SFI SYSTEM TERMINALS OF ECM

B0087BKN01

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
A78-1 (BATT) - C58-53 (E1) R - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A78-2 (+B) - C58-53 (E1) L - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
A78-3 (+B2) - C58-53 (E1) L - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
A78-6 (IGSW) - C58-53 (E1) B - W-B Engine switch signal Engine switch on (IG) 11 to 14 V
A78-8 (IREL) - C58-53 (E1) P - W-B D INJ relay operation signal Engine switch on (IG) Below 1.5 V
A78-9 (STP) - C58-53 (E1) SB - W-B Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A78-10 (ST1-) - C58-53 (E1) LG - 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
A78-13 (CANH) - C58-53 (E1) B - W-B CAN communication signal Engine switch on (IG)

Pulse generation

(see waveform 1)
A78-14 (EC) - Body ground W-B - - Ground Always Below 1 Ω
A78-21 (FPC) - C58-53 (E1) R - W-B Fuel pump control Engine switch on (IG) Below 1.5 V
A78-26 (CANL) - C58-53 (E1) W - W-B CAN communication signal Engine switch on (IG)

Pulse generation

(see waveform 2)
A78-29 (STA) - C58-53 (E1) G - W-B Starter assembly signal Cranking 6.0 V or higher
A78-30 (NEO) - C58-53 (E1) B - W-B Engine speed signal sent to other ECUs Idling with warm engine

Pulse generation

(see waveform 3)
A78-31 (TACH) - C58-53 (E1) P - W-B Engine speed signal Idling with warm engine

Pulse generation

(see waveform 4)
A78-33 (TC) - C58-53 (E1) GR - W-B Terminal TC of DLC3 Engine switch on (IG) 11 to 14 V
A78-44 (SPD) - C58-53 (E1) L - W-B Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

Pulse generation

(see waveform 5)
A78-46 (MREL) - C58-53 (E1) W - W-B EFI-MAIN NO. 1 relay operation signal Engine switch on (IG) 11 to 14 V
A78-47 (VPA) - A78-48 (EPA) G - L 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
A78-49 (VCPA) - A78-48 (EPA) BE - L Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V
A78-50 (VPA2) - A78-51 (EPA2) GR - P 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
A78-52 (VCP2) - A78-51 (EPA2) SB - P Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V
A78-57 (NSW) - C58-53 (E1) BE - W-B Park/Neutral position switch assembly signal Engine switch on (IG) and shift lever not in P or N 11 to 14 V
Engine switch on (IG) and shift lever in P or N Below 3.0 V
A78-58 (KSW) - C58-53 (E1) R - W-B Electrical key in vehicle signal Electrical key outside vehicle 11 to 14 V
A78-59 (S) - C58-53 (E1) GR - 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 1.5 V
A78-60 (RFC) - C58-53 (E1) LG - W-B Cooling fan control signal Engine switch on (IG), A/C switch on (max cool)

Pulse generation

(See waveform 6)
C58-9 (OC1+) - C58-8 (OC1-) LG - BE Cam timing oil control solenoid assembly operation signal Idling

Pulse generation

(See waveform 7)
C58-16 (M+) - C58-49 (ME01) B - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See waveform 8)
C58-17 (HT1B) - C58-53 (E1) L - W-B Heated oxygen sensor heater operation signal Engine switch on (IG) 11 to 14 V
Idling with cold engine Below 3.0 V
C58-18 (E04) - Body ground W-B - - Ground Always Below 1 Ω
C58-19 (HA1A) - C58-18 (E04) R - W-B Air fuel ratio sensor heater operation signal Engine switch on (IG) 11 to 14 V
Idling with cold engine

Pulse generation

(See waveform 9)
C58-21 (#2D+) - C58-20 (#2D-) W - B No. 2 direct fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 10)
C58-22 (#3D+) - C58-23 (#3D-) P - V No. 3 direct fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 10)
C58-25 (#4D+) - C58-24 (#4D-) Y - L No. 4 direct fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 10)
C58-26 (#1D+) - C58-27 (#1D-) BR - G No. 1 direct fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 10)
C58-28 (FP1+) - C58-53 (E1) W - W-B Fuel pump with seal assembly (for high pressure side) signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)
C58-29 (FP1-) - C58-53 (E1) B - W-B Fuel pump with seal assembly (for high pressure side) signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)
C58-30 (+BD1) - C58-53 (E1) W - W-B Power source of ECU (injector driver) Engine switch on (IG) 11 to 14 V
C58-32 (EGR4) - C58-53 (E1) V - W-B EGR valve assembly EGR valve operating

