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Terminals Of ECM

  1. CHECK ECM 
    Fig 1: Identifying ECM Connectors Terminals
    G05183447Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage of the ECM connectors.

      HINT:

      The standard 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 voltage for that pair of terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BATT (A9-1) - E1 (B30-81) W - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
      +BM (B30-41) - E1 (B30-81) LG - BR Power source of throttle actuator Always 11 to 14 V
      IGSW (A9-28) - E1 (B30-81) B - BR Ignition switch Ignition switch ON 11 to 14 V
      +B(A9-3) - E1 (B30-81) B - BR Power source of ECM Ignition switch ON 11 to 14 V
      +B2 (A9-2) - E1 (B30-81) B - BR Power source of ECM Ignition switch ON 11 to 14 V
      OC1+ (B30-58) - OC1- (B30-57) W - B Camshaft timing oil control valve (OCV) (Intake side (bank 1)) Ignition switch ON Pulse generation (see  bwaveform 1)
      OC2+ (B30-52) - OC2- (B30-51) BR - B Camshaft timing oil control valve (OCV) (Intake side (bank 2)) Ignition switch ON Pulse generation (see  bwaveform 1)
      OE1+ (B30-56) - OE1- (B30-55) R - LG Camshaft timing oil control valve (OCV) (Exhaust side (bank 1)) Ignition switch ON Pulse generation (see  bwaveform 1)
      OE2+ (B30-50) - OE2- (B30-49) W - B Camshaft timing oil control valve (OCV) (Exhaust side (bank 2)) Ignition switch ON Pulse generation (see  bwaveform 1)
      MREL (A9-34) - E1 (B30-81) P - BR EFI relay Ignition switch ON 11 to 14 V
      VG (B30-74) - E2G (B30-75) GR - LG Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
      THA (B30-73) - ETHA (B30-98) P - G-R Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
      THW (B30-76) - ETHW (B30-97) L - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C(176°F) 0.2 to 1.0 V
      VCTA (B30-80) - ETA (B30-79) B - W Power source for throttle position sensor (fixed voltage) Ignition switch ON 4.5 to 5.5 V
      VTA1 (B30-78) - ETA (B30-79) Y - W Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.1 V
      Ignition switch ON, Throttle valve fully open 3.3 to 4.9 V
      VTA2 (B30-77) - ETA (B30-79) GR - W Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Throttle valve fully closed 2.1 to 3.1 V
      Ignition switch ON, Throttle valve fully open 4.6 to 5.0 V
      VPA (A9-55) - EPA (A9-58) W - Y Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal released 0.5 to 1.1 V
      Ignition switch ON, Accelerator pedal fully depressed 2.6 to 4.5 V
      VPA2 (A9-56) - EPA2 (A9-60) R - P Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal released 1.2 to 2.0 V
      Ignition switch ON, Accelerator pedal fully depressed 3.4 to 5.0 V
      VCPA (A9-57) - EPA (A9-58) B - Y Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
      VCP2 (A9-59) - EPA2 (A9-60) L - P Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
      HA1A (B30-22) - E04 (B30-23) G-BR A/F sensor heater Idling Below 3.0 V
      HA2A (B30-20) - E04 (B30-23) B - BR Ignition switch ON 11 to 14 V
      A1A+ (B30-126) - E1 (B30-81) W - BR A/F sensor Ignition switch ON 3.3 V*
      A1A- (B30-125) - E1 (B30-81) BR - BR A/F sensor Ignition switch ON 3.0 V*
      A2A+ (B30-103) - E1 (B30-81) L - BR A/F sensor Ignition switch ON 3.3 V*
      A2A- (B30-102) - E1 (B30-81) Y - BR A/F sensor Ignition switch ON 3.0 V*
      HT1B (B30-45) - E03 (B30-46) LG - BR Heated oxygen sensor heater Idling Below 3.0 V
      HT2B (B30-44) - E03 (B30-46) Y - BR Ignition switch ON 11 to 14 V
      OX1B (B30-114) - EX1B (B30-115) W - GR Heated oxygen sensor Engine speed maintained at 2, 500 rpm for 2 minutes after warming up sensor Pulse generation (see  cwaveform 2)
      OX2B (B30-112) - EX2B- (B30-113) B-B - W
      #10 (B30-86) - E01 (B30-43) Y - BR Injector Ignition switch ON 11 to 14 V
      #20 (B30-109) - E01 (B30-43) W - BR Idling Pulse generation (see  dwaveform 3)
      #30 (B30-85) - E01 (B30-43) B - BR
      #40 (B30-108) - E01 (B30-43) BR - BR
      #50 (B30-84) - E01 (B30-43) L-BR
      #60 (B30-107) - E01 (B30-43) G - BR
      KNK1 (B30-94) - EKNK (B30-93) R - G Knock sensor Engine speed maintained at 4, 000 rpm after warming up engine Pulse generation (see  ewaveform 4)
      KNK2 (B30-117) - EKN2 (B30-116) B - W
