SFI SYSTEM TERMINALS OF ECM

A01WXVAE19

Tech Tips

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
A72-1 (BATT) - F6-16 (E1) L - BR Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) Power switch off 11 to 16 V
A72-2 (+B) - F6-16 (E1) B-R - BR Power source of ECM Power switch on (IG) 11 to 14 V
A72-3 (+B2) - F6-16 (E1) B-R - BR Power source of ECM Power switch on (IG) 11 to 14 V
F6-29 (+BM) - F6-16 (E1) R - BR Power source of throttle actuator Power switch off 11 to 14 V
A72-37 (IGSW) - F6-16 (E1) LG - BR Power switch on (IG) signal Power switch on (IG) 11 to 14 V
F6-74 (OC1+) - F6-75 (OC1-) V - Y Camshaft timing oil control valve assembly (intake camshaft) operation signal Idling

Pulse generation

(See waveform 1)
F6-65 (OE1+) - F6-64 (OE1-) LG - L Camshaft timing oil control valve assembly (exhaust camshaft) operation signal Idling

Pulse generation

(See waveform 2)
A72-46 (MREL) - F6-16 (E1) Y - BR EFI-MAIN relay operation signal Power switch on (IG) 11 to 14 V
F6-91 (VG) - F6-92 (E2G) G - R Mass air flow meter sub-assembly signal Idling, shift lever in P, A/C switch off 0.5 to 3.0 V
F6-93 (THA) - F6-94 (ETHA) Y - LG Intake air temperature sensor signal Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
F6-95 (THW) - F6-96 (ETHW) B - BR Engine coolant temperature sensor signal Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
F6-125 (VCTA) - F6-16 (E1) V - BR Power source of throttle position sensor (specific voltage) Power switch on (IG) 4.5 to 5.5 V
F6-127 (VTA1) - F6-126 (ETA) G - GR Throttle position sensor signal (for engine control) Accelerator pedal fully released 0.5 to 1.1 V
F6-128 (VTA2) - F6-126 (ETA) L - GR Throttle position sensor signal (for sensor malfunction detection) Accelerator pedal fully released 2.1 to 3.1 V
F6-23 (HA1A) - F6-53 (E04) B - W-B Air fuel ratio sensor heater operation signal Idling with cold engine

Pulse generation

(See waveform 3)
Power switch on (IG) 11 to 14 V
F6-133 (A1A+) - F6-16 (E1) R - BR Air fuel ratio sensor signal Power switch on (IG) 3.0 to 3.6 V
F6-134 (A1A-) - F6-16 (E1) G - BR Air fuel ratio sensor signal Power switch on (IG) 2.7 to 3.3 V
F6-24 (HT1B) - F6-53 (E04) Y - W-B Heated oxygen sensor heater operation signal Idling Below 3.0 V
Power switch on (IG) 11 to 14 V
F6-100 (OX1B) - F6-132 (EX1B) SB - P Heated oxygen sensor signal Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(See waveform 4)
F6-20 (#10) - F6-50 (E01) B - W-B No. 1 fuel injector assembly (for port injection) signal Idling with warm engine (port injection control)

Pulse generation

(See waveform 5)
F6-17 (#20) - F6-50 (E01) L - W-B No. 2 fuel injector assembly (for port injection) signal Idling with warm engine (port injection control)

Pulse generation

(See waveform 5)
F6-18 (#30) - F6-50 (E01) GR - W-B No. 3 fuel injector assembly (for port injection) signal Idling with warm engine (port injection control)

Pulse generation

(See waveform 5)
F6-19 (#40) - F6-50 (E01) V - W-B No. 4 fuel injector assembly (for port injection) signal Idling with warm engine (port injection control)

Pulse generation

(See waveform 5)
F6-123 (KNK1) - F6-124 (EKNK) B - W Knock control sensor signal Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(See waveform 6)
F6-113 (VCV1) - F6-16 (E1) LG - BR Power source of camshaft position sensor for intake camshaft (specific voltage) Power switch on (IG) 4.5 to 5.5 V
F6-82 (VV1+) - F6-114 (VV1-) B - V Camshaft position sensor for intake camshaft signal Idling with warm engine

