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Terminals Of ECM

  1. SFI SYSTEM 
    Fig 1: Identifying B50 And A55 ECM Connector Terminals
    G05404421Courtesy 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 "STD Voltages" column.

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

    ECM CONNECTOR TERMINALS VOLTAGE SPECIFIED CONDITIONS

    Symbols (Terminal No.) Wiring Colors Terminal Descriptions Conditions STD Voltages
    +B (A55-2) - E1 (B50-81) R - W-B Power source of ECM Ignition switch to ON 9 to 14 V
    +B2 (A55-1) - E1 (B50-81) W - W-B Power source of ECM Ignition switch to ON 9 to 14 V
    BATT (A55-20) - E1 (B50-81) B - W-B Battery (for measuring the battery voltage and for the ECM memory) Always 9 to 14 V
    VPMP (A55-42) - E1 (B50-81) W - W-B Vent valve operation signal (built into canister pump module) Ignition switch to ON 9 to 14 V
    MPMP (A55-34) - E1 (B50-81) G - W-B Vacuum pump operation signal (built into canister pump module) Vacuum pump OFF 0 to 3 V
    MPMP (A55-34) - E1 (B50 -81) G - W-B Vacuum pump operation signal (built into canister pump module) Vacuum pump ON 9 to 14 V
    +BM (A55-3) - E1 (B50-81) LG - W-B Power source of ETCS throttle motor Always 9 to 14 V
    MREL (A55-44) - E1 (B50-81) BE - W-B EFI relay operation signal Ignition switch to ON 9 to 14 V
    IG SW (A55-28) - E1 (B50-81) Y - W-B Ignition switch signal Ignition switch to ON 9 to 14 V
    FC (A55-7) - E1 (B50-81) Y - W-B C/OPEN relay operation signal (fuel pump control) Ignition switch to ON, Engine stopped 9 to 14 V
    FC (A55-7) - E1 (B50-81) Y - W-B C/OPEN relay operation signal (fuel pump control) Ignition switch to ON, Engine idling 0 to 1.5V
    STP (A55-36) - E1 (B50-81) W - W-B Stop light switch signal Brake pedal depressed 7.5 to 14 V
    STP (A55-36) - E1 (B50-81) W - W-B Stop light switch signal Brake pedal released Below 1.5 V
    ST1- (A55-35) - E1 (B50-81) GR - W-B Stop light switch signal (opposite to STP terminal) Ignition switch to ON, Brake pedal depressed Below 1.5 V
    ST1- (A55-35) - E1 (B50-81) GR - W-B Stop light switch signal (opposite to STP terminal) Ignition switch to ON, Brake pedal released 7.5 to 14 V
    ACCR(2) (A55-13) - E1 (B50-81) B - W-B ACC relay control signal Cranking Below 1.5 V
    VPA (A55-55) - EPA (A55-59) G - Y Accelerator pedal position sensor signal (for engine control) Ignition switch to ON, Accelerator pedal fully released 0.5 to 1.1 V
    VPA (A55-55) - EPA (A55-59) G - Y Accelerator pedal position sensor signal (for engine control) Ignition switch to ON, Accelerator pedal fully depressed 2.6 to 4.5 V
    VPA2 (A55-56) - EPA2 (A55-60) R - BE Accelerator pedal position sensor signal (for sensor malfunction detection) Ignition switch to ON, Accelerator pedal fully released 1.2 to 2.0 V
    VPA2 (A55-56) - EPA2 (A55-60) R - BE Accelerator pedal position sensor signal (for sensor malfunction detection) Ignition switch to ON, Accelerator pedal fully depressed 3.4 to 5.0 V
    PPMP (B50-77) - E1 (B50-81) L - W-B Pressure sensor signal (built into canister pump module) Ignition switch to ON 3 to 3.6 V
