SFI SYSTEM TERMINALS OF ECM

A385404E01
Tip:

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

A50-1 (BATT) - B186-59 (E1)

P - BR

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

A50-2 (+B) - B186-59 (E1)

B - BR

Power source of ECM

Ignition switch ON

11 to 14 V

A50-3 (+B2) - B186-59 (E1)

B - BR

Power source of ECM

Ignition switch ON

11 to 14 V

A50-6 (IGSW) - B186-59 (E1)

B - BR

Ignition switch signal

Ignition switch ON

11 to 14 V

A50-9 (STP) - B186-59 (E1)

LG - BR

Stop light switch assembly signal

Brake pedal depressed

7.5 to 14 V

Brake pedal released

Below 1.5 V

A50-10 (ST1-) - B186-59 (E1)

R - 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

A50-13 (CANH) - B186-59 (E1)

B - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 1)

A50-23 (NSW) - B186-59 (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 1.0 V

A50-26 (CANL) - B186-59 (E1)

W - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 2)

A50-27 (W) - B186-59 (E1)

LG - BR

Malfunction Indicator Lamp (MIL) operation signal

Ignition switch ON (MIL goes ON)

Below 1.5 V

Idling

11 to 14 V

A50-29 (STA) - B186-59 (E1)

LG - BR

Starter assembly signal

Cranking

6 V or higher

A50-30 (NEO)*2 - B186-59 (E1)

L - BR

Crankshaft position sensor signal sent to certification ECU (smart key ECU assembly)

Idling with warm engine

Pulse generation

(See waveform 3)

A50-31 (TACH) - B186-59 (E1)

P - BR

Engine speed signal

Idling

Pulse generation

(See waveform 4)

A50-32 (EC) - Body ground

BR - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

A50-33 (TC) - B186-59 (E1)

GR - BR

Terminal TC of DLC3

Ignition switch ON

11 to 14 V

A50-34 (ELS2) - B186-59 (E1)

L - BR

Electric load signal

Defogger switch on

11 to 14 V

Defogger switch off

Below 1.5 V

A50-41 (FC) - B186-59 (E1)

R - BR

Fuel pump control

Ignition switch ON

11 to 14 V

Idling

Below 1.5 V

A50-44 (SPD) - B186-59 (E1)

V - BR

Vehicle speed signal from combination meter assembly signal

Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 5)

A50-46 (MREL) - B186-59 (E1)

L - BR

EFI-MAIN relay operation signal

Ignition switch ON

11 to 14 V

A50-47 (VPA) - A50-48 (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

A50-49 (VCPA) - A50-48 (EPA)

B - Y

Power source of accelerator pedal position sensor (for VPA)

Ignition switch ON

4.5 to 5.5 V

A50-50 (VPA2) - A50-51 (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

A50-52 (VCP2) - A50-51 (EPA2)

L - P

Power source of accelerator pedal position sensor (for VPA2)

Ignition switch ON

4.5 to 5.5 V

A50-60 (RFC) - B186-59 (E1)

R - BR

Cooling fan control signal

Ignition switch ON, A/C switch on (max cool)

Pulse generation

(See waveform 6)

B186-26 (E04) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

B186-27 (HA1A) - B186-26 (E04)

R - W-B

Air fuel ratio sensor heater operation signal

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 8)

B186-28 (ME01) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

B186-29 (+BM) - B186-59 (E1)

B - BR

Power source of throttle actuator

Always

11 to 14 V

B186-30 (M-) - B186-28 (ME01)

P - W-B

Throttle actuator operation signal (negative signal)

Idling with warm engine

Pulse generation

(See waveform 9)

B186-33 (PRG) - B186-59 (E1)

L - BR

Purge VSV operation signal

Ignition switch ON

11 to 14 V

Idling, under purge control

Pulse generation

(See waveform 14)

B186-35 (OC1+) - B186-34 (OC1-)

B - Y

Camshaft timing oil control valve assembly (for intake camshaft) operation signal

Idling

Pulse generation

(See waveform 13)

