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Terminals Of ECM

  1. CHECK ECM 
    Fig 1: Identifying ECM Terminals
    G05149657Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage according to the value (s) in the table below.

      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 VOLTAGE SPECIFICATION

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      A24-1 (BATT) - D74-81 (E1) L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
      D74-41 (+BM) - D74-81 (E1) P - BR Power source of throttle actuator Always 11 to 14 V
      A24-28 (IGSW) - D74-81 (E1) LG - BR Ignition switch Ignition switch ON 11 to 14 V
      A24-3 (+B) - D74-81 (E1) GR - BR Power source of ECM Ignition switch ON 11 to 14 V
      A24-2 (+B2) - D74-81 (E1) GR - BR Power source of ECM Ignition switch ON 11 to 14 V
      D74-58 (OC1+) - D74-57 (OC1-) B - B-L Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see  bwaveform 1)
      D74-52 (OC2+) - D74-51 (OC2-) L-B - R-B Camshaft timing oil control valve (OCV) (Intake side (for bank 2)) Ignition switch ON Pulse generation (see  bwaveform 1)
      A24-34 (MREL) - D74-81 (E1) W - BR EFI relay Ignition switch ON 11 to 14 V
      D74-74 (VG) - D74-75 (E2G) L-Y - G-W Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
      D74-73 (THA) - D74-97 (ETHW) Y-B - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
      D74-76 (THW) - D74-97 (ETHW) G-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
      D74-80 (VCTA) - D74-79 (ETA) L - Y Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
      D74-78 (VTA1) - D74-79 (ETA) R-Y - Y Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.2 V
      Ignition switch ON, Throttle valve fully open 3.2 to 4.8 V
      D74-77 (VTA2) - D74-79 (ETA) Y-B - Y 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 4.5 to 5.5 V
      A24-55 (VPA) - A24-58 (EPA) W - O 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
      A24-56 (VPA2) - A24-60 (EPA2) LG - BR 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 5.3 V
      A24-57 (VCPA) - A24-58 (EPA) B - O Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
      A24-59 (VCP2) - A24-60 (EPA2) V - BR Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
      D74-22 (HA1A) - D74-23 (E04)
      D74-20 (HA2A) - D74-21 (E05)      		 L - W-B
      G - W-B      		 A/F sensor heater Idling Below 3.0 V
      Ignition switch ON 11 to 14 V
      D74-126 (A1A+)-D74-81 (E1) G - BR A/F sensor Ignition switch ON 3.3 V*
      D74-125 (A1A-)-D74-81 (E1) R - BR A/F sensor Ignition switch ON 2.9 V*
      D74-103 (A2A+)-D74-81 (E1) P - BR A/F sensor Ignition switch ON 3.3 V*
      D74-102 (A2A-)-D74-81 (E1) L - BR A/F sensor Ignition switch ON 2.9 V*
      D74-45 (HT1B)-D74-46 (E03)
      D74-44 (HT2B) - D74-46 (E03)      		 G-B - W-B
      B - W-B      		 Heated oxygen sensor heater Idling Below 3.0 V
      Ignition switch ON 11 to 14 V
      D74-114 (OX1B)-D74-115 (EX1B)
      D74-112 (OX2B)-D74-113 (EX2B)      		 W - BR
      B - BR      		 Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor Pulse generation (see  cwaveform 2)
      D74-86 (#10) - D74-43 (E01)
      D74-109 (#20) - D74-43 (E01)
      D74-85 (#30) - D74-43 (E01)
      D74-108 (#40) - D74-43 (E01)
      D74-84 (#50) - D74-43 (E01)
      D74-107 (#60) - D74-43 (E01)
      D74-83 (#70) - D74-43 (E01)
      D74-106 (#80) - D74-43 (E01)      		 R-L - W-B
      L - W-B
      R - W-B
      Y - W-B
      G - W-B
      R - W-B
      W - W-B
      R-B - W-B      		 Injector Ignition switch ON 11 to 14 V
      Idling Pulse generation (see  dwaveform 3)
      D74-94 (KNK1)-D74-93 (EKNK)
      D74-117 (KNK2)-D74-116 (EKN2)      		 G - R
      W - B      		 Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation (see  ewaveform 4)
      D74-92 (VV1+)-D74-91 (VV1-) R - G Variable valve timing (VVT) sensor (Intake side (for bank 1)) Idling Pulse generation (see  fwaveform 5)
      D74-87 (VV2+) - D74-88 (VV2-) R - W Variable valve timing (VVT) sensor (Intake side (for bank 2)) Idling Pulse generation (see  fwaveform 5)
      D74-110 (NE+)-D74-111 (NE-) L - G Crankshaft position sensor Idling Pulse generation (see  fwaveform 5)
      D74-40 (IGT1)-D74-81 (E1)
      D74-33 (IGT2) - D74-81 (E1)
      D74-37 (IGT3) - D74-81 (E1)
      D74-38 (IGT4) - D74-81 (E1)
      D74-35 (IGT5) - D74-81 (E1)
      D74-36 (IGT6) - D74-81 (E1)
      D74-34 (IGT7) - D74-81 (E1)
      D74-39 (IGT8) - D74-81 (E1)      		 B-Y - BR
      L-Y - BR
      B-BR
