SFI SYSTEM > TERMINALS OF ECM

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A172057E15

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
A60-20 (BATT) - D27-104 (E1)
R - BR
Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory)
Always
11 to 14 V
A60-2 (+B) - D27-104 (E1)
B - BR
Power source of ECM
Power switch on (IG)
11 to 14 V
A60-1 (+B2) - D27-104 (E1)
B - BR
Power source of ECM
Power switch on (IG)
11 to 14 V
A60-3 (+BM) - D27-104 (E1)
GR - BR
Power source of throttle actuator
Always
11 to 14 V
D27-108 (IGT1) - D27-104 (E1)
GR - BR
Ignition coil assembly
(ignition signal)
Idling
Pulse generation
(see waveform 1)
D27-107 (IGT2) - D27-104 (E1)
W - BR
D27-106 (IGT3) - D27-104 (E1)
G - BR
D27-105 (IGT4) - D27-104 (E1)
Y - BR
D27-23 (IGF1) - D27-104 (E1)
L - BR
Ignition coil assembly
(ignition confirmation signal)
Power switch on (IG)
4.5 to 5.5 V
Idling
Pulse generation
(see waveform 1)
D27-74 (NE+) - D27-120 (NE-)
B - W
Crankshaft position sensor
Idling with warm engine
Pulse generation
(see waveform 2)
D27-76 (G2+) - D27-122 (G2-)
B - W
Camshaft position sensor
Idling with warm engine
Pulse generation
(see waveform 2)
D27-85 (#10) - D27-109 (E01)
Y - BR
Fuel injector assembly
Power switch on (IG)
11 to 14 V
D27-84 (#20) - D27-109 (E01)
B - BR
D27-83 (#30) - D27-109 (E01)
L - BR
D27-82 (#40) - D27-109 (E01)
R - BR
D27-85 (#10) - D27-109 (E01)
Y - BR
Fuel injector assembly
Idling
Pulse generation
(see waveform 3)
D27-84 (#20) - D27-109 (E01)
B - BR
D27-83 (#30) - D27-109 (E01)
L - BR
D27-82 (#40) - D27-109 (E01)
R - BR
D27-18 (HA1A) - D27-46 (E04)
Y - BR
Air fuel ratio sensor (sensor 1) heater
Power switch on (IG)
11 to 14 V
Idling with warm engine
Pulse generation
(see waveform 4)
D27-103 (A1A+) - D27-104 (E1)
Y - BR
Air fuel ratio sensor (sensor 1)
Idling
3.3 V*1
D27-126 (A1A-) - D27-104 (E1)
BR - BR
Air fuel ratio sensor (sensor 1)
Idling
3.0 V*1
D27-41 (HT1B) - D27-86 (E03)
BR - BR
Heated oxygen sensor (sensor 2) heater
Power switch on (IG)
11 to 14 V
Idling
Below 3.0 V
D27-125 (OX1B) - D27-102 (O1B-)
L - P
Heated oxygen sensor (sensor 2)
Engine speed maintained at 2500 rpm for 2 minutes after warming up engine
Pulse generation
(see waveform 5)
D27-87 (KNK1) - D27-110 (EKNK)
B - W
Knock control sensor
Engine speed maintained at 2500 rpm after warming up engine
Pulse generation
(see waveform 6)
D27-64 (THW) - D27-65 (ETHW)
P - BR
Engine coolant temperature sensor
Idling, Engine coolant temperature 80°C (176°F)
0.2 to 1.0 V
D27-116 (THA) - D27-93 (ETHA)
P - BR
Intake air temperature sensor (built into mass air flow meter sub-assembly)
Idling, Intake air temperature 20°C (68°F)
0.5 to 3.4 V
D27-94 (VG) - D27-117 (E2G)
B - W
Mass air flow meter sub-assembly
Idling, shift lever in N, A/C switch OFF
0.5 to 3.0 V
A60-36 (W) - D27-104 (E1)
LG - BR
MIL
Power switch on (IG) (MIL goes on)
Below 3.0 V
Idling
11 to 14 V
D27-90 (VTA1) - D27-111 (ETA)
Y - G
Throttle position sensor (for engine control)
Accelerator pedal released
(Throttle valve fully closed)
0.5 to 1.1 V
D27-89 (VTA2) - D27-111 (ETA)
B - G
Throttle position sensor (for sensor malfunction detection)
Accelerator pedal released
(Throttle valve fully closed)
2.1 to 3.1 V
D27-88 (VCTA) - D27-111 (ETA)
R - G
Power source of throttle position sensor (specific voltage)
Power switch on (IG)
4.5 to 5.5 V
D27-21 (M+) - D27-19 (ME01)
L - BR
Throttle actuator
Idling with warm engine
Pulse generation
(see waveform 7)
D27-20 (M-) - D27-19 (ME01)
P - BR
Throttle actuator
