SFI SYSTEM > TERMINALS OF ECM

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A053766E07

HINT:
Each ECM terminal's standard 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 (A6-4) - E1 (E7-7)
L - BR
Battery (for measuring battery voltage and for the ECM memory)
Always
9 to 14 V
+BM (E8-5) - ME01 (E8-4)
P - BR
Power source of throttle motor
Always
9 to 14 V
IGSW (A6-17) - E1 (E7-7)
B-W - BR
Engine switch
Engine switch on (IG)
9 to 14 V
+B (A6-6) - E1 (E7-7)
B-R - BR
Power source of ECM
Engine switch on (IG)
9 to 14 V
+B1 (A6-5) - E1 (E7-7)
B-R - BR
Power source of ECM
Engine switch on (IG)
9 to 14 V
VC (E8-29) - E2 (E8-28)
L-Y - BR
Power source of sensor
(specific voltage)
Engine switch on (IG)
4.5 to 5.5 V
VTA (E8-23) - E2 (E8-28)
R-L - BR
Throttle position sensor
(for engine control)
Engine switch on (IG), accelerator pedal fully released
0.5 to 1.2 V
VTA (E8-23) - E2 (E8-28)
R-L - BR
Throttle position sensor
(for engine control)
Engine switch on (IG), accelerator pedal fully depressed
3.2 to 4.8 V
VTA2 (E8-22) - E2 (E8-28)
L-B - BR
Throttle position sensor
(for sensor malfunction detection)
Engine switch on (IG), accelerator pedal fully released
2.1 to 3.1 V
VTA2 (E8-22) - E2 (E8-28)
L-B - BR
Throttle position sensor
(for sensor malfunction detection)
Engine switch on (IG), accelerator pedal fully depressed
4.5 to 5.5 V
VPA (A7-33) - EPA (A7-34)
G-W - L-Y
Accelerator pedal position sensor
(for engine control)
Engine switch on (IG), accelerator pedal fully released
0.5 to 1.1 V
VPA (A7-33) - EPA (A7-34)
G-W - L-Y
Accelerator pedal position sensor
(for engine control)
Engine switch on (IG), accelerator pedal fully depressed
2.6 to 4.5 V
VPA2 (A7-32) - EPA2 (A7-26)
P-L - BR
Accelerator pedal position sensor
(for sensor malfunction detection)
Engine switch on (IG), accelerator pedal fully released
1.2 to 2.0 V
VPA2 (A7-32) - EPA2 (A7-26)
P-L - BR
Accelerator pedal position sensor
(for sensor malfunction detection)
Engine switch on (IG), accelerator pedal fully depressed
3.4 to 5.3 V
VCPA (A7-35) - EPA (A7-34)
P - L-Y
Power source of accelerator pedal position sensor (for VPA)
Engine switch on (IG)
4.5 to 5.5 V
VCP2 (A7-27) - EPA2 (A7-26)
LG - BR
Power source of accelerator pedal position sensor (for VPA2)
Engine switch on (IG)
4.5 to 5.5 V
VG (E6-27) - E2G (E6-26)
G-B - B-W
MAF meter
Idling, shift position P or N, A/C switch off
0.5 to 3.0 V
THA (E6-25) - E2 (E8-28)
G - BR
IAT sensor
Idling, IAT: 0 to 80°C (32 to 176°F) after warm-up
0.5 to 3.4 V
THW (E6-20) - E2 (E8-28)
R - BR
ECT sensor
Idling, ECT: 60 to 100°C (140 to 212°F) after warm-up
0.2 to 1.0 V
STA (A6-12) - E1 (E7-7)
R - BR
Starter signal
Cranking (shift position P or N position and engine switch start)