      L-B - BR
      G-R - BR
      G-BR
      G-W - BR
      G-B - BR      		 Ignition coil (ignition signal) Idling Pulse generation (see  gwaveform 6)
      D74-104 (IGF1)-D74-81 (E1) G-B - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
      Idling Pulse generation (see  gwaveform 6)
      D74-105 (IGF2)-D74-81 (E1) R - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
      Idling Pulse generation (see  gwaveform 6)
      D74-63 (PRG) - D74-81 (E1) L-B - BR Purge VSV Ignition switch ON 11 to 14 V
      Idling Pulse generation (see  hwaveform 7)
      A24-13 (SPD)-D74-81 (E1) R - BR Speed signal from combination meter Driving at 20 km/h (12 mph) Pulse generation (see  iwaveform 8)
      A24-46 (STA) - D74-81 (E1) R - BR Starter signal Cranking 5.5 V or more
      D74-120 (NSW)-D74-81 (E1) L - BR Park / neutral position switch Ignition switch ON, Shift lever position other than P and N 11 to 14 V
      Ignition switch ON, Shift lever position in P or N Below 3.0 V
      A24-36 (STP) - D74-81 (E1) LG - BR Stop light switch Brake pedal depressed 7.5 to 14 V
      Brake pedal released Below 1.5 V
      A24-35 (ST1-) - D74-81 (E1) R - 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
      D74-19 (M+) - D74-82 (ME01) R - W-B Throttle actuator Idling with warm engine Pulse generation (see  jwaveform 9)
      D74-18 (M-) - D74-82 (ME01) G - W-B Throttle actuator Idling with warm engine Pulse generation (see  kwaveform 10)
      A24-48 (FC) - D74-81 (E1) L - BR Fuel pump control Ignition switch ON 11 to 14 V
      A24-52 (FPC) - D74-81 (E1) O - BR Fuel pump control Ignition switch ON Below 1.5 V
      A24-24 (W) - D74-81 (E1) P - BR MIL Ignition switch ON Below 3.0 V
      Idling 11 to 14 V
      A24-16 (TC) - D74-81 (E1) R - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
      A24-15 (TACH) - D74-81 (E1) W - BR Engine speed Idling Pulse generation (see  lwaveform 11)
      A24-30 (VPMP) - D74-81 (E1) V - BR Vent valve (built into canister pump module) Ignition switch ON 11 to 14 V
      A24-49 (MPMP) - D74-81 (E1) G - BR Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3.0 V
      Leak detection pump ON 11 to 14 V
      D74-66 (VC) - D74-97 (ETHW) L - BR Power source for sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
      D74-121 (PPMP) - D74-97 (ETHW) P - BR Canister pressure sensor (built into canister pump module) Ignition switch ON 3.3 to 4.0 V
      D74-32 (ALT) - D74-81 (E1) R - BR Generator Ignition switch ON 11 to 14 V
      A24-10 (CANH) - D74-81 (E1) GR - BR CAN communication line Ignition switch ON Pulse generation (see  mwaveform 12)
      A24-11 (CANL) - D74-81 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (see  nwaveform 13)
      D74-62 (ACIS) - D74-81 (E1) R-W - BR VSV for ACIS (Acoustic Control Induction System) operation signal Ignition switch ON 11 to 14 V
      D74-28 (AIRV) - D74-81 (E1) BR - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
      D74-54 (AIRP) - D74-81 (E1) P - BR Air pump control Ignition switch ON 11 to 14 V
      D74-30 (AIDI) - D74-81 (E1) G - BR Diagnostic information signal for air injection system Air injection system operates Pulse generation (see  pwaveform 15)
      A24-54 (AIP) - D74-98 (ETHA) Y - BR Secondary air injection system pressure signal Ignition switch ON 3.0 to 3.6 V
      A24-43 (ARV2) - D74-81 (E1) V - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
      D74-53 (ARP2) - D74-81 (E1) P-L - BR Air pump control Ignition switch ON 11 to 14 V
      D74-29 (AID2) - D74-81 (E1) G - BR Diagnostic information signal for air injection system Air injection system operates Pulse generation (see  pwaveform 15)
      A24-53 (AIP2) - D74-97 (ETHW) G - BR Secondary air injection system pressure signal Ignition switch ON 3.0 to 3.6 V
      D74-90 (G2) - D74- 89 (G2-) R - G Camshaft position sensor Idling Pulse generation (see  owaveform 14)
      A24-18 (DI)-D74-81 (E1) L - BR Fuel pump control Ignition switch ON 0 to 3.0 V
      A24-14 (STSW)-D74-81 (E1) BR - BR Starter switch Shift lever position P or N, Cranking 6.0 V or more
      A24-41 (ACCR) - D74-81 (E1) BR - BR ACC relay control signal Ignition switch ON → Cranking 11 to 14 V → Below 1 V
      D74-16 (STAR) - D74-81 (E1) L - BR Starter relay control Ignition switch ON Below 1.5 V
      Cranking 5.5 V or more
      D74-72 (PSP) - D74-81 (E1) G-BR Power steering oil pressure sensor Ignition switch ON 0.5 to 4.5 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 (WAVEFORM 1)

