2012 Toyota Highlander Limited, FWDFACTORY OEM SERVICE PROCEDURE

Terminals Of ECM

  1. SFI SYSTEM 
    Fig 1: ECU Connector Terminal Identification - ECM
    GTY181399Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT: 

    The standard normal voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated.

    The check results should be compared with the standard normal voltage for that pair of terminals, listed in the "Specified Condition" column.

    The illustration above can be used as a reference to identify the ECM terminal locations.

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    D61-22 (+B) - B49-12 (E1) SB - W-B Power source of ECM Ignition switch on (IG) 11 to 14 V
    D61-23 (+B2) - B49-12 (E1) GR - W-B Power source of ECM Ignition switch on (IG) 11 to 14 V
    D61-24 (BATT) - B49-12 (E1) R - W-B Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
    D60-19 (VPMP) - B49-12 (E1) W - W-B Vent valve operation signal (built into canister pump module) Ignition switch on (IG) 11 to 14 V
    D60-7 (MPMP) - B49-12 (E1) G - W-B Leak detection pump operation signal (built into canister pump module) Leak detection pump OFF 0 to 3 V
    D60-7 (MPMP) - B49-12 (E1) G - W-B Leak detection pump operation signal (built into canister pump module) Leak detection pump ON 9 to 14 V
    B49-23 (+BM) - B49-12 (E1) L - W-B Power source of ETCS throttle motor Always 11 to 14 V
    D61-9 (MREL) - B49-12 (E1) L - W-B EFI relay operation signal Ignition switch on (IG) 11 to 14 V
    D60-21 (IGSW) - B49-12 (E1) W - W-B Ignition switch signal Ignition switch on (IG) 11 to 14 V
    D61-3 (FC) - B49-12 (E1) P - W-B C/OPN relay operation signal (fuel pump control) Ignition switch on (IG) 11 to 14 V
    D60-18 (STP) - B49-12 (E1) R - W-B Stop light switch signal Brake pedal depressed 7.5 to 14 V
    D60-18 (STP) - B49-12 (E1) R - W-B Stop light switch signal Brake pedal released Below 1.5 V
    D61-8 (ST1-) - B49-12 (E1) LG - W-B Stop light switch signal (opposite to STP terminal) Ignition switch on (IG), Brake pedal depressed Below 1.5 V
    D61-8 (ST1-) - B49-12 (E1) LG - W-B Stop light switch signal (opposite to STP terminal) Ignition switch on (IG), Brake pedal released 7.5 to 14 V
    D60-13 (ACCR)*2 - B49-12 (E1) BE - W-B ACC control signal Cranking Below 1.5 V
    D60-6 (VPA) - D60-3 (EPA) R - SB Accelerator pedal position sensor signal (for engine control) Ignition switch on (IG), Accelerator pedal fully released 0.5 to 1.1 V
    D60-6 (VPA) - D60-3 (EPA) R - SB Accelerator pedal position sensor signal (for engine control) Ignition switch on (IG), Accelerator pedal fully depressed 2.6 to 4.5 V
    D60-5 (VPA2) - D60-1 (EPA2) GR - V Accelerator pedal position sensor signal (for sensor malfunction detection) Ignition switch on (IG), Accelerator pedal fully released 1.2 to 2.0 V
    D60-5 (VPA2) - D60-1 (EPA2) GR - V Accelerator pedal position sensor signal (for sensor malfunction detection) Ignition switch on (IG), Accelerator pedal fully depressed 3.4 to 5.0 V
    B50-1 (PPMP) - B49-12 (E1) L - W-B Pressure sensor signal (built into canister pump module) Ignition switch on (IG) 3 to 3.6 V
    D60-28 (TC) - B49-12 (E1) L - W-B Terminal TC of DLC3 Ignition switch on (IG) 11 to 14 V
    D60-4 (VCPA) - D60-3 (EPA) SB - SB Power source of accelerator pedal position sensor (for VPA) Ignition switch on (IG) 4.5 to 5.5 V
    D60-2 (VCP2) - D60-1 (EPA2) LG - V Power source of accelerator pedal position sensor (for VPA2) Ignition switch on (IG) 4.5 to 5.5 V
    D60-29 (TACH) - B49-12 (E1) B - W-B Engine speed signal (for combination meter) Idling Pulse generation
    (see waveform 12)
    D61-18 (SPD) - B49-12 (E1) LG - W-B Vehicle speed signal from combination meter Ignition switch on (IG), driving wheel rotated slowly Pulse generation
    (see waveform 9)
    D61-13 (W) - B49-12 (E1) Y - W-B Malfunction Indicator Lamp (MIL) operation signal Ignition switch on (IG) Below 3.0 V
    D61-13 (W) - B49-12 (E1) Y - W-B Malfunction Indicator Lamp (MIL) operation signal Idling 11 to 14 V
    D60-32 (CANH) - B49-12 (E1) R - W-B CAN communication circuit Ignition switch on (IG) Pulse generation