6 V or more
#1 (E8-15) - E01 (E6-2)
#2 (E6-17) - E01 (E6-2)
#3 (E8-14) - E01 (E6-2)
#4 (E6-16) - E01 (E6-2)
#5 (E8-13) - E01 (E6-2)
#6 (E6-15) - E01 (E6-2)
#7 (E8-12) - E01 (E6-2)
#8 (E6-14) - E01 (E6-2)
Y-B - W-B
B-Y - W-B
R-W - W-B
LG - W-B
L-W - W-B
R - W-B
G-W - W-B
B-L - W-B
Injector
Idling
Pulse generation
(see waveform 1)
#1 (E8-15) - E01 (E6-2)
#2 (E6-17) - E01 (E6-2)
#3 (E8-14) - E01 (E6-2)
#4 (E6-16) - E01 (E6-2)
#5 (E8-13) - E01 (E6-2)
#6 (E6-15) - E01 (E6-2)
#7 (E8-12) - E01 (E6-2)
#8 (E6-14) - E01 (E6-2)
Y-B - W-B
B-Y - W-B
R-W - W-B
LG - W-B
L-W - W-B
R - W-B
G-W - W-B
B-L - W-B
Injector
Engine switch on (IG)
9 to 14 V
IGT1 (E8-17) - E1 (E7-7)
IGT2 (E6-13) - E1 (E7-7)
IGT3 (E8-16) - E1 (E7-7)
IGT4 (E6-12) - E1 (E7-7)
IGT5 (E8-27) - E1 (E7-7)
IGT6 (E6-11) - E1 (E7-7)
IGT7 (E8-26) - E1 (E7-7)
IGT8 (E6-10) - E1 (E7-7)
L-R - BR
L-B - BR
V - BR
P-L - BR
W-L - BR
W-L - BR
LG-B - BR
L-W - BR
Ignition coil and igniter
(ignition signal)
Idling
Pulse generation
(see waveform 2)
IGF1 (E6-7) - E1 (E7-7)
IGF2 (E6-6) - E1 (E7-7)
G-B - BR
R - BR
Ignition coil and igniter
(ignition confirmation signal)
Idling
Pulse generation
(see waveform 2)
IGF1 (E6-7) - E1 (E7-7)
IGF2 (E6-6) - E1 (E7-7)
G-B - BR
R - BR
Ignition coil and igniter
(ignition confirmation signal)
Engine switch on (IG)
4.5 to 5.5 V
G2 (E8-21) - G2- (E8-20)
Y - L
Camshaft position sensor
Idling
Pulse generation
(see waveform 3)
NE+ (E8-32) - NE- (E8-31)
R - G
Crankshaft position sensor
Idling
Pulse generation
(see waveform 3)
MREL (A6-13) - E1 (E7-7)
Y - BR
EFI MAIN relay
Engine switch on (IG)
9 to 14 V
MREL (A6-13) - E1 (E7-7)
Y - BR
EFI MAIN relay
Engine switch off (for 3 seconds or more)
Below 1.5 V
FPR (A6-15) - E01 (E6-2)
R-W - W-B
F/PMP relay
Engine switch on (IG)
Below 3 V
FPR (A6-15) - E01 (E6-2)
R-W - W-B
F/PMP relay
Cranking
6 to 14 V
FC (A6-14) - E01 (E6-2)
R-G - W-B
Fuel pump control
Engine switch on (IG)
9 to 14 V
FC (A6-14) - E01 (E6-2)
R-G - W-B
Fuel pump control
Idling after engine warm-up
Below 3 V
STP (A7-4) - E1 (E7-7)
R-B - BR
Stop light switch
Brake pedal is depressed
7.5 to 14 V
STP (A7-4) - E1 (E7-7)
R-B - BR
Stop light switch
Brake pedal is released
Below 1.5 V
ST1- (A6-8) - E1 (E7-7)
G-W - BR
Stop light switch
(opposite to STP terminal)
Engine switch on (IG)
Brake pedal is depressed
Below 1.5 V
ST1- (A6-8) - E1 (E7-7)
G-W - BR
Stop light switch
(opposite to STP terminal)
Engine switch on (IG)
Brake pedal is released
7.5 to 14 V
PRG (E8-11) - E01 (E6-2)
W - W-B
VSV for EVAP
Engine switch on (IG) and engine stopped
9 to 14 V
PRG (E8-11) - E01 (E6-2)
W - W-B
VSV for EVAP
Idling after engine warm-up
Pulse generation
(see waveform 4)
OX1A (E8-30) - O1A- (E8-25)
