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Terminals Of ECM

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

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

      ECM TERMINALS REFERENCE

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BATT (A9-20) - E1 (B30-81) W - BR Battery (for measuring battery voltage and for ECM memory) Always 9 to 14 V
      +BM (A9-3) - E1 (B30-81) LG - BR Power source of throttle actuator Always 9 to 14 V
      IGSW (A9-28) - E1 (B30-81) B - BR Ignition switch Ignition switch ON 9 to 14 V
      +B(A9-2) - E1 (B30-81) B - BR Power source of ECM Ignition switch ON 9 to 14 V
      +B2(A9-1) - E1 (B30-81) B - BR Power source of ECM Ignition switch ON 9 to 14 V
      OC1+ (B30-58) - OC1- (B30-57) W - B Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see waveform 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 waveform 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 waveform 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 waveform 1)
      MREL (A9-44) - E1 (B30-81) O - BR EFI relay Ignition switch ON 9 to 14 V
      VG (B30-72) - E2G (B30-73) GR - L-G Mass air flow meter Idling, Shift lever position P or N, A/ C switch OFF 0.5 to 3.0 V
      THA (B30-71) - ETHA (B30-74) P - G-R Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
      THW (B30-79) - ETHW (B30-78) L - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
      VCTA (B30-96) - ETA (B30-97) B - W Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
      VTA1 (B30-98) - ETA (B30-97) 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 (B30-99) - ETA (B30-97) 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 (A9-59) 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 - O Accelerator pedal position sensor (for sensor malfunctioning 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 (A9-59) B - Y Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
      VCP2 (A9-58) - EPA2 (A9-60) L - O Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
      HA1A (B30-86) - E04 (B30-23)
      HA2A (B30-109) - E04 (B30-23)      		 G - BR
      B - BR      		 A/F sensor heater Idling Below 3.0 V
      Ignition switch ON 9 to 14 V
      A1A+ (B30-93) - E1 (B30-81) W - BR A/F sensor Ignition switch ON 3.3 V*
      A1A- (B30-116) - E1 (B30-81) BR - BR A/F sensor Ignition switch ON 3.0 V*
      A2A+ (B30-120) - E1 (B30-81) L - BR A/F sensor Ignition switch ON 3.3 V*
      A2A-(B30-119) - E1 (B30-81) Y - BR A/F sensor Ignition switch ON 3.0 V*
      HT1B (B30-48) - E03 (B30-104)
      HT2B (B30-47) - E03 (B30-104)      		 LG - BR
      Y - BR      		 Heated oxygen sensor heater Idling Below 3.0 V
      Ignition switch ON 9 to 14 V
      OX1B (B30-88) - EX1B (B30-65)
      OX2B (B30-87) - EX2B- (B30-64)      		 W - GR
      B - B-W      		 Heated oxygen sensor Engine speed maintained at 2, 500 rpm for 2 minutes after warming up sensor Pulse generation (see waveform 2)
      #10 (B30-45) - E01 (B30-22)
      #20 (B30-85) - E01 (B30-22)
      #30 (B30-44) - E01 (B30-22)
      #40 (B30-84) - E01 (B30-22)
      #50 (B30-43) - E01 (B30-22)
      #60(B30-83) - E01(B30-22)      		 Y - BR
      W - BR
      B - BR
      BR - BR
      L - BR
      G - BR      		 Injector Ignition switch ON 9 to 14 V
      Idling Pulse generation (see waveform 3)
      KNK1 (B30-95) - EKNK (B30-94)
      KNK2 (B30-118) - EKN2 (B30-117)      		 R - G
      B - W      		 Knock sensor Engine speed maintained at 4, 000 rpm after warming up engine Pulse generation (see waveform 4)
      VCV1 (B30-115) - E1 (B30-81) G-R - BR Power source for VVT sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
      VCV2 (B30-113) - E1 (B30-81) V - BR Power source for VVT sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
      VCE1 (B30-114) - E1 (B30-81) GR - BR Power source for VVT sensor specific voltage) Ignition switch ON 4.5 to 5.0 V
      VCE2 (B30-112) - E1 (B30-81) Y - BR Power source for VVT sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
      VV1+ (B30-69) - VV1- (B30-92) P - L-B Variable valve timing (VVT) sensor (Intake side (bank 1)) Idling Pulse generation (see waveform 5)
      VV2+ (B30-67) - VV2- (B30-90) W - B Variable valve timing (VVT) sensor (Intake side (bank 2)) Idling Pulse generation (see waveform 5)
