SFI SYSTEM(w/o Canister Pump Module) TERMINALS OF ECM

A01QPY0E48

Tech Tips

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.

Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
A62-1 (BATT) - B77-16 (E1) W - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
B77-29 (+BM) - B77-16 (E1) L - BR Power source of throttle actuator Always 11 to 14 V
A62-37 (IGSW) - B77-16 (E1) B - BR Ignition switch signal Ignition switch ON 11 to 14 V
A62-2 (+B) - B77-16 (E1) R - BR Power source of ECM Ignition switch ON 11 to 14 V
A62-3 (+B2) - B77-16 (E1) P - BR Power source of ECM Ignition switch ON 11 to 14 V
B77-74 (OC1+) - B77-75 (OC1-) W - B Camshaft timing oil control valve assembly operation signal (for intake camshaft) Idling

Pulse generation

(See waveform 1)
B77-65 (OE1+) - B77-64 (OE1-) R - LG Camshaft timing oil control valve assembly operation signal (for exhaust camshaft) Idling

Pulse generation

(See waveform 2)
A62-46 (MREL) - B77-16 (E1) P - BR EFI MAIN relay operation signal Ignition switch ON 11 to 14 V
B77-91 (VG) - B77-92 (E2G) R - G Mass air flow meter sub-assembly signal Idling, shift lever in P, A/C switch off 0.5 to 3.0 V
B77-93 (THA) - B77-94 (ETHA) W - BR Intake air temperature sensor signal Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
B77-95 (THW) - B77-96 (ETHW) GR - BR Engine coolant temperature sensor signal Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
B77-125 (VCTA) - B77-126 (ETA) Y - L Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B77-127 (VTA1) - B77-126 (ETA) G - L Throttle position sensor signal (for engine control)

Ignition switch ON,

accelerator pedal fully released

 0.5 to 1.1 V

Ignition switch ON,

accelerator pedal fully depressed

 3.2 to 4.8 V
B77-128 (VTA2) - B77-126 (ETA) L - L Throttle position sensor signal (for sensor malfunction detection)

Ignition switch ON,

accelerator pedal fully released

 2.1 to 3.1 V

Ignition switch ON,

accelerator pedal fully depressed

 4.6 to 5.0 V
A62-51 (VPA) - A62-52 (EPA) W - Y Accelerator pedal position sensor signal (for engine control)

Ignition switch ON,

accelerator pedal fully released

 0.5 to 1.1 V

Ignition switch ON,

accelerator pedal fully depressed

 2.6 to 4.5 V
A62-54 (VPA2) - A62-55 (EPA2) R - P Accelerator pedal position sensor signal (for sensor malfunction detection)

Ignition switch ON,

accelerator pedal fully released

 1.2 to 2.0 V

Ignition switch ON,

accelerator pedal fully depressed

 3.4 to 4.75 V
A62-53 (VCPA) - A62-52 (EPA) B - Y Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A62-56 (VCP2) - A62-55 (EPA2) L - P Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B77-23 (HA1A) - B77-53 (E04) L - W-B Air fuel ratio sensor heater operation signal Idling

Pulse generation

(See waveform 3)
Ignition switch ON 11 to 14 V
B77-133 (A1A+) - B77-16 (E1) L - BR Air fuel ratio sensor signal Ignition switch ON 3.3 V*1
B77-134 (A1A-) - B77-16 (E1) Y - BR Air fuel ratio sensor signal Ignition switch ON 2.9 V*1
B77-24 (HT1B) - B77-53 (E04) R - W-B Heated oxygen sensor heater operation signal Idling Below 3.0 V
Ignition switch ON 11 to 14 V
B77-100 (OX1B) - B77-132 (EX1B) W - B Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 4)
B77-20 (#10) - B77-50 (E01) L - W-B No. 1 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 5)
B77-17 (#20) - B77-50 (E01) G - W-B No. 2 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 5)
B77-18 (#30) - B77-50 (E01) B - W-B No. 3 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 5)
B77-19 (#40) - B77-50 (E01) W - W-B No. 4 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 5)
B77-123 (KNK1) - B77-124 (EKNK) R - G Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 6)
B77-82 (VV1+) - B77-114 (VV1-) B - R Camshaft position sensor signal (for intake camshaft) Idling

Pulse generation

(See waveform 7)
B77-81 (EV1+) - B77-112 (EV1-) B - R Camshaft position sensor signal (for exhaust camshaft) Idling

