СИСТЕМА SFI КОНТАКТЫ ECM

A01DZUCE05

Tech Tips

Each ECM terminal's normal voltage is shown in the table below.

In the table, first follow the information under "Condition". Look under "Symbols (Terminal No.)" for the terminals to be inspected. The standard voltage between the terminals is shown under "Specified Condition".

Use the illustration above as a reference for the ECM terminals.

Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
BATT (E14-3) - E1 (E17-1) L - BR Battery (for measuring battery voltage and for ECM memory) Always 9 to 14 V
+BM (E14-7) - E1 (E17-1) R-W - BR Power source of throttle motor Always 9 to 14 V
IGSW (E14-9) - E1 (E17-1) B-O - BR Ignition switch Ignition switch ON 9 to 14 V
+B (E14-1) - E1 (E17-1) B - BR Power source of ECM Ignition switch ON 9 to 14 V
+B2 (E14-2) - E1 (E17-1) B - BR Power source of ECM Ignition switch ON 9 to 14 V
OC1+ (E17-17) - OC1- (E17-16) L-B - R-B Camshaft timing oil control valve (OCV) Ignition switch ON

Pulse generation

(see waveform 1)
OC2+ (E17-15) - OC2- (E17-14) P-L - Y Camshaft timing oil control valve (OCV) Ignition switch ON

Pulse generation

(see waveform 1)
MREL (E14-8) - E1 (E17-1) W-G - BR MAIN relay Ignition switch ON 9 to 14 V
VC (E15-23) - E2 (E15-28) LG-B - BR Power source for sensors (specific voltage) Ignition switch ON 4.5 to 5.5 V
VG (E15-30) - E2G (E15-29) L-W - L-R Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
THA (E15-22) - E2 (E15-28) L-B - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
THW (E15-21) - E2 (E15-28) B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
VTA1 (E15-20) - E2 (E15-28) B-R - BR Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.2 V
VTA1 (E15-20) - E2 (E15-28) B-R - BR Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully open 3.2 to 4.8 V
VTA2 (E15-19) - E2 (E15-28) LG - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal released 2.1 to 3.1 V
VTA2 (E15-19) - E2 (E15-28) LG - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal depressed 4.5 to 5.0 V
VPA (E14-18) - EPA (E14-20) W-L - BR-W Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal released 0.5 to 1.1 V
VPA (E14-18) - EPA (E14-20) W-L - BR-W Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal depressed 2.6 to 4.5 V
VPA2 (E14-19) - EPA2 (E14-21) GR-G - BR-Y Accelerator pedal position sensor (for sensor malfunctioning detection) Ignition switch ON, Accelerator pedal released 1.2 to 2.0 V
VPA2 (E14-19) - EPA2 (E14-21) GR-G - BR-Y Accelerator pedal position sensor (for sensor malfunctioning detection) Ignition switch ON, Accelerator pedal depressed 3.4 to 5.0 V
VCPA (E14-26) - EPA (E14-20) LG-R - BR-W Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
VCP2 (E14-27) - EPA2 (E14-21) BR-R - BR-Y Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V

HA1A (E16-2) - E04 (E16-7)

HA2A (E16-1) - E05 (E16-6)

Y - W-B

R-L - W-B

 A/F sensor heater Idling

Pulse generation

(see waveform 2)

HA1A (E16-2) - E04 (E16-7)

HA2A (E16-1) - E05 (E16-6)

Y - W-B

R-L - W-B

 A/F sensor heater Ignition switch ON 9 to 14 V
A1A+ (E16-22) - E1 (E17-1) B - BR A/F sensor Ignition switch ON 3.3 V *
A2A+ (E16-23) - E1 (E17-1) G - BR A/F sensor Ignition switch ON 3.3 V *
A1A- (E16-30) - E1 (E17-1) W - BR A/F sensor Ignition switch ON 3.0 V *
A2A- (E16-31) - E1 (E17-1) R - BR A/F sensor Ignition switch ON 3.0 V *

HT1B (E15-1) - E1 (E17-1)

HT2B (E16-5) - E1 (E17-1)

G - BR

L - BR

 Heated oxygen sensor heater Idling Below 3.0 V

HT1B (E15-1) - E1 (E17-1)

HT2B (E16-5) - E1 (E17-1)

G - BR

L - BR

 Heated oxygen sensor heater Ignition switch ON 9 to 14 V

OX1B (E15-18) - E2 (E15-28)

OX2B (E16-33) - E2 (E15-28)

W - BR

B - BR

 Heated oxygen sensor Maintain engine speed at 2,500 rpm for 2 minutes after warming up

Pulse generation

(see waveform 3)

#10 (E17-2) - E01 (E15-7)

#20 (E17-3) - E01 (E15-7)

#30 (E17-4) - E01 (E15-7)

#40 (E17-5) - E01 (E15-7)

#50 (E17-6) - E01 (E15-7)

#60 (E17-7) - E01 (E15-7)

L - W-B

G - W-B

R - W-B

W - W-B

L - W-B

Y - W-B

 Injector Ignition switch ON 9 to 14 V

#10 (E17-2) - E01 (E15-7)

