SFI SYSTEM TERMINALS OF ECM

A0027PZN27

Tech Tips

The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals is also indicated. The result of checks should be compared with the standard voltage, resistance and waveform for each pair of the terminals as 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
A43-1 (BATT) - C1-49 (E1) GR - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A43-2 (+B) - C1-49 (E1) G - BR Power source of ECM Ignition switch ON 11 to 14 V
A43-3 (+B2) - C1-49 (E1) R - BR Power source of ECM Ignition switch ON 11 to 14 V
C1-60 (+BM) - C1-49 (E1) R - BR Power source of throttle actuator Always 11 to 14 V
A43-46 (MREL) - C1-49 (E1) B - BR EFI MAIN relay operation signal Ignition switch ON 11 to 14 V
C1-111 (VCV1) - C1-49 (E1) G - BR Power source for sensors (specific voltage) Ignition switch ON 4.5 to 5.5 V
A43-32 (IGSW) - C1-49 (E1) W - BR Ignition (engine) switch signal Ignition switch ON 11 to 14 V
A43-51 (STP) - C1-49 (E1) G - BR Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A43-36 (ST1-) - C1-49 (E1) L - BR Stop light switch assembly signal (opposite of STP voltage at terminal) Ignition switch ON, brake pedal depressed Below 1.5 V
Ignition switch ON, brake pedal released 7.5 to 14 V
A43-56 (VCPA) - A43-55 (EPA) B - Y Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A43-59 (VCP2) - A43-58 (EPA2) W - BE Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
A43-54 (VPA) - A43-55 (EPA) G - 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
A43-57 (VPA2) - A43-58 (EPA2) R - BE Accelerator pedal position sensor signal 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
C1-126 (VCTA) - C1-125 (ETA) B - R Power source for throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
C1-128 (VTA1) - C1-125 (ETA) Y - R 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
C1-127 (VTA2) - C1-125 (ETA) BR - R 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
A43-45 (TC) - C1-49 (E1) G - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A43-23 (TACH) - C1-49 (E1) L - BR Engine speed signal (for combination meter assembly) Idling

Pulse generation

(see waveform 1)
A43-10 (SPD) - C1-49 (E1) BE - BR Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

Pulse generation

(see waveform 2)
C1-58 (#10) - C1-25 (E01) B - W-B No. 1 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(see waveform 3)
C1-54 (#20) - C1-25 (E01) R - W-B No. 2 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(see waveform 3)
C1-57 (#30) - C1-25 (E01) Y - W-B No. 3 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(see waveform 3)
C1-53 (#40) - C1-25 (E01) L - W-B No. 4 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(see waveform 3)
C1-56 (#50) - C1-25 (E01) P - W-B No. 5 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(see waveform 3)
C1-55 (#60) - C1-25 (E01) G - W-B No. 6 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(see waveform 3)
A43-9 (STA) - C1-49 (E1) LG - BR ST relay operation signal Cranking 11 to 14 V
C1-35 (OC1+) - C1-5 (OC1-) W - B Camshaft timing oil control valve assembly (for intake camshaft of bank 1) operation signal Idling

Pulse generation

(see waveform 4)
C1-34 (OC2+) - C1-4 (OC2-) GR - R Camshaft timing oil control valve assembly (for intake camshaft of bank 2) operation signal Idling

Pulse generation

(see waveform 4)
C1-33 (OE1+) - C1-3 (OE1-) L - LG Camshaft timing oil control valve assembly (for exhaust camshaft of bank 1) operation signal Idling

Pulse generation

(see waveform 5)
C1-32 (OE2+) - C1-2 (OE2-) W - Y Camshaft timing oil control valve assembly (for exhaust camshaft of bank 2) operation signal Idling

Pulse generation

(see waveform 5)
C1-81 (VV1+) - C1-110 (VV1-) L - P VVT sensor (for intake camshaft of bank 1) signal Idling

Pulse generation

(see waveform 6)
C1-78 (VV2+) - C1-110 (VV1-) W - P VVT sensor (for intake camshaft of bank 2) signal Idling

Pulse generation

(see waveform 6)
C1-79 (EV1+) - C1-110 (VV1-) V - P VVT sensor (for exhaust camshaft of bank 1) signal Idling

Pulse generation

(see waveform 7)
C1-80 (EV2+) - C1-110 (VV1-) G - P VVT sensor (for exhaust camshaft of bank 2) signal Idling

