SFI SYSTEM TERMINALS OF ECM

A01G70VE39

Tech Tips

The standard 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 voltage for that pair of 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
A22-1 (BATT) - D23-49 (E1) GR - BR Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
A22-2 (+B) - D23-49 (E1) P - BR Power source of ECM Engine switch on (IG) 11 to 14 V
A22-3 (+B2) - D23-49 (E1) LG - BR Power source of ECM Engine switch on (IG) 11 to 14 V
D23-60 (+BM) - D23-49 (E1) R - BR Power source of throttle actuator Always 11 to 14 V
A22-46 (MREL) - D23-49 (E1) BE - BR EFI MAIN relay operation signal Engine switch on (IG) 11 to 14 V
D23-111 (VCV1) - D23-49 (E1) LG - BR Power source for sensors (specific voltage) Idling with warm engine 4.5 to 5.5 V
A22-32 (IGSW) - D23-49 (E1) V - BR Engine switch signal Engine switch on (IG) 11 to 14 V
A22-51 (STP) - D23-49 (E1) BE - BR Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A22-36 (ST1-) - D23-49 (E1) GR - BR Stop light switch assembly signal (opposite to STP terminal) Engine switch on (IG), brake pedal depressed Below 1.5 V
Engine switch on (IG), brake pedal released 7.5 to 14 V
A22-56 (VCPA) - A22-55 (EPA) P - Y Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V
A22-59 (VCP2) - A22-58 (EPA2) L - BE Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V
A22-54 (VPA) - A22-55 (EPA) G - Y Accelerator pedal position sensor signal (for engine control) Engine switch on (IG), accelerator pedal fully released 0.5 to 1.1 V
Engine switch on (IG), accelerator pedal fully depressed 2.6 to 4.5 V
A22-57 (VPA2) - A22-58 (EPA2) R - BE Accelerator pedal position sensor signal (for sensor malfunction detection) Engine switch on (IG), accelerator pedal fully released 1.2 to 2.0 V
Engine switch on (IG), accelerator pedal fully depressed 3.4 to 4.75 V
D23-126 (VCTA) - D23-125 (ETA) B - R Power source for throttle position sensor (specific voltage) Idling with warm engine 4.5 to 5.5 V
D23-128 (VTA1) - D23-125 (ETA) Y - R Throttle position sensor signal (for engine control) Engine switch on (IG), accelerator pedal fully released 0.5 to 1.1 V
Engine switch on (IG), accelerator pedal fully depressed 3.2 to 4.8 V
D23-127 (VTA2) - D23-125 (ETA) W - R Throttle position sensor signal (for sensor malfunction detection) Engine switch on (IG), accelerator pedal fully released 2.1 to 3.1 V
Engine switch on (IG), accelerator pedal fully depressed 4.6 to 5.0 V
A22-45 (TC) - D23-49 (E1) P - BR Terminal TC of DLC3 Engine switch on (IG) 11 to 14 V
A22-23 (TACH) - D23-49 (E1) B - BR Engine speed signal (for combination meter assembly) Idling

Pulse generation

(see waveform 1)
A22-10 (SPD) - D23-49 (E1) L - BR Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

Pulse generation

(see waveform 2)
A22-27 (W) - D23-49 (E1) R - BR Malfunction Indicator Lamp (MIL) operation signal

Engine switch on (IG)

(MIL goes on)

 Below 3.0 V
Idling with warm engine 11 to 14 V
D23-58 (#10) - D23-25 (E01) B - W-B No. 1 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(see waveform 3)
D23-54 (#20) - D23-25 (E01) R - W-B No. 2 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(see waveform 3)
D23-57 (#30) - D23-25 (E01) Y - W-B No. 3 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(see waveform 3)
D23-53 (#40) - D23-25 (E01) L - W-B No. 4 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(see waveform 3)
D23-56 (#50) - D23-25 (E01) P - W-B No. 5 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(see waveform 3)
D23-55 (#60) - D23-25 (E01) G - W-B No. 6 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(see waveform 3)
A22-9 (STA) - D23-49 (E1) LG - BR ST relay operation signal Cranking 5.5 V or higher
D23-35 (OC1+) - D23-5 (OC1-) W - B Camshaft timing oil control valve assembly (for intake camshaft of bank 1) operation signal Idling