      Item Content
      Terminal No. (Symbols) Between OC1+ and OC1-
      Between OC2+ and OC2-
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Idling
      Fig 2: Waveform Graph (Waveform 1)
      G04828019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. WAVEFORM 2:

      Heated oxygen sensor 

      WAVEFORM REFERENCE (WAVEFORM 2)

      Item Content
      Terminal No. (Symbols) Between OX1B and EX1B
      Between OX2B and EX2B
      Tool Setting 0.2 V/DIV., 200 msec./DIV.
      Condition Engine speed maintained at 2500 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: Waveform Graph (Waveform 2)
      G04828020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. WAVEFORM 3:

      Injector No. 1 (to No. 8) injection signal 

      WAVEFORM REFERENCE (WAVEFORM 3)

      Item Content
      Terminal No. (Symbols) Between #10 (to #80) and E01
      Tool Setting 20 V/DIV., 20 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 4: Waveform Graph (Waveform 3)
      G04828021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. WAVEFORM 4:

      Knock sensor 

      WAVEFORM REFERENCE (WAVEFORM 4)

      Item Content
      Terminal No. (Symbols) Between KNK1 and EKNK
      Between KNK2 and EKN2
      Tool Setting 1 V/DIV., 1 msec./DIV.
      Condition Engine speed maintained at 4000 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: Waveform Graph (Waveform 4)
        G04828022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. WAVEFORM 5:

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

      WAVEFORM REFERENCE (WAVEFORM 5)

      Item Content
      Terminal No. (Symbols) CH1: Between VV1+ and VV1-
      CH2: Between VV2+ and VV2-
      CH3: Between NE+ and NE-
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Idle after engine warmed-up

      HINT:

      The wavelength becomes shorter as engine rpm increases.

