SFI SYSTEM TERMINALS OF ECM

A247842E47
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 the 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) - B31-16 (E1)

P - BR

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

A50-2 (+B) - B31-16 (E1)

B - BR

Power source of ECM

Ignition switch ON

11 to 14 V

A50-3 (+B2) - B31-16 (E1)

B - BR

Power source of ECM

Ignition switch ON

11 to 14 V

B31-29 (+BM) - B31-16 (E1)

B - BR

Power source of throttle actuator

Always

11 to 14 V

B31-57 (IGT1) - B31-16 (E1)

R - BR

No. 1 ignition coil signal (No. 1 cylinder)

(ignition signal)

Idling

Pulse generation

(See waveform 1)

B31-56 (IGT2) - B31-16 (E1)

B - BR

No. 1 ignition coil signal (No. 2 cylinder)

(ignition signal)

Idling

Pulse generation

(See waveform 1)

B31-55 (IGT3) - B31-16 (E1)

G - BR

No. 1 ignition coil signal (No. 3 cylinder)

(ignition signal)

Idling

Pulse generation

(See waveform 1)

B31-54 (IGT4) - B31-16 (E1)

W - BR

No. 1 ignition coil signal (No. 4 cylinder)

(ignition signal)

Idling

Pulse generation

(See waveform 1)

B31-109 (VCNE) - B31-16 (E1)

B - BR

Power source of crankshaft position sensor

Ignition switch ON

4.5 to 5.5 V

B31-78 (NE+) - B31-110 (NE-)

R - Y

Crankshaft position sensor signal

Idling with warm engine

Pulse generation

(See waveform 2)

B31-113 (VCV1) - B31-16 (E1)

R - BR

Power source of camshaft position sensor (for intake camshaft)

Ignition switch ON

4.5 to 5.5 V

B31-111 (VCE1) - B31-16 (E1)

W - BR

Power source of camshaft position sensor (for exhaust camshaft)

Ignition switch ON

4.5 to 5.5 V

B31-82 (VV1+) - B31-114 (VV1-)

B - W

Camshaft position sensor signal (for intake camshaft)

Idling with warm engine

Pulse generation

(See waveform 3)

B31-80 (EV1+) - B31-112 (EV1-)

P - B

Camshaft position sensor signal (for exhaust camshaft)

Idling with warm engine

Pulse generation

(See waveform 3)

B31-20 (#10) - B31-51 (E01)

B - W-B

Fuel injector assembly signal (No. 1 cylinder)

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 4)

B31-17 (#20) - B31-51 (E01)

Y - W-B

Fuel injector assembly signal (No. 2 cylinder)

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 4)

B31-18 (#30) - B31-51 (E01)

G - W-B

Fuel injector assembly signal (No. 3 cylinder)

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 4)

B31-19 (#40) - B31-51 (E01)

W - W-B

Fuel injector assembly signal (No. 4 cylinder)

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 4)

B31-23 (HA1A) - B31-52 (E04)

R - W-B

Air fuel ratio sensor (sensor 1) heater operation signal

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 5)

B31-133 (A1A+) - B31-16 (E1)

B - BR

Air fuel ratio sensor (sensor 1) signal

Ignition switch ON

3.3 V*1

B31-134 (A1A-) - B31-16 (E1)

W - BR

Air fuel ratio sensor (sensor 1) signal

Ignition switch ON

2.9 V*1

B31-22 (HT1B) - B31-52 (E04)

L - W-B

Heated oxygen sensor (sensor 2) heater operation signal

Ignition switch ON

11 to 14 V

Idling

Below 3.0 V

B31-103 (OX1B) - B31-135 (EX1B)

B - Y

Heated oxygen sensor (sensor 2) signal

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

Pulse generation

(See waveform 6)

B31-123 (KNK1) - B31-124 (EKNK)

W - B

Knock control sensor signal

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 7)

A50-44 (SPD) - B31-16 (E1)

V - BR

Vehicle speed signal from combination meter assembly

Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 8)

B31-93 (THW) - B31-94 (ETHW)

B - BR

Engine coolant temperature sensor signal

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

0.2 to 1.0 V

B31-90 (THA) - B31-122 (ETHA)

L - W

Intake air temperature sensor signal

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

0.5 to 3.4 V

B31-91 (VG) - B31-92 (E2G)

V - B

Mass air flow meter sub-assembly signal

Idling, shift lever in neutral, A/C switch off

0.5 to 3.0 V

A50-27 (W) - B31-16 (E1)