Pulse generation

(see waveform 7)
C1-76 (NE+) - C1-109 (NE-) B - W Crankshaft position sensor signal Idling

Pulse generation

(see waveform 6, 7)
A43-22 (NEO)*2 - C1-49 (E1) GR - BR Engine speed signal sent to certification ECU (smart key ECU assembly) Idling with warm engine Pulse generation (see waveform 8)
C1-30 (M+) - C1-59 (ME01) W - BR Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(see waveform 9)
C1-29 (M-) - C1-59 (ME01) B - BR Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(see waveform 10)
C1-107 (IGT1) - C1-49 (E1) Y - BR No. 1 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
C1-140 (IGT2) - C1-49 (E1) R - BR No. 2 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
C1-106 (IGT3) - C1-49 (E1) G - BR No. 3 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
C1-139 (IGT4) - C1-49 (E1) L - BR No. 4 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
C1-105 (IGT5) - C1-49 (E1) P - BR No. 5 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
C1-138 (IGT6) - C1-49 (E1) BR - BR No. 6 ignition coil assembly (ignition signal) Idling

Pulse generation

(see waveform 11)
C1-103 (IGF1) - C1-49 (E1) W - BR Ignition coil assembly (ignition confirmation signal) Ignition switch ON 4.5 to 5.0 V
Idling

Pulse generation

(see waveform 11)
C1-114 (THW) - C1-117 (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
C1-96 (THA) - C1-118 (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
C1-98 (VG) - C1-130 (E2G) L - R Mass air flow meter sub-assembly signal Idling, shift lever in P or N, A/C switch off 0.5 to 3.0 V
C1-47 (ACIS) - C1-49 (E1) L - BR Intake air control valve assembly (for acoustic control induction system) operation signal Ignition switch ON 11 to 14 V
C1-48 (PRG) - C1-49 (E1) R - BR Purge VSV for EVAP system operation signal Ignition switch ON 11 to 14 V
Idling with warm engine, under purge control

Pulse generation

(see waveform 12)
C1-100 (A1A+) - C1-49 (E1) L - BR Air fuel ratio sensor (bank 1 sensor 1) signal Ignition switch ON 3.3 V*1
C1-132 (A1A-) - C1-49 (E1) P - BR Air fuel ratio sensor (bank 1 sensor 1) signal Ignition switch ON 2.9 V*1
C1-99 (A2A+) - C1-49 (E1) R - BR Air fuel ratio sensor (bank 2 sensor 1) signal Ignition switch ON 3.3 V*1
C1-131 (A2A-) - C1-49 (E1) G - BR Air fuel ratio sensor (bank 2 sensor 1) signal Ignition switch ON 2.9 V*1
C1-26 (HA1A) - C1-21 (E05) R - W-B Air fuel ratio sensor (bank 1 sensor 1) heater operation signal Idling Pulse generation (see waveform 13)
Ignition switch ON 11 to 14 V
C1-20 (HA2A) - C1-21 (E05) W - W-B Air fuel ratio sensor (bank 2 sensor 1) heater operation signal Idling Pulse generation (see waveform 13)
Ignition switch ON 11 to 14 V
C1-101 (OX1B) - C1-102 (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)
C1-133 (OX2B) - C1-134 (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)
C1-28 (HT1B) - C1-27 (E04) G - W-B Heated oxygen sensor (bank 1 sensor 2) heater operation signal Idling Below 3.0 V
Ignition switch ON 11 to 14 V
C1-22 (HT2B) - C1-27 (E04) Y - W-B Heated oxygen sensor (bank 2 sensor 2) heater operation signal Idling Below 3.0 V
Ignition switch ON 11 to 14 V
C1-65 (NSW) - C1-49 (E1) LG - BR Park/Neutral position switch assembly signal Ignition switch ON and shift lever in P or N Below 3.0 V
Ignition switch ON and shift lever not in P or N 11 to 14 V
C1-83 (KNK1) - C1-115 (EKNK) R - G Knock control sensor (bank 1) signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(see waveform 15)
C1-84 (KNK2) - C1-116 (EKN2) B - W Knock control sensor (bank 2) signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(see waveform 15)
C1-70 (P) - C1-49 (E1) B - BR P shift position switch signal Ignition switch ON and shift lever in P 11 to 14 V
Ignition switch ON and shift lever not in P Below 1 V
C1-68 (R) - C1-49 (E1) GR - BR R shift position switch signal Ignition switch ON and shift lever in R 11 to 14 V
Ignition switch ON and shift lever not in R Below 1 V
C1-71 (N) - C1-49 (E1) L - BR N shift position switch signal Ignition switch ON and shift lever in N 11 to 14 V
Ignition switch ON and shift lever not in N Below 1 V
C1-69 (D) - C1-49 (E1) G - BR D shift position switch signal Ignition switch ON and shift lever in D or S 11 to 14 V
Ignition switch ON and shift lever not in D or S Below 1 V
A43-37 (S) - C1-49 (E1) LG - BR S shift position switch signal Ignition switch ON and shift lever in S 11 to 14 V
Ignition switch ON and shift lever not in S Below 1 V
A43-50 (SFTD) - C1-49 (E1) SB - BR Down shift switch signal Ignition switch ON and shift lever in S 11 to 14 V
Ignition switch ON and shift lever in "-" (down shift) select and held Below 1 V
A43-34 (SFTU) - C1-49 (E1) V - BR Up shift switch signal Ignition switch ON and shift lever in S 11 to 14 V
Ignition switch ON and shift lever in "+" (up shift) select and held Below 1 V
A43-18 (FPC) - C1-49 (E1) P - BR Fuel pump control Engine stopped, ignition switch ON Below 1.5 V
A43-13 (CANH) - C1-49 (E1) B - BR CAN communication line Ignition switch ON

