SFI SYSTEM TERMINALS OF ECM

B0058XBE05

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
A35-1 (BATT) - C65-59 (E1) B - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A35-2 (+B) - C65-59 (E1) B - BR Power source of ECM Engine switch on (IG) 11 to 14 V
A35-3 (+B2) - C65-59 (E1) B - BR Power source of ECM Engine switch on (IG) 11 to 14 V
A35-6 (IGSW) - C65-59 (E1) B - BR Engine switch signal Engine switch on (IG) 11 to 14 V
A35-7 (FANL) - C65-59 (E1) R - BR FAN NO. 3 relay Engine switch on (IG), cooling fans not operated 11 to 14 V
A35-8 (FANH) - C65-59 (E1) W - BR FAN NO. 1 and NO. 2 relay Engine switch on (IG), cooling fans not operated 11 to 14 V
A35-9 (STP) - C65-59 (E1) L - BR Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A35-10 (ST1-) - C65-59 (E1) G - BR

Stop light switch assembly signal

(opposite of voltage at 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
A35-13 (CANH) - C65-59 (E1) Y - BR CAN communication line Engine switch on (IG)

Pulse generation

(See waveform 1)
A35-26 (CANL) - C65-59 (E1) W - BR CAN communication line Engine switch on (IG)

Pulse generation

(See waveform 2)
A35-23 (NSW) - C65-59 (E1) W - BR Park/Neutral position switch assembly signal Engine switch on (IG), shift lever not in P or N 11 to 14 V
Engine switch on (IG), shift lever in P or N Below 1.0 V
A35-29 (STA) - C65-59 (E1) L - BR Starter assembly signal Cranking 6 V or higher
A35-30 (NEO) - C65-59 (E1) G - BR Crankshaft position sensor signal sent to certification ECU (smart key ECU assembly) Idling with warm engine

Pulse generation

(See waveform 3)
A35-31 (TACH) - C65-59 (E1) GR - BR Engine speed signal Idling

Pulse generation

(See waveform 4)
A35-32 (EC) - Body ground BR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
A35-33 (TC) - C65-59 (E1) V - BR Terminal TC of DLC3 Engine switch on (IG) 11 to 14 V
A35-41 (FC) - C65-59 (E1) W - BR Fuel pump control Engine switch on (IG) 11 to 14 V
Idling Below 1.5 V
A35-44 (SPD) - C65-59 (E1) Y - BR Vehicle speed signal from combination meter assembly signal Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 5)
A35-46 (MREL) - C65-59 (E1) R - BR EFI-MAIN NO. 1 relay operation signal Engine switch on (IG) 11 to 14 V
A35-47 (VPA) - A35-48 (EPA) L - L 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
A35-49 (VCPA) - A35-48 (EPA) B - L Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V
A35-50 (VPA2) - A35-51 (EPA2) R - P Accelerator pedal position sensor signal 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
A35-52 (VCP2) - A35-51 (EPA2) GR - P Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V
C65-26 (E04) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
C65-27 (HA1A) - C65-26 (E04) W - W-B Air fuel ratio sensor heater operation signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(See waveform 6)
C65-100 (A1A+) - C65-59 (E1) L - BR Air fuel ratio sensor signal Engine switch on (IG) 3.3 V*
C65-132 (A1A-) - C65-59 (E1) Y - BR Air fuel ratio sensor signal Engine switch on (IG) 2.9 V*
C65-28 (ME01) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
C65-29 (+BM) - C65-59 (E1) GR - BR Power source of throttle actuator Always 11 to 14 V
C65-134 (VCTA) - C65-133 (ETA) Y - L Power source of throttle position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
C65-135 (VTA1) - C65-133 (ETA) G - L 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
C65-101 (VTA2) - C65-133 (ETA) R - L 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
C65-60 (M+) - C65-28 (ME01) V - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See waveform 11)
C65-30 (M-) - C65-28 (ME01) P - W-B Throttle actuator operation signal (negative signal) Idling with warm engine

Pulse generation

(See waveform 7)
C65-108 (GE01) - Body ground B - Body ground Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
C65-31 (CAN+) - C65-59 (E1) Y - BR CAN communication line Engine switch on (IG)

Pulse generation

(See waveform 1)
C65-32 (CAN-) - C65-59 (E1) L - BR CAN communication line Engine switch on (IG)

Pulse generation

(See waveform 2)
C65-136 (SDWN) - C65-59 (E1) LG - BR Continuously variable valve lift controller assembly signal Engine switch on (IG) 5.4 to 8.6 V
C65-33 (PRG) - C65-59 (E1) G - BR Purge VSV operation signal Engine switch on (IG) 11 to 14 V
Idling, under purge control

Pulse generation

(See waveform 8)
C65-35 (OC1+) - C65-34 (OC1-) B - V Camshaft timing oil control valve assembly (for intake camshaft) operation signal Idling

Pulse generation

(See waveform 9)
C65-37 (OE1+) - C65-36 (OE1-) L - G Camshaft timing oil control valve assembly (for exhaust camshaft) operation signal Idling

