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Terminals Of ECM

  1. ECM 
    Fig 1: Identifying ECM Connector Terminals
    G04967765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the STD Voltage column. The illustration above can be used as a reference to identify the ECM terminal locations.

    STANDARD NORMAL VOLTAGE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition STD Voltage
    BATT (E8-3) - E1 (E6-1) L-W-B Battery (for measuring the battery voltage and for the ECM memory) Always 9 to 14V
    +BM (E8-7) - E1 (E6-1) GR - W-B Power source of throttle motor Always 9 to 14 V
    IG SW (E8-9) - E1 (E6-1) B-0 - W-B Ignition switch Ignition switch ON 9 to 14 V
    +B (E8-1) - E1 (E6-1) B-W-B Power source of ECM Ignition switch ON 9 to 14 V
    +B2 (E8-2) - E1 (E6-1) B-W-B Power source of ECM Ignition switch ON 9 to 14 V
    MREL (E8-8) - E1 (E6-1) W-G - W-B EFI relay Ignition switch ON 9 to 14 V
    VC (E4-23) - E2 (E4-28) L-R - BR Power source for sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
    VG (E4-30) - E2G (E4-29) W-R - B-W Mass air flow meter Idling, shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
    THA (E4-22) - E2 (E4-28) Y-B - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
    THW (E4-21) - E2 (E4-28) R-L - BRS Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
    VTA1 (E4-20) - E2 (E4-28) Y-BR Throttle position sensor (for engine control) Ignition switch ON, throttle valve fully closed 0.5 to 1.2 V
    VTA1 (E4-20) - E2 (E4-28) Y-BR Throttle position sensor (for engine control) Ignition switch ON, throttle valve fully open 3.2 to 4.8 V
    VTA2 (E4-19) - E2 (E4-28) R-B - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully open 2.1 to 3.1 V
    VTA2 (E4-19) - E2 (E4-28) R-B - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully open 4.5 to 5.5 V
    VPA (E8-18)-EPA (E8-20) W-R - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, throttle valve fully closed 0.5 to 1.1 V
    VPA (E8-18) - EPA (E8-20) W-R - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, throttle valve fully open 2.6 to 4.5 V
    VPA2 (E8-19) - EPA2 (E8-21) R-B - V-W Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully closed 1.2 to 2.0 V
    OC1+ (E6-17)-OC1- (E6-16) P-LG Camshaft timing oil control valve (OCV) Idling Pulse generation (See WAVEFORM 3 )
    OC2+ (E6-15) - OC2- (E6-14) R-W-Y-R Camshaft timing oil control valve (OCV) Idling Pulse generation (See WAVEFORM 3 )
    W1+ (E6-25)-W1- (E6-24) Y*1 - L*1 Variable valve timing (VVT) sensor (Bank 1) Idling Pulse generation (See WAVEFORM 4 )
    W2+ (E6-18)-W2- (E6-28) R*1 - G*1 Variable valve timing (VVT) sensor (Bank 2) Idling Pulse generation (See WAVEFORM 4 )
    M+ (E4-5) - E1 (E6-1) R*1 - W-B Throttle motor Idling Pulse generation (See WAVEFORM 7 )
    M- (E4-4) - E1 (E6-1) G*1-W-B Throttle motor Idling Pulse generation (See WAVEFORM 8 )
    A1A+ (E5-22) - E1 (E6-1) Y*1 - W-B A/F sensor Ignition switch ON 3.3 V*2
    A1A- (E5-30) - E1 (E6-1) BR*1 - W-B A/F sensor Ignition switch ON 3.0 V*2