OX2A (E6-28) - O2A- (E6-21)
B - BR
W - BR
Heated oxygen sensor
(bank 1, 2 sensor 1)
Idling
0.1 to 0.9 V
Pulse generation
(see waveform 5)
OX1B (A7-28) - O1B- (A7-29)
OX2B (A7-17) - O2B- (A7-18)
W - LG-R
B - G
Heated oxygen sensor
(bank 1, 2 sensor 2)
Idling
0.1 to 0.9 V
Pulse generation
(see waveform 6)
HT1A (E8-24) - E03 (E8-6)
HT1B (A7-2) - E03 (E8-6)
HT2A (E6-5) - E03 (E8-6)
HT2B (A7-1) - E03 (E8-6)
B-W - W-B
Y-B - W-B
L-W - W-B
L-W - W-B
Heated oxygen sensor heater
Idling
Below 3.0 V
HT1A (E8-24) - E03 (E8-6)
HT1B (A7-2) - E03 (E8-6)
HT2A (E6-5) - E03 (E8-6)
HT2B (A7-1) - E03 (E8-6)
B-W - W-B
Y-B - W-B
L-W - W-B
L-W - W-B
Heated oxygen sensor heater
Engine switch on (IG)
9 to 14 V
KNK1 (E7-28) - EKNK (E7-30)
W - B
Knock sensor
(bank 1)
Maintain engine RPM at 4,000 rpm after engine warmed-up
Pulse generation
(see waveform 7)
KNK2 (E7-29) - EKN2 (E7-31)
R - G
Knock sensor
(bank 2)
Maintain engine RPM at 4,000 rpm after engine warmed-up
Pulse generation
(see waveform 7)
TC (A7-3) - E1 (E7-7)
V - BR
Terminal TC of DLC3
Engine switch on (IG)
9 to 14 V
W (A7-8) - E1 (E7-7)
R-L - BR
MIL
Idling
9 to 14 V
W (A7-8) - E1 (E7-7)
R-L - BR
MIL
Engine switch on (IG)
Below 3.0 V
VV1+ (E8-19) - VV1- (E8-18)
R - G
Variable Valve Timing (VVT) sensor
(bank 1)
Idling
Pulse generation
(see waveform 8)
VV2+ (E6-19) - VV2- (E6-18)
Y - L
VVT sensor (bank 2)
Idling
Pulse generation
(see waveform 8)
OC1+ (E8-34) - OC1- (E8-33)
R-B - L-R
Camshaft timing control valve (OCV)
(bank 1)
Accelerate slowly after engine warmed-up
Pulse generation
(see waveform 9)
OC2+ (E6-9) - OC2- (E6-8)
W - Y-B
OCV (bank 2)
Accelerate slowly after engine warmed-up
Pulse generation
(see waveform 9)
TACH (A7-16) - E1 (E7-7)
W-L - BR
Engine speed
Idling
Pulse generation
(see waveform 10)
ACIS (E6-3) - E01 (E6-2)
Y - W-B
Vacuum switching valve (for ACIS)
Engine switch on (IG)
9 to 14 V
ACIS (E6-3) - E01 (E6-2)
Y - W-B
Vacuum switching valve (for ACIS)
Engine RPM: 2,500 to 4,000 rpm and throttle opening angle: 40% or more
Below 3.0 V
M+ (E8-2) - ME01 (E8-4)
B - BR
Throttle actuator
Idling
Pulse generation
(see waveform 11)
M- (E8-1) - ME01 (E8-4)
W - BR
Throttle actuator
Idling
Pulse generation
(see waveform 12)
SPD (A6-22) - E1 (E7-7)
V-W - BR
Speed signal from combination meter
Engine switch on (IG), rotate driving wheel slowly
Pulse generation
(see waveform 13)
RFC (A6-10) - E1 (E7-7)
G-Y - BR
Cooling fan ECU
Engine switch on (IG)
0 to 3 V
E1 (E7-7) - Body ground
BR - N/A
Ground
Always
Below 1 Ω
CANH (A6-25) - E1 (E7-7)
R - BR
CAN communication line
Engine switch on (IG)
Pulse generation
(see waveform 14)
CANL (A6-24) - E1 (E7-7)
W - BR
CAN communication line
Engine switch on (IG)
Pulse generation
(see waveform 15)

