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Terminals Of ECM

  1. ECM 
    Fig 1: Identifying ECM Connector Terminals
    G05263951Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    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 graphic shown above can be used as a reference to identify the ECM terminal locations.

    VOLTAGE REFERENCE TABLE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition STD Voltage
    BATT (E9-3) - E1 (E7-1) L - BR Battery (for measuring the battery voltage and for the ECM memory) Always 9 to 14 V
    +BM (E9-7) - E1 (E7-1) L-B - BR Power source of throttle motor Always 9 to 14 V
    IGSW (E9-9) - E1 (E7-1) B-O - BR Ignition switch Ignition switch ON 9 to 14 V
    +B (E9-1) - E1 (E7-1) B - BR Power source of ECM Ignition switch ON 9 to 14 V
    +B2 (E9-2) - E1 (E7-1) B - BR Power source of ECM Ignition switch ON 9 to 14 V
    MREL (E9-8) - E1 (E7-1) W-G - BR EFI relay Ignition switch ON 9 to 14 V
    VC (E5-23) - E2 (E5-28) LG-B - BR Power source for sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
    VG (E5-30) - E2 (E5-28) W-R - BR Mass air flow meter Idling, shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
    THA (E5-22) - E2 (E5-28) B-R - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
    THW (E5-21) - E2 (E5-28) R-L - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
    VTA1 (E5-20) - E2 (E5-28) Y - BR Throttle position sensor (for engine control) Ignition switch ON, throttle valve fully closed 0.5 to 1.2 V
    VTA1 (E5-20) - E2 (E5-28) Y - BR Throttle position sensor (for engine control) Ignition switch ON, throttle valve fully open 3.2 to 4.8 V
    VTA2 (E5-19) - E2 (E5-28) R-B - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully open 2.1 to 3.1 V
    VTA2 (E5-19) - E2 (E5-28) R-B - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully open 4.5 to 5.5 V
    VPA (E9-18) - EPA (E9-20) W-L - BR-W Accelerator pedal position sensor (for engine control) Ignition switch ON, throttle valve fully closed 0.5 to 1.1 V
    VPA (E9-18) - EPA (E9-20) W-L - BR-W Accelerator pedal position sensor (for engine control) Ignition switch ON, throttle valve fully open 2.6 to 4.5 V
    VPA2 (E9-19) - EPA2 (E9-21) GR-G - BR-Y Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully closed 1.2 to 2.0 V
    VPA2 (E9-19) - EPA2 (E9-21) GR-G - BR-Y Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully open 3.4 to 5.3 V
    VCPA (E9-26) - EPA (E9-20) LG-R - BR-W Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
    VCP2 (E9-27) - EPA2 (E9-21) BR-R - BR-Y Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
    OC1+ (E7-17) - OC1-(E7-16) BR - GR Camshaft timing oil control valve (OCV) Idling Pulse generation (See  cwaveform 3)
    OC2+ (E7-15) - OC2-(E7-14) L-R - LG Camshaft timing oil control valve (OCV) Idling Pulse generation (See  cwaveform 3)
    VV1+ (E7-25) - VV1- (E7-24) P(1)-V(1) Variable valve timing (VVT) sensor (Bank 1) Idling Pulse generation (See  dwaveform 4)
    VV2+ (E7-18) - VV2- (E7-28) R(1)-G(1) Variable valve timing (VVT) sensor (Bank 2) Idling Pulse generation (See  dwaveform 4)
    M+ (E5-5) - E1 (E7-1) R(1) - BR Throttle motor Idling Pulse generation (See  gwaveform 7)
    M- (E5-4) - E1 (E7-1) G(1) - BR Throttle motor Idling Pulse generation (See  hwaveform 8)
    A1A+ (E6-22) - E1 (E7-1) Y(1) - BR A/F sensor Ignition switch ON -
    A1A- (E6-30) - E1 (E7-1) L(1) - BR A/F sensor Ignition switch ON -
    A2A+ (E6-23) - E1 (E7-1) P(1) - BR A/F sensor Ignition switch ON -
    A2A- (E6-31) - E1 (E7-1) V(1) - BR A/F sensor Ignition switch ON -
    HA1A (E6-2) - E1 (E7-1) B-W - BR A/F sensor heater Idling -
    HA2A (E6-1) - E1 (E7-1) R-L - BR A/F sensor heater Ignition switch ON -
    OX1B (E5-18) - E1 (E7-1) B(1) - BR Heated oxygen sensor Maintain engine speed at 2,500 rpm for 2 minutes after warming up Pulse generation (See  jwaveform 10)
    OX2B (E6-33) - E1 (E7-1) W(1) - BR
    HT1B (E5-1) - E1 (E7-1) G-Y - BR Heated oxygen sensor heater Idling Below 3.0 V
    HT2B (E6-5) - E1 (E7-1) P - BR
    HT1B (E5-1) - E1 (E7-1) G-Y - BR Heated oxygen sensor heater Ignition switch ON 9 to 14 V
    HT2B (E6-5) - E1 (E7-1) P - BR
    #1 (E7-2) - E01 (E5-7) R-L - W-B Injector Ignition switch ON 9 to 14 V
    #2 (E7-3) - E01 (E5-7) L - W-B
    #3 (E7-4) - E01 (E5-7) R - W-B
    #4 (E7-5) - E01 (E5-7) Y - W-B
    #5 (E7-6) - E01 (E5-7) G - W-B
    #6 (E7-7) - E01 (E5-7) R - W-B
    #7 (E5-3) - E01 (E5-7) W - W-B
    #8 (E5-2) - E01 (E5-7) R-B - W-B
