SFI SYSTEM TERMINALS OF ECM

A01IRZDE13

Tech Tips

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 Conditions" 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
A51-20 (BATT) - C68-105 (E1) P - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A51-2 (+B) - C68-105 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
A51-1 (+B2) - C68-105 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
A51-3 (+BM) - C68-105 (E1) B - BR Power source of throttle actuator Always 11 to 14 V
C68-109 (IGT1) - C68-105 (E1) W-L - BR

Ignition coil

(ignition signal)

 Idling

Pulse generation

(See waveform 1)
C68-108 (IGT2) - C68-105 (E1) B - BR
C68-107 (IGT3) - C68-105 (E1) L-B - BR
C68-106 (IGT4) - C68-105 (E1) B - BR
C68-82 (IGF1) - C68-105 (E1) Y - BR

Ignition coil

(ignition confirmation signal)

 Ignition switch ON 4.5 to 5.5 V
Idling

Pulse generation

(See waveform 1)
C68-93 (NE+) - C68-117 (NE-) B - W Crankshaft position sensor Idling with warm engine

Pulse generation

(See waveform 2)
C68-94 (G2+) - C68-118 (G2-) G - R Variable valve timing (VVT) sensor (Intake side) Idling with warm engine

Pulse generation

(See waveform 2)
C68-86 (#10) - C68-46 (E01) V - BR Injector Ignition switch ON 11 to 14 V
C68-85 (#20) - C68-46 (E01) Y - BR Idling

Pulse generation

(See waveform 3)
C68-84 (#30) - C68-46 (E01) G - BR
C68-83 (#40) - C68-46 (E01) LG - BR
C68-104 (HA1A) - C68-41 (E04) R - W-B Air fuel ratio sensor heater (sensor 1) Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 15)
C68-103 (A1A+) - C68-105 (E1) L - BR Air fuel ratio sensor (sensor 1) Ignition switch ON 3.0 V*1
C68-126 (A1A-) - C68-105 (E1) P - BR Air fuel ratio sensor (sensor 1) Ignition switch ON 3.3 V*1
C68-63 (HT1B) - C68-81 (E03) P - W-B Heated oxygen sensor heater (sensor 2) Ignition switch ON 11 to 14 V
Idling Below 3.0 V
C68-80 (OX1B) - C68-79 (O1B-) BR - Y Heated oxygen sensor (sensor 2) Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

Pulse generation

(See waveform 4)
C68-110 (KNK1) - C68-111 (EKNK) G - R Knock sensor Engine speed maintained at 4000 after warming up engine

Pulse generation

(See waveform 5)
A51-38 (SPD) - C68-105 (E1) Y - BR Speed signal from combination meter Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 6)
C68-64 (THW) - C68-65 (ETHW) B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
C68-87 (THA) - C68-88 (ETHA) P - BR-W Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
C68-69 (VG) - C68-92 (E2G) V - R Mass air flow meter Idling, Shift lever in neutral, air conditioner OFF 0.5 to 3.0 V
A51-24 (W) - C68-105 (E1) LG - BR MIL Ignition switch ON (MIL goes off) Below 3.0 V
Idling 11 to 14 V
A51-48 (STA) - C68-105 (E1) LG - BR Starter signal Cranking 5.5 V or higher
C68-113 (VTA1) - C68-90 (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
C68-112 (VTA2) - C68-90 (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
C68-89 (VCTA) - C68-90 (ETA) V - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
A51-57 (VCPA) - A51-59 (EPA) P-L - R Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A51-55 (VPA) - A51-59 (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
A51-56 (VPA2) - A51-60 (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 5.0 V
A51-58 (VCP2) - A51-60 (EPA2) B - P Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.0 V
C68-43 (M+) - C68-44 (ME01) P - W-B Throttle actuator Idling with warm engine

Pulse generation

(See waveform 7)
C68-42 (M-) - C68-44 (ME01) L - W-B Throttle actuator Idling with warm engine

Pulse generation

(See waveform 8)
A51-36 (STP) - C68-105 (E1) V - BR Stop light switch Brake pedal depressed 11 to 14 V
Brake pedal released Below 1.5 V
A51-35 (ST1-) - C68-105 (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
C68-62 (PRG) - C68-105 (E1) L-B - BR Purge VSV Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 9)
A51-19 (FC) - C68-105 (E1) R - BR Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
A51-15 (TACH) - C68-105 (E1) GR - BR Engine speed Idling

Pulse generation

(See waveform 10)
A51-41 (TC) - C68-105 (E1) P - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
C68-74 (OC1+) - C68-96 (OC1-) B - V Camshaft timing oil control valve (Intake side) Idling