    (see waveform 13)
    D60-31 (CANL) - B49-12 (E1) W - W-B CAN communication circuit Ignition switch on (IG) Pulse generation
    (see waveform 14)
    B49-12 (E1) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 V
    B48-6 (#10) - B48-14 (E01)
    B48-1 (#20) - B48-14 (E01)
    B48-7 (#30) - B48-14 (E01)
    B48-2 (#40) - B48-14 (E01)
    B48-8 (#50) - B48-14 (E01)
    B48-3 (#60) - B48-14 (E01)    		 L - W-B
    Y - W-B
    R-L - W-B
    W - W-B
    R - W-B
    G - W-B    		 Fuel injector operation signal Ignition switch on (IG) 11 to 14 V
    B48-6 (#10) - B48-14 (E01)
    B48-1 (#20) - B48-14 (E01)
    B48-7 (#30) - B48-14 (E01)
    B48-2 (#40) - B48-14 (E01)
    B48-8 (#50) - B48-14 (E01)
    B48-3 (#60) - B48-14 (E01)    		 L - W-B
    Y - W-B
    R-L - W-B
    W - W-B
    R - W-B
    G - W-B    		 Fuel injector operation signal Idling Pulse generation
    (see waveform 3)
    B49-31 (STAR)*2 - B49-12 (E1) GR - W-B Starter relay control signal Ignition switch on (IG) Below 1 V
    Cranking 5.5 V or more
    D60-10 (STA) - B49-12 (E1) B - W-B Starter relay operation signal Cranking 11 to 14 V
    B50-2 (NSW) - B49-12 (E1) B - W-B Park/neutral position switch signal Ignition switch on (IG), Shift lever position P or N Below 1 V
    Ignition switch on (IG), Shift lever position except P or N 11 to 14 V
    D60-30 (STSW)*2 - B49-12 (E1) P - W-B Starter relay operation signal Cranking 8 to 14 V
    B51-20 (OC2-) - B51-19 (OC2+) P - LG Camshaft timing oil control valve operation signal (intake camshaft) Idling Pulse generation
    (see waveform 1)
    B50-20 (OC1-) - B50-19 (OC1+) L - Y Camshaft timing oil control valve operation signal (intake camshaft) Idling Pulse generation
    (see waveform 1)
    B51-12 (VV2+) - B51-11 (VV2-) P - L VVT sensor signal (intake camshaft) Idling Pulse generation
    (see waveform 6)
    B51-9 (VV1+) - B51-10 (VV1-) G - R VVT sensor signal (intake camshaft) Idling Pulse generation
    (see waveform 6)
    B51-6 (NE+) - B51-5 (NE-) W - B Crankshaft position sensor signal Idling Pulse generation
    (see waveform 5, 6)
    B51-18 (EV2+) - B51-17 (EV2-) L - R VVT sensor signal (exhaust camshaft) Idling Pulse generation
    (see waveform 5)
    B51-13 (EV1+) - B51-14 (EV1-) B - W VVT sensor signal (exhaust camshaft) Idling Pulse generation
    (see waveform 5)
    B50-21 (OE1+) - B50-22 (OE1-) G - R Camshaft timing oil control valve operation signal (intake camshaft) Idling Pulse generation
    (see waveform 1)
    B51-21 (OE2+) - B51-22 (OE2-) P - W Camshaft timing oil control valve operation signal (intake camshaft) Idling Pulse generation
    (see waveform 1)
    D60-8 (FPR) - B49-12 (E1) G - W-B Fuel pump control Cranking 11 to 14 V
    Idling Below 3 V
    B48-12 (HT1B) - B49-12 (E1) R - W-B Heated oxygen sensor heater operation signal Idling Below 3.0 V
    B48-12 (HT1B) - B49-12 (E1) R - W-B Heated oxygen sensor heater operation signal Ignition switch on (IG) 11 to 14 V
    B48-9 (ACM) - B49-12 (E1) G - W-B VSV for active control mount system operation signal Ignition switch on (IG) 11 to 14 V
    B49-29 (M-) - B48-10 (ME01) L - W-B Throttle drive motor operation signal (negative terminal) Idling with warm engine Pulse generation
    (see waveform 11)
    B48-20 (M+) - B48-10 (ME01) R - W-B Throttle drive motor operation signal (positive terminal) Idling with warm engine Pulse generation
    (see waveform 10)
    B48-15 (E02) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 V
    B48-14 (E01) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 V
    B49-24 (IGT1) - B49-12 (E1)
    B49-25 (IGT2) - B49-12 (E1)
    B49-26 (IGT3) - B49-12 (E1)
    B49-27 (IGT4) - B49-12 (E1)
    B49-28 (IGT5) - B49-12 (E1)
    B50-25 (IGT6) - B49-12 (E1)    		 Y - W-B
    P - W-B
    G - W-B
    L - W-B
    B - W-B
    LG - W-B    		 Ignition coil with igniter (ignition signal) Idling Pulse generation
    (see waveform 7)
    B49-30 (GE01) - B49-12 (E1) - - W-B Shielded earth (ground) circuit of throttle drive motor Always Below 1 V
    B51-2 (OX1B) - B51-1 (EX1B) B - BR Heated oxygen sensor signal With engine speed at 2500 RPM for 2 minutes after warming up engine Pulse generation