LG - BR

Malfunction Indicator Lamp (MIL) operation signal

Ignition switch ON (MIL goes on)

Below 3.0 V

Idling

11 to 14 V

A50-22 (STA) - B31-16 (E1)

LG - BR

Starter assembly signal

Cranking

6 V or higher

B31-63 (NSW) - B31-16 (E1)

W - BR

Clutch start switch assembly signal

Ignition switch ON, clutch pedal fully depressed

Below 1.5 V

Ignition switch ON, clutch pedal fully released

11 to 14 V

B31-84 (VTA1) - B31-116 (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

B31-83 (VTA2) - B31-116 (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

B31-115 (VCTA) - B31-116 (ETA)

Y - L

Power source of throttle position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

A50-53 (VCPA) - A50-52 (EPA)

B - Y

Power source of accelerator pedal position sensor (for VPA)

Ignition switch ON

4.5 to 5.5 V

A50-51 (VPA) - A50-52 (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

A50-54 (VPA2) - A50-55 (EPA2)

R - 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

A50-56 (VCP2) - A50-55 (EPA2)

L - P

Power source of accelerator pedal position sensor (for VPA2)

Ignition switch ON

4.5 to 5.5 V

B31-60 (M+) - B31-59 (ME01)

P - W-B

Throttle actuator operation signal (positive terminal)

Idling with warm engine

Pulse generation

(See waveform 9)

B31-30 (M-) - B31-59 (ME01)

V - W-B

Throttle actuator operation signal (negative terminal)

Idling with warm engine

Pulse generation

(See waveform 10)

A50-9 (STP) - B31-16 (E1)

L*2 - BR

LG*3 - BR

Stop light switch assembly signal

Brake pedal depressed

7.5 to 14 V

Brake pedal released

Below 1.5 V

A50-10 (ST1-) - B31-16 (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

B31-76 (PRG) - B31-16 (E1)

L - BR

Purge VSV operation signal

Ignition switch ON

11 to 14 V

Idling, under purge control

Pulse generation

(See waveform 11)

A50-21 (FC) - B31-16 (E1)

R - BR

Fuel pump control signal

Ignition switch ON

11 to 14 V

Idling

Below 1.5 V

A50-31 (TACH) - B31-16 (E1)

GR - BR

Engine speed signal

Idling

Pulse generation

(See waveform 12)

A50-23 (TC) - B31-16 (E1)

P - BR

Terminal TC of DLC3

Ignition switch ON

11 to 14 V

B31-75 (OC1+) - B31-74 (OC1-)

B - Y

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

Idling

Pulse generation

(See waveform 13)

B31-65 (OE1+) - B31-64 (OE1-)

G - P

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

Idling

Pulse generation

(See waveform 14)

A50-13 (CANH) - B31-16 (E1)

B - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 15)

A50-12 (CANP)*4 - B31-16 (E1)

B - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 15)

A50-26 (CANL) - B31-16 (E1)

W - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 16)

A50-25 (CANN)*4 - B31-16 (E1)

SB - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 16)

B31-79 (R) - B31-16 (E1)

L - BR

Back-up light switch assembly signal

Back-up light switch assembly on

11 to 14 V

B31-100 (ALT)*5 - B31-16 (E1)

L - BR

Generator assembly

Ignition switch ON

11 to 14 V

A50-37 (IGSW) - B31-16 (E1)

B - BR

Ignition switch signal

Ignition switch ON

11 to 14 V

A50-46 (MREL) - B31-16 (E1)

L - BR

EFI-MAIN relay operation signal

Ignition switch ON

11 to 14 V

A50-17 (ELS2) - B31-16 (E1)

L - BR

Electric load signal

Rear window defogger switch on

11 to 14 V

Rear window defogger switch off

Below 1.5 V

B31-28 (EGR1) - B31-16 (E1)

L - BR

EGR valve assembly operation signal

EGR valve assembly operating

Pulse generation

(See waveform 17)

B31-27 (EGR2) - B31-16 (E1)

G - BR

EGR valve assembly operation signal

EGR valve assembly operating

Pulse generation

(See waveform 18)

B31-26 (EGR3) - B31-16 (E1)

W - BR

EGR valve assembly operation signal

EGR valve assembly operating

Pulse generation

(See waveform 17)

B31-25 (EGR4) - B31-16 (E1)

R - BR

EGR valve assembly operation signal

EGR valve assembly operating

Pulse generation

(See waveform 18)

