SFI SYSTEM TERMINALS OF ECM

A01XJ3ZE02
*A for Automatic Transmission Models *B for Manual Transmission Models

Tech Tips

The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the STD Voltages column. The illustration above can be used as a reference to identify the ECM terminal locations.

Terminal No. (Symbol) Wiring Color Terminal Descriptions Conditions STD Voltages
G180-3 (BATT) - C153-3 (E1) L - BR Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
C153-5 (+BM) - C153-3 (E1) PL - BR Power source of throttle actuator Always 11 to 14 V
G180-8 (IGSW) - C153-3 (E1) W - BR Ignition switch signal Ignition switch ON 11 to 14 V
G180-1 (+B) - C153-3 (E1) W - BR Power source of ECM Ignition switch ON 11 to 14 V
G180-2 (+B2) - C153-3 (E1) W - BR Power source of ECM Ignition switch ON 11 to 14 V
C153-11 (OC1+) - C153-10 (OC1-) G-Y - L-B Camshaft timing oil control valve assembly operation signal (for intake side) Idling

Pulse generation

(See waveform 1)
C153-9 (OE1+) - C153-8 (OE1-) G - L Camshaft timing oil control valve assembly operation signal (for exhaust side) Idling

Pulse generation

(See waveform 2)
G181-6 (MREL) - C153-3 (E1) V - BR EFI-MAIN relay operation signal Ignition switch ON 11 to 14 V
C154-24 (VG) - C154-32 (E2G) W-R - B-W Mass air flow meter sub-assembly signal Idling, Shift position P or N, A/ C switch OFF 0.5 to 3.0 V
C154-23 (THA) - C154-32 (E2G) Y-B - B-W Intake air temperature sensor signal Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
C154-22 (THW) - C154-30 (ETHW) R-L - L-B Engine coolant temperature sensor signal Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
C153-29 (VCTA) - C153-28 (ETA) B-W Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
C153-30 (VTA1) - C153-28 (ETA) LG - W 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
C153-18 (VTA2) - C153-28 (ETA) G-W - W 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
G180-26 (VPA) - G180-27 (EPA) L - P 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
G180-28 (VPA2) - G180-29 (EPA2) GR - W Accelerator pedal position sensor signal (for sensor malfunction 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
G180-20 (VCPA) - G180-27 (EPA) LG - P Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
G180-22 (VCP2) - G180-29 (EPA2) R - W Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
C154-6 (HA1A) - C154-5 (E04) R-L - BR Air fuel ratio sensor heater operation signal Idling

Pulse generation

(See waveform 3)
Ignition switch ON 11 to 14 V
C154-26 (A1A+) - C153-3 (E1) P - BR Air fuel ratio sensor signal Ignition switch ON 3.3 V*1
C154-34 (A1A-) - C153-3 (E1) L - BR Air fuel ratio sensor signal Ignition switch ON 2.9 V*1
C154-7 (HT1B) - C154-5 (E04) L-R - BR Heated oxygen sensor heater operation signal Idling Below 3.0 V
Ignition switch ON 11 to 14 V
C154-27 (OX1B) - C154-35 (EX1B) W - B Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 4)
C154-4 (#10) - C153-1 (E01) L - W-B fuel injector assembly signal Ignition switch ON 11 to 14 V
C154-3 (#20) - C153-1 (E01) G - W-B
C154-2 (#30) - C153-1 (E01) R - W-B Idling

Pulse generation

(See waveform 5)
C154-1 (#40) - C153-1 (E01) W - W-B
C154-20 (KNK1) - C154-28 (EKNK) B-W Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 6)
C153-23 (VV1+) - C153-22 (VV1-) B - G Camshaft position sensor signal (for intake side) Idling with warm engine

Pulse generation

(See waveform 7)
C153-24 (EV1+) - C153-32 (EV1-) G-B - R-W Camshaft position sensor signal (for exhaust side) Idling with warm engine

Pulse generation

(See waveform 7)
C153-27 (NE+) - C153-34 (NE-) W -B Crankshaft position sensor signal Idling with warm engine

Pulse generation

(See waveform 8)
C153-16 (IGT1) - C153-3 (E1) R-Y - BR

Ignition coil assembly

(ignition signal)

 Idling

Pulse generation

(See waveform 9)
C153-15 (IGT2) - C153-3 (E1) R-L - BR
C153-14 (IGT3) - C153-3 (E1) G-B - BR
C153-13 (IGT4) - C153-3 (E1) G-W - BR
C153-12 (IGF1) - C153-3 (E1) G-R - BR Ignition coil assembly (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling

Pulse generation

(See waveform 9)
C154-13 (PRG) - C153-1 (E01) P - W-B Purge VSV operation signal Ignition switch ON 11 to 14 V
Idling, under purge control