    TC (A55-27) - E1 (B50-81) P - W-B Terminal TC of DLC3 Ignition switch to ON 9 to 14 V
    VCPA (A55-57) - EPA (A55-59) B - Y Power source of accelerator pedal position sensor (for VPA) Ignition switch to ON 4.5 to 5.0 V
    VCP2 (A55-58) - EPA2 (A55-60) L - BE Power source of accelerator pedal position sensor (for VPA2) Ignition switch to ON 4.5 to 5.0 V
    TACH (A55-15) - E1 (B50-81) B - W-B Engine speed signal (for combination meter) Idling Pulse generation (see  l waveform 12)
    SPD (A55-8) - E1 (B50-81) V - W-B Vehicle speed signal from combination meter Ignition switch to ON, Driving wheel rotated slowly Pulse generation (see  i waveform 9)
    W (A55-24) - E1 (B50-81) BR - W-B Malfunction Indicator Lamp (MIL) operation signal Ignition switch to ON Below 3.0 V
    W (A55-24) - E1 (B50-81) BR - W-B Malfunction Indicator Lamp (MIL) operation signal Idling 9 to 14 V
    CANH (A55-41) - CANL (A55-49) G - W CAN communication circuit Ignition switch off 54 to 69 Ω
    E1 (B50-81) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 V
    #10 (B50-45) - E01 (B50-22) B - W-B Fuel injector operation signal Ignition switch to ON 9 to 14 V
    #20 (B50-85) - E01 (B50-22) R - W-B
    #30 (B50-44) - E01 (B50-22) Y - W-B
    #40 (B50-84) - E01 (B50-22) L - W-B
    #50 (B50-43) - E01 (B50-22) W-L - W-B
    #60 (B50-83) - E01 (B50-22) BR - W-B
    #10 (B50-45) - E01 (B50-22) B - W-B Fuel injector operation signal Idling Pulse generation (see  c waveform 3)
    #20 (B50-85) - E01 (B50-22) R - W-B
    #30 (B50-44) - E01 (B50-22) Y - W-B
    #40 (B50-84) - E01 (B50-22) L - W-B
    #50 (850-43) - E01 (B50-22) W-L - W-B
    #60 (B50-83) - E01 (B50-22) BR - W-B
    VCV1 (B50-115) - E1 (B50-81) Y - W-B Power source for VVT sensor (specific voltage) Ignition switch to ON 4.5 to 5.0 V
    VCE1 (B50-114) - E1 (B50-81) R - W-B Power source for VVT sensor (specific voltage) Ignition switch to ON 4.5 to 5.0 V
    VCE2 (B50-112) - E1 (B50-81) LG - W-B Power source for VVT sensor (specific voltage) Ignition switch to ON 4.5 to 5.0 V
    VCV2 (B50-113) - E1 (B50-81) R - W-B Power source for VVT sensor (specific voltage) Ignition switch to ON 4.5 to 5.0 V
    VCPP (B50-75) - EPPM (B50-76) R - G Power source for canister pressure sensor (specific voltage) Ignition switch to ON 4.5 to 5.0 V
    STAR (B50-63) - E1 (B50-81) R - W-B Park/neutral position switch signal Ignition switch to ON, shift lever position P or N 9 to 14 V
    STA (A55-48) - E1 (850-81) V - W-B Starter relay operation signal Cranking 9 to 14 V
    STSW(2) (A55-14) - E1 (B50-81) R - W-B Starter relay operation signal Cranking 9 to 14 V
    OC2+ (B50-52) - OC2- (B50-51) BR - R Camshaft timing Oil Control Valve (OCV) operation signal (Intake side) Idling Pulse generation (see  a waveform 1)
    OC1+ (B50-58) - OC1- (B50-57) W - B Camshaft timing Oil Control Valve (OCV) operation signal (Intake side) Idling Pulse generation (see  a waveform 1)
    VV2+ (B50-67) - VV2- (B50-90) W - B Variable Valve Timing (VVT) sensor signal (Intake side) Idling Pulse generation (see  f waveform 6)