A50-45 (RFC) - B31-16 (E1)

R - BR

Cooling fan control signal

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

Pulse generation

(See waveform 19)

B31-118 (VCPM) - B31-119 (EPIM)

R - Y

Power source of manifold absolute pressure sensor

Ignition switch ON

4.75 to 5.25 V

B31-87 (PIM) - B31-119 (EPIM)

V - Y

Manifold absolute pressure sensor signal

Ignition switch ON

3.0 to 5.0 V

A50-30 (NEO) - B31-16 (E1)

L - BR

Crankshaft position sensor signal

Idling with warm engine

Pulse generation

(See waveform 20)

A50-50 (EC) - Body ground

BR - -

Earth (ground) circuit of ECM

Always

Below 1 Ω

B31-51 (E01) - Body ground

W-B - -

Earth (ground) circuit of ECM

Always

Below 1 Ω

B31-21 (E02) - Body ground

W-B - -

Earth (ground) circuit of ECM

Always

Below 1 Ω

B31-59 (ME01) - Body ground

W-B - -

Earth (ground) circuit of ECM

Always

Below 1 Ω

B31-58 (GE01) - Body ground

BR - -

Shielded earth (ground) circuit of throttle actuator

Always

Below 1 Ω

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

  • *2: for Hatchback, Wagon models.

  • *3: for Sedan models.

  • *4: w/ Generator Control System.

  • *5: w/o Generator Control System.

  1. WAVEFORM 1

    A247035E02
    Table 1. No. 1 Ignition Coil Signal (IGT Signal)

    ECM Terminal Name

    Between IGT (1 to 4) and E1

    Tester Range

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

    Condition

    Idling
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  2. WAVEFORM 2

    A200774E04
    Table 2. Crankshaft Position Sensor Signal

    ECM Terminal Name

    Between NE+ and NE-

    Tester Range

    2 V/DIV., 20 ms./DIV.

    Condition

    Idling with warm engine
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  3. WAVEFORM 3

    A255508E18
    Table 3. 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
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    A283570E01
    Table 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.

  5. WAVEFORM 5

    A205412E04
    Table 5. Air Fuel Ratio Sensor (Sensor 1) Heater Operation Signal

    ECM Terminal Name

    Between HA1A and E04

    Tester Range

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

    Condition

    Idling

  6. WAVEFORM 6

    A283571E01
    Table 6. Heated Oxygen Sensor (Sensor 2) 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 item O2S B1S2 shows the values input to the ECM from the heated oxygen sensor.

  7. WAVEFORM 7

    A283572E01
    Table 7. 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.

  8. WAVEFORM 8

    A283573E01
    Table 8. 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.

  9. WAVEFORM 9

    A208000E20
    Table 9. 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.

  10. WAVEFORM 10

    A245848E22
    Table 10. 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.

  11. WAVEFORM 11

    A218020E05
    Table 11. 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.

  12. WAVEFORM 12

    A283574E01
    Table 12. 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.

  13. WAVEFORM 13

    A283575E01
    Table 13. 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

    A283575E02
    Table 14. 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

    A283576E01
    Table 15. CAN Communication Signal (Reference)

    ECM Terminal Name

    Between CANH and E1, or CANP and E1

    Tester Range

    1 V/DIV., 10 μs./DIV.

    Condition

    Ignition switch ON
    Tip:

    The waveform varies depending on the CAN communication signal.

  16. WAVEFORM 16

    A283577E01
    Table 16. CAN Communication Signal (Reference)

    ECM Terminal Name

    Between CANL and E1, or CANN and E1

    Tester Range

    1 V/DIV., 10 μs./DIV.

    Condition

    Ignition switch ON
    Tip:

    The waveform varies depending on the CAN communication signal.

  17. WAVEFORM 17

    A287801E02
    Table 17. EGR Valve Assembly Operation Signal

    ECM Terminal Name

    CH1: Between EGR1 and E1

    CH2: Between EGR3 and E1

    Tester Range

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

    Condition

    EGR valve assembly operating

  18. WAVEFORM 18

    A287800E02
    Table 18. EGR Valve Assembly Operation Signal

    ECM Terminal Name

    CH1: Between EGR2 and E1

    CH2: Between EGR4 and E1

    Tester Range

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

    Condition

    EGR valve assembly operating

  19. WAVEFORM 19

    A293502E02
    Table 19. 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.

  20. WAVEFORM 20

    A287796E02
    Table 20. Crankshaft Position Sensor 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.