Pulse generation

(see waveform 4)
D23-34 (OC2+) - D23-4 (OC2-) GR - R Camshaft timing oil control valve assembly (for intake camshaft of bank 2) operation signal Idling

Pulse generation

(see waveform 4)
D23-33 (OE1+) - D23-3 (OE1-) L - LG Camshaft timing oil control valve assembly (for exhaust camshaft of bank 1) operation signal Idling

Pulse generation

(see waveform 5)
D23-32 (OE2+) - D23-2 (OE2-) W - Y Camshaft timing oil control valve assembly (for exhaust camshaft of bank 2) operation signal Idling

Pulse generation

(see waveform 5)
D23-81 (VV1+) - D23-110 (VV1-) L - P VVT sensor (for intake camshaft of bank 1) signal Idling

Pulse generation

(see waveform 6)
D23-78 (VV2+) - D23-110 (VV1-) W - P VVT sensor (for intake camshaft of bank 2) signal Idling

Pulse generation

(see waveform 6)
D23-79 (EV1+) - D23-110 (VV1-) V - P VVT sensor (for exhaust camshaft of bank 1) signal Idling

Pulse generation

(see waveform 7)
D23-80 (EV2+) - D23-110 (VV1-) G - P VVT sensor (for exhaust camshaft of bank 2) signal Idling

Pulse generation

(see waveform 7)
D23-76 (NE+) - D23-109 (NE-) G - R Crankshaft position sensor signal Idling

Pulse generation

(see waveform 6, 7)
A22-22 (NEO) - D23-49 (E1) G - BR Crankshaft position sensor signal sent to certification ECU (smart key ECU assembly) Idling with warm engine Pulse generation (see waveform 8)
D23-30 (M+) - D23-59 (ME01) W - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(see waveform 9)
D23-29 (M-) - D23-59 (ME01) B - W-B Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(see waveform 10)
D23-107 (IGT1) - D23-49 (E1) W - BR No. 1 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
D23-140 (IGT2) - D23-49 (E1) G - BR No. 2 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
D23-106 (IGT3) - D23-49 (E1) G - BR No. 3 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
D23-139 (IGT4) - D23-49 (E1) LG - BR No. 4 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
D23-105 (IGT5) - D23-49 (E1) P - BR No. 5 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
D23-138 (IGT6) - D23-49 (E1) L - BR No. 6 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
D23-103 (IGF1) - D23-49 (E1) V - BR Ignition coil assembly (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.0 V
Idling

Pulse generation

(see waveform 11)
D23-114 (THW) - D23-117 (ETHW) B - P Engine coolant temperature sensor signal Idling, engine coolant temperature 60 to 120°C (140 to 248°F) 0.2 to 1.0 V
D23-96 (THA) - D23-118 (ETHA) P - Y Intake air temperature sensor signal Idling, intake air temperature 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
D23-46 (AICV) - D23-49 (E1) L - BR Vacuum switching valve (for air intake control valve) operation signal Engine switch on (IG) 11 to 14 V
D23-98 (VG) - D23-130 (E2G) L - B Mass air flow meter sub-assembly signal Idling, shift lever in P or N, A/C switch off 0.5 to 3.0 V
D23-47 (ACIS) - D23-49 (E1) L - BR Intake air control valve assembly (for acoustic control induction system) operation signal Engine switch on (IG) 11 to 14 V
D23-48 (PRG) - D23-49 (E1) R - BR Purge VSV operation signal Engine switch on (IG) 11 to 14 V
Idling with warm engine

