SFI SYSTEM TERMINALS OF ECM

A01W4OUE02

Tech Tips

The standard voltage, resistance and waveform between each pair of 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
A75-1 (BATT) - D87-53 (E1) GR - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A75-2 (+B) - D87-53 (E1) P - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
A75-3 (+B2) - D87-53 (E1) LG - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
A75-4 (FANH) - D87-51 (E01) W - W-B Cooling fan motor (high) operation signal Engine switch on (IG) 11 to 14 V
Idling with high engine coolant temperature Below 1.5 V
A75-6 (IGSW) - D87-53 (E1) V - W-B Ignition switch signal Engine switch on (IG) 11 to 14 V
A75-8 (IREL) - D87-53 (E1) L - W-B EDU relay operation signal Engine stopped, engine switch on (IG) 0 to 1.5 V
A75-9 (STP) - D87-53 (E1) BE - W-B Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A75-10 (ST1-) - D87-53 (E1) GR - W-B Stop light switch assembly signal (opposite to STP terminal) Engine switch on (IG), brake pedal depressed Below 1.5 V
Engine switch on (IG), brake pedal released 7.5 to 14 V
A75-13 (CANH) - D87-53 (E1) B - W-B CAN communication signal Engine switch on (IG)

Pulse generation

(see waveform 1)
A75-14 (EC) - Body ground W-B - - Ground Always Below 1 Ω
A75-17 (FANL) - D87-51 (E01) R - W-B Cooling fan motor (low) operation signal Engine switch on (IG) 11 to 14 V
Idling with A/C on, or high engine coolant temperature Below 1.5 V
A75-21 (FPC) - D87-53 (E1) W - W-B Fuel pump control Engine stopped, engine switch on (IG) Below 1.5 V
A75-26 (CANL) - D87-53 (E1) W - W-B CAN communication signal Engine switch on (IG)

Pulse generation

(see waveform 2)
A75-27 (W) - D87-53 (E1) R - W-B Malfunction Indicator Lamp (MIL) operation signal

Engine switch on (IG)

(MIL illuminated)

 Below 3.0 V
Idling 11 to 14 V
A75-29 (STA) - D87-53 (E1) LG - W-B Starter signal Cranking 6.0 V or higher
A75-30 (NEO) - D87-53 (E1) G - W-B Engine speed signal sent to other ECUs Idling with warm engine

Pulse generation

(see waveform 3)
A75-31 (TACH) - D87-53 (E1) B - W-B Engine speed signal Idling with warm engine

Pulse generation

(see waveform 4)
A75-33 (TC) - D87-53 (E1) P - W-B Terminal TC of DLC3 Engine stopped, engine switch on (IG) 11 to 14 V
A75-36 (PWMS) - D87-53 (E1) L - W-B Drive mode switch signal (SPORT mode) Engine switch on (IG) 11 to 14 V
Engine switch on (IG), SPORT mode switch being turned and held at SPORT position (SPORT mode) 0 to 1.5 V
A75-39 (SPCN) - D87-53 (E1) B - W-B Drive mode switch signal (NORMAL mode) Engine switch on (IG) 11 to 14 V
Engine switch on (IG), NORMAL mode switch being pushed and held (NORMAL mode) 0 to 1.5 V
A75-44 (SPD) - D87-53 (E1) L - W-B Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

Pulse generation

(see waveform 5)
A75-46 (MREL) - D87-53 (E1) BE - W-B EFI MAIN relay operation signal Engine switch on (IG) 11 to 14 V
A75-47 (VPA) - A75-48 (EPA) G - Y Accelerator pedal position sensor signal (for engine control) Engine switch on (IG), accelerator pedal fully released 0.5 to 1.1 V
Engine switch on (IG), accelerator pedal fully depressed 2.6 to 4.5 V
A75-49 (VCPA) - A75-48 (EPA) P - Y Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V
A75-50 (VPA2) - A75-51 (EPA2) R - BE Accelerator pedal position sensor signal Engine switch on (IG), accelerator pedal fully released 1.2 to 2.0 V
Engine switch on (IG), accelerator pedal fully depressed 3.4 to 4.75 V
A75-52 (VCP2) - A75-51 (EPA2) L - BE Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V
A75-57 (NSW) - D87-53 (E1) LG - W-B Park/Neutral position switch assembly signal Engine switch on (IG) and shift lever in P or N Below 3.0 V
A75-58 (KSW) - D87-53 (E1) R - W-B Key in vehicle signal Engine switch off → on (IG) 0 to 3.0 V
A75-59 (S) - D87-53 (E1) Y - W-B S shift position signal Engine switch on (IG), shift lever in S 11 to 14 V
Engine switch on (IG), shift lever not in S Below 1 V
D87-9 (OC1+) - D87-8 (OC1-) W - B Cam timing oil control solenoid assembly operation signal Idling

