1) L - W-B PTC heater signal Power switch ON (IG) Temperature switch: Max. HOT
      Coolant temperature:
      Below 55°C (131°F)
      Blower switch: LO      		 10 to 14 V
      IDH (A8-18) - GND (A8-1) V - W-B DC/DC converter signal Power switch ON (IG) (Voltage normal) 10 to 14 V
      IDH (A8-18) - GND (A8-1) V - W-B DC/DC converter signal Power switch ON (IG) (Over voltage) Below 1 V
    2. Using an oscilloscope, measure the waveform 1.
      ITEM AND CONTENT REFERENCE

      Item Content
      Symbols (Terminal No.) BLW (A8-2) - GND (A8-1)
      Tool Setting 2 V/DIV., 500 msec./DIV.
      Condition Power switch ON (IG), Blower switch LO

      HINT:

      When the blower level is increased, the duty ratio changes accordingly.

      Fig 2: Waveform Graph
      G04475010Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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