Pulse generation

(See waveform 12)
C58-33 (EGR2) - C58-53 (E1) GR - W-B EGR valve assembly EGR valve operating

Pulse generation

(See waveform 12)
C58-34 (D) - C58-53 (E1) R - 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
C58-35 (R) - C58-53 (E1) W - 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
C58-36 (EGR1) - C58-53 (E1) BE - W-B EGR valve assembly EGR valve operating

Pulse generation

(See waveform 12)
C58-37 (EGR3) - C58-53 (E1) L - W-B EGR valve assembly EGR valve operating

Pulse generation

(See waveform 12)
C58-38 (OE1+) - C58-68 (OE1-) R - V Camshaft timing oil control valve assembly operation signal Idling

Pulse generation

(see waveform 13)
C58-39 (IGT4) - C58-53 (E1) B - W-B No. 4 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(see waveform 14)
C58-40 (IGT3) - C58-53 (E1) P - W-B No. 3 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(see waveform 14)
C58-41 (IGT2) - C58-53 (E1) R - W-B No. 2 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(see waveform 14)
C58-42 (IGT1) - C58-53 (E1) W - W-B No. 1 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(see waveform 14)
C58-46 (M-) - C58-49 (ME01) W - W-B Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(see waveform 15)
C58-47 (GE01) - Body ground BR - - Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
C58-48 (+BM) - C58-53 (E1) G - W-B Power source of throttle actuator Always 11 to 14 V
C58-49 (ME01) - Body ground W-B - - Ground Always Below 1 Ω
C58-50 (E02) - Body ground W-B - - Ground Always Below 1 Ω
C58-51 (E01) - Body ground W-B - - Ground Always Below 1 Ω
C58-53 (E1) - Body ground W-B - - Ground Always Below 1 Ω
C58-54 (#20) - C58-53 (E1) G - W-B No. 2 port fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(see waveform 16)
C58-55 (#30) - C58-53 (E1) LG - W-B No. 3 port fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(see waveform 16)
C58-56 (#40) - C58-53 (E1) BE - W-B No. 4 port fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(see waveform 16)
C58-57 (#10) - C58-53 (E1) B - W-B No. 1 port fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(see waveform 16)
C58-58 (E1D2) - Body ground W-B - - Ground Always Below 1 Ω
C58-59 (E1D1) - Body ground W-B - - Ground Always Below 1 Ω
C58-60 (+BD2) - C58-53 (E1) B - W-B D INJ relay signal Engine switch on (IG) 11 to 14 V
C58-64 (P) - C58-53 (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
C58-65 (N) - C58-53 (E1) LG - 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
C58-70 (PRG) - C58-53 (E1) W - W-B Purge VSV operation signal Engine switch on (IG) 11 to 14 V
Idling with warm engine, under purge control

Pulse generation

(see waveform 17)
C58-76 (NE+) - C58-109 (NE-) L - R Crank position sensor signal Idling with warm engine

Pulse generation

(see waveform 18)
C58-81 (EV1+) - C58-112 (EV1-) LG - W Camshaft position sensor (for exhaust camshaft) signal Idling with warm engine

Pulse generation

(see waveform 19)
C58-82 (VV1+) - C58-114 (VV1-) B - R Camshaft position sensor (for intake camshaft) signal Idling with warm engine

Pulse generation

(see waveform 19)
C58-88 (VTA2) - C58-120 (ETA) W - G Throttle position sensor signal (for sensor malfunction detection) Engine switch on (IG), accelerator pedal fully released 2.1 to 3.1 V
Accelerator pedal fully depressed (engine running) 4.6 to 5.0 V
C58-90 (VCVG) - C58-91 (E2G) LG - B Power source of mass air flow meter sub-assembly Engine switch on (IG) 4.8 to 5.2 V
C58-92 (VG) - C58-91 (E2G) BE - B Mass air flow meter sub-assembly signal Engine switch on (IG)