    (see waveform 2)
    B49-13 (VCTA) - B49-14 (ETA) Y - BR Power source of throttle position sensor Ignition switch on (IG) 4.5 to 5.5 V
    B49-16 (VTA2) - B50-7 (ETHA) LG - BR Throttle position sensor signal (for sensor malfunction detection) Ignition switch on (IG), Accelerator pedal fully released 2.1 to 3.1 V
    B49-16 (VTA2) - B50-7 (ETHA) LG - BR Throttle position sensor signal (for sensor malfunction detection) Ignition switch on (IG), Accelerator pedal fully depressed 4.6 to 5.0 V
    B49-15 (VTA1) - B50-7 (ETHA) B - BR Throttle position sensor signal (for engine control) Ignition switch on (IG), Accelerator pedal fully released 0.5 to 1.1 V
    B49-15 (VTA1) - B50-7 (ETHA) B - BR Throttle position sensor signal (for engine control) Ignition switch on (IG), Accelerator pedal fully depressed 3.2 to 4.8 V
    B49-17 (THW) - B50-8 (ETHW) W - BR Engine coolant temperature sensor signal Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
    B50-15 (THA) - B50-13 (E2G) P - Y Intake air temperature sensor signal Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
    B51-15 (VCV1) - B49-12 (E1) Y - W-B Power source of sensors (specific voltage) Ignition switch on (IG) 4.5 to 5.5 V
    B51-16 (VCV2) - B49-12 (E1) Y - W-B power source of VVT sensor (specific voltage) Ignition switch on (IG) 4.5 to 5.5 V
    B49-6 (IGF1) - B49-12 (E1) W - W-B Ignition coil with igniter (ignition confirmation signal) Ignition switch on (IG) 4.5 to 5.0 V
    B49-6 (IGF1) - B49-12 (E1) W - W-B Ignition coil with igniter (ignition confirmation signal) Idling Pulse generation
    (see waveform 7)
    B49-20 (AICV) - B49-12 (E1) W - W-B VSV for air intake control system operation signal Ignition switch on (IG) 11 to 14 V
    B50-13 (E2G) - B49-12 (E1) Y - W-B Earth (ground) circuit of sensor for mass air flow meter Always Below 1 V
    B50-14 (VG) - B50-13 (E2G) R - Y Mass air flow meter signal Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
    B49-19 (ACIS) - B49-12 (E1) L - W-B VSV for acoustic control induction system operation signal Ignition switch on (IG) 11 to 14 V
    B49-18 (PRG) - B49-12 (E1) G - W-B Purge VSV for EVAP system operation signal Ignition switch on (IG) 11 to 14 V
    B49-18 (PRG) - B49-12 (E1) G - W-B Purge VSV for EVAP system operation signal Idling Pulse generation
    (see waveform 8)
    B48-19 (HA2A) - B48-18 (E05) B - W-B Air fuel ratio sensor heater operation signal Idling Below 3.0 V
    B48-19 (HA2A) - B48-18 (E05) B - W-B Air fuel ratio sensor heater operation signal Ignition switch on (IG) 11 to 14 V
    B48-17 (HA1A) - B48-16 (E04) L - W-B Air fuel ratio sensor heater operation signal Idling Below 3.0 V
    B48-17 (HA1A) - B48-16 (E04) L - W-B Air fuel ratio sensor heater operation signal Ignition switch on (IG) 11 to 14 V
    B48-11 (E03) - B49-12 (E1) W-B - W-B Earth (ground) circuit of ECM Always Below 1 V
    B48-13 (HT2B) - B49-12 (E1) R - W-B Heated oxygen sensor heater operation signal Idling Below 3.0 V
    B48-13 (HT2B) - B49-12 (E1) R - W-B Heated oxygen sensor heater operation signal Ignition switch on (IG) 11 to 14 V
    B48-18 (E05) - B49-12 (E1) W-B - W-B Earth (ground) circuit of ECM Always Below 1 V
    B48-16 (E04) - B49-12 (E1) W-B - W-B Earth (ground) circuit of ECM Always Below 1 V
    B50-5 (KNK2) - B50-6 (EKN2) R - G Knock sensor signal With engine speed at 4000 RPM after warming up engine Pulse generation
    (see waveform 4)
    B49-1 (A1A+) - B49-2 (A1A-) BR - Y Air fuel ratio sensor signal Ignition switch on (IG) 3.3 V*1
    B49-7 (A2A+) - B49-8 (A2A-) P - L Air fuel ratio sensor signal Ignition switch on (IG) 3.3 V*1
    B50-11 (KNK1) - B50-12 (EKNK) B - W Knock sensor signal With engine speed at 4000 RPM after warming up engine Pulse generation
    (see waveform 4)
    B49-2 (A1A-) - B49-12 (E1) Y - W-B Air fuel ratio sensor Ignition switch on (IG) 3.0 V*1
    B49-8 (A2A-) - B49-12 (E1) L - W-B Air fuel ratio sensor Ignition switch on (IG) 3.0 V*1
    B51-4 (OX2B) - B51-3 (EX2B) B - BR Heated oxygen sensor signal With engine speed at 2500 RPM for 2 minutes after warming up engine Pulse generation
    (see waveform 2)