      Fig 6: Waveform Graph (Waveform 5)
      G05150107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. WAVEFORM 6:

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

      WAVEFORM REFERENCE (WAVEFORM 6)

      Item Content
      Terminal No. (Symbols)
      1. Between IGT1 (to IGT8) and E1
      2. Between IGF1 (IGF2) and E1
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as engine rpm increases.

      Fig 7: Waveform Graph (Waveform 6)
      G04967774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. WAVEFORM 7:

      Purge VSV 

      WAVEFORM REFERENCE (WAVEFORM 7)

      Item Content
      Terminal No. (Symbols) Between PRG and E1
      Tool Setting 10 V/DIV., 10 to 100 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: Waveform Graph (Waveform 7)
      G05149265Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. WAVEFORM 8:

      Vehicle speed signal 

      WAVEFORM REFERENCE (WAVEFORM 8)

      Item Content
      Terminal No. (Symbols) Between SPD and E-1
      Tool Setting 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: Waveform Graph (Waveform 8)
      G04828026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. WAVEFORM 9:

      Throttle actuator positive terminal 

      WAVEFORM REFERENCE (WAVEFORM 9)

      Item Content
      Terminal No. (Symbols) Between M+ and ME01
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Idling with warm engine

      HINT:

      The duty ratio varies depending on the throttle actuator operation.

      Fig 10: Waveform Graph (Waveform 9)
      G04828027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. WAVEFORM 10:

      Throttle actuator negative terminal 

      WAVEFORM REFERENCE (WAVEFORM 10)

      Item Content
      Terminal No. (Symbols) Between M- and ME01
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Idling with warm engine

      HINT:

      The duty ratio varies depending on the throttle actuator operation.

      Fig 11: Waveform Graph (Waveform 10)
      G04828028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. WAVEFORM 11:

      Engine speed signal 

      WAVEFORM REFERENCE (WAVEFORM 11)

      Item Content
      Terminal No. (Symbols) Between TACH and E1
      Tool Setting 5 V/DIV., 10 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 12: Waveform Graph (Waveform 11)
      G05149668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. WAVEFORM 12:

      CAN communication signal 

      WAVEFORM REFERENCE (WAVEFORM 12)

      Item Content
      Terminal No. (Symbols) Between CANH and E1
      Tool Setting 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: Waveform Graph (Waveform 12)
      G05149669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    14. WAVEFORM 13:

      CAN communication signal 

      WAVEFORM REFERENCE (WAVEFORM 13)

      Item Content
      Terminal No. (Symbols) Between CANL and E1
      Tool Setting 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: Waveform Graph (Waveform 13)
      G05149670Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    15. WAVEFORM 14:

      Camshaft position sensor 

      WAVEFORM REFERENCE (WAVEFORM 14)

      Item Content
      Terminal No. (Symbols) Between G2 and G2-
      Tool Setting 2 V/DIV., 200 msec./DIV.
      Condition Idle after engine warmed up

      HINT:

      • The wavelength becomes shorter as engine rpm increases.
      • *1:720°
      • *2: 180°
      • *3: 120°
      • *4: 60°
        Fig 15: Waveform Graph (Waveform 14)
        G05150116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    16. WAVEFORM 15:

      Terminal Dl of air injection control driver 

      WAVEFORM REFERENCE (WAVEFORM 15)

      Item Content
      Terminal No. (Symbols) Between AIDI or AID2 and E1
      Tool Setting 5 V/DIV., 20 to 40 msec./DIV.
      Condition Performing system check using intelligent tester or Techstream (air injection check)

      HINT:

      The wavelength changes when the air injection control driver detects malfunctions in the air injection system (see DTC P0412 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE "A" CIRCUIT; DTC P0415 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE "B" CIRCUIT ).

      Fig 16: Waveform Graph (Waveform 15)
      G05196599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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