SFI SYSTEM > TERMINALS OF ECM

for Preparation Click here



A199322E01

HINT:
The standard normal voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of the terminals, and 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
A18-20 (BATT) - B8-105 (E1)
B - BR
Battery (for measuring battery voltage and for ECM memory)
Always
11 to 14 V
A18-2 (+B) - B8-105 (E1)
W - BR
Power source of ECM
Ignition switch ON
11 to 14 V
A18-1 (+B2) - B8-105 (E1)
L - BR
Power source of ECM
Ignition switch ON
11 to 14 V
A18-3 (+BM) - B8-105 (E1)
R-W - BR
Power source of throttle actuator
Always
11 to 14 V
B8-109 (IGT1) - B8-105 (E1)
W - BR
Ignition coil
(ignition signal)
Idling
Pulse generation
(see waveform 1)
B8-108 (IGT2) - B8-105 (E1)
L - BR
B8-107 (IGT3) - B8-105 (E1)
GR - BR
B8-82 (IGF1) - B8-105 (E1)
Y - BR
Ignition coil
(ignition confirmation signal)
Ignition switch ON
4.5 to 5.5 V
Idling
Pulse generation
(see waveform 1)
B8-93 (NE+) - B8-117 (NE-)
G - P-L
Crankshaft position sensor
Idle after engine warmed-up
Pulse generation
(see waveform 2)
B8-94 (G2+) - B8-117 (NE-)
B - P-L
Camshaft position sensor
Idle after engine warmed-up
Pulse generation
(see waveform 2)
B8-86 (#10) - B8-46 (E01)
LG - W-B
Fuel injector
Ignition switch ON
11 to 14 V
B8-85 (#20) - B8-46 (E01)
P - W-B
B8-84 (#30) - B8-46 (E01)
V - W-B
Idling
Pulse generation
(see waveform 3)
B8-104 (HA1A) - B8-41 (E04)
B - W-B
Air fuel ratio sensor (sensor 1) heater
Ignition switch ON
11 to 14 V
Idle after engine warmed-up
Pulse generation
(see waveform 4)
B8-103 (A1A+) - B8-105 (E1)
L - BR
Air fuel ratio sensor (sensor 1)
Idling
Below 3.3 V*1
B8-126 (A1A-) - B8-105 (E1)
G - BR
Air fuel ratio sensor (sensor 1)
Idling
Below 2.9 V*1
B8-63 (HT1B) - B8-81 (E03)
B - W-B
Heated oxygen sensor (sensor 2) heater
Ignition switch ON
11 to 14 V
Idling
Below 3.0 V
B8-80 (OX1B) - B8-79 (O1B-)
G - R
Heated oxygen sensor (sensor 2)
Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor
Pulse generation
(see waveform 5)
B8-110 (KNK1) - B8-111 (EKNK)
B - W
Knock sensor
Engine speed maintained at 4000 after warming up engine
Pulse generation
(see waveform 6)
A18-38 (SPD) - B8-105 (E1)
R-B - BR
Speed signal from combination meter
Rotate driving wheel slowly
Pulse generation
(see waveform 7)
B8-66 (THW) - B8-65 (ETHW)
LG - P
Engine coolant temperature sensor
Idling, Engine coolant temperature 80°C (176°F)
0.2 to 1.0 V
B8-87 (THA) - B8-120 (E2)
R-Y - G-R
Intake air temperature sensor (built into manifold absolute pressure sensor)
Idling, Intake air temperature 20°C (68°F)
1.5 to 3.0 V
B8-114 (PIM) - B8-120 (E2)
L-Y - G-R
Manifold absolute pressure sensor
Idling
1.2 to 2.0 V
A18-24 (W) - B8-105 (E1)
P-B - BR
MIL
Ignition switch ON (MIL goes on)
Below 3.0 V
Idling
11 to 14 V
A18-48 (STA) - B8-105 (E1)
W-R - BR
Starter signal
Ignition switch ON
Below 1.5 V
Cranking
11 to 14 V
A18-25 (NSW) - B8-105 (E1)
GR - BR
Clutch pedal switch signal*2
Park/Neutral position switch signal*3
Ignition switch ON, Clutch pedal fully depressed*2
Below 1.5 V
Ignition switch ON, Clutch pedal released*2
11 to 14 V
Ignition switch ON, shift lever in P, N*3
Below 1.5 V
Ignition switch ON, shift lever not in P, N*3
11 to 14 V
Cranking
11 to 14 V
B8-113 (VTA1) - B8-90 (ETA)
W - B
Throttle position sensor (for engine control)
Ignition switch ON, Throttle valve fully closed
0.5 to 1.1 V
Ignition switch ON, Throttle valve fully open
3.2 to 4.8 V
B8-112 (VTA2) - B8-90 (ETA)
