SFI SYSTEM TERMINALS OF ECM

B006X2FE01

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
A22-1 (BATT) - C58-59 (E1) R - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A22-2 (+B) - C58-59 (E1) L - W-B Power source of ECM Ignition switch ON 11 to 14 V
A22-3 (+B2) - C58-59 (E1) L - W-B Power source of ECM Ignition switch ON 11 to 14 V
A22-6 (IGSW) - C58-59 (E1) B - W-B Ignition switch signal Ignition switch ON 11 to 14 V
A22-9 (STP) - C58-59 (E1) SB - W-B Stop light switch assembly signal Brake pedal depressed 11 to 14 V
Brake pedal released Below 1.5 V
A22-10 (ST1-) - C58-59 (E1) LG - W-B

Stop light switch assembly signal

(opposite of 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
A22-13 (CANH) - C58-59 (E1) B - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 1)
A22-23 (NSW) - C58-59 (E1) BE - W-B Park/Neutral position switch assembly signal Ignition switch ON, shift lever in P or N Below 1.0 V
Ignition switch ON, shift lever not in P or N 11 to 14 V
A22-26 (CANL) -C58-59 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 2)
A22-29 (STA) - C58-59 (E1) G - W-B Starter assembly signal Cranking 6.0 V or higher
A22-30 (NEO)*1 - C58-59 (E1) B - W-B Engine speed signal sent to certification ECU (smart key ECU assembly) Idling with warm engine

Pulse generation

(See waveform 3)
A22-31 (TACH) - C58-59 (E1) P - W-B Engine speed signal Idling with warm engine

Pulse generation

(See waveform 4)
A22-32 (EC) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
A22-33 (TC) - C58-59 (E1) GR - W-B Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A22-41 (FC) - C58-57 (E01) V - W-B Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
A22-44 (SPD) - C58-59 (E1) L - W-B Vehicle speed signal from combination meter assembly signal Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 5)
A22-46 (MREL) - C58-59 (E1) W - W-B EFI-MAIN NO. 1 relay operation signal Ignition switch ON 11 to 14 V
A22-47 (VPA) - A22-48 (EPA) G - L 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
A22-49 (VCPA) - A22-48 (EPA) BE - L Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A22-50 (VPA2) - A22-51 (EPA2) GR - P 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
A22-52 (VCP2) - A22-51 (EPA2) SB - P Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
A22-56 (SPCN)*2 - C58-59 (E1) V - W-B Drive mode siwtch (NORMAL mode) Ignition switch ON 11 to 14 V
Ignition switch ON, NORMAL mode switch being pushed and held (NORMAL mode) 0 to 1.5 V
A22-57 (PWMS)*2 - C58-59 (E1) LG - W-B Drive mode siwtch (SPORT mode) Ignition switch ON 11 to 14 V
Ignition switch ON, SPORT mode switch being pushed and held at SPORT position (SPORT mode) 0 to 1.5 V
A22-60 (RFC) - C58-59 (E1) LG - W-B Cooling fan control signal Ignition switch ON, A/C switch on (max cool)

Pulse generation

(See waveform 6)
C58-18 (#20) - C58-57 (E01) G - W-B No. 2 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling with warm engine

Pulse generation

(See waveform 7)
C58-19 (#30) - C58-57 (E01) LG - W-B No. 3 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling with warm engine

Pulse generation

(See waveform 7)
C58-20 (#40) - C58-57 (E01) BE - W-B No. 4 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling with warm engine

Pulse generation

(See waveform 7)
C58-21 (#10) - C58-57 (E01) B - W-B No. 1 fuel injector assembly signal Ignition switch ON 11 to 14 V
Idling with warm engine

Pulse generation

(See waveform 7)
C58-24 (IA1-)*3 - C58-57 (E01) G - W-B Intake air control valve actuator (for tumble control valve) Idling with cold engine

Pulse generation

(See waveform 8)
C58-25 (IA1+)*3 - C58-57 (E01) W - W-B Intake air control valve actuator (for tumble control valve) Idling with cold engine

Pulse generation

(See waveform 9)
C58-26 (E04) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
C58-27 (HA1A) - C58-26 (E04) R - W-B Air fuel ratio sensor heater operation signal Idling with cold engine

Pulse generation

(See waveform 10)
Ignition switch ON 11 to 14 V
C58-28 (ME01) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
C58-29 (+BM) - C58-59 (E1) G - W-B Power source of throttle actuator Always 11 to 14 V
C58-30 (M-) - C58-28 (ME01) W - W-B Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(See waveform 11)
C58-32 (ACIS) - C58-57 (E01) P - W-B Vacuum switching valve assembly (for acoustic control induction system) operation signal Ignition switch ON 11 to 14 V
C58-33 (PRG) - C58-57 (E01) W - W-B Purge VSV operation signal Ignition switch ON 11 to 14 V
Idling, under purge control

Pulse generation

(See waveform 12)
C58-35 (OC1+) - C58-34 (OC1-) LG - BE Camshaft timing oil control valve assembly (for intake camshaft) operation signal Idling

