SFI SYSTEM TERMINALS OF ECM

A005KA9E02

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 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
A58-1 (BATT) - B23-16 (E1) Y - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A58-2 (+B) - B23-16 (E1) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A58-3 (+B2) - B23-16 (E1) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
B23-29 (+BM) - B23-16 (E1) GR - W-B Power source of throttle actuator Always 11 to 14 V
B23-57 (IGT1) - B23-16 (E1) W - W-B No. 1 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 1)
B23-56 (IGT2) - B23-16 (E1) V - W-B No. 2 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 1)
B23-55 (IGT3) - B23-16 (E1) G - W-B No. 3 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 1)
B23-54 (IGT4) - B23-16 (E1) LG - W-B No. 4 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 1)
B23-102 (IGF1) - B23-16 (E1) Y - W-B

Ignition coil assembly

(ignition confirmation signal)

 Idling with warm engine

Pulse generation

(See waveform 1)
B23-78 (NE+) - B23-110 (NE-) P - Y Crank position sensor signal Idling with warm engine

Pulse generation

(See waveform 2)
B23-82 (VV1+) - B23-114 (VV1-) V - P Cam position sensor signal Idling with warm engine

Pulse generation

(See waveform 3)
B23-20 (#10) - B23-51 (E01) B - BR No. 1 fuel injector assembly signal Idling with warm engine

Pulse generation

(See waveform 4)
B23-17 (#20) - B23-51 (E01) GR - BR No. 2 fuel injector assembly signal Idling with warm engine

Pulse generation

(See waveform 4)
B23-18 (#30) - B23-51 (E01) P - BR No. 3 fuel injector assembly signal Idling with warm engine

Pulse generation

(See waveform 4)
B23-19 (#40) - B23-51 (E01) L - BR No. 4 fuel injector assembly signal Idling with warm engine

Pulse generation

(See waveform 4)
B23-23 (HA1A) - B23-52 (E04) G - W-B Air fuel ratio sensor heater operation signal Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 5)
B23-133 (A1A+) - B23-16 (E1) R - W-B Air fuel ratio sensor signal Ignition switch ON Below 3.3 V*
B23-134 (A1A-) - B23-16 (E1) G - W-B Air fuel ratio sensor signal Ignition switch ON Below 3.0 V*
B23-22 (HT1B) - B23-51 (E01) L - BR Heated oxygen sensor heater operation signal Idling Below 3.0 V
Ignition switch ON 11 to 14 V
B23-103 (OX1B) - B23-135 (EX1B) B - GR Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 6)
B23-123 (KNK1) - B23-124 (EKNK) R - G Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 7)
A58-44 (SPD) - B23-16 (E1) V - W-B Vehicle speed signal from combination meter signal Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 8)
B23-93 (THW) - B23-94 (ETHW) V - BR Engine coolant temperature sensor signal Idling, engine coolant temperature 75 to 100°C (167 to 212°F) 0.2 to 1.0 V
B23-90 (THA) - B23-122 (ETHA) P - G Intake air temperature sensor signal Idling, intake air temperature 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
B23-91 (VG) - B23-92 (E2G) GR - L Mass air flow meter sub-assembly signal Idling, shift lever position P or N, air conditioner OFF 0.5 to 3.0 V
A58-27 (W) - B23-16 (E1) B - W-B Malfunction Indicator Lamp (MIL) operation signal Ignition switch ON (MIL goes off) Below 1.5 V
Idling with warm engine 11 to 14 V
B23-63 (NSW) - B23-16 (E1) BE - W-B Park/neutral 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
A58-22 (STA) - B23-16 (E1) BR - W-B Starter assembly signal Cranking 6 V or more
B23-84 (VTA1) - B23-116 (ETA) Y - V 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
B23-83 (VTA2) - B23-116 (ETA) GR - V Throttle position sensor signal (for engine control) 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
B23-115 (VCTA) - B23-116 (ETA) W - V Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
A58-53 (VCPA) - A58-52 (EPA) G - R Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A58-51 (VPA) - A58-52 (EPA) R - R 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
A58-54 (VPA2) - A58-55 (EPA2) L - B 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
A58-56 (VCP2) - A58-55 (EPA2) W - B Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B23-60 (M+) - B23-59 (ME01) G - BR Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See waveform 9)
B23-30 (M-) - B23-59 (ME01) BR - BR Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(See waveform 10)
A58-9 (STP) - B23-16 (E1) G - W-B Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A58-10 (ST1-) - B23-16 (E1) Y - W-B

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
B23-76 (PRG) - B23-16 (E1) L - W-B Purge VSV operation signal Ignition switch ON 11 to 14 V
Idling with warm engine, under purge control

Pulse generation

(See waveform 11)
A58-21 (FC) - B23-16 (E1) V - W-B Fuel pump control Ignition switch ON 11 to 14 V
A58-23 (TC) - B23-16 (E1) L - W-B Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A58-31 (TACH) - B23-16 (E1) LG - W-B Engine speed signal Idling

Pulse generation

(See waveform 12)
B23-75 (OC1+) - B23-74 (OC1-) BR - Y Camshaft timing oil control valve assembly operation signal Idling