      VCV1 (B30-67) - E1 (B30-81) G-R - BR Power source for VVT sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
      VCV2 (B30-66) - E1 (B30-81) V - BR Power source for VVT sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
      VV1+ (B30-90) - VV1- (B30-89) P-L - B Variable valve timing (VVT) sensor (Intake side (bank 1)) Idling Pulse generation (see  fwaveform 5)
      VV2+ (B30-87) - VV2- (B30-88) W - B Variable valve timing (VVT) sensor (Intake side (bank 2)) Idling Pulse generation (see  fwaveform 5)
      EV1+ (B30-69) - EV1- (B30-68) Y - G Variable valve timing (VVT) sensor (Exhaust side (bank 1)) Idling Pulse generation (see  gwaveform 6)
      EV2+ (B30-64) - EV2- (B30-65) R - L Variable valve timing (VVT) sensor (Exhaust side (bank 2)) Idling Pulse generation (see  gwaveform 6)
      NE+ (B30-110) - NE- (B30-111) G - R Crankshaft position sensor Idling Pulse generation (see  fwaveform 5)
      IGT1 (B30-40) - E1 (B30-81) W - BR Ignition coil (ignition signal) Idling Pulse generation (see  hwaveform 7)
      IGT2 (B30-39) - E1 (B30-81) G-R - BR
      IGT3 (B30-38) - E1 (B30-81) G - BR
      IGT4 (B30-37) - E1 (B30-81) LG - BR
      IGT5 (B30-36) - E1 (B30-81) P - BR
      IGT6 (B30-35) - E1 (B30-81) V - BR
      IGF1 (B30-104) - E1 (B30-81) Y - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
      Idling Pulse generation (see  hwaveform 7)
      PRG (B30-63) - E1 (B30-81) LG - BR Purge VSV Ignition switch ON 11 to 14 V
      Idling Pulse generation (see  iwaveform 8)
      SPD (A9-13) - E1 (B30-81) V - BR Vehicle speed signal from combination meter Driving at 20 km/h (12 mph) Pulse generation (see  jwaveform 9)
      STA (A9-46) - E1 (B30-81) LG - BR Starter signal Cranking 5.5 V or more
      NSW (B30-120) - E1 (B30-81) G-R - BR Starter relay control Ignition switch ON Below 1.5 V
      Cranking 6.0 V or more
      STP (A9-36) - E1 (B30-81) L - BR Stop light switch Brake pedal depressed 7.5 to 14 V
      Brake pedal released Below 1.5 V
      ST1-(A9-35) - E1 (B30-81) GR - BR Stop light switch (opposite to voltage at STP terminal) Ignition switch ON, Brake pedal depressed Below 1.5 V
      Ignition switch ON, Brake pedal released 7.5 to 14 V
      M+ (B30-19) - ME01 (B30-82) G - BR Throttle actuator Idling with warm engine Pulse generation (see  kwaveform 10)
      M- (B30-18) - ME01 (B30-82) R - BR Throttle actuator Idling with warm engine Pulse generation (see  lwaveform 11)
      FC (A9-52) - E1 (B30-81) W - BR Fuel pump control Ignition switch ON 11 to 14 V
      Idling Below 1.5 V
      FPR (A9-48) - E1 (B30-81) W - BR Fuel pump control Cranking 11 to 14 V
      FPR (A9-48) - E1 (B30-81) W - BR Fuel pump control Idling 11 to 14 V
      W (A9-24) - E1 (B30-81) R - BR MIL Ignition switch ON Below 1.5 V
      Idling 11 to 14 V
      TC (A9-16) - E1 (B30-81) G - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
      TACH (A9-15) - E1 (B30-81) GR - BR Engine speed Idling Pulse generation (see  mwaveform 12)
      VPMP (A9-30) - E1 (B30-81) W - BR Vent valve (built into canister pump module) Ignition switch ON 11 to 14 V
      MPMP (A9-49) - E1 (B30-81) B - BR Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3 V
      Leak detection pump ON 11 to 14 V
      VCV1 (B30-67) - ETHA (B30-98) G-R - G-R Power source for canister pressure sensor (fixed voltage) Ignition switch ON 4.5 to 5.5 V
      PPMP (B30-121) - ETHA (B30-98) L-G-R Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
      ELS1 (A9-32) - E1 (B30-81) P - BR Electric load Taillight switch ON 7.5 to 14 V
      Taillight switch OFF Below 1.5 V
      ELS2 (A9-33) - E1 (B30-81) G - BR Electric load Defogger switch ON 7.5 to 14 V
      Defogger switch OFF Below 1.5 V
      ALT (B30-32) - E1 (B30-81) P - BR Generator Ignition switch ON 11 to 14 V
      CANH (A9-10) - E1 (B30-81) Y - BR CAN communication line Ignition switch ON Pulse generation (see  nwaveform 13)
      CANL (A9-11) - E1 (B30-81) W - BR CAN communication line Ignition switch ON Pulse generation (see  owaveform 14)
      AICV (B30-61) - E1 (B30-81) B - BR VSV for air intake control system operation signal Ignition switch ON 11 to 14 V
      ACIS (B30-62) - E1 (B30-81) R - BR VSV for ACIS (Acoustic Control Induction System) operation signal Ignition switch ON 11 to 14 V
      HINT:
      *: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
    2. WAVEFORM 1