Pulse generation

(See waveform 10)
C65-56 (HT1B) - C65-59 (E1) R - BR Heated oxygen sensor heater operation signal Engine switch on (IG) 11 to 14 V
Idling Below 3.0 V
C65-99 (OX1B) - C65-131 (EX1B) V - P Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 15)
C65-58 (E02) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
C65-59 (E1) - Body ground BR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
C65-71 (IGF1) - C65-59 (E1) W - BR

Ignition coil assembly

(ignition confirmation signal)

 Engine switch on (IG) 4.5 to 5.5 V
Idling

Pulse generation

(See waveform 12)
C65-72 (IGT4) - C65-59 (E1) L - BR

No. 4 ignition coil assembly signal

(ignition signal)

 Idling

Pulse generation

(See waveform 12)
C65-73 (IGT3) - C65-59 (E1) G - BR

No. 3 ignition coil assembly signal

(ignition signal)

 Idling

Pulse generation

(See waveform 12)
C65-74 (IGT2) - C65-59 (E1) B - BR

No. 2 ignition coil assembly signal

(ignition signal)

 Idling

Pulse generation

(See waveform 12)
C65-75 (IGT1) - C65-59 (E1) R - BR

No. 1 ignition coil assembly signal

(ignition signal)

 Idling

Pulse generation

(See waveform 12)
C65-77 (VCPM) - C65-76 (EPIM) R - BE Power source of manifold absolute pressure sensor Engine switch on (IG) 4.75 to 5.25 V
C65-78 (PIM) - C65-76 (EPIM) G - BE Manifold absolute pressure sensor signal Engine switch on (IG) 3.0 to 5.25 V
C65-111 (VCE1) - C65-112 (EV1-) GR - P Power source of camshaft position sensor (for exhaust camshaft) (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
C65-80 (EV1+) - C65-112 (EV1-) V - P Camshaft position sensor (for exhaust camshaft) signal Idling with warm engine

Pulse generation

(See waveform 13)
C65-81 (VCNE) - C65-59 (E1) P - BR Power source of crankshaft position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
C65-114 (NE+) - C65-113 (NE-) GR - W Crankshaft position sensor signal Idling with warm engine

Pulse generation

(See waveform 16)
C65-116 (VCV1) - C65-115 (VV1-) G - R Power source of camshaft position sensor (for intake camshaft) (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
C65-82 (VV1+) - C65-115 (VV1-) B - R Camshaft position sensor (for intake camshaft) signal Idling with warm engine

Pulse generation

(See waveform 13)
C65-89 (THEO) - C65-90 (ETHE) W - V Engine oil temperature sensor signal Idling with warm engine 0.3 to 0.85 V
C65-95 (#20) - C65-57 (E01) G - W-B No. 2 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(See waveform 14)
C65-96 (#30) - C65-57 (E01) B - W-B No. 3 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(See waveform 14)
C65-97 (#40) - C65-57 (E01) W - W-B No. 4 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(See waveform 14)
C65-98 (#10) - C65-57 (E01) GR - W-B No. 1 fuel injector assembly signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(See waveform 14)
C65-120 (THW) - C65-119 (ETHW) GR - P Engine coolant temperature sensor signal Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
C65-122 (KNK1) - C65-121 (EKNK) R - G Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 17)
C65-137 (VG) - C65-104 (E2G) R - V Mass air flow meter sub-assembly signal Idling, shift lever in P or N, A/C switch off 0.5 to 3.0 V
C65-138 (THA) - C65-139 (ETHA) G - L Intake air temperature sensor signal Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V


  1. WAVEFORM 1

    B005A30E01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CANH and E1

    Between 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.

  2. WAVEFORM 2

    B005AWJE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CANL and E1

    Between 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.

  3. WAVEFORM 3

    B0057OJE02
    *a 1 V/DIV.
    *b 2 ms./DIV.
    Engine Speed Signal
    ECM Terminal Name Between NEO and E1
    Tester Range 1 V/DIV., 2 ms./DIV.
    Condition Idling with warm engine

  4. WAVEFORM 4

    B00580BE01
    *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

    B00585WE01
    *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

    B0058XIE04
    *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

  7. WAVEFORM 7

    B0058YEE22
    *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.

  8. WAVEFORM 8

    B0058WYE05
    *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.

  9. WAVEFORM 9

    B00586UE01
    *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

  10. WAVEFORM 10

    B00586UE02
    *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

  11. WAVEFORM 11

    B00594BE20
    *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.

  12. WAVEFORM 12

    B0059SME09
    *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.

  13. WAVEFORM 13

    B005AKWE20
    *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 with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  14. WAVEFORM 14

    B0059Y7E05
    *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.

  15. WAVEFORM 15

    B005AA3E01
    *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 B1S2 show the values input to the ECM from the heated oxygen sensor.

  16. WAVEFORM 16

    B005971E03
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Crankshaft Position Sensor Signal
    ECM Terminal Name Between NE+ and NE-
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  17. WAVEFORM 17

    B0058C4E01
    *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.