      EV1+ (B30-68) - EV1- (B30-91) Y - G Variable valve timing (VVT) sensor (Exhaust side (bank 1)) Idling Pulse generation (see waveform 5)
      EV2+ (B30-66) - EV2- (B30-89) R - L Variable valve timing (VVT) sensor (Exhaust side (bank 2)) Idling Pulse generation (see waveform 5)
      NE+ (B30-110) - NE- (B30-111) G - R Crankshaft position sensor Idling Pulse generation (see waveform 5)
      IGT1 (B30-40) - E1 (B30-81)
      IGT2 (B30-39) - E1 (B30-81)
      IGT3 (B30-38) - E1 (B30-81)
      IGT4 (B30-37) - E1 (B30-81)
      IGT5(B30-36) - E1(B30-81)
      IGT6 (B30-35) - E1 (B30-81)      		 W - BR
      G-R - BR
      G - BR
      LG - BR
      P - BR
      V - BR      		 Ignition coil (ignition signal) Idling Pulse generation (see waveform 6)
      IGF1 (B30-106) - E1 (B30-81) Y - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
      Idling Pulse generation (see waveform 6)
      PRG (B30-108) - E1 (B30-81) LG - BR Purge VSV Ignition switch ON 9 to 14 V
      Idling Pulse generation (see waveform 7)
      SPD(A9-8) - E1 (B30-81) V - BR Speed signal from combination meter Driving at 20 km/h (12 mph) Pulse generation (see waveform 8)
      STA (A9-48) - E1 (B30-81) LG - BR Starter signal Cranking 5.5 V or more
      STAR (B30-62) - 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 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 (B30-20) G - BR Throttle actuator Idling with warm engine Pulse generation (see waveform 9)
      M- (B30-18) - ME01 (B30-20) R - BR Throttle actuator Idling with warm engine Pulse generation (see waveform 10)
      FC(A9-7) - E1 (B30-81) W - BR Fuel pump control Ignition switch ON 9 to 14 V
      Idling Below 1.5 V
      FPR (B30-59) - E1 (B30-81) W - BR Fuel pump control Cranking 9 to 14 V
      FPR (B30-59) - E1 (B30-81) W - BR Fuel pump control Idling 9 to 14 V
      W(A9-24) - E1 (B30-81) R - BR MIL Ignition switch ON Below 1.5 V
      Idling 9 to 14 V
      TC(A9-27) - E1 (B30-81) G - BR Terminal TC of DLC3 Ignition switch ON 9 to 14 V
      TACH(A9-15) - E1 (B30-81) GR - BR Engine speed Idling Pulse generation (see waveform 11)
      VPMP (A9-42) - E1 (B30-81) W - BR Vent valve (built into canister pump module) Ignition switch ON 9 to 14 V
      MPMP (A9-34) - E1 (B30-81) B - BR Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3 V
      Leak detection pump ON 9 to 14 V
      VCPP (B30-75) - EPPM (B30-76) V - BR Power source for canister pressure sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
      PPMP (B30-77) - EPPM (B30-76) L - BR Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
      ELS(A9-31) - E1 (B30-81) O - 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 9 to 14 V
      CANH(A9-41) - E1 (B30-81) Y - BR CAN communication line Ignition switch ON Pulse generation (see waveform 12)
      CANL (A9-49) - E1 (B30-81) W - BR CAN communication line Ignition switch ON Pulse generation (see waveform 13)
      VCIB (B30-80) - EIB (B30-101) LG - P Battery current sensor Ignition switch ON 4.5 to 5.5 V
      IB(B30-100) - EIB(B30-101) R - P Battery current sensor Ignition switch ON 0.5 to 2.5 V
      THB (B30-103) - EIB (B30-101) G-R - P Battery temperature sensor Ignition switch ON, battery temperature -30 to 80°C (-22 to 176°F) 0.5 to 4.5 V
      RLO(B30-31) - E1 (B30-81) Y - BR Generator After engine warmed up, during charging control, vehicle driven at constant speed Pulse generation (see waveform 14)
      RLO(B30-31) - E1 (B30-81) Y - BR Generator After engine warmed up, during charging control, vehicle accelerated Pulse generation (see waveform 15)
      RLO(B30-31) - E1 (B30-81) Y - BR Generator After engine warmed up, during charging control, vehicle decelerated Pulse generation (see waveform 16)
      AICV (A9-4) - E1 (B30-81) L - BR VSV for air intake control system operation signal Ignition switch ON 9 to 14 V
      ACIS (B30-107) - E1 (B30-81) R - BR VSV for ACIS (Acoustic Control Induction System) operation signal Ignition switch ON 9 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: Identifying Waveform 1
      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 B1 S2 shows the ECM input values from the heated oxygen sensor.