Pulse generation

(See waveform 7)
F6-111 (VCE1) - F6-16 (E1) L - BR Power source of camshaft position sensor for exhaust camshaft (specific voltage) Power switch on (IG) 4.5 to 5.5 V
F6-81 (EV1+) - F6-112 (EV1-) P - W Camshaft position sensor for exhaust camshaft signal Idling with warm engine

Pulse generation

(See waveform 7)
A72-60 (G2O) - F6-16 (E1) B - BR Camshaft revolution signal Idling with warm engine

Pulse generation

(See waveform 8)
F6-76 (NE+) - F6-109 (NE-) R - G Crankshaft position sensor signal Idling with warm engine

Pulse generation

(See waveform 9)
F6-57 (IGT1) - F6-16 (E1) P - BR No. 1 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(See waveform 10)
F6-56 (IGT2) - F6-16 (E1) LG - BR No. 2 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(See waveform 10)
F6-55 (IGT3) - F6-16 (E1) SB - BR No. 3 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(See waveform 10)
F6-54 (IGT4) - F6-16 (E1) V - BR No. 4 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(See waveform 10)
F6-51 (IGF1) - F6-16 (E1) G - BR Ignition coil assembly (ignition confirmation signal) Idling with warm engine

Pulse generation

(See waveform 10)
F6-68 (PRG) - F6-50 (E01) W - W-B Purge VSV signal Power switch on (IG) 11 to 14 V
Idling, under purge control

Pulse generation

(See waveform 11)
F6-60 (M+) - F6-58 (ME01) R - W-B

Throttle actuator operation signal

(positive terminal)

 Idling with warm engine

Pulse generation

(See waveform 12)
F6-30 (M-) - F6-58 (ME01) G - W-B

Throttle actuator operation signal

(negative terminal)

 Idling with warm engine

Pulse generation

(See waveform 13)
A72-21 (FPC) - F6-50 (E01) R - W-B Fuel pump control Power switch on (IG) Below 1.5 V
A72-31 (TACH) - F6-16 (E1) W - BR Engine speed signal Idling with warm engine

Pulse generation

(See waveform 14)
A72-13 (CANH) - F6-16 (E1) R - BR CAN communication line Power switch on (IG)

Pulse generation

(See waveform 15)
A72-26 (CANL) - F6-16 (E1) B - BR CAN communication line Power switch on (IG)

Pulse generation

(See waveform 16)
F6-61 (CAN+) - F6-16 (E1) G - BR CAN communication line Power switch on (IG)

Pulse generation

(See waveform 15)
F6-62 (CAN-) - F6-16 (E1) W - BR CAN communication line Power switch on (IG)

Pulse generation

(See waveform 16)
F6-78 (VCPM) - F6-80 (EPIM) BR - GR Power source of manifold absolute pressure sensor Power switch on (IG) 4.75 to 5.25 V
F6-102 (VCPR) - F6-103 (EPR) P - BR Power source of fuel pressure sensor Power switch on (IG) 4.75 to 5.25 V
F6-101 (PR) - F6-103 (EPR) L - BR Fuel pressure sensor Power switch on (IG) 0.34 to 4.7 V
F6-79 (PIM) - F6-80 (EPIM) Y - GR Manifold absolute pressure sensor signal Power switch on (IG) 3.0 to 5.0 V
F6-28 (EGR1) - F6-16 (E1) G - BR EGR valve assembly EGR valve operating

Pulse generation

(See waveform 17)
F6-27 (EGR2) - F6-16 (E1) L - BR EGR valve assembly EGR valve operating

Pulse generation

(See waveform 17)
F6-26 (EGR3) - F6-16 (E1) GR - BR EGR valve assembly EGR valve operating