Pulse generation

(see waveform 12)
D23-100 (A1A+) - D23-49 (E1) L - BR Air fuel ratio sensor (bank 1 sensor 1) signal Engine switch on (IG) 3.3 V*
D23-132 (A1A-) - D23-49 (E1) P - BR Air fuel ratio sensor (bank 1 sensor 1) signal Engine switch on (IG) 2.9 V*
D23-99 (A2A+) - D23-49 (E1) R - BR Air fuel ratio sensor (bank 2 sensor 1) signal Engine switch on (IG) 3.3 V*
D23-131 (A2A-) - D23-49 (E1) G - BR Air fuel ratio sensor (bank 2 sensor 1) signal Engine switch on (IG) 2.9 V*
D23-26 (HA1A) - D23-21 (E05) R - W-B Air fuel ratio sensor (bank 1 sensor 1) heater operation signal Idling Pulse generation (see waveform 13)
Engine switch on (IG) 11 to 14 V
D23-20 (HA2A) - D23-21 (E05) W - W-B Air fuel ratio sensor (bank 2 sensor 1) heater operation signal Idling Pulse generation (see waveform 13)
Engine switch on (IG) 11 to 14 V
D23-101 (OX1B) - D23-102 (EX1B) W - GR Heated oxygen sensor (bank 1 sensor 2) signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(see waveform 14)
D23-133 (OX2B) - D23-134 (EX2B) B - R Heated oxygen sensor (bank 2 sensor 2) signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(see waveform 14)
D23-28 (HT1B) - D23-27 (E04) G - W-B Heated oxygen sensor (bank 1 sensor 2) heater operation signal Idling Below 3.0 V
Engine switch on (IG) 11 to 14 V
D23-22 (HT2B) - D23-27 (E04) Y - W-B Heated oxygen sensor (bank 2 sensor 2) heater operation signal Idling Below 3.0 V
Engine switch on (IG) 11 to 14 V
A22-8 (ACM) - D23-49 (E1) R - BR Duty vacuum switching valve (for active control engine mount system) operation signal Engine switch on (IG) 11 to 14 V
D23-65 (NSW) - D23-49 (E1) LG - BR Park/Neutral position switch assembly signal Engine switch on (IG) and shift lever in P or N Below 3.0 V
Engine switch on (IG) and shift lever not in P or N 11 to 14 V
D23-83 (KNK1) - D23-115 (EKNK) R - G Knock control sensor (bank 1) signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(see waveform 15)
D23-84 (KNK2) - D23-116 (EKN2) B - W Knock control sensor (bank 2) signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(see waveform 15)
D23-70 (P) - D23-49 (E1) B - BR P shift position switch signal Engine switch on (IG) and shift lever in P 11 to 14 V
Engine switch on (IG) and shift lever not in P Below 1 V
D23-68 (R) - D23-49 (E1) GR - BR R shift position switch signal Engine switch on (IG) and shift lever in R 11 to 14 V
Engine switch on (IG) and shift lever not in R Below 1 V
D23-71 (N) - D23-49 (E1) L - BR N shift position switch signal Engine switch on (IG) and shift lever in N 11 to 14 V
Engine switch on (IG) and shift lever not in N Below 1 V
D23-69 (D) - D23-49 (E1) G - BR D shift position switch signal Engine switch on (IG) and shift lever in D or S 11 to 14 V
Engine switch on (IG) and shift lever not in D or S Below 1 V
A22-37 (S) - D23-49 (E1) Y - BR S shift position switch signal Engine switch on (IG) and shift lever in S 11 to 14 V
Engine switch on (IG) and shift lever not in S Below 1 V
A22-50 (SFTD) - D23-49 (E1) L - BR Down shift switch signal Engine switch on (IG) and shift lever in S 11 to 14 V
Engine switch on (IG) and shift lever held in "-" (down shift) position Below 1 V
A22-34 (SFTU) - D23-49 (E1) R - BR Up shift switch signal Engine switch on (IG) and shift lever in S 11 to 14 V
Engine switch on (IG) and shift lever held in "+" (up shift) position Below 1 V
A22-18 (FPC) - D23-49 (E1) W - BR Fuel pump control Engine stopped, engine switch on (IG) Below 1.5 V
A22-13 (CANH) - D23-49 (E1) B - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 16)
A22-26 (CANL) - D23-49 (E1) W - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 17)
D23-31 (CAN+) - D23-49 (E1) B - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 16)
D23-1 (CAN-) - D23-49 (E1) Y - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 17)
D23-112 (ALT) - D23-49 (E1) L - BR Generator assembly Engine switch on (IG) 11 to 14 V
A22-5 (RFC) - D23-49 (E1) G - BR Cooling fan control Engine switch on (IG), A/C switch on (max cool)