Pulse generation

(See waveform 13)
A58-13 (CANH) - B23-16 (E1) L - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 14)
A58-26 (CANL) - B23-16 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 15)
A58-37 (IGSW) - B23-16 (E1) R - W-B Ignition switch signal Ignition switch ON 11 to 14 V
A58-46 (MREL) - B23-16 (E1) GR - W-B EFI MAIN relay operation signal Ignition switch ON 11 to 14 V
B23-28 (EGR1) - B23-16 (E1) R - W-B EGR valve assembly signal EGR valve operating

Pulse generation

(See waveform 16)
B23-27 (EGR2) - B23-16 (E1) LG - W-B EGR valve assembly signal EGR valve operating

Pulse generation

(See waveform 17)
B23-26 (EGR3) - B23-16 (E1) W - W-B EGR valve assembly signal EGR valve operating

Pulse generation)

(See waveform 16)
B23-25 (EGR4) - B23-16 (E1) Y - W-B EGR valve assembly signal EGR valve operating

Pulse generation

(See waveform 17)
A58-4 (ELS1) - B23-16 (E1) G - W-B Electric load signal Tail light switch on 11 to 14 V
Tail light switch off Below 1.5 V
A58-17 (ELS2) - B23-16 (E1) B - W-B Electric load signal Defogger switch on 11 to 14 V
Defogger switch off Below 1.5 V
B23-100 (ALT) - B23-16 (E1) G - W-B Generator assembly signal Ignition switch ON 11 to 14 V
A58-7 (FANL) - B23-16 (E1) R - W-B Cooling fan motor (low) operation signal Ignition switch ON 11 to 14 V

Idling with A/C ON or

High engine coolant temperature

 Below 1.5 V
A58-8 (FANH) - B23-16 (E1) G - W-B Cooling fan motor (high) operation signal Idling with high engine coolant temperature Below 1.5 V
A58-30 (NEO) - B23-16 (E1) V - W-B Crank position sensor signal Idling with warm engine

Pulse generation)

(See waveform 18)
B23-109 (VCNE) -B23-110 (NE-) B - Y Power source of crank position sensor Ignition switch ON 4.5 to 5.5V
B23-16 (E1) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B23-51 (E01) - Body ground BR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B23-21 (E02) - Body ground BR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B23-52 (E04) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
A58-50 (EC) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B23-59 (ME01) - Body ground BR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
B23-58 (GE01) - Body ground BR - Body ground Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω

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


  1. WAVEFORM 1

    A005KU1E43
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Ignition Coil Assembly Signal (IGT and IGF Signal)
    ECM Terminal Names

    Between IGT (1 to 4) and E1

    Between IGF1 and E1
    Tester Ranges 2 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  2. WAVEFORM 2

    A005M33E13
    *a 2 V/DIV.
    *b 10 ms./DIV.
    Crank Position Sensor Signal
    ECM Terminal Names Between NE+ and NE-
    Tester Ranges 2 V/DIV., 10 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  3. WAVEFORM 3

    A005LPYE02
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Cam Position Sensor Signal
    ECM Terminal Names Between VV1+ and VV1-
    Tester Ranges 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    A005L3KE02
    *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.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  5. WAVEFORM 5

    A005KVNE01
    *a 5 V/DIV.
    *b 10 ms./DIV.
    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

    Tech Tips

    The duty ratio varies depending on the engine operating condition.

  6. WAVEFORM 6

    A005LRKE05
    *1 0.2 V/DIV.
    *2 200 ms./DIV.
    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

    Tech Tips

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

  7. WAVEFORM 7

    A005LLDE03
    *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.
    Condition 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.

  8. WAVEFORM 8

    A005JXAE01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Vehicle Speed Signal
    ECM Terminal Names Between SPD and E1
    Tester Ranges 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.

  9. WAVEFORM 9

    A005GSPE03
    *a 5 V/DIV.
    *b 1 ms./DIV.
    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

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  10. WAVEFORM 10

    A005JL7E01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    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

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  11. WAVEFORM 11

    A005LL5E01
    *1 10 V/DIV.
    *2 20 ms./DIV.
    Purge VSV Operation Signal
    ECM Terminal Names Between PRG and E1
    Tester Ranges 10 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine, 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.

  12. WAVEFORM 12

    A005HPQE01
    *a 5 V/DIV.
    *b 10 ms./DIV.
    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.

  13. WAVEFORM 13

    A005LNSE03
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  14. WAVEFORM 14

    A005LG6E01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANH and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  15. WAVEFORM 15

    A005JX1E01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANL and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  16. WAVEFORM 16

    A005K54E05
    *1 10 V/DIV.
    *2 20 ms./DIV.
    EGR Valve Assembly Signal (EGR1, EGR3)
    ECM Terminal Name

    Between EGR 1 and E1

    Between EGR 3 and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition EGR valve operating

  17. WAVEFORM 17

    A005GFEE05
    *1 10 V/DIV.
    *2 20 ms./DIV.
    EGR Valve Assembly Signal (EGR2, EGR4)
    ECM Terminal Name

    Between EGR 2 and E1

    Between EGR 4 and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition EGR valve operating

  18. WAVEFORM 18

    A005GEBE02
    *a 1 V/DIV.
    *b 2 ms./DIV.
    Crank Position Sensor Signal
    ECM Terminal Name Between NEO and E1
    Tester Range 1 V/DIV., 2 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.