    #1 (E7-2) - E01 (E5-7) R-L - W-B Injector Idling Pulse generation (See  awaveform 1)
    #2 (E7-3) - E01 (E5-7) L - W-B
    #3 (E7-4) - E01 (E5-7) R - W-B
    #4 (E7-5) - E01 (E5-7) Y - W-B
    #5 (E7-6) - E01 (E5-7) G - W-B
    #6 (E7-7) - E01 (E5-7) R - W-B
    #7 (E5-3) - E01 (E5-7) W - W-B
    #8 (E5-2) - E01 (E5-7) R-B - W-B
    KNK1 (E6-29) - EKNK (E6-28) W(1) - B(1) Knock sensor Maintain engine speed at 4,000 rpm after warming up Pulse generation (See  bwaveform 2)
    KNK2 (E6-21) - EKN2 (E6-20) G(1) - R(1) Knock sensor Maintain engine speed at 4,000 rpm after warming up Pulse generation (See  bwaveform 2)
    G2+ (E7-19) - G2- (E7-29) R(1) - G(1) Camshaft position sensor Idling Pulse generation (See  ewaveform 5)
    NE+ (E7-21) - NE- (E7-20) B(1) - W(1) Crankshaft position sensor Idling Pulse generation (See  ewaveform 5)
    PRG (E5-34) - E1 (E7-1) Y-R - BR VSV for EVAP Ignition switch ON 9 to 14 V
    SPD (E8-8) - E1 (E7-1) V-R - BR Speed signal from combination meter Ignition switch ON, Rotate driving wheel slowly Pulse generation (See  fwaveform 6)
    FPR (E7-30) - E1 (E7-1) G-R - BR Fuel pump relay Ignition switch ON 0 to 3.0 V
    FC (E9-10) - E1 (E7-1) GR-B - BR Fuel pump control Ignition switch ON 9 to 14 V
    IGT1 (E5-8) - E1 (E7-1) B-Y - BR Ignition coil with igniter (ignition signal) Idling Pulse generation (See  iwaveform 9)
    IGT2 (E5-15) - E1 (E7-1) L-Y - BR
    IGT3 (E5-11) - E1 (E7-1) G-O - BR
    IGT4 (E5-10) - E1 (E7-1) L-B - BR
    IGT5 (E5-13) - E1 (E7-1) G-R - BR
    IGT6 (E5-12) - E1 (E7-1) G - BR
    IGT7 (E5-14) - E1 (E7-1) G-W - BR
    IGT8 (E5-9) - E1 (E7-1) G-B - BR
    IGF1 (E5-24) - E1 (E7-1) R-Y - BR Ignition coil with igniter (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
    IGF2 (E5-25) - E1 (E7-1) R-W - BR
    IGF1 (E5-24) - E1 (E7-1) R-Y - BR Ignition coil with igniter (ignition confirmation signal) Idling Pulse generation (See  iwaveform 9)
    IGF2 (E5-25) - E1 (E7-1) R-W - BR
    STP (E9-15) - E1 (E7-1) G-Y - BR Stop light switch Brake pedal depressed 7.5 to 14 V
    STP (E9-15) - E1 (E7-1) G-Y - BR Stop light switch Brake pedal released Below 1.5 V
    ST1- (E9-16) - E1 (E7-1) R-L - BR Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal depressed Below 1.5 V
    ST1- (E9-16) - E1 (E7-1) R-L - BR Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal released 7.5 to 14 V
    NSW/STAR (E6-8) - E1 (E7-1) L-Y - BR Park/Neutral position switch Ignition switch ON, Shift lever position other than P and N 9 to 14 V
    NSW/STAR (E6-8) - E1 (E7-1) L-Y - BR Park/Neutral position switch Ignition switch ON, Shift lever position in P, N Below 3.0 V
    W (E8-30) - E1 (E7-1) R-B - BR MIL Idling 9 to 14 V
    W (E8-30) - E1 (E7-1) R-B - BR MIL Ignition switch ON Below 3.0 V
    ELS (E8-13) - E1 (E7-1) G - BR Electric load Taillight switch ON, Defogger switch ON 7.5 to 14 V
    ELS (E8-13) - E1 (E7-1) G - BR Electric load Taillight switch OFF, Defogger switch OFF 0 to 1.5 V
    TACH (E8-1) - E1 (E7-1) B-W - BR Engine speed Idling Pulse generation (See  kwaveform 11)
    TC (E9-23) - E1 (E7-1) P-L - BR Terminal TC of DLC3 Ignition switch ON 9 to 14 V
    STA (E7-11) - E1 (E7-1) B-Y - BR Starter signal Cranking 6 V or higher
    STA (E7-11) - E1 (E7-1) B-Y - BR Park/neutral position switch Shift lever position P or N, Ignition switch START 9 to 14 V
    STSW (E7-12) - E1 (E7-1) L-Y - BR STA No. 2 fuse Shift lever position P or N, Ignition switch START 9 to 14 V
    VPMP (E9-5) - E1 (E7-1) L-W - BR Canister closed valve Ignition switch ON 9 V to 14 V
    MPMP (E9-6) - E1 (E7-1) G-Y - BR Leak detection pump Vacuum pump OFF 0 V to 3 V
    MPMP (E9-6) - E1 (E7-1) G-Y - BR Leak detection pump Vacuum pump ON 9 V to 14 V
    PPMP (E9-22) - E1 (E7-1) O - BR Vapor pressure sensor Ignition switch ON 3 V to 3.6 V
    AIV1 (E5-27) - E1 (E7-1) G - BR VSV for air injection control (Bank 1) Ignition switch ON 9 to 14 V
    AIV2 (E5-26) - E1 (E7-1) R - BR VSV for air injection control (Bank 2) Ignition switch ON 9 to 14 V
    AIRV (E9-4) - E1 (E7-1) L - BR Al driver (ASV control signal) Ignition switch ON 9 to 14 V
    AIRP (E9-25) - E1 (E7-1) Y - BR Al driver (Air pump control signal) Ignition switch ON 9 to 14 V
    AIP (E5-32) - E1 (E7-1) W-L - BR Air pressure sensor Ignition switch ON 3 V to 3.6 V
    (1) : Shielded
    1. WAVEFORM 1
      Fig 2: Identifying Fuel Injector - Waveform 1
      G04967766Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Fuel injector 