Pulse generation

(See waveform 17)
F6-25 (EGR4) - F6-16 (E1) B - BR EGR valve assembly EGR valve operating

Pulse generation

(See waveform 17)
A72-8 (IREL) - F6-50 (E01) G - W-B INJ relay operation signal Power switch on (IG) 0 to 1.5 V
F6-116 (INJ1) - F6-16 (E1) W - BR Fuel injector set (for direct injection) confirmation signal Idling with warm engine (direct injection control)

Pulse generation

(See waveform 18)
F6-117 (INJ2) - F6-16 (E1) B - BR Fuel injector set (for direct injection) confirmation signal Idling with warm engine (direct injection control)

Pulse generation

(See waveform 18)
F6-85 (#1) - F6-16 (E1) LG - BR No. 1 Fuel injector set (for direct injection) signal Idling with warm engine (direct injection control)

Pulse generation

(See waveform 18)
F6-86 (#2) - F6-16 (E1) L - BR No. 2 Fuel injector set (for direct injection) signal Idling with warm engine (direct injection control)

Pulse generation

(See waveform 18)
F6-87 (#3) - F6-16 (E1) R - BR No. 3 Fuel injector set (for direct injection) signal Idling with warm engine (direct injection control)

Pulse generation

(See waveform 18)
F6-88 (#4) - F6-16 (E1) P - BR No. 4 Fuel injector set (for direct injection) signal Idling with warm engine (direct injection control)

Pulse generation

(See waveform 18)
F6-115 (FPF) - F6-16 (E1) G - BR Fuel pump (for high pressure) (spill valve) Idling with warm engine

Pulse generation

(See waveform 19)
F6-118 (FPD) - F6-16 (E1) GR - BR Fuel pump (for high pressure) (spill valve) Idling with warm engine

Pulse generation

(See waveform 19)
A72-44 (RFC) - F6-16 (E1) G - BR Cooling fan control

Power switch on (IG),

A/C switch on (max cool)

Pulse generation

(See waveform 20)
F6-99 (SPCN) - F6-16 (E1) G - BR Drive mode switch (NORMAL mode) Power switch on (IG) 11 to 14 V
Power switch on (IG), NORMAL mode switch being pushed and held (NORMAL mode) 0 to 1.5 V
A72-42 (SPSW)*1 - F6-16 (E1) B - BR Drive mode switch (SPORT mode) Power switch on (IG) 11 to 14 V
Power switch on (IG), SPORT mode switch being turned and held at SPORT position (SPORT mode) 0 to 1.5 V
A72-9 (PWMS)*2 - F6-16 (E1) B - BR Drive mode switch (SPORT mode) Power switch on (IG) 11 to 14 V
Power switch on (IG), SPORT mode switch being turned and held at SPORT position (SPORT mode) 0 to 1.5 V
A72-43 (SNWI) - F6-16 (E1) P - BR SNOW mode switch Power switch on (IG) 11 to 14 V
Power switch on (IG), SNOW mode switch being pushed and held (SNOW mode) 0 to 1.5 V
A72-14 (EC) - body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
F6-16 (E1) - body ground BR- - Earth (ground) circuit of ECM Always Below 1 Ω
F6-50 (E01) - body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
F6-49 (E02) - body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
F6-53 (E04) - body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
F6-58 (ME01) - body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
F6-59 (GE01) - body ground BR - - Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω

*1: w/ Adaptive variable suspension.

*2: w/o Adaptive variable suspension.


  1. WAVEFORM 1

    A01WYSGE05
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly (for Intake Camshaft) Operation Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  2. WAVEFORM 2

    A01WYSGE05
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly (for Exhaust Camshaft) Operation Signal
    ECM Terminal Name Between OE1+ and OE1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  3. WAVEFORM 3

    A01WXNCE01
    *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 with cold engine

  4. WAVEFORM 4

    A01WXPVE04
    *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 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

    A01WXZBE01
    *1 20 V/DIV.
    *2 20 ms./DIV.
    No. 1 (to No. 4) Fuel Injector Assembly (for Port Injection) Signal
    ECM Terminal Name Between #10 (to #40) and E01
    Tester Range 20 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine (port injection control)

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • When the port injection injectors are operating, Port is displayed for Injection Way of the Data List.