      Fig 3: Identifying Waveform 2
      G04828020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. WAVEFORM 3

      Injector No. 1 (to No. 4) injection signal 

      WAVEFORM REFERENCE

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

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 4: Identifying Waveform 3
      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: Identifying Waveform 4
      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 EV1+ and EV1-
      Between VV2+ and VV2-
      Between EV2+ and EV2-
      Tester Range 5 V/DIV., 20 msec./DIV.
      Condition Idling
      Fig 6: Identifying Waveform 5
      G05183894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

    7. WAVEFORM 6

      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 7: Identifying Waveform 6
      G05183895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. WAVEFORM

      7 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 8: Identifying Waveform 7
      G04828025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. WAVEFORM 8

      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 9: Identifying Waveform 8
      G04828026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. WAVEFORM 9

      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 10: Identifying Waveform 9
      G04828027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. WAVEFORM 10

      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 11: Identifying Waveform 10
      G04828028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. WAVEFORM 11

      Engine speed signal 

      WAVEFORM REFERENCE

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

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 12: Identifying Waveform 11
      G04828029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. WAVEFORM 12

      CAN communication signal 

      WAVEFORM REFERENCE

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

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 13: Identifying Waveform 12
      G04828030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    14. WAVEFORM 13

      CAN communication signal 

      WAVEFORM REFERENCE

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

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 14: Identifying Waveform 13
      G04828031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    15. WAVEFORM 14

      Generator 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between RLO and E1
      Tester Range 2 V/DIV., 50 msec./DIV.
      Condition After engine warmed up, during charging control, vehicle driven at constant speed

      HINT:

      A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.

      Fig 15: Identifying Waveform 14
      G05183903Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    16. WAVEFORM 15

      Generator 

      WAVEFORM REFERENCE

      Symbol (Terminal No.) Between RLO and E1
      Tester Range 2 V/DIV., 50 msec./DIV.
      Condition After engine warmed up, during charging control, vehicle accelerated

      HINT:

      A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.

      Fig 16: Identifying Waveform 15
      G05183904Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    17. WAVEFORM 16

Generator 

WAVEFORM REFERENCE

Symbol (Terminal No.) Between RLO and E1
Tester Range 2 V/DIV., 50 msec./DIV.
Condition After engine warmed up, during charging control, vehicle decelerated

HINT:

A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.

Fig 17: Identifying Waveform 16
G05183905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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