WAVEFORM 1
A093279E05
  1. Fuel injector
Item
Content
Symbols (Terminal No.)
#1 (E8-15) - E01 (E6-2)
#2 (E6-17) - E01 (E6-2)
#3 (E8-14) - E01 (E6-2)
#4 (E6-16) - E01 (E6-2)
#5 (E8-13) - E01 (E6-2)
#6 (E6-15) - E01 (E6-2)
#7 (E8-12) - E01 (E6-2)
#8 (E6-14) - E01 (E6-2)
Tester Range
20 V/DIV., 20 msec./DIV.
Condition
Idling

HINT:
The wavelength becomes shorter as engine rpm increases.


WAVEFORM 2
A093278E10
  1. (a) Igniter IGT signal (from ECM to igniter)
    (b) Igniter IGF signal (from igniter to ECM)
Item
Content
Symbols (Terminal No.)
(a) IGT1 (E8-17) - E1 (E7-7)
(a) IGT2 (E6-13) - E1 (E7-7)
(a) IGT3 (E8-16) - E1 (E7-7)
(a) IGT4 (E6-12) - E1 (E7-7)
(a) IGT5 (E8-27) - E1 (E7-7)
(a) IGT6 (E6-11) - E1 (E7-7)
(a) IGT7 (E8-26) - E1 (E7-7)
(a) IGT8 (E6-10) - E1 (E7-7)
(b) IGF1 (IGF2) and E1
Tester Range
2 V/DIV., 20 msec./DIV.
Condition
Idling

HINT:
The wavelength becomes shorter as engine rpm increases.


WAVEFORM 3
A093276E06
  1. (a) Camshaft position sensor
    (b) Crankshaft position sensor
Item
Content
Symbols (Terminal No.)
(a) G2 (E8-21) - G2- (E8-20)
(b) NE+ (E8-32) - NE- (E8-31)
Tester Range
5 V/DIV., 20 msec./DIV.
Condition
Idle after engine warmed-up

HINT:
The wavelength becomes shorter as engine rpm increases.


WAVEFORM 4
A093280E03
  1. VSV for EVAP
Item
Content
Symbols (Terminal No.)
PRG (E8-11) - E01 (E6-2)
Tester Range
5 V/DIV., 50 msec./DIV.
Condition
Accelerated slowly after engine warmed-up

HINT:
In cases where the VSV for EVAP can be used to purge the EVAP, the waveform will not be displayed as shown in the illustration. In the Data List, the item EVAP PURGE VSV shows the duty ratio of voltage flowing to the purge valve.
Duty ratio for EVAP VSV (%) = A/B x 100


WAVEFORM 5
A093282E12
  1. Heated oxygen sensor (sensor 1)
Item
Content
Symbols (Terminal No.)
OX1A (E8-30) - O1A- (E8-25)
OX2A (E6-28) - O2A- (E6-21)
Tester Range
0.2 V/DIV., 200 msec./DIV.
Condition
Maintain engine speed at 2,500 rpm after engine warmed-up

HINT:
In the Data List, the items heated oxygen sensor B1 S1 and heated oxygen sensor B2 S1 show the ECM input values of the heated oxygen sensor (sensor 1).