B186-37 (OE1+) - B186-36 (OE1-)

G - P

Camshaft timing oil control valve assembly (for exhaust camshaft) operation signal

Idling

Pulse generation

(See waveform 12)

B186-56 (HT1B) - B186-59 (E1)

L - BR

Heated oxygen sensor heater operation signal

Ignition switch ON

11 to 14 V

Idling

Below 3.0 V

B186-57 (E01) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

B186-58 (E02) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

B186-59 (E1) - Body ground

BR - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

B186-60 (M+) - B186-28 (ME01)

V - W-B

Throttle actuator operation signal (positive terminal)

Idling with warm engine

Pulse generation

(See waveform 11)

B186-62 (ACIS) - B186-59 (E1)

Y - BR

Duty vacuum switching valve (for acoustic control induction system) operation signal

Ignition switch ON

11 to 14 V

B186-71 (IGF1) - B186-59 (E1)

Y - BR

Ignition coil assembly

(ignition confirmation signal)

Ignition switch ON

4.5 to 5.5 V

Idling

Pulse generation

(See waveform 10)

B186-72 (IGT4) - B186-59 (E1)

W - BR

No. 4 ignition coil assembly signal

(ignition signal)

Idling

Pulse generation

(See waveform 10)

B186-73 (IGT3) - B186-59 (E1)

G - BR

No. 3 ignition coil assembly signal

(ignition signal)

Idling

Pulse generation

(See waveform 10)

B186-74 (IGT2) - B186-59 (E1)

B - BR

No. 2 ignition coil assembly signal

(ignition signal)

Idling

Pulse generation

(See waveform 10)

B186-75 (IGT1) - B186-59 (E1)

R - BR

No. 1 ignition coil assembly signal

(ignition signal)

Idling

Pulse generation

(See waveform 10)

B186-80 (EV1+) - B186-112 (EV1-)

P - B

Camshaft position sensor (for exhaust camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 16)

B186-82 (VV1+) - B186-115 (VV1-)

B - P

Camshaft position sensor (for intake camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 16)

B186-95 (#20) - B186-57 (E01)

Y - W-B

No. 2 fuel injector assembly signal

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 7)

B186-96 (#30) - B186-57 (E01)

G - W-B

No. 3 fuel injector assembly signal

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 7)

B186-97 (#40) - B186-57 (E01)

W - W-B

No. 4 fuel injector assembly signal

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 7)

B186-98 (#10) - B186-57 (E01)

B - W-B

No. 1 fuel injector assembly signal

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 7)

B186-99 (OX1B) - B186-131 (EX1B)

B - Y

Heated oxygen sensor signal

Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 17)

B186-100 (A1A+) - B186-59 (E1)

Y - BR

Air fuel ratio sensor signal

Ignition switch ON

3.3 V*1

B186-101 (VTA2) - B186-133 (ETA)

R - 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

B186-108 (GE01) - Body ground

BR - Body ground

Shielded earth (ground) circuit of throttle actuator

Always

Below 1 Ω

B186-111 (VCE1) - B186-59 (E1)

W - BR

Power source of camshaft position sensor (for exhaust camshaft) (specific voltage)

Ignition switch ON

4.5 to 5.5 V

B186-114 (NE+) - B186-113 (NE-)

R - G

Crankshaft position sensor signal

Idling with warm engine

Pulse generation

(See waveform 15)

B186-116 (VCV1) - B186-59 (E1)

W - BR

Power source of camshaft position sensor (for intake camshaft) (specific voltage)

Ignition switch ON

4.5 to 5.5 V

B186-120 (THW) - B186-119 (ETHW)

B - BR

Engine coolant temperature sensor signal

Idling, engine coolant temperature 80°C (176°F)

0.2 to 1.0 V

B186-122 (KNK1) - B186-121 (EKNK)

B - W

Knock control sensor signal

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 18)

B186-132 (A1A-) - B186-59 (E1)

L - BR

Air fuel ratio sensor signal

Ignition switch ON

2.9 V*1

B186-134 (VCTA) - B186-133 (ETA)

G - L

Power source of throttle position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

B186-135 (VTA1) - B186-133 (ETA)

LG - 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

B186-137 (VG) - B186-104 (E2G)

V - 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

B186-138 (THA) - B186-139 (ETHA)

L - W

Intake air temperature sensor signal

Idling, intake air temperature 20°C (68°F)

0.5 to 3.4 V

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

  • *2: w/ Entry and Start System.

