SFI SYSTEM TERMINALS OF ECM

U122287E03
Tip:

The standard voltage, resistance and waveform between each pair of the ECM terminals are 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

A76-1 (BATT) - C111-59 (E1)

P - BR

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

A76-2 (+B) - C111-59 (E1)

B - BR

Power source of ECM

Ignition switch ON

11 to 14 V

A76-3 (+B2) - C111-59 (E1)

B - BR

Power source of ECM

Ignition switch ON

11 to 14 V

A76-5 (ELS1) - C111-59 (E1)

G - BR

Electric load

Taillight switch on

7.5 to 14 V

Taillight switch off

Below 1.5 V

A76-6 (IGSW) - C111-59 (E1)

B - BR

Ignition switch

Ignition switch ON

11 to 14 V

A76-9 (STP) - C111-59 (E1)

V - BR

Stop light switch

Brake pedal depressed

11 to 14 V

Brake pedal released

Below 1.5 V

A76-10 (ST1-) - C111-59 (E1)

R-L - BR

Stop light switch

Ignition switch ON, Brake pedal depressed

Below 1.5 V

Ignition switch ON, Brake pedal released

11 to 14 V

A76-13 (CANH) - C111-59 (E1)

Y - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 1)

A76-23 (NSW) - C111-59 (E1)*1

G - BR

Park/neutral position switch

Ignition switch ON, shift lever in P or N

Below 1.5 V

Ignition switch ON, shift lever not in P or N

6.0 V or higher

A76-26 (CANL) - C111-59 (E1)

W - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 2)

A76-27 (W) - C111-59 (E1)

LG - BR

MIL

Ignition switch ON (MIL goes off)

Below 3.0 V

Idling

11 to 14 V

A76-29 (STA) - C111-59 (E1)

LG - BR

Starter signal

Cranking

5.5 V or higher

A76-30 (NEO) - C111-59 (E1)*2

P - BR

Engine speed signal to power management control ECU

Idling with warm engine

Pulse generation

(See waveform 3)

A76-31 (TACH) - C111-59 (E1)

GR - BR

Engine speed

Idling

Pulse generation

(See waveform 4)

A76-32 (EC) - Body ground

W-B - Body ground

Ground circuit of ECM

Always

Below 1 Ω

A76-33 (TC) - C111-59 (E1)

P - BR

Terminal TC of DLC3

Ignition switch ON

11 to 14 V

A76-34 (ELS2) - C111-59 (E1)

B - BR

Electric load

Defogger switch on

7.5 to 14 V

Defogger switch off

Below 1.5 V

A76-41 (FC) - C111-59 (E1)

R - BR

Fuel pump control

Ignition switch ON

11 to 14 V

Idling

Below 1.5 V

A76-44 (SPD) - C111-59 (E1)

Y - BR

Speed signal from combination meter

Vehicle being driven at 20 km/h (12 mph)

Pulse generation

(See waveform 5)

A76-46 (MREL) - C111-59 (E1)

L - BR

EFI MAIN relay

Ignition switch ON

11 to 14 V

A76-47 (VPA) - A76-48 (EPA)

L-W - R

Accelerator pedal position sensor (for engine control)

Ignition switch ON, Accelerator pedal released

0.5 to 1.1 V

Ignition switch ON, Accelerator pedal fully depressed

2.6 to 4.5 V

A76-49 (VCPA) - A76-48 (EPA)

P-L - R

Power source of accelerator pedal position sensor (for VPA)

Ignition switch ON

4.5 to 5.5 V

A76-50 (VPA2) - A76-51 (EPA2)

Y - P

Accelerator pedal position sensor (for sensor malfunctioning detection)

Ignition switch ON, Accelerator pedal released

1.2 to 2.0 V

Ignition switch ON, Accelerator pedal fully depressed

3.4 to 4.75 V

A76-52 (VCP2) - A76-51 (EPA2)

B - P

Power source of accelerator pedal position sensor (for VPA2)

Ignition switch ON

4.5 to 5.5 V

A76-60 (RFC) - C111-59 (E1)

R-G - BR

Cooling fan control

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

Pulse generation

(See waveform 6)

C111-26 (E04) - Body ground

W-B - Body ground

Ground circuit of ECM

Always

Below 1 Ω

C111-27 (HA1A) - C111-26 (E04)

R - W-B

Air fuel ratio sensor heater (sensor 1)

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 7)

C111-28 (ME01) - Body ground

W-B - Body ground

Ground circuit of ECM

Always

Below 1 Ω

C111-29 (+BM) - C111-59 (E1)

B - BR

Power source of throttle actuator

Always

11 to 14 V

C111-30 (M-) - C111-28 (ME01)

W - W-B

Throttle actuator

Idling with warm engine

Pulse generation

(See waveform 8)

C111-31 (CAN+) - C111-59 (E1)

Y - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 1)