WAVEFORM 6
A088863E07
  1. Heated oxygen sensor (sensor 2)
Item
Content
Symbols (Terminal No.)
OX1B (A7-28) - O1B- (A7-29)
OX2B (A7-17) - O2B- (A7-18)
Tester Range
0.2 V/DIV., 200 msec./DIV.
Condition
Maintain engine speed at 2,500 rpm after engine warmed-up

HINT:
In the Data List, the items heated oxygen sensor B1 S2 and heated oxygen sensor B2 S2 show the ECM input values of the heated oxygen sensor (sensor 2).


WAVEFORM 7
A082985E09
  1. Knock sensor
Item
Content
Symbols (Terminal No.)
KNK1 (E7-28) - EKNK (E7-30)
KNK2 (E7-29) - EKN2 (E7-31)
Tester Range
1 V/DIV., 1 msec./DIV.
Condition
Maintain engine speed at 2,000 rpm after engine warmed-up

HINT:
  1. The wavelength becomes shorter as engine rpm increases.
  2. The waveforms and amplitude displayed differ slightly depending on the vehicle.


WAVEFORM 8
A085260E10
  1. (a) VVT sensor bank 1
    (b) VVT sensor bank 2
    (c) Crankshaft position sensor
Item
Content
Symbols (Terminal No.)
(a) VV1+ (E8-19) - VV1- (E8-18)
(b) VV2+ (E6-19) - VV2- (E6-18)
(c) NE+ (E8-32) - NE- (E8-31)
Tester Range
2 V/DIV., 20 msec./DIV.
Condition
Idle after engine warmed-up

HINT:
The wavelength becomes shorter as engine rpm increases.


WAVEFORM 9
A093281E04
  1. VVT OCV
Item
Content
Symbols (Terminal No.)
OC1+ (E8-34) - OC1- (E8-33)
OC2+ (E6-9) - OC2- (E6-8)
Tester Range
5 V/DIV., 200 msec./DIV.
Condition
Accelerated slowly after engine warmed-up

HINT:
In the Data List, the items VVT OCV Duty B1 and B2 show the duty ratio of voltage flowing to the OCV (see the illustration).
VVT OCV Duty B1, B2 = A/B x 100 (%)


WAVEFORM 10
A093225E05
  1. Engine speed signal
Item
Content
Symbols (Terminal No.)
TACH (A7-16) - E1 (E7-7)
Tester Range
5 V/DIV., 10 msec./DIV.
Condition
Idling

HINT:
The wavelength becomes shorter as the engine rpm increases.


WAVEFORM 11
A093274E06
  1. Throttle actuator positive terminal
Item
Content
Symbols (Terminal No.)
M+ (E8-2) - ME01 (E8-4)
Tester Range
5 V/DIV., 1 msec./DIV.
Condition
Idle after engine warmed-up

HINT:
The duty ratio varies depending on the throttle opening operation.


WAVEFORM 12
A093275E06
  1. Throttle actuator negative terminal
Item
Content
Symbols (Terminal No.)
M- (E8-1) - ME01 (E8-4)
Tester Range
5 V/DIV., 1 msec./DIV.
Condition
Idle after engine warmed-up

HINT:
The duty ratio varies depending on the throttle opening operation.


WAVEFORM 13
A093224E06
  1. Vehicle speed signal
Item
Content
Symbols (Terminal No.)
SPD (A6-22) - E1 (E7-7)
Tester Range
2 V/DIV., 20 msec./DIV.
Condition
Driving at 20 km/h (12 mph)

HINT:
The wavelength becomes shorter as vehicle speed increases.


WAVEFORM 14
A086154E04
  1. CAN communication signal
Item
Content
Symbols (Terminal No.)
CANH (A6-25) - E1 (E7-7)
Tester Range
1 V/DIV., 10 μsec./DIV.
Condition
Engine switch on (IG)

HINT:
The waveform varies depending on the CAN communication signal.


WAVEFORM 15
A086155E04
  1. CAN communication signal
Item
Content
Symbols (Terminal No.)
CANL (A6-24) - E1 (E7-7)
Tester Range
1 V/DIV., 10 μsec./DIV.
Condition
Engine switch on (IG)

HINT:
The waveform varies depending on the CAN communication signal.