#20 (E17-3) - E01 (E15-7)

#30 (E17-4) - E01 (E15-7)

#40 (E17-5) - E01 (E15-7)

#50 (E17-6) - E01 (E15-7)

#60 (E17-7) - E01 (E15-7)

L - W-B

G - W-B

R - W-B

W - W-B

L - W-B

Y - W-B

 Injector Idling

Pulse generation

(see waveform 4)

IGT1 (E15-8) - E1 (E17-1)

IGT2 (E15-9) - E1 (E17-1)

IGT3 (E15-10) - E1 (E17-1)

IGT4 (E15-11) - E1 (E17-1)

IGT5 (E15-12) - E1 (E17-1)

IGT6 (E15-13) - E1 (E17-1)

R - BR

R-L - BR

G-B - BR

G - BR

B-L - BR

P-L - BR

 Ignition coil (ignition signal) Idling

Pulse generation

(see waveform 7)
KNK1 (E16-29) - EKNK (E16-28) B - W Knock sensor Maintain engine speed at 4,000 after warming up

Pulse generation

(see waveform 5)
KNK2 (E16-21) - EKN2 (E16-20) R - G Knock sensor Maintain engine speed at 4,000 after warming up

Pulse generation

(see waveform 5)
VV1+ (E17-19) - VV1- (E17-29) R - G Variable valve timing (VVT) sensor Idling

Pulse generation

(see waveform 6)
VV2+ (E17-18) - VV2- (E17-28) Y - L Variable valve timing (VVT) sensor Idling

Pulse generation

(see waveform 6)
NE+ (E17-21) - NE- (E17-20) B - W Crankshaft position sensor Idling

Pulse generation

(see waveform 6)
IGF1 (E15-24) - E1 (E17-1) G-R - BR

Ignition coil

(ignition confirmation signal)

 Ignition switch ON 4.5 to 5.5 V
IGF1 (E15-24) - E1 (E17-1) G-R - BR

Ignition coil

(ignition confirmation signal)

 Idling

Pulse generation

(see waveform 7)
PRG (E15-34) - E1 (E17-1) L - BR VSV for EVAP Ignition switch ON 9 to 14 V
PRG (E15-34) - E1 (E17-1) L - BR VSV for EVAP Idling

Pulse generation

(see waveform 8)
SPD (E13-8) - E1 (E17-1) V-R - BR Speed signal from combination meter Ignition switch ON, Rotate driving wheel slowly

Pulse generation

(see waveform 9)
STA (E17-11) - E1 (E17-1) B-Y - BR Starter signal Cranking 9 to 14 V
NSW (E16-8) - E1 (E17-1) L-Y - BR Park/Neutral position switch signal Ignition switch ON, Other shift position not in P or N 9 to 14 V
NSW (E16-8) - E1 (E17-1) L-Y - BR Park/Neutral position switch signal Ignition switch ON, Shift position in P or N 0 to 3.0 V
STP (E14-15) - E1 (E17-1) G-W - BR Stop light switch Brake pedal depressed 7.5 to 14 V
STP (E14-15) - E1 (E17-1) G-W - BR Stop light switch Brake pedal released Below 1.5 V
ST1- (E14-16) - E1 (E17-1) R-L - BR

Stop light switch

(ST1 terminal status is opposite to STP terminal)

 Ignition switch ON, Brake pedal depressed Below 1.5 V
ST1- (E14-16) - E1 (E17-1) R-L - BR

Stop light switch

(ST1 terminal status is opposite and STP terminal)

 Ignition switch ON, Brake pedal released 7.5 to 14 V
M+ (E15-5) - ME01 (E16-3) B - W-B Throttle actuator Idling with warm engine

Pulse generation

(see waveform 10)
M- (E15-4) - ME01 (E16-3) W - W-B Throttle actuator Idling with warm engine

Pulse generation

(see waveform 11)
FC (E14-10) - E1 (E17-1) LG-B - BR Fuel pump control Ignition switch ON 9 to 14 V
FPR (E17-30) - E1 (E17-1) P-L - BR Fuel pump control Ignition switch ON, STA signal OFF 0 to 3.0 V
FPR (E17-30) - E1 (E17-1) P-L - BR Fuel pump control Ignition switch ON, STA signal ON 9 to 14 V
W (E13-30) - E1 (E17-1) R-B - BR MIL Ignition switch ON Below 3.0 V
W (E13-30) - E1 (E17-1) R-B - BR MIL Idling 9 to 14 V
TC (E14-23) - E1 (E17-1) P-B - BR Terminal TC of DLC3 Ignition switch ON 9 to 14 V
SIL (E14-30) - E1 (E17-1) R-Y - BR Terminal SIL of DLC3 Connect intelligent tester to DLC3 Pulse generation
TACH (E13-1) - E1 (E17-1) B-W - BR Engine speed Idling

Pulse generation

(see waveform 12)
ACIS (E15-33) - E1 (E17-1) G-B - BR VSV for ACIS Ignition switch ON 9 to 14 V
PSW (E17-10) - E1 (E17-1) G-Y - BR Power steering pressure switch Ignition switch ON 9 to 14 V

Tech Tips

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


  1. WAVEFORM 1

    A01E17UE02

    • Camshaft timing Oil Control Valve (OCV)

    Item Content
    Symbols (Terminal No.)