    VV1+ (850-69) - VV1- (B50-92) L-LG Variable Valve Timing (VVT) sensor signal (Intake side) Idling Pulse generation (see  f waveform 6)
    NE+ (B50-110) - NE- (B50-111) G - R Crankshaft position sensor signal Idling Pulse generation (see  e waveform 5)
    EV2+ (B50-66) - EV2- (B50-89) G-R - L Variable Valve Timing (VVT) sensor signal (Exhaust side) Idling Pulse generation (see  e waveform 5)
    EV1+ (B50-68) - EV1- (B50-91) Y - B Variable Valve Timing (VVT) sensor signal (Exhaust side) Idling Pulse generation (see  e waveform 5)
    OE1+ (B50-16) - OE1- (B50-17) L - LG Camshaft timing Oil Control Valve (OCV) operation signal (Exhaust side) Idling Pulse generation (see  a waveform 1)
    OE2+ (B50-14) - OE2- (B50-15) W - L-Y Camshaft timing Oil Control Valve (OCV) operation signal (Exhaust side) Idling Pulse generation (see  a waveform 1)
    HT1B (B50-48) - E1 (B50-81) LG - W-B Heated oxygen sensor heater operation signal Idling Below 3.0 V
    HT2B (B50-47) - E1 (B50-81) Y - W-B
    HT1B (B50-48) - E1 (B50-81) LG - W-B Heated oxygen sensor heater operation signal Ignition switch to ON 9 to 14 V
    HT2B (B50-47) - E1 (B50-81) Y - W-B
    ACM (B50-42) - E1 (B50-81) L-B - W-B VSV for active control mount system operation signal Ignition switch to ON 9 to 14 V
    M- (B50-18) - ME01 (B50-20) R - B Throttle drive motor operation signal (negative terminal) Idling with warm engine Pulse generation (see  k waveform 11)
    M+ (B50-19) - ME01 (B50-20) G - B Throttle drive motor operation signal (positive terminal) Idling with warm engine Pluse generation (see  j waveform 10)
    E02 (B50-21) - Body ground B-W - - Earth (ground) circuit of ECM Always Below 1 V
    E01 (850-22) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 V
    IGT1 (B50-40) - E1 (B50-81) W - W-B Ignition coil with igniter (ignition signal) Idling Pulse generation (see  f waveform 6)
    IGT2 (B50-39) - E1 (B50-81) G-R - W-B
    IGT3 (B50-38) - E1 (B50-81) G - W-B
    IGT4 (B50-37) - E1 (B50-81) LG - W-B
    IGT5 (B50-36) - E1 (B50-81) P - W-B
    IGT6 (B50-35) - E1 (B50-81) L-B - W-B
    GE01 (B50-41) - E1 (B50-81) G-R - W-B Shielded earth (ground) circuit of throttle drive motor Always Below 1 V
    OX1B (B50-88) - EX1B (B50-65) W - BR Heated oxygen sensor signal Engine speed at 2,500 rpm for 2 minutes after warming up Pulse generation (see  b waveform 2)
    OX2B (B50-87) - EX2B (B50-64) B - W-B
    VTA2 (B50-99) - ETA (B50-97) W-L - P Throttle position sensor signal (for sensor malfunction detection) Ignition switch to ON, Accelerator pedal fully released 2.1 to 3.1 V
    VTA2 (B50-99) - ETA (B50-97) W-L - P Throttle position sensor signal (for sensor malfunction detection) Ignition switch to ON, Accelerator pedal fully depressed 4.5 to 5.0 V
    VTA1 (B50-98) - ETA (B50-97) Y - P Throttle position sensor signal (for engine control) Ignition switch to ON, Throttle valve fully closed 0.5 to 1.2 V
    VTA1 (B50-98) - ETA (B50-97) Y - P Throttle position sensor signal (for engine control) Ignition switch to ON, Throttle valve fully open 3.2 to 4.8 V
    THW (B50-79) - ETHW (B50-78) B - B-W Engine coolant temperature sensor signal Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