Pulse generation

(See waveform 11)
A51-8 (CANH) - C68-105 (E1) Y - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 12)
A51-9 (CANL) - C68-105 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 13)
A51-27 (IGSW) - C68-105 (E1) B - BR Ignition switch Ignition switch ON 11 to 14 V
A51-44 (MREL) - C68-105 (E1) L - BR EFI MAIN relay Ignition switch ON 11 to 14 V
C68-75 (OE1+) - C68-97 (OE1-) BR - P Camshaft timing oil control valve (Exhaust side) Idling

Pulse generation

(See waveform 14)
C68-98 (EV1+) - C68-120 (EV1-) L - R Variable valve timing (VVT) sensor (Exhaust side) Idling with warm engine

Pulse generation

(See waveform 2)
C68-119 (VCV1) - C68-105 (E1) W - BR Power source for VVT sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
C68-121 (VCE1) - C68-105 (E1) W - BR Power source for VVT sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
C68-114 (PIM) - C68-91 (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
C68-67 (VCPM) - C68-105 (E1) R - BR Power source for vacuum sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
A51-43 (RFC) - C68-105 (E1) R-G - BR Cooling fan control Ignition switch ON 4.5 to 5.5 V
C68-38 (ACIS) - C68-105 (E1) R-B - BR Intake air control valve actuator Ignition switch ON 11 to 14 V
A51-39 (NEO) - C68-105 (E1)*2 R - BR Engine speed signal to power management control ECU Idling with warm engine

Pulse generation

(See waveform 16)
C68-52 (ALT) - C68-105 (E1) L - BR Generator Ignition switch ON 11 to 14 V
A51-37 (SDWN) - C68-105 (E1) G - BR Continuously variable valve lift controller Ignition switch ON 11 to 14 V
A51-4 (CAN+) - C68-105 (E1) Y - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 12)
A51-5 (CAN-) - C68-105 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 13)
A51-6 (CANP) - C68-105 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 12)
A51-7 (CANN) - C68-105 (E1) R - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 13)
C68-76 (R) - C68-105 (E1) R - BR Back-up light switch Ignition switch ON and shift lever in R 11 to 14 V
Ignition switch ON and shift lever not in R Below 1 V


  1. WAVEFORM 1

    A01IQOFE14
    Igniter IGT signal (from ECM to igniter)
    ECM Terminal Name

    Between IGT (1 to 4) and E1

    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.

  2. WAVEFORM 2

    A01ITWKE11
    Crankshaft position sensor and Variable valve timing (VVT) sensor
    ECM Terminal Name

    Between G2+ and G2-

    Between EV1+ and EV1-

    Between NE+ and NE-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idle after engine warmed-up

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  3. WAVEFORM 3

    A01ISJJE01
    Injector No. 1 (to No. 4) injector 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.

  4. WAVEFORM 4

    A01IOUCE01
    Heated oxygen sensor (bank 1 sensor 2)
    ECM Terminal Name Between OX1B and O1B-
    Tester Range 0.2 V/DIV., 200 ms./DIV.
    Condition Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor

    Tech Tips

    In the Data List, the items O2S B1 S2 show the values input to the ECM from the heated oxygen sensor.

  5. WAVEFORM 5

    A01ISRZE01
    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 engine warmed-up

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

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

  6. WAVEFORM 6

    A01IP3FE03
    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.

  7. WAVEFORM 7

    A01INQ6E04
    Throttle actuator positive terminal
    ECM Terminal Name Between M+ and ME01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idle after engine warmed-up

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  8. WAVEFORM 8

    A01IOQOE04
    Throttle actuator negative terminal
    ECM Terminal Name Between M- and ME01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idle after engine warmed-up

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  9. WAVEFORM 9

    A01IQR8E02
    Purge VSV
    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

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

  10. WAVEFORM 10

    A01IPLHE01
    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.

  11. WAVEFORM 11

    A01IU5CE01
    Camshaft timing oil control valve for intake camshaft
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  12. WAVEFORM 12

    A01IU91E02
    CAN communication signal
    ECM Terminal Name

    Between CANH and E1

    Between CAN+ and E1

    Between CANP and E1
    Tester Range 1 V/DIV., 10 μsec./DIV.
    Condition Engine stop and ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  13. WAVEFORM 13

    A01IU6WE02
    CAN communication signal
    ECM Terminal Name

    Between CANL and E1

    Between CAN- and E1

    Between CANN and E1
    Tester Range 1 V/DIV., 10 μsec./DIV.
    Condition Engine stop and ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  14. WAVEFORM 14

    A01IU5CE01
    Camshaft timing oil control valve for exhaust camshaft
    ECM Terminal Name Between OE1+ and OE1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  15. WAVEFORM 15

    A01IN1XE01
    A/F sensor heater
    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  16. WAVEFORM 16

    A01INZ8E01
    Engine speed signal
    ECM Terminal Name Between NEO and E1
    Tester Range 1 V/DIV., 2 ms./DIV.
    Condition Idling with warm engine