    OC1+ (E17-17) - OC1- (E17-16)

    OC2+ (E17-15) - OC2- (E17-14)
    Tool Setting 5 V/DIV., 1 msec./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine rpm increases.

  2. WAVEFORM 2

    A01DZOKE01

    • A/F sensor heater

    Item Content
    Symbols (Terminal No.)

    HA1A (E16-2) - E04 (E16-7)

    HA2A (E16-1) - E05 (E16-6)
    Tool Setting 5 V/DIV., 10 msec./DIV.
    Condition Idling

  3. WAVEFORM 3

    A01E1HTE05

    • Heated oxygen sensor

    Item Content
    Symbols (Terminal No.)

    OX1B (E15-18) - E2 (E15-28)

    OX2B (E16-33) - E2 (E15-28)
    Tool Setting 0.2 V/DIV., 200 msec./DIV.
    Condition Engine speed maintained at 2,500 rpm for 2 minutes after warming up engine

    Tech Tips

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

  4. WAVEFORM 4

    A01E190E01

    • Fuel injector

    Item Content
    Symbols (Terminal No.)

    #10 (E17-2) - E01 (E15-7)

    #20 (E17-3) - E01 (E15-7)

    #30 (E17-4) - E01 (E15-7)

    #40 (E17-5) - E01 (E15-7)

    #50 (E17-6) - E01 (E15-7)

    #60 (E17-7) - E01 (E15-7)
    Tool Setting 30 V/DIV., 20 msec./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine rpm increases.

  5. WAVEFORM 5

    A01DV5IE03

    • Knock sensor

    Item Content
    Symbols (Terminal No.)

    KNK1 (E16-29) - EKNK (E16-28)

    KNK2 (E16-21) - EKN2 (E16-20)
    Tool Setting 0.01 to 10 V/DIV., 0.01 to 10 msec./DIV.
    Condition Maintain engine speed at 4,000 rpm after warming up engine

    Tech Tips


    • The wavelength becomes shorter as the engine rpm increases.

    • The waveform and amplitude displayed differ slightly depending on the vehicle.

  6. WAVEFORM 6

    A01DY9WE01

    • (a) Crankshaft position sensor

    • (b) VVT sensor bank 1

    • (c) VVT sensor bank 2

    Item Content
    Symbols (Terminal No.)

    NE+ (E17-21) - NE- (E17-20)

    VV1+ (E17-19) - VV1- (E17-29)

    VV2+ (E17-18) - VV2- (E17-28)
    Tool Setting 5 V/DIV., 20 msec./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine rpm increases.

  7. WAVEFORM 7

    A01E2TWE01

    • (a) Igniter IGT signal (from ECM to igniter)

    • (b) Igniter IGF signal (from igniter to ECM)

    Item Content
    Symbols (Terminal No.)

    IGT1 (E15-8) - E1 (E17-1)

    IGT2 (E15-9) - E1 (E17-1)

    IGT3 (E15-10) - E1 (E17-1)

    IGT4 (E15-11) - E1 (E17-1)

    IGT5 (E15-12) - E1 (E17-1)

    IGT6 (E15-13) - E1 (E17-1)

    IGF1 (E15-24) - E1 (E17-1)
    Tool Setting 2 V/DIV., 20 msec./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine rpm increases.

  8. WAVEFORM 8

    A01E23ME02

    • VSV for EVAP

    Item Content
    Symbols (Terminal No.) PRG (E15-34) - E1 (E17-1)
    Tool Setting 10 V/DIV., 20 msec./DIV.
    Condition Idling

    Tech Tips

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

  9. WAVEFORM 9

    A01E1K1E08

    • Vehicle speed signal

    Item Content
    Symbols (Terminal No.) SPD (E13-8) - E1 (E17-1)
    Tool Setting 2 V/DIV., 20 msec./DIV.
    Condition Driving at 20 mph (12 km/h)

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  10. WAVEFORM 10

    A01DYXGE06

    • Throttle actuator positive terminal

    Item Content
    Symbols (Terminal No.) M+ (E15-5) - ME01 (E16-3)
    Tool Setting 5 V/DIV., 1 msec./DIV.
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  11. WAVEFORM 11

    A01DYF2E04

    • Throttle actuator negative terminal

    Item Content
    Symbols (Terminal No.) M- (E15-4) - ME01 (E16-3)
    Tool Setting 5 V/DIV., 1 msec./DIV.
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  12. WAVEFORM 12

    A01E2H2E01

    • Engine speed signal

    Item Content
    Symbols (Terminal No.) TACH (E13-1) - E1 (E17-1)
    Tool Setting 5 V/DIV., 10 msec./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine rpm increases.