SFI SYSTEM TERMINALS OF ECM

A325174E01
Tip:

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

A34-1 (+B1) - A34-4 (E1)

B - W-B

Power source of ECM

Ignition switch ON

11 to 14 V

A34-2 (+B) - A34-4 (E1)

B - W-B

Power source of ECM

Ignition switch ON

11 to 14 V

A34-4 (E1) - Body ground

W-B - -

Earth (ground) circuit of ECM

Always

Below 1 Ω

A34-5 (E01) - Body ground

W-B - -

Earth (ground) circuit of ECM

Always

Below 1 Ω

A34-9 (MREL) - A34-4 (E1)

GR - W-B

EFI-MAIN relay operation signal

Ignition switch ON

11 to 14 V

A34-12 (CANN)*1 - A34-4 (E1)

W - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 1)

A34-13 (CANP)*1 - A34-4 (E1)

B - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 2)

A34-15 (BATT) - A34-4 (E1)

SB - W-B

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

A34-17 (E02) - Body ground

W-B - -

Earth (ground) circuit of ECM

Always

Below 1 Ω

A34-23 (FANH) - A34-4 (E1)

V - W-B

FAN NO. 1 relay operation signal

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

0 to 1.5 V

A34-24 (ST1-) - A34-4 (E1)

Y- 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

11 to 14 V

A34-25 (CANL) - A34-4 (E1)

W - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 1)

A34-26 (CANH) - A34-4 (E1)

B - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 2)

A34-59 (FC) - A34-4 (E1)

G - W-B

Fuel pump control

Ignition switch ON

11 to 14 V

Idling

Below 1.5 V

A34-37 (IGSW) - A34-4 (E1)

B - W-B

Ignition switch signal

Ignition switch ON

11 to 14 V

A34-39 (ELS)*2 - A34-4 (E1)

G - W-B

Tail light signal

Tail light on

11 to 14 V

A34-57 (STP) - A34-4 (E1)

L - W-B

Stop light switch assembly signal

Brake pedal depressed

11 to 14 V

Brake pedal released

Below 1.5 V

A34-41 (SPD) - A34-4 (E1)

Y - W-B

Vehicle speed signal from combination meter assembly signal

Vehicle speed of approximately 20 km/h (12 mph)

Pulse generation

(See waveform 3)

A34-44 (NEO) - A34-4 (E1)

V - W-B

Crankshaft position sensor signal

Idling with warm engine

Pulse generation

(See waveform 4)

A34-45 (TACH) - A34-4 (E1)

P - W-B

Engine speed signal

Idling with warm engine

Pulse generation

(See waveform 5)

A34-46 (STA) - A34-4 (E1)

R - W-B

Starter signal

Ignition switch ON

Below 1.5 V

Cranking

5.5 V or higher

A34-47 (VPA) - A34-48 (EPA)

R - LG

Accelerator pedal position sensor (for engine control)

Ignition switch ON, accelerator pedal fully released

0.7 to 1.2 V

Ignition switch ON, accelerator pedal fully depressed

2.8 to 4.6 V

A34-49 (VCPA) - A34-48 (EPA)

B - LG

Power source of accelerator pedal position sensor (for VPA)

Ignition switch ON

4.5 to 5.5 V

A34-50 (VPA2) - A34-51 (EPA2)

L - V

Accelerator pedal position sensor

Ignition switch ON, accelerator pedal fully released

1.2 to 2.0 V

Ignition switch ON, accelerator pedal fully depressed

3.6 to 4.6 V

A34-52 (VCP2) - A34-51 (EPA2)

W - V

Power source of accelerator pedal position sensor (for VPA2)

Ignition switch ON

4.5 to 5.5 V

A34-54 (PB) - A34-55 (BRE2)

G - B

Vacuum sensor assembly signal

Idling with warm engine, brake pedal released

0.5 to 4.5 V

A34-56 (BRVC) - A34-55 (BRE2)

R - B

Power source of vacuum sensor

Ignition switch ON

4.75 to 5.25 V

A34-33 (TC) - A34-4 (E1)

B - W-B

Terminal TC of DLC3

Ignition switch ON

11 to 14 V

B31-133 (#2) - A34-5 (E01)

Y - W-B

No. 2 fuel injector assembly signal

Ignition switch ON

11 to 14 V

B31-101 (#3) - A34-5 (E01)

R - W-B

No. 3 fuel injector assembly signal

Ignition switch ON

11 to 14 V

B31-102 (#1) - A34-5 (E01)

W - W-B

No. 1 fuel injector assembly signal

Ignition switch ON

11 to 14 V

B31-25 (HT1A) - A34-4 (E1)

L - W-B

Heated oxygen sensor (sensor 1) heater operation signal

Ignition switch ON

11 to 14 V

B31-24 (HT1B) - A34-4 (E1)

V - W-B

Heated oxygen sensor (sensor 2) heater operation signal

Ignition switch ON

11 to 14 V

B31-57 (IGT2) - A34-4 (E1)

B - W-B

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

Idling

Pulse generation

B31-27 (IGT1) - A34-4 (E1)

G - W-B

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

Idling

Pulse generation

B31-28 (EGR2) - A34-4 (E1)

P - W-B

EGR valve assembly operation signal

Engine racing

Pulse generation

B31-29 (EGR1) - A34-4 (E1)

G - W-B

EGR valve assembly operation signal

Engine racing

Pulse generation

B31-103 (M+) - B31-135 (M-)

G - BR

Throttle actuator operation signal

Idling with warm engine

Pulse generation

B31-56 (IGT3) - A34-4 (E1)

LG - W-B

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

Idling

Pulse generation

B31-58 (EGR4) - A34-4 (E1)