Pulse generation

(See waveform 7)
B77-76 (NE+) - B77-109 (NE-) W - B Crankshaft position sensor signal Idling

Pulse generation

(See waveform 8)
B77-57 (IGT1) - B77-16 (E1) R - BR No. 1 ignition coil assembly (ignition signal) Idling

Pulse generation

(See waveform 9)
B77-56 (IGT2) - B77-16 (E1) B - BR No. 2 ignition coil assembly (ignition signal) Idling

Pulse generation

(See waveform 9)
B77-55 (IGT3) - B77-16 (E1) G - BR No. 3 ignition coil assembly (ignition signal) Idling

Pulse generation

(See waveform 9)
B77-54 (IGT4) - B77-16 (E1) L - BR No. 4 ignition coil assembly (ignition signal) Idling

Pulse generation

(See waveform 9)
B77-51 (IGF1) - B77-16 (E1) W - BR Ignition coil assembly (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling

Pulse generation

(See waveform 9)
B77-68 (PRG) - B77-50 (E01) G - W-B Purge VSV operation signal Ignition switch ON 11 to 14 V
Idling, under purge control

Pulse generation

(See waveform 10)
A62-57 (SPD) - B77-16 (E1) V - BR Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 11)
A62-22 (STA) - B77-16 (E1) SB - BR Starter signal Cranking 5.5 V or higher
B77-63 (NSW) - B77-16 (E1) W - BR Park/neutral position switch assembly signal Ignition switch ON, shift lever not in P or N 11 to 14 V
Ignition switch ON, shift lever in P or N Below 3.0 V
A62-11 (STP) - B77-16 (E1) L - BR Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A62-24 (ST1-) - B77-16 (E1) GR - BR

Stop light switch assembly signal

(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
B77-60 (M+) - B77-58 (ME01) V - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See waveform 12)
B77-30 (M-) - B77-58 (ME01) P - W-B Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(See waveform 13)
A62-21 (FC) - B77-50 (E01) W - W-B Fuel pump control Ignition switch ON 11 to 14 V
A62-30 (W) - B77-16 (E1) R - BR Malfunction Indicator Lamp (MIL) operation signal Ignition switch ON Below 3.0 V
Idling 11 to 14 V
A62-23 (TC) - B77-16 (E1) G - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A62-31 (TACH) - B77-16 (E1) GR - BR Engine speed Idling

Pulse generation

(See waveform 14)
B77-113 (VCV1) - B77-16 (E1) W - BR Power source of camshaft position sensor (for intake camshaft) (specific voltage) Ignition switch ON 4.5 to 5.5 V
B77-111 (VCE1) - B77-16 (E1) G - BR Power source of camshaft position sensor (for exhaust camshaft) (specific voltage) Ignition switch ON 4.5 to 5.5 V
B77-73 (ALT) - B77-16 (E1) B - BR Generator assembly Ignition switch ON 11 to 14 V
A62-13 (CANH) - B77-16 (E1) Y - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 15)
A62-26 (CANL) - B77-16 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 16)
B77-69 (ACIS) - B77-50 (E01) R - W-B Vacuum switching valve for ACIS (Acoustic Control Induction System) operation signal Ignition switch ON 11 to 14 V
B77-22 (IA1+) - B77-50 (E01) W - W-B Intake air control valve actuator for tumble control valve Idling with cold engine

Pulse generation

(See waveform 17)
B77-21 (IA1-) - B77-50 (E01) G - W-B Intake air control valve actuator for tumble control valve Idling with cold engine

Pulse generation

(See waveform 18)
B77-131 (IAC1) - B77-129 (EIA1) B - L Tumble control valve position sensor Ignition switch off to ON 3.0 to 4.0 V
B77-130 (VCIA) - B77-16 (E1) B - BR Power source of tumble control valve position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
A62-45 (NEO)*2 - B77-16 (E1) P - BR Crankshaft revolution signal sent to certification ECU (smart key ECU assembly) Idling with warm engine