Pulse generation

(See waveform 6)
D87-16 (M+) - D87-49 (ME01) W - W-B

Throttle actuator operation signal

(positive terminal)

 Idling with warm engine

Pulse generation

(See waveform 7)
D87-17 (HT1B) - D87-53 (E1) Y - W-B Heated oxygen sensor (sensor 2) heater operation signal Engine switch on (IG) 11 to 14 V
Idling Below 3.0 V
D87-18 (E04) - Body ground W-B - - Ground Always Below 1 Ω
D87-19 (HA1A) - D87-18 (E04) G - W-B Air fuel ratio sensor (sensor 1) heater operation signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(See waveform 8)
D87-21 (#2D+) - D87-20 (#2D-) BR - G No. 2 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct" Pulse generation
D87-22 (#3D+) - D87-23 (#3D-) L - Y No. 3 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct" Pulse generation
D87-25 (#4D+) - D87-24 (#4D-) P - V No. 4 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct" Pulse generation
D87-26 (#1D+) - D87-27 (#1D-) B - W No. 1 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct" Pulse generation
D87-28 (FP1+) - D87-29 (FP1-) BR - G Fuel pump (for high pressure side) signal Engine running (direct injection control) Pulse generation
D87-30 (+BD1) - D87-53 (E1) L - W-B

Power source of ECU

(injector driver)

 Engine stopped, engine switch on (IG) 11 to 14 V
D87-32 (EGR4) - D87-53 (E1) B - W-B EGR valve assembly EGR valve operating

Pulse generation

(See waveform 9)
D87-33 (EGR2) - D87-53 (E1) W - W-B EGR valve assembly EGR valve operating

Pulse generation

(See waveform 9)
D87-34 (D) - D87-53 (E1) G - W-B D shift position signal Engine switch on (IG), shift lever in D or S 11 to 14 V
Engine switch on (IG), shift lever not in D or S Below 1 V
D87-35 (R) - D87-53 (E1) GR - W-B R shift position signal Engine switch on (IG), shift lever in R 11 to 14 V
Engine switch on (IG), shift lever not in R Below 1 V
D87-36 (EGR1) - D87-53 (E1) Y - W-B EGR valve assembly EGR valve operating

Pulse generation

(See waveform 9)
D87-37 (EGR3) - D87-53 (E1) R - W-B EGR valve assembly EGR valve operating

Pulse generation

(See waveform 9)
D87-38 (OE1+) - D87-68 (OE1-) R - GR Camshaft timing oil control valve assembly operation signal Idling

