GSIC - Global Service Information Center

# SFI SYSTEM > TERMINALS OF ECM

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HINT:

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

  In the table, first check 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 (E9-3) - E1 (E12-3) | L - BR | Battery (for measuring battery voltage and for ECM memory) | Always | 9 to 14 V
+BM (E9-7) - E1 (E12-3) | R-W - BR | Power source of throttle motor | Always | 9 to 14 V
IGSW (E9-9) - E1 (E12-3) | B-O - BR | Ignition switch | Ignition switch ON | 9 to 14 V
+B (E9-1) - E1 (E12-3) | B - BR | Power source of ECM | Ignition switch ON | 9 to 14 V
MREL (E9-8) - E1 (E12-3) | W-G - BR | EFI relay | Ignition switch ON | 9 to 14 V
VC (E12-18) - E2 (E12-28) | LG-B - BR | Power source of sensor (specific voltage) | Ignition switch ON | 4.5 to 5.5 V
VTA1 (E12-20) - E2 (E12-28) | B-R - BR | Throttle position sensor (for engine control) | Ignition switch ON, accelerator pedal fully released | 0.5 to 1.1 V
VTA1 (E12-20) - E2 (E12-28) | B-R - BR | Throttle position sensor (for engine control) | Ignition switch ON, accelerator pedal fully depressed | 3.2 to 4.8
VTA2 (E12-19) - E2 (E12-28) | LG - BR | Throttle position sensor (for sensor malfunction detection) | Ignition switch ON, accelerator pedal fully released | 2.1 to 3.1
VTA2 (E12-19) - E2 (E12-28) | LG - BR | Throttle position sensor (for sensor malfunction detection) | Ignition switch ON, accelerator pedal fully depressed | 4.5 to 5.5
VPA (E9-18) - EPA (E9- 20) | W-L - BR-W | Accelerator pedal position sensor (for engine control) | Ignition switch ON, accelerator pedal fully released | 0.5 to 1.1 V
VPA (E9-18) - EPA (E9- 20) | W-L - BR-W | Accelerator pedal position sensor (for engine control) | Ignition switch ON, accelerator pedal fully depressed | 2.5 to 4.6 V
VPA2 (E9-19) - EPA2 (E9-21) | GR-G - BR-Y | Accelerator pedal position sensor (for sensor malfunction detection) | Ignition switch ON, accelerator pedal fully released | 1.5 to 2.9 V
VPA2 (E9-19) - EPA2 (E9-21) | GR-G - BR-Y | Accelerator pedal position sensor (for sensor malfunction detection) | Ignition switch ON, accelerator pedal fully depressed | 3.5 to 5.5 V
VCPA (E9-26) - EPA (E9-20) | LG-R - BR-W | Power source of accelerator pedal position sensor (for VPA) | Ignition switch ON | 4.5 to 5.5 V
VCP2 (E9-27) - EPA2 (E9-21) | BR-R - BR-Y | Power source of accelerator pedal position sensor (for VPA2) | Ignition switch ON | 4.5 to 5.5 V
VG (E11-28) - E2G (E11-30) | L-W - L-R | MAF meter | Idling, shift position on P or N, A/C switch off | 0.5 to 3.0 V
THA (E11-29) - E2 (E12-28) | L-B - BR | IAT sensor | Idling, intake air temperature 20°C (68°F) | 0.5 to 3.4 V
THW (E12-32) - E2 (E12-28) | B - BR | ECT sensor | Idling, engine coolant temperature 80°C (176°F) | 0.2 to 1.0 V
#10 (E11-6) - E01 (E12-7) #20 (E11-5) - E01 (E12-7) #30 (E11-2) - E01 (E12-7) #40 (E11-1) - E01 (E12-7) | L - W-B G - W-B R - W-B W - W-B | Injector | Ignition switch ON | 9 to 14 V
#10 (E11-6) - E01 (E12-7) #20 (E11-5) - E01 (E12-7) #30 (E11-2) - E01 (E12-7) #40 (E11-1) - E01 (E12-7) | L - W-B G - W-B R - W-B W - W-B | Injector | Idling | Pulse generation (see waveform 6)
IGT1 (E12-17) - E1 (E12-3) IGT2 (E12-16) - E1 (E12-3) IGT3 (E12-15) - E1 (E12-3) IGT4 (E12-14) - E1 (E12-3) | R - BR R-L - BR G-B - BR G - BR | Ignition coil with igniter ignition signal | Idling | Pulse generation (see waveform 5)
