STOP AND START SYSTEM TERMINALS OF ECU

  1. ENGINE STOP AND START ECU

    U122114E02

    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. A278994E01

      Waveform 1

      Table 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
      Tip:

      The wavelength becomes shorter as the engine speed increases.