  1. WAVEFORM 1

    A283576E01
    Table 1. CAN Communication Signal (Reference)

    ECM Terminal Name

    Between CANH and E1

    Tester Range

    1 V/DIV., 10 μs./DIV.

    Condition

    Ignition switch ON
    Tip:

    The waveform varies depending on the CAN communication signal.

  2. WAVEFORM 2

    A283577E01
    Table 2. CAN Communication Signal (Reference)

    ECM Terminal Name

    Between CANL and E1

    Tester Range

    1 V/DIV., 10 μs./DIV.

    Condition

    Ignition switch ON
    Tip:

    The waveform varies depending on the CAN communication signal.

  3. WAVEFORM 3

    A287796E02
    Table 3. Engine Speed Signal

    ECM Terminal Name

    Between NEO and E1

    Tester Range

    1 V/DIV., 2 ms./DIV.

    Condition

    Idling with warm engine
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    A283574E01
    Table 4. Engine Speed Signal

    ECM Terminal Name

    Between TACH and E1

    Tester Range

    5 V/DIV., 10 ms./DIV.

    Condition

    Idling
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  5. WAVEFORM 5

    A283573E01
    Table 5. 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)
    Tip:

    The wavelength becomes shorter as the vehicle speed increases.

  6. WAVEFORM 6

    A282867E02
    Table 6. Cooling Fan Control Signal

    ECM Terminal Name

    Between RFC and E1

    Tester Range

    1 V/DIV., 2 ms./DIV.

    Condition

    Ignition switch ON, A/C switch on (max cool)
    Tip:

    The duty ratio varies depending on the engine coolant temperature.

  7. WAVEFORM 7

    A287799E03
    Table 7. 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
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8

    A205412E04
    Table 8. Air Fuel Ratio Sensor Heater Operation Signal

    ECM Terminal Name

    Between HA1A and E04

    Tester Range

    5 V/DIV., 10 ms./DIV.

    Condition

    Idling

  9. WAVEFORM 9

    A245848E22
    Table 9. 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
    Tip:

    The duty ratio varies depending on the throttle actuator operation.

  10. WAVEFORM 10

    A285441E06
    Table 10. 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
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  11. WAVEFORM 11

    A208000E20
    Table 11. 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
    Tip:

    The duty ratio varies depending on the throttle actuator operation.

  12. WAVEFORM 12

    A283575E02
    Table 12. 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

  13. WAVEFORM 13

    A283575E01
    Table 13. 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

  14. WAVEFORM 14

    A218020E05
    Table 14. Purge VSV Operation Signal

    ECM Terminal Name

    Between PRG and E1

    Tester Range

    10 V/DIV., 20 ms./DIV.

    Condition

    Idling, under purge control
    Tip:

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

  15. WAVEFORM 15

    A254145E01
    Table 15. Crankshaft Position Sensor Signal

    ECM Terminal Name

    Between NE+ and NE-

    Tester Range

    5 V/DIV., 20 ms./DIV.

    Condition

    Idling with warm engine
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  16. WAVEFORM 16

    A255508E20
    Table 16. 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
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  17. WAVEFORM 17

    A283571E01
    Table 17. 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
    Tip:

    In the Data List, the items O2S B1S2 show the values input to the ECM from the heated oxygen sensor.

  18. WAVEFORM 18

    A283572E01
    Table 18. 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
    Tip:

    • The wavelength becomes shorter as the engine speed increases.

    • The waveforms and amplitudes displayed differ slightly depending on the vehicle condition.