Pulse generation

(see waveform 18)
A22-24 (PWMS) - D23-49 (E1) L - BR Drive mode switch (SPORT mode) Engine switch on (IG) 11 to 14 V
Engine switch on (IG), SPORT mode switch being turned and held at SPORT position (SPORT mode) 0 to 1.5 V
A22-11 (SPCN) - D23-49 (E1) B - BR Drive mode switch (NORMAL mode) Engine switch on (IG) 11 to 14 V
Engine switch on (IG), NORMAL mode switch being pushed and held (NORMAL mode) 0 to 1.5 V
D23-108 (GE01) - D23-49 (E1) G - BR Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
A22-14 (EC) - Body ground W-B - - Ground Always Below 1 Ω
D23-49 (E1) - Body ground BR - - Ground Always Below 1 Ω
D23-25 (E01) - Body ground W-B - - Ground Always Below 1 Ω
D23-24 (E02) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
D23-27 (E04) - Body ground W-B - - Ground Always Below 1 Ω
D23-21 (E05) - Body ground W-B - - Ground Always Below 1 Ω

*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.


  1. WAVEFORM 1

    A01G5A4E33
    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.

  2. WAVEFORM 2

    A01G813E29
    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.

  3. WAVEFORM 3

    A01G6XZE24
    No. 1 (to No. 6) Fuel Injector Assembly Signal
    ECM Terminal Name Between #10 (to #60) and E01
    Tester Range 20 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    A01G4X7E11
    Camshaft Timing Oil Control Valve Assembly (for Intake Camshaft) Operation Signal
    ECM Terminal Name Between OC1+ and OC1-, or OC2+ and OC2-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  5. WAVEFORM 5

    A01G4X7E11
    Camshaft Timing Oil Control Valve Assembly (for Exhaust Camshaft) Operation Signal
    ECM Terminal Name Between OE1+ and OE1-, or OE2+ and OE2-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  6. WAVEFORM 6

    A01G7S0E01
    Crankshaft Position Sensor Signal and VVT Sensor (for Intake Camshaft) Signal
    ECM Terminal Name

    Between NE+ and NE-

    Between VV1+ and VV1-

    Between VV2+ and VV1-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  7. WAVEFORM 7

    A01G5RHE01
    Crankshaft Position Sensor Signal and VVT Sensor (for Exhaust Camshaft) Signal
    ECM Terminal Name

    Between NE+ and NE-

    Between EV1+ and VV1-

    Between EV2+ and VV1-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8

    A01G7GWE01
    Crankshaft Position Sensor Signal
    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.

  9. WAVEFORM 9

    A01G8F0E03
    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.

  10. WAVEFORM 10

    A01G6DJE01
    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.

  11. WAVEFORM 11

    A01G6YEE08
    Ignition Coil Assembly Signal (IGT and IGF Signal)
    ECM Terminal Name

    Between IGT (1 to 6) and E1

    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.

  12. WAVEFORM 12

    A01G5HJE01
    Purge VSV Operation Signal
    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

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

  13. WAVEFORM 13

    A01G5S7E01
    Air Fuel Ratio Sensor (Sensor 1) Heater Operation Signal
    ECM Terminal Name Between HA1A and E05, or HA2A and E05
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength varies in accordance with the engine operating condition.

  14. WAVEFORM 14

    A01G6UWE15
    Heated Oxygen Sensor (Sensor 2) Signal
    ECM Terminal Name Between OX1B and EX1B, or OX2B and EX2B
    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, item O2S B1S2 and O2S B2S2 shows the ECM values from the heated oxygen sensor.

  15. WAVEFORM 15

    A01G4PVE82
    Knock Control Sensor Signal
    ECM Terminal Name Between KNK1 and EKNK, or KNK2 and EKN2
    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.

  16. WAVEFORM 16

    A01G70QE48
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANH and E1, or CAN+ and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  17. WAVEFORM 17

    A01G65SE44
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANL and E1, or CAN- and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  18. WAVEFORM 18

    A01G82PE01
    Cooling Fan Control Signal
    ECM Terminal Name Between RFC and E1
    Tester Range 1 V/DIV., 20 ms./DIV.
    Condition Engine switch on (IG), A/C switch on (max cool)

    Tech Tips

    The wavelength becomes shorter as the engine coolant temperature.