SFI SYSTEM TERMINALS OF ECM

A01QUK3E12

Tech Tips

The standard normal voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of the terminals, and 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) - B75-16 (E1) W - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A62-2 (+B) - B75-16 (E1) R - BR Power source of ECM Ignition switch ON 11 to 14 V
A62-3 (+B2) - B75-16 (E1) P - BR Power source of ECM Ignition switch ON 11 to 14 V
A62-4 (ELS1) - B75-16 (E1) G - BR Electric load signal Taillight switch on 7.5 to 14 V
Taillight switch off Below 1.5 V
A62-7 (FANL) - B75-16 (E1) R - BR FAN NO.3 relay operation signal Ignition switch ON 11 to 14 V
Idling with A/C on or high engine coolant temperature Below 1.5 V
A62-8 (FANH) - B75-16 (E1) W - BR FAN NO.1 and NO.2 relay operation signal Idling with high engine coolant temperature Below 1.5 V
A62-9 (STP) - B75-16 (E1) L - BR Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A62-10 (ST1-) - B75-16 (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
A62-12 (CANP) - B75-16 (E1) B - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 1)
A62-13 (CANH) - B75-16 (E1) Y - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 1)
A62-17 (ELS2) - B75-16 (E1) P - BR Electric load signal Defogger switch on 7.5 to 14 V
Defogger switch off Below 1.5 V
A62-21 (FC) - B75-16 (E1) W - BR Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
A62-22 (STA) - B75-16 (E1) SB - BR Starter assembly signal Cranking 5.5 V or higher
A62-23 (TC) - B75-16 (E1) G - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A62-25 (CANN) - B75-16 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 2)
A62-26 (CANL) - B75-16 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 2)
A62-27 (W) - B75-16 (E1) R - BR Malfunction Indicator Lamp (MIL) operation signal Ignition switch ON (MIL goes off) Below 1.5 V
Idling 11 to 14 V
A62-30 (NEO)*2 - B75-16 (E1) P - BR Crankshaft position sensor signal sent to certification ECU (smart key ECU assembly) Idling with warm engine

Pulse generation

(See waveform 3)
A62-31 (TACH) - B75-16 (E1) GR - BR Engine speed signal Idling

Pulse generation

(See waveform 4)
A62-37 (IGSW) - B75-16 (E1) B - BR Ignition switch signal Ignition switch ON 11 to 14 V
A62-44 (SPD) - B75-16 (E1) V - BR Vehicle speed signal from combination meter assembly signal Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 5)
A62-46 (MREL) - B75-16 (E1) P - BR EFI-MAIN NO.1 relay operation signal Ignition switch ON 11 to 14 V
A62-50 (EC) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
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
A62-53 (VCPA) - A62-52 (EPA) B - Y Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A62-54 (VPA2) - A62-55 (EPA2) R - P Accelerator pedal position sensor signal (for sensor malfunctioning 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
A62-56 (VCP2) - A62-55 (EPA2) L - P Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B75-16 (E1) - Body ground BR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B75-17 (#20) - B75-51 (E01) G - W-B No. 2 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See WAVEFORM 6)
B75-18 (#30) - B75-51 (E01) B - W-B No. 3 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See WAVEFORM 6)
B75-19 (#40) - B75-51 (E01) W - W-B No. 4 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See WAVEFORM 6)
B75-20 (#10) - B75-51 (E01) L - W-B No. 1 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See WAVEFORM 6)
B75-21 (E02) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B75-22 (HT1B) - B75-16 (E1) R - BR Heated oxygen sensor heater operation signal Ignition switch ON 11 to 14 V
Idling Below 3.0 V
B75-23 (HA1A) - B75-52 (E04) L - W-B Air fuel ratio sensor heater operation signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See WAVEFORM 7)
B75-29 (+BM) - B75-16 (E1) L - BR Power source of throttle actuator Always 11 to 14 V
B75-30 (M-) - B75-59 (ME01) P - W-B Throttle actuator operation signal (negative signal) Idling with warm engine

Pulse generation

(See WAVEFORM 8)
B75-49 (SDWN) - B75-16 (E1) G - BR Continuously variable valve lift controller assembly signal Ignition switch ON 11 to 14 V
B75-50 (ACIS) - B75-16 (E1) R - BR Vacuum switching valve (for acoustic control induction system) operation signal Ignition switch ON 11 to 14 V
B75-51 (E01) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B75-52 (E04) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B75-54 (IGT4) - B75-16 (E1) L - BR

No. 4 ignition coil assembly signal

(ignition signal)

 Idling

Pulse generation

(See WAVEFORM 9)
B75-55 (IGT3) - B75-16 (E1) G - BR

No. 3 ignition coil assembly signal

(ignition signal)

 Idling

Pulse generation

(See WAVEFORM 9)
B75-56 (IGT2) - B75-16 (E1) B - BR

No. 2 ignition coil assembly signal

(ignition signal)

 Idling

Pulse generation

(See WAVEFORM 9)
B75-57 (IGT1) - B75-16 (E1) R - BR

No. 1 ignition coil assembly signal

(ignition signal)

 Idling

Pulse generation

(See WAVEFORM 9)
B75-58 (GE01) - Body ground BR - Body ground Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
B75-59 (ME01) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B75-60 (M+) - B75-59 (ME01) V - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See WAVEFORM 10)
B75-61 (CAN+) - B75-16 (E1) Y - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 1)
B75-62 (CAN-) - B75-16 (E1) L - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 2)
B75-63 (NSW)*3 - B75-16 (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
B75-65 (OE1+) - B75-64 (OE1-) R - LG Camshaft timing oil control valve assembly (for exhaust camshaft) operation signal Idling