Pulse generation

(See waveform 10)
D87-39 (IGT4) - D87-53 (E1) L - W-B No. 4 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(See waveform 11)
D87-40 (IGT3) - D87-53 (E1) G - W-B No. 3 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(See waveform 11)
D87-41 (IGT2) - D87-53 (E1) P - W-B No. 2 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(See waveform 11)
D87-42 (IGT1) - D87-53 (E1) Y - W-B No. 1 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(See waveform 11)
D87-46 (M-) - D87-49 (ME01) B - W-B Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(see waveform 12)
D87-47 (GE01) - Body ground G - - Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
D87-48 (+BM) - D87-53 (E1) R - W-B Power source of throttle actuator Always 11 to 14 V
D87-49 (ME01) - Body ground W-B - - Ground Always Below 1 Ω
D87-50 (E02) - Body ground W-B - - Ground Always Below 1 Ω
D87-51 (E01) - Body ground W-B - - Ground Always Below 1 Ω
D87-53 (E1) - Body ground W-B - - Ground Always Below 1 Ω
D87-54 (#20) - D87-53 (E1) R - W-B No. 2 fuel injector assembly (for port injection) signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(see waveform 13)
D87-55 (#30) - D87-53 (E1) Y - W-B No. 3 fuel injector assembly (for port injection) signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(see waveform 13)
D87-56 (#40) - D87-53 (E1) G - W-B No. 4 fuel injector assembly (for port injection) signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(see waveform 13)
D87-57 (#10) - D87-53 (E1) R - W-B No. 1 fuel injector assembly (for port injection) signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(see waveform 13)
D87-58 (E1D2) - Body ground W - - Ground Always Below 1 Ω
D87-59 (E1D1) - Body ground B - - Ground Always Below 1 Ω
D87-60 (+BD2) - D87-53 (E1) Y - W-B EDU relay signal Engine stopped, engine switch on (IG) 11 to 14 V
D87-64 (P) - D87-53 (E1) B - W-B P shift position signal Engine switch on (IG), shift lever in P 11 to 14 V
Engine switch on (IG), shift lever not in P Below 1 V
D87-65 (N) - D87-53 (E1) L - W-B N shift position signal Engine switch on (IG), shift lever in N 11 to 14 V
Engine switch on (IG), shift lever not in N Below 1 V
D87-70 (PRG) - D87-53 (E1) W - W-B Purge VSV for EVAP system operation signal Engine switch on (IG) 11 to 14 V
Idling with warm engine, under purge control

Pulse generation

(see waveform 14)
D87-76 (NE+) - D87-109 (NE-) B - R Crankshaft position sensor signal Idling with warm engine

Pulse generation

(see waveform 15)
D87-81 (EV1+) - D87-112 (EV1-) P - W Camshaft position sensor (for exhaust camshaft) signal Idling with warm engine

Pulse generation

(see waveform 16)
D87-82 (VV1+) - D87-114 (VV1-) V - L Camshaft position sensor (for intake camshaft) signal Idling with warm engine

Pulse generation

(see waveform 16)
D87-88 (VTA2) - D87-120 (ETA) W - R Throttle position sensor signal (for sensor malfunction detection) Engine switch on (IG), accelerator pedal fully released 2.1 to 3.1 V
Engine running, accelerator pedal fully depressed 4.6 to 5.0 V
D87-90 (VCVG) - D87-91 (E2G) Y - LG Power source of mass air flow meter sub-assembly Engine switch on (IG) 4.8 to 5.2 V
D87-92 (VG) - D87-91 (E2G) G - LG Mass air flow meter sub-assembly signal Engine switch on (IG)

Pulse generation

(See waveform 17)
D87-94 (THA) - D87-91 (E2G) P - LG Intake air temperature sensor signal Idling, intake air temperature 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
D87-97 (THEO) - D87-96 (ETHE) LG - P Engine oil temperature sensor signal Idling with warm engine 0 to 5.0 V
D87-98 (PEO) - D87-129 (EPEO) G - W Oil pressure sender gauge assembly signal Idling with warm engine 0.5 to 4.5 V
D87-99 (OX1B) - D87-100 (EX1B) W - R Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 18)
D87-101 (IGF1) - D87-53 (E1) W - W-B Ignition coil assembly (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V
Idling with warm engine