IGF (E12-23) - E1 (E12-3) | G-R - BR | Ignition coil with igniter (ignition confirmation signal) | Ignition switch ON | 4.5 to 5.5 V
IGF (E12-23) - E1 (E12-3) | G-R - BR | Ignition coil with igniter (ignition confirmation signal) | Idling | Pulse generation (see waveform 5)
G2+ (E12-26) - NE- (E12-34) | R - G | Camshaft position sensor | Idling | Pulse generation (see waveform 3)
NE+ (E12-27) - NE- (E12-34) | L - G | Crankshaft position sensor | Idling | Pulse generation (see waveform 3)
FC (E9-25) - E01 (E12-7) | LG-B - W-B | Fuel pump control | Ignition switch ON | 9 to 14 V
M+ (E12-5) - ME01(E11-3) | B - W-B | Throttle actuator | Idling | Pulse generation (see waveform 1)
M- (E12-4) - ME01(E11-3) | W - W-B | Throttle actuator | Idling | Pulse generation (see waveform 2)
KNK1 (E12-29) - EKNK (E12-30) | B - W | Knock sensor | Maintain engine speed at 4,000 rpm after warming up engine | Pulse generation (see waveform 8)
OC+ (E12-13) - OC1- (E12-12) | P-L - Y | Camshaft timing oil control valve | Ignition switch ON | Pulse generation (see waveform 7)
STA (E9-12) - E1 (E12-3) | L-Y - BR | Starter signal | Shift position on P or N, ignition switch START | 6.0 V or more
OX1A (E12-21) - E2 (E12-28) | B -BR | Heated oxygen sensor | Maintain engine speed at 2,500 rpm for 2 minutes after warming up sensor | Pulse generation (see waveform 9)
HT1A (E12-1) - E1 (E12-3) | Y - BR | Heated oxygen sensor heater | Ignition switch ON | 9 to 14 V
ALT (E12-10) - E1 (E12-3) | G - BR | Generator | Ignition switch ON | 9 to 14 V
STP (E10-4) - E1 (12-3) | G-W - BR | Stop light switch | Brake pedal depressed | 9 to 14 V
STP (E10-4) - E1 (12-3) | G-W - BR | Stop light switch | Brake pedal released | Below 1.5 V
ST1- (E9-16) - E1 (E12-3) | R-L - BR | Stop light switch | Ignition switch ON, brake pedal depressed | Below 1.5 V
ST1- (E9-16) - E1 (E12-3) | R-L - BR | Stop light switch | Ignition switch ON, brake pedal released | 7.5 to 14 V
W (E10-30) - E1 (E12-3) | R-B - BR | MIL | Idling | 9 to 14 V
W (E10-30) - E1 (E12-3) | R-B - BR | MIL | Ignition switch ON | Below 3.0 V
ELS1 (E9-15) - E1 (E12-3) | G - BR | Electric load | Taillight switch on | 7.5 to 14 V
ELS1 (E9-15) - E1 (E12-3) | G - BR | Electric load | Taillight switch off | 0 to 1.5 V
TACH (E10-1) - E1 (E12-3) | B-W - BR | Engine speed | Idling | Pulse generation
SPD (E10-8) - E1 (E12-3) | V-R - BR | Speed signal from combination meter | Ignition switch ON, slowly turn wheel | Pulse generation (see waveform 4)
TC (E10-17) - E1 (E12-3) | P-B - BR | Terminal TC of DLC3 | Ignition switch ON | 9 to 14 V
SIL (E10-13) - E1 (E12-3) | R-Y - BR | Terminal SIL of DLC3 | Connect intelligent tester II to DLC3 | Pulse generation
PSW (E11-32) - E1 (E12-3) | G-Y - BR | Power steering oil pressure switch | While turning steering wheel | Below 1.5 V
F/PS (E10-32) - E1 (E12-3) | B - BR* | Center airbag sensor assembly | Ignition switch ON | Pulse generation

HINT:

  *: w/ Airbag

Waveform 1 (Reference)

Throttle actuator positive terminal
Item | Content
Symbols (Terminal No.) | M+ (E12-5) - ME01 (E11-3)
Tool Setting | 5 V/DIV., 1 msec./DIV.
Condition | Idle after engine warm-up

HINT:

  The duty ratio varies depending on the throttle opening operation.