Pulse generation

(See WAVEFORM 11)
B75-75 (OC1+) - B75-74 (OC1-) W - B Camshaft timing oil control valve assembly (for intake camshaft) operation signal Idling

Pulse generation

(See WAVEFORM 12)
B75-76 (PRG) - B75-16 (E1) G - BR Purge VSV operation signal Ignition switch ON 11 to 14 V
Idling, under purge control

Pulse generation

(See WAVEFORM 13)
B75-78 (NE+) - B75-110 (NE-) W - B Crankshaft position sensor signal Idling with warm engine

Pulse generation

(See WAVEFORM 14)
B75-80 (EV1+) - B75-112 (EV1-) B - R Camshaft position sensor (for exhaust camshaft) signal Idling with warm engine

Pulse generation

(See WAVEFORM 15)
B75-82 (VV1+) - B75-114 (VV1-) B - R Camshaft position sensor (for intake camshaft) signal Idling with warm engine

Pulse generation

(See WAVEFORM 15)
B75-83 (VTA2) - B75-116 (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
B75-84 (VTA1) - B75-116 (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
B75-87 (PIM) - B75-119 (EPIM) G - BR Manifold absolute pressure sensor signal Ignition switch ON 3.0 to 5.25 V
B75-90 (THA) - B75-122 (ETHA) W - BR Intake air temperature sensor signal Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
B75-91 (VG) - B75-92 (E2G) R - G Mass air flow meter sub-assembly signal Idling, shift lever in P or N (neutral), A/C switch off 0.5 to 3.0 V
B75-93 (THW) - B75-94 (ETHW) GR - BR Engine coolant temperature sensor signal Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
B75-102 (IGF1) - B75-16 (E1) W - BR

Ignition coil assembly

(ignition confirmation signal)

 Ignition switch ON 4.5 to 5.5 V
Idling

Pulse generation

(See WAVEFORM 9)
B75-103 (OX1B) - B75-135 (EX1B) W - B Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See WAVEFORM 16)
B75-111 (VCE1) - B75-16 (E1) G - BR Power source of camshaft position sensor (for exhaust camshaft) (specific voltage) Ignition switch ON 4.5 to 5.5 V
B75-113 (VCV1) - B75-16 (E1) G - BR Power source of camshaft position sensor (for intake camshaft) (specific voltage) Ignition switch ON 4.5 to 5.5 V
B75-115 (VCTA) - B75-116 (ETA) Y - L Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B75-118 (VCPM) - B75-119 (EPIM) R - BR Power source of manifold absolute pressure sensor Ignition switch ON 4.5 to 5.5 V
B75-123 (KNK1) - B75-124 (EKNK) R - G Knock sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See WAVEFORM 17)
B75-133 (A1A+) - B75-16 (E1) L - BR Air fuel ratio sensor signal Ignition switch ON 3.3 V*1
B75-134 (A1A-) - B75-16 (E1) Y - BR Air fuel ratio sensor signal Ignition switch ON 2.9 V*1


  1. WAVEFORM 1

    A01QT3XE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CANH and E1

    Between CAN+ and E1

    Between CANP 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.

  2. WAVEFORM 2

    A01QP9GE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CANL and E1

    Between CAN- and E1

    Between CANN 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.

  3. WAVEFORM 3

    A01QSEUE03
    *a 1 V/DIV.
    *b 2 ms./DIV.
    Crankshaft Position Sensor Signal
    ECM Terminal Name Between NEO and E1
    Tester Range 1 V/DIV., 2 ms./DIV.
    Condition Idling with warm engine

  4. WAVEFORM 4

    A01QULGE01
    *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.

  5. WAVEFORM 5

    A01QQ2ME01
    *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.

  6. WAVEFORM 6

    A01QQUXE02
    *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.

  7. WAVEFORM 7

    A01QOSTE04
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Air Fuel Ratio Sensor Heater Operation Signal
    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8

    A01QT2JE22
    *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.

  9. WAVEFORM 9

    A01QRJDE02
    *a 2 V/DIV.
    *b 20 ms/DIV.
    Ignition Coil Assembly Signal (IGT and IGF Signal)
    ECM Terminal Name

    CH1: Between IGT (1 to 4) and E1

    CH2: 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

    A01QQ9NE20
    *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.

  11. WAVEFORM 11

    A01QOGKE02
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly (for Exhaust Camshaft) Signal
    ECM Terminal Name Between OE1+ and OE1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  12. WAVEFORM 12

    A01QOGKE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly (for Intake Camshaft) Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  13. WAVEFORM 13

    A01QR96E05
    *1 10 V/DIV.
    *2 20 ms./DIV.
    Purge VSV Operation Signal
    ECM Terminal Name Between PRG and E1
    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.

  14. WAVEFORM 14

    A01QOOEE01
    *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 with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  15. WAVEFORM 15

    A01QQVHE20
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Position Sensor Signal
    ECM Terminal Name

    CH1: Between VV1+ and VV1-

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

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  16. WAVEFORM 16

    A01QUHAE01
    *1 0.2 V/DIV.
    *2 200 ms./DIV.
    Heated Oxygen Sensor 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 items O2S B1 S2 show the values input to the ECM from the heated oxygen sensor.

  17. WAVEFORM 17

    A01QQSKE01
    *a 1 V/DIV.
    *b 1 ms./DIV.
    Knock 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.