Pulse generation

(See waveform 13)
C58-37 (OE1+) - C58-36 (OE1-) R - V Camshaft timing oil control valve assembly (for exhaust camshaft) operation signal Idling

Pulse generation

(See waveform 14)
C58-42 (IGT4) - C58-59 (E1) B - W-B No. 4 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 15)
C58-43 (IGT3) - C58-59 (E1) P - W-B No. 3 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 15)
C58-44 (IGT2) - C58-59 (E1) R - W-B No. 2 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 15)
C58-45 (IGT1) - C58-59 (E1) W - W-B No. 1 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 15)
C58-55 (HT1B) - C58-26 (E04) L - W-B Heated oxygen sensor heater operation signal Idling Below 3.0 V
Ignition switch ON 11 to 14 V
C58-57 (E01) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
C58-58 (E02) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
C58-59 (E1) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
C58-60 (M+) - C58-28 (ME01) B - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See waveform 16)
C58-71 (IGF1) - C58-59 (E1) G - W-B Ignition coil assembly (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling with warm engine

Pulse generation

(See waveform 15)
C58-80 (EV1+) - C58-112 (EV1-) LG - W Camshaft position sensor (for exhaust camshaft) signal Idling with warm engine

Pulse generation

(See waveform 17)
C58-82 (VV1+) - C58-115 (VV1-) B - R Camshaft position sensor (for intake camshaft) signal Idling with warm engine

Pulse generation

(See waveform 17)
C58-96 (VCIA)*3 - C58-59 (E1) LG - W-B Power source of tumble control valve position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
C58-97 (IAC1)*3 - C58-95 (EIA1)*3 B - L Tumble control valve position sensor Ignition switch off to ON 3.0 to 4.0 V
C58-99 (OX1B) - C58-131 (EX1B) B - W Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 18)
C58-100 (A1A+) - C58-59 (E1) L - B-W Air fuel ratio sensor signal Ignition switch ON 3.3 V*4
C58-101 (VTA2) - C58-133 (ETA) W - G 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
C58-108 (GE01) - Body ground BR - - Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
C58-111 (VCE1) - C58-59 (E1) B - W-B Power source of camshaft position sensor (for exhaust camshaft) (specific voltage) Ignition switch ON 4.5 to 5.5 V
C58-114 (NE+) - C58-113 (NE-) B - W Crankshaft position sensor signal Idling with warm engine

Pulse generation

(See waveform 19)
C58-116 (VCV1) - C58-59 (E1) W - W-B Power source of camshaft position sensor (for intake camshaft) (specific voltage) Ignition switch ON 4.5 to 5.5 V
C58-120 (THW) - C58-119 (ETHW) B - W Engine coolant temperature sensor signal Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
C58-122 (KNK1) - C58-121 (EKNK) R - G Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 20)
C58-132 (A1A-) - C58-59 (E1) P - W-B Air fuel ratio sensor signal Ignition switch ON 2.9 V*4
C58-134 (VCTA) - C58-133 (ETA) R - G Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
C58-135 (VTA1) - C58-133 (ETA) B - G 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
C58-137 (VG) - C58-104 (E2G) BE - 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
C58-138 (THA) - C58-139 (ETHA) P - G Intake air temperature sensor signal Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
*1: w/ Smart Entry and Start System.
*2: w/ Drive Mode Switch
*3: w/ Tumble Control Valve
*4: The ECM terminal voltage is constant regardless of the output voltage from the sensor.

  1. WAVEFORM 1

    B004L2BE01
    *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.

  2. WAVEFORM 2

    B004L07E02
    *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.

  3. WAVEFORM 3

    B004OC7E08
    *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.

  4. WAVEFORM 4

    B004OA7E01
    *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 with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  5. WAVEFORM 5

    B004J32E01
    *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

    B0071Q4E08
    *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.

  7. WAVEFORM 7

    B004M6FE01
    *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 with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8

    B004HR4E01
    *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

  9. WAVEFORM 9

    B004IA2E01
    *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

  10. WAVEFORM 10

    B004IVOE06
    *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 with cold engine

  11. WAVEFORM 11

    B004JSTE01
    *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.

  12. WAVEFORM 12

    B004LMNE09
    *1 10 V/DIV.
    *2 20 ms./DIV.
    Purge VSV Operation 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.

  13. WAVEFORM 13

    B004O1BE01
    *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

  14. WAVEFORM 14

    B004O1BE01
    *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

  15. WAVEFORM 15

    B004JZXE01
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Ignition Coil Assembly Signal (IGT and IGF1 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 with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  16. WAVEFORM 16

    B004M0FE44
    *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.

  17. WAVEFORM 17

    B004KWFE16
    *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.

  18. WAVEFORM 18

    B004LPCE01
    *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 item O2S B1S2 shows the values input to the ECM from the heated oxygen sensor.

  19. WAVEFORM 19

    B004KFKE10
    *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.

  20. WAVEFORM 20

    B006ZLLE06
    *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.