C111-32 (CAN-) - C111-59 (E1)

W - BR

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 2)

C111-33 (PRG) - C111-59 (E1)

L-B - BR

Purge VSV

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 9)

C111-35 (OC1+) - C111-34 (OC1-)

B - V

Camshaft timing oil control valve assembly (for Intake side)

Idling

Pulse generation

(See waveform 10)

C111-37 (OE1+) - C111-36 (OE1-)

BR - P

Camshaft timing oil control valve assembly (for Exhaust side)

Idling

Pulse generation

(See waveform 11)

C111-56 (HT1B) - C111-59 (E1)

R - BR

Heated oxygen sensor heater (sensor 2)

Ignition switch ON

11 to 14 V

Idling

Below 3.0 V

C111-57 (E01) - Body ground

BR - Body ground

Ground circuit of ECM

Always

Below 1 Ω

C111-58 (E02) - Body ground

W-B - Body ground

Ground circuit of ECM

Always

Below 1 Ω

C111-59 (E1) - Body ground

BR - Body ground

Ground circuit of ECM

Always

Below 1 Ω

C111-60 (M+) - C111-28 (ME01)

R - W-B

Throttle actuator

Idling with warm engine

Pulse generation

(See waveform 12)

C111-62 (ACIS) - C111-59 (E1)

R-B - BR

Intake air control valve actuator

Ignition switch ON

11 to 14 V

C111-71 (IGF1) - C111-59 (E1)

Y - BR

Ignition coil assembly

(ignition confirmation signal)

Ignition switch ON

4.5 to 5.5 V

Idling

Pulse generation

(See waveform 13)

C111-72 (IGT4) - C111-59 (E1)

B - BR

No. 4 ignition coil assembly

(ignition signal)

Idling

Pulse generation

(See waveform 13)

C111-73 (IGT3) - C111-59 (E1)

L-B - BR

No. 3 ignition coil assembly

(ignition signal)

Idling

Pulse generation

(See waveform 13)

C111-74 (IGT2) - C111-59 (E1)

B - BR

No. 2 ignition coil assembly

(ignition signal)

Idling

Pulse generation

(See waveform 13)

C111-75 (IGT1) - C111-59 (E1)

W-L - BR

No. 1 ignition coil assembly

(ignition signal)

Idling

Pulse generation

(See waveform 13)

C111-77 (VCPM) - C111-76 (EPIM)

R - BR-R

Power source for vacuum sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C111-78 (PIM) - C111-76 (EPIM)

V - BR-R

Vacuum sensor

Vacuum of 67 kPa (500 mmHg) applied

1.3 to 1.9 V

No vacuum applied

3.3 to 3.9 V

C111-79 (PTO) - C111-109 (EPTO)*1

W - B

Oil pressure sensor

Idling and shift lever in P or N (for CVT), or neutral (for Manual Transaxle)

0.8 to 1.2 V

C111-80 (EV1+) - C111-112 (EV1-)

L - R

Camshaft position sensor (Exhaust side)

Idling with warm engine

Pulse generation

(See waveform 14)

C111-82 (VV1+) - C111-115 (VV1-)

G - R

Camshaft position sensor (Intake side)

Idling with warm engine

Pulse generation

(See waveform 14)

C111-89 (THEO) - C111-90 (ETHE)

R - LG

Engine oil temperature sensor

Idling with warm engine

0.3 to 0.85 V

C111-95 (#20) - C111-57 (E01)

Y - BR

No. 2 fuel injector assembly

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 15)

C111-96 (#30) - C111-57 (E01)

G - BR

No. 3 fuel injector assembly

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 15)

C111-97 (#40) - C111-57 (E01)

LG - BR

No. 4 fuel injector assembly

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 15)

C111-98 (#10) - C111-57 (E01)

V - BR

No. 1 fuel injector assembly

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(See waveform 15)

C111-99 (OX1B) - C111-131 (EX1B)

BR - Y

Heated oxygen sensor (sensor 2)

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

Pulse generation

(See waveform 16)

C111-100 (A1A+) - C111-59 (E1)

L - BR

Air fuel ratio sensor (sensor 1)

Ignition switch ON

3.3 V*3

C111-101 (VTA2) - C111-133 (ETA)

R - BR

Throttle position sensor (for sensor malfunction detection)

Ignition switch ON, Accelerator pedal released

2.1 to 3.1 V

Ignition switch ON, Accelerator pedal depressed

4.6 to 5.0 V

C111-108 (GE01) - Body ground

BR - Body ground

Shielded ground circuit of throttle actuator

Always

Below 1 Ω

C111-110 (VCPT) - C111-109 (EPTO)*1

P - B

Power source for oil pressure sensor (fixed voltage)

Ignition switch ON

4.5 to 5.5 V

C111-111 (VCE1) - C111-112 (EV1-)

W - R

Power source for camshaft position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C111-114 (NE+) - C111-113 (NE-)