    A2A+ (E5-23) - E1 (E6-1) P*1-W-B A/F sensor Ignition switch ON 3.3 V*2
    A2A- (E5-31) - E1 (E6-1) L*1 - W-B A/F sensor Ignition switch ON 3.0 V*2
    HA1A (E5-2) - E1 (E6-1) R-L - W-B A/F sensor heater Idling Below 3.0 V
    HA1A (E5-2) - E1 (E6-1) R-L - W-B A/F sensor heater Ignition switch ON 9 to 14V
    HA2A (E5-1) - E1 (E6-1) B-W-W-B A/F sensor heater Idling Below 3.0 V
    HA2A (E5-1) - E1 (E6-1) B-W - W-B A/F sensor heater Ignition switch ON 9 to 14 V
    VPA2 (E8-19) - EPA2 (E8-21) R-B - V-W Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully open 3.4 to 5.3 V
    VCPA (E8-26) - EPA (E8-20) B-Y-LG-B Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
    VCP2 (E8-27) - EPA2 (E8-21) W-L - V-W Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
    OX1B (E4-18) - E1 (E6-1) B*1 - W-B Heated oxygen sensor Maintain engine speed at 2,500 rpm for 2 minutes after warming up Pulse generation (See WAVEFORM 10 )
    OX2B (E5-33) - E1 (E6-1) W*1 - W-B
    HT1B (E4-1) - E1 (E6-1) G-Y-W-B Heated oxygen sensor heater Idling Below 3.0 V
    HT2B (E5-5) - E1 (E6-1) P-W-B
    HT1B (E4-1) - E1 (E6-1) G-Y-W-B Heated oxygen sensor heater Ignition switch ON 9 to 14 V
    HT2B (E5-5) - E1 (E6-1) P-W-B
    #10 (E6-2)-E01 (E4-7) R-L - W-B Injector Ignition switch ON 9 to 14 V
    #20 (E6-3) - E01 (E4-7) L-W-B
    #30 (E6-4) - E01 (E4-7) W-W-B
    #40 (E6-5)-E01 (E4-7) Y-W-B
    #50 (E6-6)-E01 (E4-7) G-W-B
    #60 (E6-7) - E01 (E4-7) R-W-B
    #70 (E4-3) - E01 (E4-7) W-W-B
    #80 (E4-2)-E01 (E4-7) BR-W-B
    #10 (E6-2)-E01 (E4-7) R-L - W-B Injector Idling Pulse generation (See WAVEFORM 1 )
    #20 (E6-3) - E01 (E4-7) L-W-B
    #30 (E6-4) - E01 (E4-7) W-W-B
    #40 (E6-5) - E01 (E4-7) Y-W-B
    #50 (E6-6) - E01 (E4-7) G-W-B
    #60 (E6-7) - E01 (E4-7) R-W-B
    #70 (E4-3) - E01 (E4-7) W-W-B
    #80 (E4-2) - E01 (E4-7) BR - W-B
    KNK1 (E5-29) - EKNK (E5-28) G*1 - R*1 Knock sensor Maintain engine speed at 4,000 rpm after warming up Pulse generation (See WAVEFORM 2 )
    KNK2 (E5-21)-EKN2 (E5-20) W*1 - B*1 Knock sensor Maintain engine speed at 4,000 rpm after warming up Pulse generation (See WAVEFORM 2 )
    G2+ (E6-19)-G2- (E6-29) B-W Camshaft position sensor Idling Pulse generation (See WAVEFORM 5 )
    NE+ (E6-21)-NE- (E6-20) L*1 -Y*1 Crankshaft position sensor Idling Pulse generation (See WAVEFORM 5 )
    PRG (E4-34) - E1 (E6-1) Y-R - W-B VSV for EVAP Ignition switch ON 9 to 14 V
    SPD (E7-8) - E1 (E6-1) V-R - W-B Speed signal from combination meter Ignition switch ON, Rotate driving wheel slowly Pulse generation (See WAVEFORM 6 )
    FPR (E6-30) - E1 (E6-1) G-R - W-B Fuel pump relay Ignition switch ON 0 to 3.0 V
    FC (E8-10) - E1 (E6-1) GR-B - W-B Fuel pump control Ignition switch ON 9 to 14 V
    IGT1 (E4-8) - E1 (E6-1) LG - W-B Ignition coil with igniter (ignition signal) Idling Pulse generation (See WAVEFORM 9 )
    IGT2 (E4-15) - E1 (E6-1) LG-B - W-B
    IGT3 (E4-11) - E1 (E6-1) L-W - W-B
    IGT4 (E4-10) - E1 (E6-1) L-Y - W-B
    IGT5 (E4-13) - E1 (E6-1) B-L - W-B