Pulse generation

(See waveform 10)
G181-23 (SPD) - C153-3 (E1) R - BR Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 11)
C154-17 (STA) - C153-3 (E1) W - BR Starter signal Shift position N, ignition switch START 5.5 V or higher
C154-8 (PSW) - C153-3 (E1) G - BR Power steering oil pressure switch While turning steering wheel Below 1.5 V
C154-15 (NSW)*2 - C153-3 (E1) B - 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 3.0 V
G180-10 (STP) - C153-3 (E1) V - BR Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
G180-11 (ST1-) - C153-3 (E1) B - 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
C153-7 (M+) - C153-4 (ME01) P - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See waveform 12)
C153-6 (M-) - C153-4 (ME01) L - W-B Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(See waveform 13)
G181-5 (FC) - C153-1 (E01) G - W-B Fuel pump control Ignition switch ON 11 to 14 V
G180-19 (TC) - C153-3 (E1) V - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
G181-11 (TACH) - C153-3 (E1) P - BR Engine speed Idling

Pulse generation

(See waveform 14)
C153-21 (VCV1) - C153-3 (E1) L-W - BR Power source of camshaft position sensor (for intake side) (specific voltage) Ignition switch ON 4.5 to 5.5 V
C153-31 (VCE1) - C153-3 (E1) P-L - BR Power source of camshaft position sensor (for exhaust side) (specific voltage) Ignition switch ON 4.5 to 5.5 V
G181-13 (CANH) - C153-3 (E1) LG - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 15)
G181-14 (CANL) - C153-3 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 16)
G180-5 (AIRV) - C153-3 (E1) P - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
G180-6 (AIRP) - C153-3 (E1) GR - BR Air pump control Ignition switch ON 11 to 14 V
G181-20 (AIDI) - C153-3 (E1) G - BR Diagnostic information signal for secondary air injection system Secondary air injection system operates

Pulse generation

(See waveform 17)
C153-20 (VCAI) - C153-25 (EAIP) W - B Power source of air pressure sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
C153-26 (AIP) - C153-25 (EAIP) R - B Air pressure sensor Ignition switch ON 0.5 to 4.5 V
G180-16 (NEO)*3 - C153-3(E1) P - BR Crankshaft position sensor signal sent to certification ECU (smart key ECU assembly) Idling with warm engine

Pulse generation

(See waveform 18)
G181-4 (HAI1) - C153-3 (E1) W - BR Air pump heater for secondary air injection system Air pump heater operating 11 to 14 V

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

*2: for Automatic Transmission Models.

*3: w/ Entry and Start System.


  1. WAVEFORM 1


    1. A01XKJAE01
      *a 5 V/DIV.
      *b 1 ms./DIV.

      Camshaft Timing Oil Control Valve Assembly (for Intake Side) Operation Signal

      ECM Terminal Names Between OC1+ and OC1-
      Tester Ranges 5 V/DIV., 1 ms./DIV.
      Conditions Idling

  2. WAVEFORM 2


    1. A01XEGTE01
      *a 5 V/DIV.
      *b 1 ms./DIV.

      Camshaft Timing Oil Control Valve Assembly (for Exhaust Side) Operation Signal

      ECM Terminal Names Between OE1+ and OE1-
      Tester Ranges 5 V/DIV., 1 ms./DIV.
      Conditions Idling

  3. WAVEFORM 3


    1. A01XJG5E04
      *a 5 V/DIV.
      *b 10 ms./DIV.

      Air Fuel Ratio Sensor (Sensor 1) Heater Operation Signal

      ECM Terminal Names Between HA1A and E04
      Tester Ranges 5 V/DIV., 10 ms./DIV.
      Conditions Idling

      Tech Tips

      The wavelength varies in accordance with the engine operating condition.

  4. WAVEFORM 4


    1. A01XLFDE01
      *1 0.2 V/DIV.
      *2 200 ms./DIV.

      Heated Oxygen Sensor (Sensor 2) Signal

      ECM Terminal Names Between OX1B and EX1B
      Tester Ranges 0.2 V/DIV., 200 ms./DIV.
      Conditions Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

      Tech Tips

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

  5. WAVEFORM 5


    1. A01XL1CE01
      *1 20 V/DIV.
      *2 20 ms./DIV.

      No. 1 (to No. 4) Fuel Injector Assembly Signal

      ECM Terminal Names Between #10 (to #40) and E01
      Tester Ranges 20 V/DIV., 20 ms./DIV.
      Conditions Idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

  6. WAVEFORM 6


    1. A01XM7JE05
      *a 1 V/DIV
      *b 1 ms/DIV

      Knock Control Sensor Signal

      ECM Terminal Names Between KNK1 and EKNK
      Tester Ranges 1 V/DIV., 1 ms./DIV.
      Conditions Engine speed maintained at 4000 rpm after warming up engine

      Tech Tips


      • The wavelength becomes shorter as the engine speed increases.