Waveform 2 (Reference)

Throttle actuator negative terminal
Item | Content
Symbols (Terminal No.) | M- (E12-4) - ME01 (E11-3)
Tool Setting | 5 V/DIV., 1 msec./DIV.
Condition | Idle after engine warm-up

HINT:

  The duty ratio varies depending on the throttle opening operation.

Waveform 3 (Reference)

(a) Camshaft position sensor
Item | Content
Symbols (Terminal No.) | (a) G2+ (E12-26) - NE- (E12-34)
Tool Setting | 5 V/DIV., 20 msec./DIV.
Condition | Idle after engine warm-up

(b) Crankshaft position sensor
Item | Content
Symbols (Terminal No.) | (b) NE+ (E12-27) - NE- (E12-34)
Tool Setting | 5 V/DIV., 20 msec./DIV.
Condition | Idle after engine warm-up

HINT:

  The wavelength becomes shorter as engine speed increases.

Waveform 4 (Reference)

Vehicle speed signal
Item | Content
Symbols (Terminal No.) | SPD (E10-8) - E1 (E12-3)
Tool Setting | 2 V/DIV., 10 msec./DIV.
Condition | Driving at 40 km/h (25 mph)

HINT:

  The wavelength becomes shorter as vehicle speed increases.

Waveform 5 (Reference)

(a) Igniter IGT signal (from ECM to igniter)
Item | Content
Symbols (Terminal No.) | (a) IGT1 (E12-17) to IGT4 (E12-14) - E1 (E12-3)
Tool Setting | 2 V/DIV., 20 msec./DIV.
Condition | Idling

(b) Igniter IGF signal (from igniter to ECM)
Item | Content
Symbols (Terminal No.) | (b) IGF1 (E12-23) - E1 (E12-3)
Tool Setting | 2 V/DIV., 20 msec./DIV.
Condition | Idling

HINT:

  The wavelength becomes shorter as engine speed increases.

Waveform 6 (Reference)

Fuel injector
Item | Content
Symbols (Terminal No.) | #10 (E11-6) to #40 (E11-1) - E01 (E12-7)
Tool Setting | 20 V/DIV., 20 msec./DIV.
Condition | Idling

HINT:

  The wavelength becomes shorter as engine speed increases.

Waveform 7 (Reference)

VVT OCV
Item | Content
Symbols (Terminal No.) | OC+ (E12-13) - OC- (E12-12)
Tool Setting | 5 V/DIV., 1 msec./DIV.
Condition | Accelerate slowly after engine warm-up

HINT:

  VVT OCV DUTY (%) = A/B x 100

Waveform 8 (Reference)

Knock sensor
Item | Content
Symbols (Terminal No.) | KNK1 (E12-29) - EKNK (E12-30)
Tool Setting | 0.01 to 10 V/DIV., 0.01 to 10 msec./DIV.
Condition | After warming up engine, keep engine speed at 4,000 rpm

HINT:

1. The wavelength becomes shorter as engine speed increases.
2. The waveform and amplitudes displayed differ slightly depending on the vehicle.

Waveform 9 (Reference)

Heated oxygen (HO2) sensor (sensor 1)
Item | Content
Symbols (Terminal No.) | OX1A (E12-21) - E2 (E12-28)
Tool Setting | 0.2 V/DIV., 200 msec./DIV.
Condition | Engine maintained at 2,500 rpm when engine warmed up

HINT:

  In the Data List, item O2S B1 S1 shows the ECM input values from the rear HO2 sensor (sensor 1).