V - W-B

EGR valve assembly operation signal

Engine racing

Pulse generation

B31-59 (EGR3) - A34-4 (E1)

Y - W-B

EGR valve assembly operation signal

Engine racing

Pulse generation

B31-73 (OE1+) - B31-72 (OE2-)

L - G

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

Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(See waveform @@)

B31-75 (OCV+) - B31-74 (OCV-)

L - G

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

Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(See waveform 6)

B31-55 (EVP1) - A34-4 (E1)

V - W-B

Purge VSV operation signal

Ignition switch ON

11 to 14 V

B31-77 (VCNE)*2 - A34-4 (E1)

Y - W-B

Power source of crankshaft position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

B31-78 (NE+) - B31-79 (NE-)

P - L*2

B - W*3

Crankshaft position sensor signal

Idling with warm engine

Pulse generation

B31-20 (R) - A34-4 (E1)

R - W-B

Back-up light switch assembly signal

Back-up light switch on

11 to 14 V

A34-28 (D)*4 - A34-4 (E1)

P - W-B

Clutch switch assembly signal

Ignition switch ON, clutch pedal released

Below 1.5 V

Ignition switch ON, clutch pedal depressed

11 to 14 V

B31-80 (EV1+) - B31-81 (EV1-)

R - G

Camshaft position sensor (for exhaust camshaft) signal

Idling with warm engine

Pulse generation

B31-82 (G2+) - B31-114 (G2-)

P - L

Camshaft position sensor (for intake camshaft) signal

Idling with warm engine

Pulse generation

B31-117 (VTA1) - B31-115 (ETA)

GR - P

Throttle position sensor signal (for engine control)

Ignition switch ON, accelerator pedal fully released

0.2 to 1.0 V

Ignition switch ON, accelerator pedal fully depressed

4.0 to 4.8 V

B31-83 (VTA2) - B31-115 (ETA)

R - P

Throttle position sensor signal (for sensor malfunction detection)

Ignition switch ON, accelerator pedal fully released

4.0 to 4.8 V

Ignition switch ON, accelerator pedal fully depressed

0.2 to 1.0 V

B31-128 (THA) - B31-127 (E21)

W - B

Intake air temperature sensor signal (built into manifold absolute pressure sensor)

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

1.5 to 3.0 V

B31-129 (PIM) - B31-127 (E21)

Y - B

Manifold absolute pressure sensor signal

Idling

1.2 to 2.0 V

B31-120 (THW) - B31-121 (ETHW)

R - W

Engine coolant temperature sensor signal

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

0.2 to 1.0 V

B31-100 (#5) - A34-5 (E01)

L - W-B

No. 2 fuel injector assembly signal

Ignition switch ON

11 to 14 V

B31-126 (OX1A) - B31-125 (E11)

W - B

Heated oxygen sensor (sensor 1) signal

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

Pulse generation

B31-124 (OX1B) - B31-123 (E12)

L - P

Heated oxygen sensor (sensor 2) signal

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

Pulse generation

B31-112 (VCE1) - A34-4 (E1)

V - W-B

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

Ignition switch ON

4.5 to 5.5 V

B31-113 (VCG2) - A34-4 (E1)

W - W-B

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

Ignition switch ON

4.5 to 5.5 V

B31-116 (VC) - B31-115 (ETA)

Y - P

Power source of throttle position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

B31-95 (VC2) - B31-127 (E21)

R - B

Power source of manifold absolute pressure sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

B31-97 (KNK1) - B31-96 (EKNK)

B - W

Knock control sensor signal

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 7)

B31-131 (#4) - A34-5 (E01)

G - W-B

No. 1 fuel injector assembly signal

Ignition switch ON

11 to 14 V

B31-132 (#6) - A34-5 (E01)

P - W-B

No. 3 fuel injector assembly signal

Ignition switch ON

11 to 14 V

  • *1: for MMT models

  • *2: w/ Stop and Start System

  • *3: w/o Stop and Start System

  • *4: for M/T models

  1. WAVEFORM 1

    A283577E05
    Table 1. CAN Communication Signal (Reference)

    ECM Terminal Name

    Between CANL and E1

    Between 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.

  2. WAVEFORM 2

    A283576E06
    Table 2. CAN Communication Signal (Reference)

    ECM Terminal Name

    Between CANH and E1

    Between 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.

  3. WAVEFORM 3

    A207838E05
    Table 3. Vehicle Speed Signal

    ECM Terminal Name

    Between SPD and E1

    Tester Range

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

    Condition

    Vehicle speed of approximately 20 km/h (12 mph)
    Tip:

    The wavelength becomes shorter as the vehicle speed increases.

  4. WAVEFORM 4

    A301717E02
    Table 4. Engine Speed Signal

    ECM Terminal Name

    Between NEO and E1

    Tester Range

    5 V/DIV., 2 ms./DIV.

    Condition

    Idling with warm engine
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  5. WAVEFORM 5

    A283574E05
    Table 5. Engine Speed Signal

    ECM Terminal Name

    Between TACH and E1

    Tester Range

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

    Condition

    Idling with warm engine
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  6. WAVEFORM 6

    A283575E07
    Table 6. 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

    Engine speed maintained at 2500 rpm after warming up engine

  7. WAVEFORM 7

    A283575E07
    Table 7. Camshaft Timing Oil Control Valve Assembly (for Intake Camshaft) Signal

    ECM Terminal Name

    Between OCV+ and OCV-

    Tester Range

    5 V/DIV., 1 ms./DIV.

    Condition

    Engine speed maintained at 2500 rpm after warming up engine

  8. WAVEFORM 8

    A283572E14
    Table 8. 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.