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

  7. WAVEFORM 7


    1. A01XE8RE24
      *a 5 V/DIV.
      *b 20 msec./DIV.

      Camshaft Position Sensor Signal (for Intake and Exhaust Side)

      ECM Terminal Names

      CH1: Between VV1+ and VV1-

      CH2: Between EV1+ and EV1-
      Tester Ranges 5 V/DIV., 20 ms./DIV.
      Conditions Idling

      Tech Tips


      • The wavelength becomes shorter as the engine speed increases.

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

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8


    1. A01XHLAE10
      *a 5 V/DIV.
      *b 20 ms./DIV.

      Crankshaft Position Sensor Signal

      ECM Terminal Names Between NE+ and NE
      Tester Ranges 5 V/DIV., 20 ms./DIV.
      Conditions idling

      • The wavelength becomes shorter as the engine speed increases.

  9. WAVEFORM 9


    1. A01XG2VE01
      *a 2 V/DIV
      *b 20 ms./DIV.

      Ignition Coil Assembly Signal (IGT and IGF Signal)

      ECM Terminal Names

      (a): Between IGT (1 to 4) and E1

      (b): Between IGF1 and E1
      Tester Ranges 2 V/DIV., 20 ms./DIV.
      Conditions idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

  10. WAVEFORM 10


    1. B001IDCE09
      *1 10 V/DIV.
      *2 20 msec./DIV.

      Purge VSV Signal

      ECM Terminal Names Between PRG and E01
      Tester Ranges 10 V/DIV., 20 ms./DIV.
      Conditions Idling, under purge control

      Tech Tips

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

  11. WAVEFORM 11


    1. A01XCOPE01
      *a 5 V/DIV.
      *b 20 ms./DIV.

      Vehicle speed signal

      ECM Terminal Names Between SPD and E1
      Tester Ranges 5 V/DIV, 20 msec./DIV
      Conditions Driving at 20 km/h (12 mph)

      Tech Tips

      The wavelength becomes shorter as the vehicle speed increases.

  12. WAVEFORM 12


    1. A01XE75E32
      *a 5 V/DIV.
      *b 1 msec./DIV.

      Throttle Actuator Positive Terminal Signal

      ECM Terminal Names Between M+ and ME01
      Tester Ranges 5 V/DIV., 1 ms./DIV.
      Conditions Idling with warm engine

      The duty ratio varies depending on the throttle actuator operation.

  13. WAVEFORM 13


    1. A01XJL4E32
      *a 5 V/DIV.
      *b 1 msec./DIV.

      Throttle Actuator Negative Terminal Signal

      ECM Terminal Names Between M- and ME01
      Tester Ranges 5 V/DIV., 1 ms./DIV.
      Conditions Idling with warm engine

      The duty ratio varies depending on the throttle actuator operation.

  14. WAVEFORM 14


    1. A01XJUQE01
      *a 5 V/DIV.
      *b 10 ms./DIV.

      Engine Speed Signal

      ECM Terminal Names Between TACH and E1
      Tester Ranges 5 V/DIV., 10 ms./DIV.
      Conditions Idling

      Tech Tips


      • The wavelength becomes shorter as the engine speed increases.

  15. WAVEFORM 15


    1. A01XGSRE01
      *a 1 V/DIV.
      *b 10 μs./DIV.

      CAN Communication Signal (Reference)

      ECM Terminal Names Between CANH and E1
      Tester Ranges 1 V/DIV., 10 μs./DIV.
      Conditions Ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.

  16. WAVEFORM 16


    1. A01XK1IE02
      *a 1 V/DIV.
      *b 10 μs./DIV.

      CAN Communication Signal (Reference)

      ECM Terminal Names Between CANL and E1
      Tester Ranges 1 V/DIV., 10 μs./DIV.
      Conditions Ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.

  17. WAVEFORM 17


    1. A01XKKVE06
      *a 5 V/DIV.
      *b 50 ms./DIV.

      Terminal DI of Air Injection Control Driver

      ECM Terminal Names Between AIDI and E1
      Tester Ranges 5 V/DIV., 50 ms./DIV.
      Conditions

      Performing Active Test using GTS

      (secondary air injection system)

  18. WAVEFORM 18


    1. A01XCVTE01
      *a 2ms./DIV.

      Crankshaft Position Sensor Signal

      ECM Terminal Names Between NEO and E1
      Tester Ranges 2 V/DIV., 2 ms./DIV.
      Conditions Idling with warm engine

      Tech Tips

      The waveform varies depending on the CAN communication signal.