      Camshaft timing oil control valve (OCV) 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between OC1+ and OC1-
      Between OC2+ and OC2-
      Between OE1+ and OE1-
      Between OE2+ and OE2-
      Tester Range 5 V/DIV., 1 msec./DIV.
      Condition Idling
      Fig 2: Camshaft Timing Oil Control Valve (OCV) Waveform
      G04828019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. WAVEFORM 2

      Heated oxygen sensor 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between OX1B and EX1B
      Between OX2B and EX2B
      Tester Range 0.2 V/DIV., 200 msec./DIV.
      Condition Engine speed maintained at 2, 500 rpm for 2 minutes after warming up sensor

      HINT:

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

      Fig 3: Heated Oxygen Sensor Waveform
      G04828020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. WAVEFORM 3

      Injector No. 1 (to No. 6) injection signal 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between #10 (to #60) and E01
      Tester Range 20 V/DIV., 20 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 4: Injector No. 1 (To No. 6) Injection Signal Waveform
      G04828021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. WAVEFORM 4

      Knock sensor 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between KNK1 and EKNK
      Between KNK2 and EKN2
      Tester Range 1 V/DIV., 1 msec./DIV.
      Condition Engine speed maintained at 4, 000 rpm after warming up engine

      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 Waveform
        G04828022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. WAVEFORM 5

      Crankshaft position sensor and camshaft position sensor 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between NE+ and NE-
      Between VV1+ and VV1-
      Between VV2+ and VV2-
      Tester Range 5 V/DIV., 20 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 6: Crankshaft Position Sensor And Camshaft Position Sensor Waveform
      G05183894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. WAVEFORM 6

      Crankshaft position sensor and camshaft position sensor 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between NE+ and NE-
      Between EV1+ and EV1-
      Between EV2+ and EV2-
      Tester Range 5 V/DIV., 20 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 7: Crankshaft Position Sensor And Camshaft Position Sensor Waveform
      G05285034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. WAVEFORM 7

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

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between IGT (1 to 6) and E1
      Between IGF1 and E1
      Tester Range 2 V/DIV., 20 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 8: Igniter IGT Signal Waveform
      G05183895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. WAVEFORM 8

      Purge VSV 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between PRG and E1
      Tester Range 5 V/DIV., 50 msec./DIV.
      Condition Idling

      HINT:

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

      Fig 9: Purge VSV Waveform
      G04828025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. WAVEFORM 9

      Vehicle speed signal 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between SPD and E1
      Tester Range 2 V/DIV., 20 msec./DIV.
      Condition Driving at 20 km/h (12 mph)

      HINT:

      The wavelength becomes shorter as the vehicle speed increases.

      Fig 10: Vehicle Speed Signal Waveform
      G04828026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. WAVEFORM 10

      Throttle actuator positive terminal 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between M+ and ME01
      Tester Range 5 V/DIV., 1 msec./DIV.
      Condition Idling with warm engine

      HINT:

      The duty ratio varies depending on the throttle actuator operation.

      Fig 11: Throttle Actuator Positive Terminal Waveform
      G04828027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. WAVEFORM 11

      Throttle actuator negative terminal 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between M- and ME01
      Tester Range 5 V/DIV., 1 msec./DIV.
      Condition Idling with warm engine

      HINT:

      The duty ratio varies depending on the throttle actuator operation.

      Fig 12: Throttle Actuator Negative Terminal Waveform
      G04828028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. WAVEFORM 12

      Engine speed signal 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between TACH and E1
      Tester Range 5 V/DIV., 10 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 13: Engine Speed Signal Waveform
      G04828029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    14. WAVEFORM 13

      CAN communication signal 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between CANH and E1
      Tester Range 1 V/DIV., 10 μsec/DIV.
      Condition Engine stopped and ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 14: CAN Communication Signal Waveform
      G04828030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    15. WAVEFORM 14

      CAN communication signal 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between CANL and E1
      Tester Range 1 V/DIV., 10 μsec./DIV.
      Condition Engine stopped and ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 15: CAN Communication Signal Waveform
      G04828031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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