    IGT6 (E4-12) - E1 (E6-1) G-W-B
    IGT7 (E4-14) - E1 (E6-1) G-W - W-B
    IGT8 (E4-9) - E1 (E6-1) G-B - W-B
    IGF1 (E4-24) - E1 (E6-1) R-Y - W-B Ignition coil with igniter (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
    IGF2 (E4-25) - E1 (E6-1) R-W - W-B
    IGF1 (E4-24) - E1 (E6-1) R-Y - W-B Ignition coil with igniter (ignition confirmation signal) Idling Pulse generation (See WAVEFORM 9 )
    IGF2 (E4-25) - E1 (E6-1) R-W - W-B
    STP (E8-15) - E1 (E6-1) G-Y - W-B Stop light switch Brake pedal depressed 7.5 to 14 V
    STP (E8-15) - E1 (E6-1) G-Y - W-B Stop light switch Brake pedal released Below 1.5 V
    ST1- (E8-16) - E1 (E6-1) R-L - W-B Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal depressed Below 1.5 V
    ST1- (E8-16) - E1 (E6-1) R-L - W-B Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal released 7.5 to 14 V
    STAR/NSW (E5-8) - E1 (E6-1) P-W-B Park/Neutral position switch Ignition switch ON, Shift lever position other than P and N 9 to 14 V
    STAR/NSW (E5-8) - E1 (E6-1) P-W-B Park/Neutral position switch Ignition switch ON, Shift lever position in P, N Below 3.0 V
    W (E7-30) - E1 (E6-1) R-B - W-B MIL Idling 9 to 14 V
    W (E7-30) - E1 (E6-1) R-B - W-B MIL Ignition switch ON Below 3.0 V
    ELS1 (E7-13) - E1 (E6-1) G-W-B Electric load Taillight switch ON, Defogger switch ON 7.5 to 14 V
    ELS2 (E7-12) - E1 (E6-1) Y-G - W-B Electric load Taillight switch OFF, Defogger switch OFF 0 to 1.5 V
    TACH (E7-1) - E1 (E6-1) B-W - W-B Engine speed Idling Pulse generation (See WAVEFORM 11 )
    TC (E8-23) - E1 (E6-1) P-L - W-B Terminal TC of DLC3 Ignition switch ON 9 to 14 V
    STA (E6-11) - E1 (E6-1) B-Y - W-B Starter signal Cranking 6 V or higher
    STA (E6-11) - E1 (E6-1) B-Y - W-B Park/neutral position switch Shift lever position P or N, Ignition switch START 9 to 14 V
    STSW (E6-12) - E1 (E6-1) L-Y - W-B STA No. 2 fuse Shift lever position P or N, Ignition switch START 9 to 14 V
    VPMP (E8-5) - E1 (E6-1) R-G - W-B Canister closed valve Ignition switch ON 9 V to 14 V
    MPMP (E8-6) - E1 (E6-1) O-W-B Leak detection pump Vacuum pump OFF 0V to 3V
    MPMP (E8-6) - E1 (E6-1) O-W-B Leak detection pump Vacuum pump ON 9V to 14V
    PPMP (E8-22) - E1 (E6-1) R-W-B Vapor pressure sensor Ignition switch ON 3 V to 3.6 V
    AIV1 (E4-27) - E1 (E6-1) P-W-B VSV for air injection control (Bank 1) Ignition switch ON 9 to 14 V
    AIV2 (E4-26) - E1 (E6-1) L-W-B VSV for air injection control (Bank 2) Ignition switch ON 9 to 14 V
    AIRV (E8-4) - E1 (E6-1) Y-W-B Al driver (ASV control signal) Ignition switch ON 9 to 14 V
    AIRP (E8-25) - E1 (E6-1) G-W-B Al driver (Air pump control signal) Ignition switch ON 9 to 14 V
    AIP (E4-32) - E1 (E6-1) W-L - W-B Air pressure sensor Ignition switch ON 3 V to 3.6 V
    HINT:
    *1: Shielded
    *2: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
    1. WAVEFORM 1
      Fig 2: Fuel Injector Waveform
      G04967766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Fuel injector 