Pulse generation

(see waveform 16)
A43-26 (CANL) - C1-49 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(see waveform 17)
C1-31 (CAN+) - C1-49 (E1) B - BR CAN communication line Ignition switch ON

Pulse generation

(see waveform 16)
C1-1 (CAN-) - C1-49 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(see waveform 17)
C1-112 (ALT) - C1-49 (E1) L - BR Generator assembly Ignition switch ON 11 to 14 V
A43-5 (RFC) - C1-49 (E1) W - BR Cooling fan control signal Ignition switch ON, A/C switch on (max cool)

Pulse generation

(see waveform 18)
A43-11 (SNWI) - C1-49 (E1) GR - BR SNOW mode switch signal Ignition switch ON 11 to 14 V
Ignition switch ON, SNOW mode switch being pushed and held Below 1.5 V
C1-108 (GE01) - C1-49 (E1) BR - BR Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
A43-14 (EC) - Body ground W-B - - Ground Always Below 1 Ω
C1-49 (E1) - Body ground BR - - Ground Always Below 1 Ω
C1-25 (E01) - Body ground W-B - - Ground Always Below 1 Ω
C1-24 (E02) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
C1-27 (E04) - Body ground W-B - - Ground Always Below 1 Ω
C1-21 (E05) - Body ground W-B - - Ground Always Below 1 Ω

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

*2: w/ Smart Entry and Start System


  1. WAVEFORM 1

    A002AT7E01
    *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.

  2. WAVEFORM 2

    A0028EGE01
    *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.

  3. WAVEFORM 3

    A002AEDE01
    *1 20 V/DIV.
    *2 20 ms./DIV.
    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

    A002933E01
    *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-, or OC2+ and OC2-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  5. WAVEFORM 5

    A002933E01
    *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-, or OE2+ and OE2-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  6. WAVEFORM 6

    A002B1EE01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    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

    A002976E01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    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

    A0029UBE04
    *a 5 V/DIV.
    *b 2 ms./DIV.
    Engine Speed 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

    A002AKJE03
    *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.

  10. WAVEFORM 10

    A00294BE01
    *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.

  11. WAVEFORM 11

    A00286CE13
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Ignition Coil Assembly Signal (IGT and IGF1 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

    A002BVOE01
    *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 with warm engine, 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.

  13. WAVEFORM 13

    A0029PJE01
    *a 5 V/DIV.
    *b 10 ms./DIV.
    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

  14. WAVEFORM 14

    A00273LE01
    *1 0.2 V/DIV.
    *2 200 ms./DIV.
    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

    A002787E06
    *a 1 V/DIV.
    *b 1 ms./DIV.
    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

    A0027V6E01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANH and E1, or CAN+ 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

    A00279GE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANL and E1, or CAN- 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.

  18. WAVEFORM 18

    A00276NE03
    *a 1 V/DIV.
    *b 20 ms./DIV.
    Cooling Fan Control Signal
    ECM Terminal Name Between RFC and E1
    Tester Range 1 V/DIV., 20 ms./DIV.
    Condition Ignition switch ON, A/C switch on (max cool)

    Tech Tips

    The duty ratio varies depending on the engine coolant temperature.