    THA (B50-71) - ETHA (B50-74) P - G-R Intake air temperature sensor signal Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
    IGF1 (B50-106) - E1 (B50-81) BR - W-B Ignition coil with igniter (ignition confirmation signal) Ignition switch to ON 4.5 to 5.0 V
    IGF1 (B50-106) - E1 (B50-81) BR - W-B Ignition coil with igniter (ignition confirmation signal) Idling Pulse generation (see  g waveform 7)
    AICV (A55-4) - E1 (B50-81) V - W-B VSV for air intake control system operation signal Ignition switch to ON 9 to 14 V
    E2G (B50-73) - E1 (B50-81) LG - W-B Earth (ground) circuit of sensor for mass air flow meter Always Below 1 V
    VG (B50-72) - E2G (B50-73) L-B - LG Mass Air Flow (MAF) meter signal Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
    ACIS (B50-107) - E1 (B50-81) B-W - W-B VSV for ACIS (Acoustic Control Induction System) operation signal Ignition switch to ON 9 to 14 V
    PRG (B50-108) - E1 (B50-81) W - W-B Purge VSV for EVAP system operation signal Ignition switch to ON 9 to 14 V
    PRG (B50-108) - E1 (B50-81) W - W-B Purge VSV for EVAP system operation signal Idling Pulse generation (see  h waveform 8)
    HA2A (B50-109) - E05 (B50-46) B-W - W A/F sensor heater operation signal Idling Below 3.0 V
    HA2A (B50-109) - E05 (B50-46) B-W - W A/F sensor heater operation signal Ignition switch to ON 9 to 14 V
    HA1A (B50-86) - E04 (B50-23) G - W A/F sensor heater operation signal Idling Below 3.0 V
    HA1A (B50-86) - E04 (B50-23) G - W A/F sensor heater operation signal Ignition switch to ON 9 to 14 V
    ME01 (B50-20) - E1 (B50-81) B - W-B Earth (ground) circuit of ECM Always Below 1 V
    E03 (B50-104) - E1 (B50-81) B - W-B Earth (ground) circuit of ECM Always Below 1 V
    E05 (B50-46) - E1 (B50-81) W - W-B Earth (ground) circuit of ECM Always Below 1 V
    E04 (B50-23) - E1 (B50-81) W - W-B Earth (ground) circuit of ECM Always Below 1 V
    NSW (B50-62) - E1 (B50-81) L-B - W-B Park/Neutral position switch signal Ignition switch to ON, Shift lever position P or N Below 3.0 V
    NSW (B50-62) - E1 (B50-81) L-B - W-B Park/Neutral position switch signal Ignition switch to ON, Shift lever position other than P or N 9 to 14 V
    KNK2 (B50-118) - EKN2 (B50-117) B - W Knock sensor signal Engine speed at 4,000 rpm after warming up Pulse generation (see  d waveform 4)
    A1A+ (B50-93) - E1 (B50-81) L - W-B A/F sensor signal Ignition switch to ON 3.3 V(1)
    A2A+ (B50-120) - E1 (B50-81) BR - W-B A/F sensor signal Ignition switch to ON 3.3 V(1)
    KNK1 (B50-95) - EKNK (B50-94) R - G Knock sensor signal Engine speed at 4,000 rpm after warming up Pulse generation (see  d waveform 4)
    A1A- (B50-116) - E1 (B50-81) P - W-B A/F sensor Ignition switch to ON 3.0 V(1)
    A2A- (B50-119) - E1 (B50-81) Y - W-B A/F sensor Ignition switch to ON 3.0 V(1)
    (1) The ECM terminal voltage is constant regardless of the output voltage from the sensor.
    (2) w/ Smart Key System
    1. WAVEFORM 1
      1. Camshaft timing Oil Control Valve (OCV) operation signal
        WAVEFORM REFERENCE