GR - B
Throttle position sensor (for sensor malfunction detection)
Ignition switch ON, Accelerator pedal released
2.1 to 3.1 V
Ignition switch ON, Accelerator pedal depressed
4.5 to 5.5 V
B8-89 (VCTA) - B8-90 (ETA)
Y - B
Power source of sensor (specific voltage)
Ignition switch ON
4.5 to 5.5 V
A18-57 (VCPA) - A18-59 (EPA)
G-R - LG
Power source of accelerator pedal position sensor (for VPA)
Ignition switch ON
4.5 to 5.5 V
A18-55 (VPA) - A18-59 (EPA)
LG-R - LG
Accelerator pedal position sensor (for engine control)
Ignition switch ON, Accelerator pedal released
0.5 to 1.1 V
Ignition switch ON, Accelerator pedal fully depressed
2.5 to 4.5 V
A18-56 (VPA2) - A18-60 (EPA2)
V-Y - V
Accelerator pedal position sensor (for sensor malfunctioning detection)
Ignition switch ON, Accelerator pedal released
1.2 to 2.0 V
Ignition switch ON, Accelerator pedal fully depressed
3.4 to 5.5 V
A18-58 (VCP2) - A18-60 (EPA2)
L-W - V
Power source of accelerator pedal position sensor (for VPA2)
Ignition switch ON
4.5 to 5.5 V
B8-43 (M+) - B8-44 (ME01)
G - BR
Throttle actuator
Idling with warm engine
Pulse generation
(see waveform 8)
B8-42 (M-) - B8-44 (ME01)
R - BR
Throttle actuator
Idling with warm engine
Pulse generation
(see waveform 9)
A18-36 (STP) - B8-105 (E1)
Y - BR
Stop light switch
Brake pedal depressed
11 to 14 V
Brake pedal released
Below 1.5 V
A18-35 (ST1-) - B8-105 (E1)
R-L - BR
Stop light switch
Ignition switch ON, Brake pedal depressed
Below 1.5 V
Ignition switch ON, Brake pedal released
11 to 14 V
B8-62 (PRG) - B8-105 (E1)
L-W - BR
Purge VSV
Ignition switch ON
11 to 14 V
Idling, under purge control
Pulse generation
(see waveform 10)
A18-19 (FC) - B8-105 (E1)
P - BR
Fuel pump control
Ignition switch ON
11 to 14 V
Idling
Below 1.5 V
A18-15 (TACH) - B8-105 (E1)
R-Y - BR
Engine speed
Idling
Pulse generation
(see waveform 11)
A18-40 (TC) - B8-105 (E1)
R-G - BR
Terminal TC of DLC3
Ignition switch ON
11 to 14 V
B8-97 (OC1+) - B8-96 (OC1-)
G - R-W
Camshaft timing oil control valve (OCV)
Idling
Pulse generation
(see waveform 12)
B8-38 (ACM) - B8-105 (E1)
Y - BR
VSV (for engine mounting)
Idling
Below 1.5 V
A18-8 (CANH) - B8-105 (E1)
L - BR
CAN communication line
Ignition switch ON
Pulse generation
(see waveform 13)
A18-9 (CANL) - B8-105 (E1)
W - BR
CAN communication line
Ignition switch ON
Pulse generation
(see waveform 14)
B8-51 (EGR1) - A18-105 (E1)
R-B - BR
EGR valve
Racing engine
Pulse generation
(see waveform 15)
B8-50 (EGR2) - A18-105 (E1)
B-Y - BR
B8-49 (EGR3) - A18-105 (E1)
W-G - BR
B8-48 (EGR4) - A18-105 (E1)
B-R - BR
A18-21 (FANL) - B8-105 (E1)
LG - BR
NO. 1 FAN relay
Ignition switch ON
11 to 14 V
Idling with A/C ON
or
High engine coolant temperature
Below 1.5 V
A18-22 (FANH) - B8-105 (E1)
G-R - BR
NO. 2 FAN relay
Idling with high engine coolant temperature
Below 1.5 V
A18-27 (IGSW) - B8-105 (E1)
G-W - BR
Ignition switch
Ignition switch ON
11 to 14 V
A18-44 (MREL) - B8-105 (E1)
L-Y - BR
EFI relay
Ignition switch ON
11 to 14 V
B8-67 (VC) - B8-105 (E1)
LG-R - BR
Power source of manifold absolute pressure sensor
Ignition switch ON
4.5 to 5.5 V
A18-31 (ELS) - B8-105 (E1)
L-R - BR
Electric load
Tail light switch on
7.5 to 14 V
Tail light switch off
Below 1.5 V
A18-50 (ELS2) - B8-105 (E1)
W-L - BR
Electric load
Defogger switch on
7.5 to 14 V
Defogger switch off
Below 1.5 V

HINT:
*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
*2: for Manual transaxle.
*3: for CVT.