Idling with warm engine
Pulse generation
(see waveform 8)
D27-28 (PRG) - D27-104 (E1)
V - BR
Purge VSV
Power switch on (IG)
11 to 14 V
Idling, under purge control
Pulse generation
(see waveform 9)
A60-8 (FC) - D27-104 (E1)
R - BR
Fuel pump control
Power switch on (IG)
11 to 14 V
Idling
Below 1.5 V
A60-7 (TC) - D27-104 (E1)
P - BR
Terminal TC of DLC3
Power switch on (IG)
11 to 14 V
A60-26 (TACH) - D27-104 (E1)
B - BR
Engine speed
Idling
Pulse generation
(see waveform 10)
D27-36 (OC1+) - D27-59 (OC1-)
Y - G
Camshaft timing oil control valve assembly
Idling
Pulse generation
(see waveform 11)
A60-13 (CANH) - D27-104 (E1)
P - BR
CAN communication line
Engine stopped and power switch on (IG)
Pulse generation
(see waveform 12)
A60-5 (CANL) - D27-104 (E1)
V - BR
CAN communication line
Engine stopped and power switch on (IG)
Pulse generation
(see waveform 13)
A60-12 (CANP) - D27-104 (E1)
B - BR
CAN communication line
Engine stopped and power switch on (IG)
Pulse generation
(see waveform 12)
A60-4 (CANN) - D27-104 (E1)
W - BR
CAN communication line
Engine stopped and power switch on (IG)
Pulse generation
(see waveform 13)
A60-28 (IGSW) - D27-104 (E1)
W - BR
Power switch
Power switch on (IG)
11 to 14 V
A60-6 (MREL) - D27-104 (E1)
G - BR
EFI MAIN relay
Power switch on (IG)
11 to 14 V
D27-99 (VCV1) - D27-104 (E1)
R - BR
Power source of camshaft position sensor
Power switch on (IG)
4.5 to 5.5 V
A60-10 (WPO) - D27-104 (E1)
L - BR
Engine water pump assembly
Idling with warm engine
Pulse generation
(see waveform 14)
A60-11 (WPI) - D27-104 (E1)
G - BR
Engine water pump assembly
Idling with warm engine
Pulse generation
(see waveform 15)
D27-72 (VCPM) - D27-71 (EPIM)
L - Y
Manifold absolute pressure sensor
Power switch on (IG)
4.5 to 5.5 V
D27-69 (PIM) - D27-71 (EPIM)
B - Y
Manifold absolute pressure sensor
Power switch on (IG)
3.0 to 5.0 V
D27-45 (EGR1) - D27-104 (E1)
R - BR
EGR valve assembly
Repeating quick engine speed accelerations
Pulse generation
(see waveform 16)
D27-44 (EGR2) - D27-104 (E1)
V - BR
EGR valve assembly
Repeating quick engine speed accelerations
Pulse generation
(see waveform 16)
D27-43 (EGR3) - D27-104 (E1)
Y - BR
EGR valve assembly
Repeating quick engine speed accelerations
Pulse generation
(see waveform 16)
D27-42 (EGR4) - D27-104 (E1)
LG - BR
EGR valve assembly
Repeating quick engine speed accelerations
Pulse generation
(see waveform 16)
D27-48 (G2O) - D27-104 (E1)
Y - BR
Camshaft position signal
Idling
Pulse generation
(see waveform 17)
A60-22 (FANH) - D27-104 (E1)
LG - BR
Cooling fan relay
Power switch on (IG)
11 to 14 V
A60-21 (FANL) - D27-104 (E1)
L - BR
Cooling fan relay
Power switch on (IG)
11 to 14 V
A60-46 (PWMS) - D27-104 (E1)
G - BR
Combination switch assembly (mode switch)
Power switch on (IG), mode switch being turned and held at SPORT position
0 to 1.5 V
A60-30 (NE01) - D27-104 (E1)
L - BR
Combination switch assembly (mode switch)
Power switch on (IG), mode switch being pushed and held at NORMAL position
0 to 1.5 V
D27-104 (E1) - Body ground
BR - Body ground
Ground
Always
Below 1 Ω
D27-109 (E01) - Body ground
BR - Body ground
Ground
Always
Below 1 Ω
D27-81 (E02) - Body ground
W-B - Body ground
Ground
Always
Below 1 Ω
D27-86 (E03) - Body ground
BR - Body ground
Ground
Always
Below 1 Ω
D27-46 (E04) - Body ground
BR - Body ground
Ground
Always
Below 1 Ω
A60-32 (EC) - Body ground
W-B - Body ground
Ground
Always
Below 1 Ω
D27-22 (GE01) - D27-104 (E1)
W-B - BR
Shield earth (ground) circuit of throttle actuator
Always
Below 1 V