Pulse generation

(See waveform 11)
D87-103 (PR) - D87-135 (EPR) B - Y Fuel pressure sensor signal Idling with warm engine 0.5 to 4.5 V
D87-104 (THW) - D87-105 (ETHW) W - P Engine coolant temperature sensor signal Idling, engine coolant temperature 75 to 100°C (167 to 212°F) 0.2 to 1.0 V
D87-106 (PIM) - D87-137 (EPIM) Y - B Manifold absolute pressure sensor signal Engine switch on (IG) 3.0 to 5.25 V
D87-110 (VCNE) - D87-53 (E1) W - W-B Power source of crankshaft position sensor Engine switch on (IG) 4.5 to 5.5 V
D87-111 (VCE1) - D87-53 (E1) LG - W-B Power source of camshaft position sensor (for exhaust camshaft) Engine switch on (IG) 4.5 to 5.5 V
D87-113 (VCV1) - D87-53 (E1) B - W-B Power source of camshaft position sensor (for intake camshaft) Engine switch on (IG) 4.5 to 5.5 V
D87-121 (VCTA) - D87-120 (ETA) B - R Power source of throttle position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
D87-122 (VTA1) - D87-120 (ETA) Y - R Throttle position sensor signal (for engine control) Engine switch on (IG), accelerator pedal fully released 0.6 to 1.1 V
Engine runnin, accelerator pedal fully depressed 3.2 to 4.8 V
D87-124 (KNK1) - D87-123 (EKNK) W - B Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 19)
D87-130 (VCPE) - D87-53 (E1) Y - W-B Power source of engine oil sender gauge assembly Engine switch on (IG) 4.75 to 5.25 V
D87-131 (A1A+) - D87-53 (E1) L - W-B Air fuel ratio sensor signal Engine switch on (IG) 3.0 to 3.6 V*
D87-132 (A1A-) - D87-53 (E1) P - W-B Air fuel ratio sensor signal Engine switch on (IG) 2.7 to 3.3 V*
D87-136 (VCPR) - D87-53 (E1) L - W-B Power source of fuel pressure sensor Engine switch on (IG) 4.75 to 5.25 V
D87-138 (VCPM) - D87-53 (E1) W - W-B Power source of manifold absolute pressure sensor Engine switch on (IG) 4.75 to 5.25 V

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


  1. WAVEFORM 1

    A01W4ZOE12
    *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 Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  2. WAVEFORM 2

    A01W2UHE15
    *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 Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  3. WAVEFORM 3

    A01W22EE15
    *a 1 V/DIV.
    *b 2 ms./DIV.
    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

    A01W242E02
    *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.

  5. WAVEFORM 5

    A01W5JZE07
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Vehicle Speed Signal
    ECM Terminal Name Between SPD and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Driving at 20 km/h (12 mph)

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  6. WAVEFORM 6

    A01W0Z3E05
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Cam Timing Oil Control Solenoid Assembly Operation Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  7. WAVEFORM 7

    A01W1A5E62
    *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.

  8. WAVEFORM 8

    A01W278E22
    *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

  9. WAVEFORM 9

    A01VZD3E08
    *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

  10. WAVEFORM 10

    A01W0Z3E05
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly Operation Signal
    ECM Terminal Name Between OE1+ and OE1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  11. WAVEFORM 11

    A01W2LCE11
    *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.

  12. WAVEFORM 12

    A01W1HCE56
    *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.

  13. WAVEFORM 13

    A01W2QJE03
    *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 E1
    Tester Range 20 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine, Data List item "Injection Mode" displaying "Port"

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

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

  14. WAVEFORM 14

    A01W10LE26
    *1 10 V/DIV.
    *2 20 ms./DIV.
    Purge VSV Operation Signal
    ECM Terminal Name Between PRG and E1
    Tester Range 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.

  15. WAVEFORM 15

    A01W276E21
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Crankshaft Position Sensor Signal
    ECM Terminal Name Between NE+ and NE-
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  16. WAVEFORM 16

    A01W1VOE33
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Position Sensor Signal (for Intake and Exhaust Camshaft)
    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.

  17. WAVEFORM 17

    A01W4CME08
    *a 1 V/DIV.
    *b 100 μs./DIV.
    Mass Air Flow Meter Sub-assembly Signal
    ECM Terminal Name Between VG and E2G
    Tester Range 1 V/DIV., 100 μs./DIV.
    Condition Engine switch on (IG)

  18. WAVEFORM 18

    A01W2SKE04
    *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 O2 Sensor Voltage B1S2 shows the values input to the ECM from the heated oxygen sensor.

  19. WAVEFORM 19

    A01W38IE20
    *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 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.