    *1 : The ECM terminal voltage is constant regardless of the output voltage from the sensor.

    *2 : w/ Smart Key System

    1. WAVEFORM 1
      Fig 2: Identifying Waveform 1
      GTY179227Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Camshaft timing oil control valve operation signal
        ECM Terminal Names Between OC1+ and OC1-, OC2+ and OC2-, OE1+ and OE1-, or OE2+ and OE2-
        Tester Ranges 5 V/DIV, 1 msec./DIV
        Conditions Idling
    2. WAVEFORM 2
      Fig 3: Identifying Waveform 2
      GTY189975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Heated oxygen sensor signal
        ECM Terminal Names Between OX1B and EX1B, or OX2B and EX2B
        Tester Ranges 0.2 V/DIV, 200 msec./DIV
        Conditions With engine speed at 2500 RPM for 2 minutes after warming up engine

        HINT: 

        In the DATA LIST, item O2S B1S2 and O2S B2S2 shows the ECM input values from the heated oxygen sensor.

    3. WAVEFORM 3
      Fig 4: Identifying Waveform 3
      GTY315826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Fuel injector operation signal
        ECM Terminal Names Between #10 (to 60) and E01
        Tester Ranges 20 V/DIV, 20 msec./DIV
        Conditions Idling

        HINT: 

        The wavelength becomes shorter as the engine speed increases.