        ECM Terminal Names Between OC1+ and OC1-, OC2+ and OC2-, OE1 + and OE1-, or OE2+ and OE2-
        Tester Ranges 5 V/DIV, 1 ms./DIV
        Conditions Idling

        HINT:

        The wavelength becomes shorter as the engine rpm increases.

        Fig 2: Camshaft Timing Oil Control Valve (OCV) Operation Signal Waveform
        G04973436Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. WAVEFORM 2
      1. Heated oxygen sensor signal
        WAVEFORM REFERENCE

        ECM Terminal Names Between OX1B and EX1B, or OX2B and EX2B
        Tester Ranges 0.2 V/DIV, 200 ms./DIV
        Conditions Engine speed is maintained at 2,500 rpm for 2 minutes after sensor is warmed up

        HINT:

        In the Data List, item O2S B1S2 shows the ECM input values from the heated oxygen sensor.

        Fig 3: Heated Oxygen Sensor Signal Waveform
        G04973437Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. WAVEFORM 3
      1. Fuel injector operation signal
        WAVEFORM REFERENCE

        ECM Terminal Names Between #10 (to 60) and E01
        Tester Ranges 30 V/DIV, 20 ms./DIV
        Conditions Idling

        HINT:

        The wavelength becomes shorter as the engine rpm increases.

        Fig 4: Fuel Injector Operation Signal Waveform
        G04973438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. WAVEFORM 4
      1. Knock sensor signal
        WAVEFORM REFERENCE

        ECM Terminal Names Between KNK1 and EKNK, or KNK2 and EKN2
        Tester Ranges 0.01 to 10 V/DIV, 0.01 to 10 ms./DIV
        Conditions Engine speed is maintained at 4,000 rpm after engine is warmed up

        HINT:

        • The wavelength becomes shorter as the engine rpm increases.
        • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
          Fig 5: Knock Sensor Signal Waveform
          G04973439Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. WAVEFORM 5
      1. Variable Valve Timing (VVT) sensor signal (1)
      2. Crankshaft position sensor signal (2)
        WAVEFORM REFERENCE

        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 rpm increases.

        Fig 6: Variable Valve Timing (VVT) And Crankshaft Position Sensor Signal Waveform
        G06226878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. WAVEFORM 6
      1. Variable Valve Timing (VVT) sensor signal (1)
      2. Crankshaft position sensor signal (2)
        WAVEFORM REFERENCE

        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 rpm increases.

        Fig 7: Variable Valve Timing (VVT) And Crankshaft Position Sensor Signal Waveform
        G06226879Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. WAVEFORM 7
      1. Igniter IGT signal (from ECM to igniter) (1)
      2. Igniter IGF signal (from igniter to ECM) (2)
        WAVEFORM REFERENCE

        ECM Terminal Names
        1. Between IGT (1 to 6) and E1
        2. Between IGF1 and E1
        Tester Ranges 2 V/DIV, 20 ms./DIV
        Conditions Idling

        HINT:

        The wavelength becomes shorter as the engine rpm increases.

        Fig 8: Igniter IGT And IGF Signal Waveform
        G04973441Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. WAVEFORM 8
      1. Purge VSV for EVAP system operation signal
        WAVEFORM REFERENCE

        ECM Terminal Names Between PRG and E1
        Tester Ranges 10 V/DIV, 50 ms./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.

        Fig 9: Purge VSV For EVAP System Operation Signal Waveform
        G04973442Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. WAVEFORM 9
      1. Vehicle speed signal
        WAVEFORM REFERENCE

        ECM Terminal Names Between SPD and E1
        Tester Ranges 2 V/DIV, 20 ms./DIV
        Conditions Ignition switch to ON, 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.
          Fig 10: Vehicle Speed Signal Waveform
          G04973443Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. WAVEFORM 10
      1. Throttle drive motor operation signal (positive terminal)
        WAVEFORM REFERENCE

        ECM Terminal Names Between M+ and ME01
        Tester Ranges 5 V/DIV, 1 ms./DIV
        Conditions Idling with warm engine

        HINT:

        The duty ratio varies depending on the throttle actuator operation.

        Fig 11: Throttle Drive Motor Operation Signal (Positive Terminal) Waveform
        G04973444Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. WAVEFORM 11
      1. Throttle drive motor operation signal (negative terminal)
        WAVEFORM REFERENCE

        ECM Terminal Names Between M- and ME01
        Tester Ranges 5 V/DIV, 1 ms./DIV
        Conditions Idling with warm engine

        HINT:

        The duty ratio varies depending on the throttle actuator operation.

        Fig 12: Throttle Drive Motor Operation Signal (Negative Terminal) Waveform
        G04973445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. WAVEFORM 12
      1. Engine speed signal
        WAVEFORM REFERENCE

        ECM Terminal Names Between TACH and E1
        Tester Ranges 5 V/DIV, 10 ms./DIV
        Conditions Idling

        HINT:

        The wavelength becomes shorter as the engine rpm increases.

        Fig 13: Engine Speed Signal Waveform
        G04973446Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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