  6. WAVEFORM 6

    A01WXFIE10
    *a 1 V/DIV.
    *b 1 ms./DIV.
    Knock Control Sensor Signal
    ECM Terminal Name Between KNK1 and EKNK
    Tester Range 1 V/DIV., 1 ms./DIV.
    Condition Engine speed maintained at 2500 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

    A01WXEHE02
    *a 5 V/DIV.
    *b 20 ms/DIV.
    Camshaft Position Sensor (Intake and Exhaust Camshaft) Signal
    ECM Terminal Name

    CH1: Between VV1+ and VV1-

    CH2: Between EV1+ and EV1-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8

    A01WXA9E01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Revolution Signal from ECM to Inverter with Converter Assembly
    ECM Terminal Name Between G2O and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  9. WAVEFORM 9

    A01WXMUE02
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Crankshaft Position Sensor Signal
    ECM Terminal Name Between NE+ and NE-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  10. WAVEFORM 10

    A01WY4DE01
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Ignition Coil Assembly Signal (IGT and IGF Signal)
    ECM Terminal Name

    CH1: Between IGT (1 to 4) and E1

    CH2: Between IGF1 and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  11. WAVEFORM 11

    A01WYCZE01
    *1 10 V/DIV.
    *2 20 ms./DIV.
    Purge VSV Operation Signal
    ECM Terminal Name Between PRG and E01
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition 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.

  12. WAVEFORM 12

    A01WXH1E03
    *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.

  13. WAVEFORM 13

    A01WX9AE01
    *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.

  14. WAVEFORM 14

    A01WY0XE10
    *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 with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  15. WAVEFORM 15

    A01WYM5E03
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CANH and E1

    Between CAN+ and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  16. WAVEFORM 16

    A01WY44E03
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CANL and E1

    Between CAN- and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  17. WAVEFORM 17

    A01WXDVE01
    *1 20 V/DIV.
    *2 50 ms./DIV.
    EGR Valve Assembly Signal
    ECM Terminal Name

    Between EGR1 and E1

    Between EGR2 and E1

    Between EGR3 and E1

    Between EGR4 and E1
    Tester Range 20 V/DIV., 50 ms./DIV.
    Condition EGR valve operating

  18. WAVEFORM 18

    A01WYTAE04
    *a 2 V/DIV.
    *b 20 ms./DIV
    No. 1 (to No. 4) Fuel Injector Set (for Direct Injection) Signal
    ECM Terminal Name

    CH1: Between #1 and E1

    CH2: Between INJ1 and E1

    CH1: Between #2 and E1

    CH2: Between INJ2 and E1

    CH1: Between#3 and E1

    CH2: Between INJ2 and E1

    CH1: Between #4 and E1

    CH2: Between INJ1 and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine (direct injection control)

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • When the direct injection injectors are operating, Direct is displayed for Injection Way of the Data List.

  19. WAVEFORM 19

    A01WXI5E03
    *a 2 V/DIV.
    *b 5 ms./DIV.
    Fuel Pump (for High Pressure) (Spill Control Valve) Operation Signal
    ECM Terminal Name

    CH1: Between FPD and E1

    CH2: Between FPF and E1
    Tester Range 2 V/DIV., 5 ms./DIV.
    Condition Idling with warm engine

  20. WAVEFORM 20

    A01WXG6E08
    *a 1 V/DIV.
    *b 20 ms./DIV.
    Cooling Fan Control Signal
    ECM Terminal Name Between RFC and E1
    Tester Range 1 V/DIV., 20 ms./DIV.
    Condition Power switch on (IG), A/C switch on (max cool)

    Tech Tips

    The duty ratio varies depending on the engine coolant temperature.