      FUEL INJECTOR WAVEFORM REFERENCE

      ECM Terminal Names Between #1 (to #8) 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: Identifying Knock Sensor - Waveform 2
      G05263953Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Knock sensor 

      KNOCK SENSOR WAVEFORM REFERENCE

      ECM Terminal Name Between KNK1 and EKNK
      Between KNK2 and EKN2
      Tester Range 1 V/DIV., 1 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: Identifying Camshaft Timing Oil Control Valve (OCV) - Waveform 3
      G04967768Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Camshaft timing oil control valve (OCV) 

      CAMSHAFT TIMING OIL CONTROL VALVE 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.

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

    4. WAVEFORM 4
      Fig 5: Identifying Variable Valve Timing (VVT) Sensor (Bank 1, 2) & Crankshaft Position Sensor - Waveform 4
      G04967769Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

      VALVE TIMING AND CRANKSHAFT POSITION SENSOR WAVEFORM REFERENCE

      ECM Terminal Name CH1: Between VV1+ and VV1-
      CH2: Between VV2+ and VV2-
      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: Identifying Camshaft Position Sensor & Crankshaft Position Sensor - Waveform 5
      G05263956Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Camshaft position sensor and Crankshaft position sensor 

      CAMSHAFT POSITION SENSOR AND CRANKSHAFT 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: Identifying Vehicle Speed Signal - Waveform 6
      G04967771Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Vehicle speed signal 

      VEHICLE SPEED SIGNAL WAVEFORM REFERENCE

      ECM Terminal Name Between SPD and E1
      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: Identifying Throttle Actuator Positive Terminal - Waveform 7
      G04967772Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Throttle actuator positive terminal 

      THROTTLE ACTUATOR POSITIVE TERMINAL WAVEFORM REFERENCE

      ECM Terminal Name Between M+ and E1
      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: Identifying Throttle Actuator Negative Terminal - Waveform 8
      G04967773Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Throttle actuator negative terminal 

      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: Identifying Igniter IGT Signal & Igniter IGF Signal Waveform 9
      G04967774Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

      IGNITER IGT SIGNAL 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: Identifying Heated Oxygen (HO2) Sensor - Waveform 10
      G04967775Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Heated oxygen (HO2) sensor 

      HEATED OXYGEN (HO2) SENSOR WAVEFORM REFERENCE

      ECM Terminal Names Between OX1B (OX2B ) 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: Identifying Engine Speed Signal - Waveform 11
      G04967776Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Engine speed signal 

      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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