B - W

Crankshaft position sensor

Idling with warm engine

Pulse generation

(See waveform 17)

C111-116 (VCV1) - C111-115 (VV1-)

W - R

Power source for camshaft position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C111-120 (THW) - C111-119 (ETHW)

B - BR

Engine coolant temperature sensor

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

0.2 to 1.0 V

C111-122 (KNK1) - C111-121 (EKNK)

G - R

Knock sensor

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 18)

C111-132 (A1A-) - C111-59 (E1)

P - BR

Air fuel ratio sensor (sensor 1)

Ignition switch ON

2.9 V*3

C111-134 (VCTA) - C111-133 (ETA)

V - BR

Power source of sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C111-135 (VTA1) - C111-133 (ETA)

P - BR

Throttle position sensor (for engine control)

Ignition switch ON, Throttle valve fully closed

0.5 to 1.1 V

Ignition switch ON, Throttle valve fully open

3.2 to 4.8 V

C111-136 (SDWN) - C111-59 (E1)

G - BR

Continuously variable valve lift controller

Ignition switch ON

11 to 14 V

C111-137 (VG) - C111-104 (E2G)

V - R

Mass air flow meter

Idling, Shift lever in P or N (for CVT) or neutral (for Manual Transaxle), air conditioner OFF

0.5 to 3.0 V

C111-138 (THA) - C111-139 (ETHA)

P - BR-W

Intake air temperature sensor

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

0.5 to 3.4 V

  • *1: for CVT

  • *2: w/ Entry and Start System

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

  1. WAVEFORM 1

    A389937E01
    Table 1. CAN Communication Signal

    ECM Terminal Name

    Between CANH and E1

    Between CAN+ and E1

    Tester Range

    1 V/DIV., 10 μs./DIV.

    Condition

    Engine stop and ignition switch ON
    Tip:

    The waveform varies depending on the CAN communication signal.

  2. WAVEFORM 2

    A389938E01
    Table 2. CAN Communication Signal

    ECM Terminal Name

    Between CANL and E1

    Between CAN- and E1

    Tester Range

    1 V/DIV., 10 μs./DIV.

    Condition

    Engine stop and ignition switch ON
    Tip:

    The waveform varies depending on the CAN communication signal.

  3. WAVEFORM 3

    A287796E20
    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

  4. WAVEFORM 4

    A389939E01
    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

    A389940E01
    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

    A282867E10
    Table 6. 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)
    Tip:

    The duty ratio varies depending on the engine coolant temperature.

  7. WAVEFORM 7

    A168188E01
    Table 7. Air Fuel Ratio Sensor Heater

    ECM Terminal Name

    Between HA1A and E04

    Tester Range

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

    Condition

    Idling with warm engine
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8

    A245848E03
    Table 8. Throttle Actuator Negative Terminal

    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.

  9. WAVEFORM 9

    A149742E02
    Table 9. Purge VSV

    ECM Terminal Name

    Between PRG and E1

    Tester Range

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

    Condition

    Idling
    Tip:

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

  10. WAVEFORM 10

    A389941E01
    Table 10. Camshaft Timing Oil Control Valve Assembly for Intake Camshaft

    ECM Terminal Name

    Between OC1+ and OC1-

    Tester Range

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

    Condition

    Idling

  11. WAVEFORM 11

    A389941E01
    Table 11. Camshaft Timing Oil Control Valve Assembly for Exhaust Camshaft

    ECM Terminal Name

    Between OE1+ and OE1-

    Tester Range

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

    Condition

    Idling

  12. WAVEFORM 12

    A208000E05
    Table 12. Throttle Actuator Positive Terminal

    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.

  13. WAVEFORM 13

    A122717E14
    Table 13. Ignition Coil Signal (IGT and IGF Signal)

    ECM Terminal Name

    Between IGT (1 to 4) and E1

    Between IGF1 and E1

    Tester Range

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

    Condition

    Idling
    Tip:

    The wavelength becomes shorter as the engine speed increases.

  14. WAVEFORM 14

    A255508E38
    Table 14. Camshaft Position Sensor

    ECM Terminal Name

    Between VV1+ and VV1-

    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.

  15. WAVEFORM 15

    A389942E01
    Table 15. No. 1 (to No. 4) Fuel Injector 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.

  16. WAVEFORM 16

    A389943E01
    Table 16. Heated Oxygen Sensor

    ECM Terminal Name

    Between OX1B and EX1B

    Tester Range

    0.2 V/DIV., 200 ms./DIV.

    Condition

    Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor
    Tip:

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

  17. WAVEFORM 17

    A254145E01
    Table 17. Crankshaft Position Sensor

    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.

  18. WAVEFORM 18

    A389944E01
    Table 18. Knock Sensor

    ECM Terminal Name

    Between KNK1 and EKNK

    Tester Range

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

    Condition

    Maintain engine speed 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.