Pulse generation

(See waveform 20)
C58-94 (THA) - C58-91 (E2G) G - B Intake air temperature sensor signal Idling, intake air temperature 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
C58-97 (THEO) - C58-96 (ETHE) LG - BE Engine oil temperature sensor signal Idling with warm engine 0 to 5.0 V
C58-98 (PEO) - C58-129 (EPEO) G - W Oil pressure sender gauge assembly signal Idling with warm engine 0.5 to 4.5 V
C58-99 (OX1B) - C58-100 (EX1B) B - W Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 21)
C58-101 (IGF1) - C58-53 (E1) G - 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 14)
C58-103 (PR) - C58-135 (EPR) P - G Fuel pressure sensor (fuel delivery pipe sub-assembly) signal Idling with warm engine 0.5 to 4.5 V
C58-104 (THW) - C58-105 (ETHW) B - W Engine coolant temperature sensor signal Idling, engine coolant temperature 75 to 100°C (167 to 212°F) 0.2 to 1.0 V
C58-106 (PIM) - C58-137 (EPIM) P - G Manifold absolute pressure sensor signal Engine switch on (IG) 3.0 to 4.5 V
C58-110 (VCNE) - C58-53 (E1) V - W-B Power source of crank position sensor Engine switch on (IG) 4.5 to 5.5 V
C58-111 (VCE1) - C58-53 (E1) B - W-B Power source of camshaft position sensor (for exhaust camshaft) Engine switch on (IG) 4.5 to 5.5 V
C58-113 (VCV1) - C58-53 (E1) W - W-B Power source of camshaft position sensor (for intake camshaft) Engine switch on (IG) 4.5 to 5.5 V
C58-121 (VCTA) - C58-120 (ETA) R - G Power source of throttle position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
C58-122 (VTA1) - C58-120 (ETA) B - G Throttle position sensor signal (for engine control) Engine switch on (IG), accelerator pedal fully released 0.6 to 1.1 V
Accelerator pedal fully depressed (engine running) 3.2 to 4.8 V
C58-124 (KNK1) - C58-123 (EKNK) B - W Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 22)
C58-130 (VCPE) - C58-129 (EPEO) V - W Power source of engine oil sender gauge assembly Engine switch on (IG) 4.75 to 5.25 V
C58-131 (A1A+) - C58-53 (E1) L - W-B Air fuel ratio sensor signal Engine switch on (IG) 3.0 to 3.6 V*
C58-132 (A1A-) - C58-53 (E1) P - W-B Air fuel ratio sensor signal Engine switch on (IG) 2.7 to 3.3 V*
C58-136 (VCPR) - C58-135 (EPR) B - G Power source of fuel pressure sensor (fuel delivery pipe sub-assembly) (for high pressure side) signal Engine switch on (IG) 4.75 to 5.25 V
C58-138 (VCPM) - C58-137 (EPIM) B - G Power source of manifold absolute pressure sensor Engine switch on (IG) 4.75 to 5.25 V


  1. WAVEFORM 1

    B0084FVE01
    *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

    B0083VME02
    *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

    B00860IE02
    *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

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    B0087FSE02
    *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

    B0085YWE04
    *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

    B00889OE08
    *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 Engine switch on (IG), A/C switch on (max cool)

  7. WAVEFORM 7

    B0086L8E01
    *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

  8. WAVEFORM 8

    B008754E03
    *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.

  9. WAVEFORM 9

    B0085E3E06
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Air Fuel Ratio Sensor Heater Operation Signal
    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling with cold engine

  10. WAVEFORM 10

    B0089A1E01
    *1 50 V/DIV.
    *2 200 μs./DIV.
    No. 1 (to No. 4) Direct Fuel Injector Assembly Signal
    ECM Terminal Name

    CH1: Between #1D+ and E1

    CH2: Between #1D- and E1

    CH1: Between #2D+ and E1

    CH2: Between #2D- and E1

    CH1: Between #3D+ and E1

    CH2: Between #3D- and E1

    CH1: Between #4D+ and E1

    CH2: Between #4D- and E1
    Tester Range 50 V/DIV., 200 μs./DIV.
    Condition Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

  11. WAVEFORM 11

    B0085O9E05
    *1 20 V/DIV.
    *2 500 μs./DIV.
    Fuel Pump with Seal Assembly (for High Pressure Side) Signal
    ECM Terminal Name

    CH1: Between FP1+ and E1

    CH2: Between FP1- and E1
    Tester Range 20 V/DIV., 500 μs./DIV.
    Condition Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

  12. WAVEFORM 12

    B0083NVE01
    *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

  13. WAVEFORM 13

    B0086L8E01
    *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

  14. WAVEFORM 14

    B0087HAE01
    *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.

  15. WAVEFORM 15

    B0088XDE01
    *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.

  16. WAVEFORM 16

    B0087ZFE01
    *1 20 V/DIV.
    *2 20 ms./DIV.
    No. 1 (to No. 4) Port Fuel Injector Assembly 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.

  17. WAVEFORM 17

    B0085YHE09
    *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.

  18. WAVEFORM 18

    B00864SE09
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Crank 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.

  19. WAVEFORM 19

    B0083M7E16
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Position Sensor (for 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.

  20. WAVEFORM 20

    B00886JE01
    *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)

  21. WAVEFORM 21

    B0085NQE01
    *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.

  22. WAVEFORM 22

    B00859TE06
    *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.