STOP AND START SYSTEM TERMINALS OF ECU


  1. ENGINE STOP AND START ECU

    A01IOBFE13

    1. Disconnect the A73, A74 and H121 engine stop and start ECU connector.

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

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      A73-5 (+B) - Body ground G - Body ground Power source of engine stop and start ECU Ignition switch ON 9.5 to 14 V
      A73-7 (BIN) - Body ground L - Body ground Battery Always 9.5 to 14 V
      A73-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A74-10 (NE) - Body ground P - Body ground Engine speed signal from ECM Always 10 kΩ or higher
      A74-17 (VB-) - Body ground W-B - Body ground Ground Always Below 1 Ω
      H121-15 (CANH) - Body ground P - Body ground CAN communication Always 200 Ω or higher
      H121-16 (CANL) - Body ground W - Body ground CAN communication Always 200 Ω or higher
      H121-17 (IG1) - Body ground L - Body ground Ignition switch signal Ignition switch ON 9.5 to 14 V
      H121-19 (ACC) - Body ground GR - Body ground Ignition switch signal Ignition switch ACC 9.5 to 14 V
      H121-20 (IG2) - Body ground P - Body ground Ignition switch signal Ignition switch ON 9.5 to 14 V

    3. Reconnect the A73, A74 and H121 engine stop and start ECU connector.

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

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      A74-3 (BRE2) - Body ground G - Body ground Ground (vacuum sensor assembly (brake booster pressure sensor)) Always Below 1 Ω
      A74-7 (BNT1) - A73-8 (GND) R - W-B Engine hood courtesy switch (hood lock assembly) signal

      • Ignition switch ON

      • Engine stopped

      • Engine hood closed

      		 0 to 1.5 V

      • Ignition switch ON

      • Engine stopped

      • Engine hood open

      		 8 to 14 V
      A74-10 (NE) - A73-8 (GND) P - W-B Engine speed signal from ECM Idling after engine warmed up Pulse generation (see waveform 1)
      A74-11 (CLU) - A73-8 (GND) W - W-B Clutch switch assembly (for upper) signal

      • Ignition switch ON

      • Clutch pedal released

      		 8 to 14 V

      • Ignition switch ON

      • Clutch pedal fully depressed

      		 Below 1.5 V
      A74-13 (PB) - A74-3 (BRE2) B - G Vacuum sensor assembly (brake booster pressure sensor) signal

      • Ignition switch ON

      • Absolute pressure of 40 kPa (300 mm Hg, 11.8 in.Hg) applied to vacuum sensor assembly (brake booster pressure sensor)

      		 1.6 to 2.0 V

      • Ignition switch ON

      • Absolute pressure of 60 kPa (450 mm Hg, 17.7 in.Hg) applied to vacuum sensor assembly (brake booster pressure sensor)

      		 2.2 to 2.6 V

      • Ignition switch ON

      • Atmospheric pressure applied to vacuum sensor assembly (brake booster pressure sensor)

      		 3.4 to 3.8 V
      A74-14 (BRVC) - A73-8 (GND) P - W-B Vacuum sensor assembly (brake booster pressure sensor) power supply

      • Ignition switch ON

      • Engine stopped

      		 4.5 to 5.5 V
      A74-21 (STA) - A73-8 (GND) LG - W-B Starter operation signal Ignition switch ON 0 V to 1.5 V
      Cranking 6 V to 14 V
      A74-26 (TMVC) - A73-8 (GND) B - W-B Neutral position sensor (Neutral position switch) power supply

      • Ignition switch ON

      • Engine stopped

      		 4.5 to 5.5 V
      A74-27 (TMN) - A74-25 (TME2) R - GR Neutral position sensor (Neutral position switch) signal

      • Ignition switch ON

      • Shift lever in neutral

      		 2.7 to 4.3 V

      • Ignition switch ON

      • Shift lever in any other than neutral

      		 0.7 to 1.9 V
      A74-28 (CLL) - A73-8 (GND) G - W-B Clutch start switch assembly (for lower) signal

      • Ignition switch ON

      • Clutch pedal released

      		 8 to 14 V

      • Ignition switch ON

      • Clutch pedal fully depressed

      		 Below 1.5 V
      H121-2 (BO1) - A73-8 (GND) SB - W-B Backup boost converter signal Always 9.5 to 14 V
      H121-3 (ACO) - A73-8 (GND) GR - W-B Backup boost converter signal Ignition switch ACC 9.5 to 14 V
      H121-4 (CHI) - A73-8 (GND)* Y - W-B Combustion type power heater system operating signal

      • Ignition switch ON

      • Heater switch assembly on

      		 9.5 to 14 V

      • Ignition switch ON

      • Heater switch assembly off

      		 Below 1 V
      H121-11 (IGO2) - A73-8 (GND) P - W-B Backup boost converter signal Ignition switch ON 9.5 to 14 V
      H121-12 (IGO1) - A73-8 (GND) L - W-B Backup boost converter signal Ignition switch ON 9.5 to 14 V
      H121-17 (IG1) - A73-8 (GND) L - W-B Ignition switch signal Ignition switch ACC Below 1 V
      Ignition switch ON 9.5 to 14 V
      H121-19 (ACC) - A73-8 (GND) GR - W-B Ignition switch signal Ignition switch off Below 1 V
      Ignition switch ACC 9.5 to 14 V
      H121-20 (IG2) - A73-8 (GND) P - W-B Ignition switch signal Ignition switch ACC Below 1 V
      Ignition switch ON 9.5 to 14 V
      H121-23 (ECAN) - A73-8 (GND) V - W-B Stop and start system cancel switch (ecorun cancel switch assembly) signal

      • Ignition switch ON

      • Stop and start system cancel switch (ecorun cancel switch assembly) pressed

      		 0 to 1.5 V

      • Ignition switch ON

      • Stop and start system cancel switch (ecorun cancel switch assembly) not press

      		 8 to 14 V

      • *: w/ Combustion Type Power Heater System

    5. A01ITW1E01

      Waveform 1

      Engine Speed Signal
      Item Content
      Tester connection A74-10 (NE) - A73-8 (GND)
      Tool setting 5 V/DIV, 2 ms/DIV
      Condition Idling after engine warmed up

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.