    4. WAVEFORM 4
      Fig 5: Identifying Waveform 4
      GTY191585Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Knock sensor signal
        ECM Terminal Names Between KNK1 and EKNK, or KNK2 and EKN2
        Tester Ranges 1 V/DIV, 1 msec./DIV
        Conditions With engine speed at 4000 RPM after warming up engine

        HINT: 

        • The wavelength becomes shorter as the engine speed increases.
        • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
    5. WAVEFORM 5
      Fig 6: Identifying Waveform 5
      GTY192271Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Variable Valve Timing (VVT) sensor signal
      2. Crankshaft position sensor signal
        ECM Terminal Names (1) EV1+ and EV1-, or EV2+ and EV2-
        (2) Between NE+ and NE-
        Tester Ranges 5 V/DIV, 20 ms./DIV
        Conditions Idling

        HINT: 

        The wavelength becomes shorter as the engine speed increases.

    6. WAVEFORM 6
      Fig 7: Identifying Waveform 6
      GTY186543Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Variable Valve Timing (VVT) sensor signal
      2. Crankshaft position sensor signal
        ECM Terminal Names (1) Between VV1+ and VV1-, VV2+ and VV2-
        (2) Between NE+ and NE-
        Tester Ranges 5 V/DIV, 20 ms./DIV
        Conditions Idling

        HINT: 

        The wavelength becomes shorter as the engine speed increases.

    7. WAVEFORM 7
      Fig 8: Identifying Waveform 7
      GTY322440Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Igniter IGT signal (from ECM to igniter)
      2. Igniter IGF signal (from igniter to ECM)
        ECM Terminal Names (1) Between IGT (1 to 6) and E1
        (2) Between IGF1 and E1
        Tester Ranges 2 V/DIV, 20 msec./DIV
        Conditions Idling

        HINT: 

        The wavelength becomes shorter as the engine speed increases.

    8. WAVEFORM 8
      Fig 9: Identifying Waveform 8
      GTY317179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Purge VSV for EVAP system operation signal
        ECM Terminal Names Between PRG and E1
        Tester Ranges 10 V/DIV, 20 msec./DIV
        Conditions Idling

        HINT: 

        If the waveform is not similar to that shown in the illustration, check the waveform again after idling for 10 minutes or more.

    9. WAVEFORM 9
      Fig 10: Identifying Waveform 9
      GTY171163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Vehicle speed signal
        ECM Terminal Names Between SPD and E1
        Tester Ranges 2 V/DIV, 20 msec./DIV
        Conditions Ignition switch on (IG), driving wheel rotated slowly

        HINT: 

        • The wavelength becomes shorter as the vehicle speed increases.
        • Depending on the vehicle, the output waveform voltage may rise to 12 V if influenced by optionally installed systems.
    10. WAVEFORM 10
      Fig 11: Identifying Waveform 10
      GTY316529Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Throttle drive motor operation signal (positive terminal)
        ECM Terminal Names Between M+ and ME01
        Tester Ranges 5 V/DIV, 1 msec./DIV
        Conditions Idling with warm engine

        HINT: 

        The duty ratio varies depending on the throttle actuator operation.

    11. WAVEFORM 11
      Fig 12: Identifying Waveform 11
      GTY321879Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Throttle drive motor operation signal (negative terminal)
        ECM Terminal Names Between M- and ME01
        Tester Ranges 5 V/DIV, 1 msec./DIV
        Conditions Idling with warm engine

        HINT: 

        The duty ratio varies depending on the throttle actuator operation.

    12. WAVEFORM 12
      Fig 13: Identifying Waveform 12
      GTY191646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Engine speed signal
        ECM Terminal Names Between TACH and E1
        Tester Ranges 5 V/DIV, 10 msec./DIV
        Conditions Idling

        HINT: 

        The wavelength becomes shorter as the engine speed increases.

    13. WAVEFORM 13
      Fig 14: Identifying Waveform 13
      GTY125259Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. CAN communication signal
        ECM Terminal Name Between CANH and E1
        Tester Range 1 V/DIV., 10 μs./DIV.
        Condition Ignition switch on (IG)

        HINT: 

        The wavelength varies depending on the CAN communication signal.

    14. WAVEFORM 14
      Fig 15: Identifying Waveform 14
      GTY144118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. CAN communication signal
        ECM Terminal Name Between CANL and E1
        Tester Range 1 V/DIV., 10 μs./DIV.
        Condition Ignition switch on (IG)

        HINT: 

        The wavelength varies depending on the CAN communication signal.

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