      WAVEFORM REFERENCE

      ECM Terminal Names Between #10 (to #40) and E01
      Tester Range 20 V/DIV., 20 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as engine rpm increases.

    2. WAVEFORM 2
      Fig 3: Knock Sensor Waveform
      G04967767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Knock sensor 

      WAVEFORM REFERENCE

      ECM Terminal Name Between KNK1 and EKNK
      Between KNK2 and EKN2
      Tester Range 1 V/DIV, I msec/DIV.
      Condition Maintain engine RPM at 2,000 rpm after engine warmed-up

      HINT:

      • The wavelength becomes shorter as engine rpm increases.
      • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
    3. WAVEFORM 3
      Fig 4: Camshaft Timing Oil Control Valve (OCV) Waveform
      G04967768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Camshaft timing oil control valve (OCV) 

      WAVEFORM REFERENCE

      ECM Terminal Name Between OC1+ and OC1-
      Between OC2+ and OC2-
      Tester Range 0.2 V/DIV., 200 msec./DIV.
      Condition Accelerate slowly after engine warmed-up

      HINT:

      In the DATA LIST, the items VVT OCV DUTY B1 and B2 show the duty ratio of voltage flowing to the OCV (see illustration).

      VVT OCV DUTY B1, B2 = A/B x 100 (%)

    4. WAVEFORM 4
      Fig 5: Variable Valve Timing (VVT) Sensor (Bank 1, 2) And Crankshaft Position Sensor Waveform
      G04967769Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Variable Valve Timing (VVT) sensor (bank 1, 2) and Crankshaft position sensor 

      WAVEFORM REFERENCE

      ECM Terminal Name CH1: Between W1+ and W1-
      CH2: Between W2+ and W2-
      CH3: Between NE+ and NE-
      Tester Range 2 V/DIV., 20 msec/DIV.
      Condition Idle after engine warmed-up

      HINT:

      The wavelength becomes shorter as engine rpm increases.

    5. WAVEFORM 5
      Fig 6: Camshaft And Crankshaft Position Sensor Waveform
      G04967770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Camshaft position sensor and Crankshaft position sensor 

      WAVEFORM REFERENCE

      ECM Terminal Name Between G2+ and G2-
      Tester Range 2 V/DIV, 200 msec./DIV
      Condition Idle after engine warmed up

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

    6. WAVEFORM 6
      Fig 7: Vehicle Speed Signal Waveform
      G04967771Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Vehicle speed signal 

      WAVEFORM REFERENCE

      ECM Terminal Name Between SPD2+ and SPD2-
      Tester Range 5 V/DIV, 10 msec/DIV.
      Condition Driving by 40 km/h (25 mph)

      HINT:

      The wavelength becomes shorter as engine rpm increases.

    7. WAVEFORM 7
      Fig 8: Throttle Actuator Positive Terminal Waveform
      G04967772Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Throttle actuator positive terminal 

      WAVEFORM REFERENCE

      ECM Terminal Name Between M+ and ME01
      Tester Range 5 V/DIV., 1 msec/DIV.
      Condition Idle after engine warmed-up

      HINT:

      The duty ratio varies depending on the throttle opening operation.

    8. WAVEFORM 8
      Fig 9: Throttle Actuator Negative Terminal Waveform
      G04967773Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Throttle actuator negative terminal 

      WAVEFORM REFERENCE

      ECM Terminal Name Between M- and ME01
      Tester Range 5 V/DIV, 1 msec/DIV.
      Condition Idle after engine warmed-up

      HINT:

      The duty ratio varies depending on the throttle opening operation.

    9. WAVEFORM 9
      Fig 10: Igniter IGT And IGF Signal Waveform
      G04967774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM) 

      WAVEFORM REFERENCE

      ECM Terminal Name
      1. Between IGT1 (to IGT8) and E1
      2. Between IGF1 (IGF2) and E1
      Tester Range 2 V/DIV, 20 msec/DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as engine rpm increases.

    10. WAVEFORM 10
      Fig 11: Heated Oxygen (HO2) Sensor Waveform
      G04967775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Heated oxygen (HO2) sensor 

      WAVEFORM REFERENCE

      ECM Terminal Names Between OX1B and E2
      Tester Ranges 0.2 V/DIV, 200 msec/DIV.
      Conditions Engine speed maintained 2,500 rpm for 2 minutes after warming up sensor

      HINT:

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

    11. WAVEFORM 11
      Fig 12: Engine Speed Signal Waveform
      G04967776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Engine speed signal 

      WAVEFORM REFERENCE

      ECM Terminal Names Between TACH and E1
      Tester Range 5 V/DIV, 10 msec/DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as engine rpm increases.

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