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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Stop And Start System - Diagnostics - Introduction (1 Of 2) >> Stop And Start System >> Terminals Of Ecu [12/2019 - 10/2022] >> Terminals Of Ecu [12/2019 - 10/2022]

Terminals Of Ecu [12/2019 - 10/2022]

  1. ENGINE STOP AND START ECU 
    GTY914132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the engine stop and start ECU connectors.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      A33-1 (BIN2) - Body ground Battery Always 9.5 to 14 V
      A33-2 (GND2) - Body ground Ground Always Below 1 Ω
      A33-3 (BIN1) - Body ground Battery Always 9.5 to 14 V
      A33-8 (GND1) - Body ground Ground Always Below 1 Ω
      A34-1 (+B) - Body ground Power source of engine stop and start ECU Ignition switch ON 9.5 to 14 V
      A34-6 (DGND) - Body ground Ground Always Below 1 Ω
      A34-10 (NE) - Body ground Engine speed signal from ECM Always 10 kΩ or higher
      H66-13 (CANH) - Body ground CAN communication Always 200 Ω or higher
      H66-14 (CANL) - Body ground CAN communication Always 200 Ω or higher
      H66-18 (IG2) - Body ground Ignition switch signal Ignition switch ON 9.5 to 14 V
      H66-19 (ACC) - Body ground Ignition switch signal Ignition switch ACC 9.5 to 14 V
      H66-20 (ILL) - Body ground Headlight dimmer switch (light control switch) tail signal input Headlight dimmer switch (light control switch) in tail or head position 9.5 to 14 V
      H66-21 (IG1) - Body ground Ignition switch signal Ignition switch ON 9.5 to 14 V
    3. Reconnect the engine stop and start ECU connectors.
    4. Measure the resistance, voltage and pulse according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      A34-3 (BRE2) - Body ground Ground (vacuum sensor assembly) Always Below 1 Ω
      A34-5 (WP) - Body ground Heater water pump assembly signal Heater water pump assembly not operating
      HINT: 
      Data List item "Heater Water Pump Status" displays OFF      		 9.5 to 14 V
      Heater water pump assembly operating
      HINT: 
      Data List item "Heater Water Pump Status" displays ON      		 0 V
      A34-7 (BNT1) - A34-6 (DGND) Engine hood courtesy switch (hood lock assembly) signal
      • Ignition switch ON
      • Engine stopped
      • Engine hood closed
      		 Below 1.5 V
      • Ignition switch ON
      • Engine stopped
      • Engine hood open
      		 8 to 14 V
      A34-10 (NE) - A34-6 (DGND) Engine speed signal from ECM Idling after engine warmed up Pulse generation
      (See waveform 1)
      A34-13 (PB) - A34-3 (BRE2) Vacuum sensor assembly signal
      • Ignition switch ON
      • Absolute pressure of 40 kPa (300 mmHg, 11.8 in.Hg) applied to vacuum sensor assembly
      		 1.6 to 2.0 V
      • Ignition switch ON
      • Absolute pressure of 60 kPa (450 mmHg, 17.7 in.Hg) applied to vacuum sensor assembly
      		 2.2 to 2.6 V
      • Ignition switch ON
      • Atmospheric pressure applied to vacuum sensor assembly
      		 3.4 to 3.8 V
      A34-14 (BRVC) - A34-6 (DGND) Vacuum sensor assembly power supply
      • Ignition switch ON
      • Engine stopped
      		 4.5 to 5.5 V
      A34-17 (CLL) - A34-6 (DGND) Park/Neutral position switch assembly signal
      • Ignition switch ON
      • Shift lever not in P or N
      		 8 to 14 V
      • Ignition switch ON
      • Shift lever in P or N
      		 Below 3.0 V
      A34-19 (DON2) - A34-6 (DGND) External backup boost converter (eco run vehicle converter assembly) signal Engine running Pulse generation
      (see waveform 2)
      A34-21 (STA) - A34-6 (DGND) Starter pinion operation signal Cranking 6.0 V or more
      H66-1 (IG31) - A34-6 (DGND) Backup boost converter signal Ignition switch ON 10.5 to 16 V
      H66-2 (B41) - A34-6 (DGND) Backup boost converter signal Always 10.5 to 16 V
      H66-3 (IG41) - A34-6 (DGND) Backup boost converter signal Ignition switch ON 10.5 to 16 V
      H66-5 (ECAN) - A34-6 (DGND) Stop and start system cancel switch (eco-run cancel switch assembly) signal
      • Ignition switch ON
      • Stop and start system cancel switch (eco-run cancel switch assembly) pressed
      		 Below 1.5 V
      • Ignition switch ON
      • Stop and start system cancel switch (eco-run cancel switch assembly) not pressed
      		 8 to 14 V
      H66-6 (IG11) - A34-6 (DGND) Backup boost converter signal Ignition switch ON 10.5 to 16 V
      H66-8 (EGND) - A33-8 (GND1) Oil pump with solenoid assembly directions signal One of the following conditions is met:
      • Engine stopped by stop and start control
      • Ignition switch ON (engine not running) and Active Test [Electromagnetic Oil Pump] being performed
      		 Pulse generation
      (See waveform 3)
      H66-9 (EMOP) - A33-8 (GND1) Oil pump with solenoid assembly directions signal One of the following conditions is met:
      • Engine stopped by stop and start control
      • Ignition switch ON (engine not running) and Active Test [Electromagnetic Oil Pump] being performed
      		 Pulse generation
      (See waveform 3)
      H66-10 (IG12) - A34-6 (DGND) Backup boost converter signal Ignition switch ON 10.5 to 16 V
      H66-11 (B43) - A34-6 (DGND) Backup boost converter signal Always 10.5 to 16 V
      H66-12 (B42) - A34-6 (DGND) Backup boost converter signal Always 10.5 to 16 V
      H66-16 (B12) - A34-6 (DGND) Backup boost converter signal Always 10.5 to 16 V
      H66-18 (IG2) - A34-6 (DGND) Push start switch signal Ignition switch ACC Below 1 V
      Ignition switch ON 9.5 to 14 V
      H66-19 (ACC) - A34-6 (DGND) Push start switch signal Ignition switch off Below 1 V
      Ignition switch ACC 9.5 to 14 V
      H66-21 (IG1) - A34-6 (DGND) Push start switch signal Ignition switch ACC Below 1 V
      Ignition switch ON 9.5 to 14 V
      H66-24 (AC41) - A34-6 (DGND) Backup boost converter signal Ignition switch ACC 10.5 to 16 V
      H66-25 (IL41) - A34-6 (DGND) Backup boost converter signal Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      H66-26 (IG13) - A34-6 (DGND) Backup boost converter signal Ignition switch ON 10.5 to 16 V
    5. Waveform 1
      GTY866431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Tester Connection A34-10 (NE) - A34-6 (DGND)
      Tool Setting 5 V/DIV., 2 ms./DIV.
      Condition Idling after engine warmed up
    6. Waveform 2
      GTY869187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Tester Connection A34-19 (DON2) - A34-6 (DGND)
      Tool Setting 5 V/DIV., 2 ms./DIV.
      Condition Engine running
    7. Waveform 3
      GTY862698Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Tester Connection H66-8 (EGND) - A33-8 (GND1)
      Tool Setting 10 V/DIV., 20 ms./DIV.
      Condition One of the following conditions is met:
      • Engine stopped by stop and start control
      • Ignition switch ON (engine not running) and Active Test [Electromagnetic Oil Pump] being performed
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