Pulse generation

(See waveform 19)
A62-5 (FANL) - B77-50 (E01) R - W-B Cooling fan motor operation signal (low) Ignition switch ON 11 to 14 V
Idling with A/C on, or high engine coolant temperature Below 1.5 V
A62-6 (FANH) - B77-50 (E01) W - W-B Cooling fan motor operation signal (high) Ignition switch ON 11 to 14 V
Idling with high engine coolant temperature Below 1.5 V
A62-4 (ELS1) - B77-16 (E1) P - BR Electric load Rear window defogger switch on 7.5 to 14 V
Rear window defogger switch off Below 1.5 V
A62-14 (EC) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
B77-16 (E1) - Body ground BR - - Earth (ground) circuit of ECM Always Below 1 Ω
B77-50 (E01) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
B77-49 (E02) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
B77-53 (E04) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
B77-58 (ME01) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
B77-59 (GE01) - Body ground BR - - Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω


  1. WAVEFORM 1

    A01QSWWE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly (for Intake Camshaft) Operation Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  2. WAVEFORM 2

    A01QSWWE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly (for Exhaust Camshaft) Operation Signal
    ECM Terminal Name Between OE1+ and OE1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  3. WAVEFORM 3

    A01QOSTE06
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Air Fuel Ratio Sensor (Sensor 1) Heater Operation Signal
    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength varies in accordance with the engine operating condition.

  4. WAVEFORM 4

    A01QPOLE01
    *1 0.2 V/DIV.
    *2 200 ms./DIV.
    Heated Oxygen Sensor (Sensor 2) Signal
    ECM Terminal Name Between OX1B and EX1B
    Tester Range 0.2 V/DIV., 200 ms./DIV.
    Condition Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    Tech Tips

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

  5. WAVEFORM 5

    A01QOJDE01
    *1 20 V/DIV.
    *2 20 ms./DIV.
    No. 1 (to No. 4) Fuel Injector Assembly Signal
    ECM Terminal Name Between #10 (to #40) and E01
    Tester Range 20 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  6. WAVEFORM 6

    A01QQSKE06
    *a 1 V/DIV.
    *b 1 ms./DIV.
    Knock Control Sensor Signal
    ECM Terminal Name Between KNK1 and EKNK
    Tester Range 1 V/DIV., 1 ms./DIV.
    Condition Engine speed maintained at 4000 rpm after warming up engine

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • The waveforms and amplitudes displayed differ slightly depending on the vehicle condition.

  7. WAVEFORM 7

    A01QQVHE16
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Position Sensor Signal (for Intake and Exhaust Camshaft)
    ECM Terminal Name

    CH1: Between VV1+ and VV1-

    CH2: Between EV1+ and EV1-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8

    A01QOOEE02
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Crankshaft Position Sensor Signal
    ECM Terminal Name Between NE+ and NE-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  9. WAVEFORM 9

    A01QRJDE03
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Ignition Coil Assembly Signal (IGT and IGF Signal)
    ECM Terminal Name

    IGT: Between IGT (1 to 4) and E1

    IGF: Between IGF1 and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  10. WAVEFORM 10

    A01QR96E09
    *1 10 V/DIV.
    *2 20 ms./DIV.
    Purge VSV Signal
    ECM Terminal Name Between PRG and E01
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition Idling, under purge control

    Tech Tips

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

  11. WAVEFORM 11

    A01QRB6E01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Vehicle Speed Signal
    ECM Terminal Name Between SPD and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Driving at 20 km/h (12 mph)

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  12. WAVEFORM 12

    A01QQ9NE03
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Throttle Actuator Positive Terminal Signal
    ECM Terminal Name Between M+ and ME01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  13. WAVEFORM 13

    A01QT2JE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Throttle Actuator Negative Terminal Signal
    ECM Terminal Name Between M- and ME01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  14. WAVEFORM 14

    A01QR6ZE01
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Engine Speed Signal
    ECM Terminal Name Between TACH and E1
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  15. WAVEFORM 15

    A01QPVDE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANH and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  16. WAVEFORM 16

    A01QTCDE02
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANL and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  17. WAVEFORM 17

    A01QSJ0E01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Positive Terminal of Intake Air Control Valve Actuator (for Tumble Control Valve) Signal
    ECM Terminal Name Between IA1+ and E01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling with cold engine

  18. WAVEFORM 18

    A01QRMPE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Negative Terminal of Intake Air Control Valve Actuator (for Tumble Control Valve) Signal
    ECM Terminal Name Between IA1- and E01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling with cold engine

  19. WAVEFORM 19

    A01QTGNE04
    *a 5 V/DIV.
    *b 2 ms./DIV.
    Crankshaft Revolution Signal (for Certification ECU (Smart Key ECU Assembly))
    ECM Terminal Name Between NEO and E1
    Tester Range 5 V/DIV., 2 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.