WAVEFORM 1
A122717E11
Igniter IGT Signal (from ECM to Igniter) 
ECM Terminal Name
Between IGT (1 to 3) and E1
Between IGF1 and E1
Tester Range
2 v/DIV, 20 ms/DIV
Condition
Idling

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


WAVEFORM 2
A122557E03
Crankshaft Position Sensor and Camshaft Position Sensor 
ECM Terminal Name
CH1: Between G2+ and NE-
CH2: Between NE+ and NE-
Tester Range
5 v/DIV, 20 ms/DIV
Condition
Idle after engine warmed-up

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


WAVEFORM 3
A093279E15
No. 1 (to No. 3) Injector Signal 
ECM Terminal Name
Between #10 (to #30) and E01
Tester Range
20 v/DIV, 20 ms/DIV
Condition
Idling

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


WAVEFORM 4
A159460E01
Air Fuel Ratio Sensor (Sensor 1) Heater 
ECM Terminal Name
Between HA1A and E04
Tester Range
5 v/DIV, 10 ms/DIV
Condition
Idle after engine warmed-up

HINT:
The wavelength varies in accordance with the engine operating condition.


WAVEFORM 5
A088863E24
Heated Oxygen Sensor (Sensor 2) 
ECM Terminal Name
Between OX1B and O1B-
Tester Range
0.2 v/DIV, 200 ms/DIV
Condition
Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor

HINT:
In the Data List, the item O2S B1S2 show the values input to the ECM from the heated oxygen sensor.


WAVEFORM 6
A085286E46
Knock Sensor 
ECM Terminal Name
Between KNK1 and EKNK
Tester Range
500 mv/DIV, 1 ms/DIV
Condition
Maintain engine speed at 4000 rpm after engine warmed-up

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


WAVEFORM 7
A005135E36
Vehicle Speed Signal 
ECM Terminal Name
Between SPD and E1
Tester Range
5 v/DIV, 20 ms/DIV
Condition
Rotate driving wheel slowly

HINT:
The wavelength becomes shorter as the vehicle speed increases.


WAVEFORM 8
A208000E01
Throttle Actuator Positive Terminal 
ECM Terminal Name
Between M+ and ME01
Tester Range
5 v/DIV, 1 ms/DIV
Condition
Idle after engine warmed-up

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


WAVEFORM 9
A208001E01
Throttle Actuator Negative Terminal 
ECM Terminal Name
Between M- and ME01
Tester Range
5 v/DIV, 1 ms/DIV
Condition
Idle after engine warmed-up

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


WAVEFORM 10
A149742E03
Purge VSV 
ECM Terminal Name
Between PRG and E1
Tester Range
10 v/DIV, 20 ms/DIV
Condition
Idling, under purge control

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


WAVEFORM 11
A093225E21
Engine Speed Signal 
ECM Terminal Name
Between TACH and E1
Tester Range
5 v/DIV, 10 ms/DIV
Condition
Idling

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


WAVEFORM 12
A093229E35
Camshaft Timing Oil Control Valve (OCV) 
ECM Terminal Name
Between OC1+ and OC1-
Tester Range
5 v/DIV, 1 ms/DIV
Condition
Idling

WAVEFORM 13
A086154E25
CAN Communication Signal (Reference) 
ECM Terminal Name
Between CANH and E1
Tester Range
1 v/DIV, 10 μs/DIV
Condition
Engine stopped and ignition switch ON

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


WAVEFORM 14
A086155E26
CAN Communication Signal (Reference) 
ECM Terminal Name
Between CANL and E1
Tester Range
1 v/DIV, 10 μs/DIV
Condition
Engine stopped and ignition switch ON

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


WAVEFORM 15
A208002E01
EGR Valve 
ECM Terminal Name
EGR1, EGR2, EGR3, EGR4 and E1
Tester Range
20 v/DIV, 50 ms/DIV
Condition
Repeated quick engine rpm acceleration