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


WAVEFORM 1
A205550E10
Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM) 
Terminal No. (symbol)
Tool Setting
Condition
D27-108 (IGT1) - D27-104 (E1)
2 V/DIV., 20 ms./DIV.
Idling
D27-107 (IGT2) - D27-104 (E1)
2 V/DIV., 20 ms./DIV.
Idling
D27-106 (IGT3) - D27-104 (E1)
2 V/DIV., 20 ms./DIV.
Idling
D27-105 (IGT4) - D27-104 (E1)
2 V/DIV., 20 ms./DIV.
Idling
D27-23 (IGF1) - D27-104 (E1)
2 V/DIV., 20 ms./DIV.
Idling

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


WAVEFORM 2
A216090E03
Crankshaft Position Sensor and Camshaft Position Sensor Signal 
Terminal No. (symbol)
Tool Setting
Condition
D27-74 (NE+) - D27-120 (NE-)
5 V/DIV., 20 ms./DIV.
Idling with warm engine
D27-76 (G2+) - D27-122 (G2-)
5 V/DIV., 20 ms./DIV.
Idling with warm engine

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


WAVEFORM 3
A093279E33
No. 1 (to No. 4) Fuel Injector Assembly Signal 
Terminal No. (symbol)
Tool Setting
Condition
D27-85 (#10) - D27-109 (E01)
20 V/DIV., 20 ms./DIV.
Idling
D27-84 (#20) - D27-109 (E01)
20 V/DIV., 20 ms./DIV.
Idling
D27-83 (#30) - D27-109 (E01)
20 V/DIV., 20 ms./DIV.
Idling
D27-82 (#40) - D27-109 (E01)
20 V/DIV., 20 ms./DIV.
Idling

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


WAVEFORM 4
A168188E01
Air Fuel Ratio Sensor (Sensor 1) Heater Signal 
Terminal No. (symbol)
Tool Setting
Condition
D27-18 (HA1A) - D27-46 (E04)
5 V/DIV., 10 ms./DIV.
Idling with warm engine

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


WAVEFORM 5
A088863E47
Heated Oxygen Sensor (Sensor 2) Signal 
Terminal No. (symbol)
Tool Setting
Condition
D27-125 (OX1B) - D27-102 (O1B-)
0.2 V/DIV., 200 ms./DIV.
Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

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


WAVEFORM 6
A194185E01
Knock Control Sensor Signal 
Terminal No. (symbol)
Tool Setting
Condition
D27-87 (KNK1) - D27-110 (EKNK)
1 V/DIV., 1 ms./DIV.
Engine speed maintained at 2500 rpm after warming up engine

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


WAVEFORM 7
A208000E03
Throttle Actuator Positive Terminal Signal 
Terminal No. (symbol)
Tool Setting
Condition
D27-21 (M+) - D27-19 (ME01)
5 V/DIV., 1 ms./DIV.
Idling with warm engine

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


WAVEFORM 8
A245848E01
Throttle Actuator Negative Terminal Signal 
Terminal No. (symbol)
Tool Setting
Condition
D27-20 (M-) - D27-19 (ME01)
5 V/DIV., 1 ms./DIV.
Idling with warm engine

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


WAVEFORM 9
A149742E10
Purge VSV 
Terminal No. (symbol)
Tool Setting
Condition
D27-28 (PRG) - D27-104 (E1)
10 V/DIV., 20 ms./DIV.
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 10
A194181E04
Engine Speed Signal 
Terminal No. (Symbol)
Tool Setting
Condition
A60-26 (TACH) - D27-104 (E1)
5 V/DIV., 10 ms./DIV.
Idling

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


WAVEFORM 11
A194182E01
Camshaft Timing Oil Control Valve Assembly Signal 
Terminal No. (symbol)
Tool Setting
Condition
D27-36 (OC1+) - D27-59 (OC1-)
5 V/DIV., 1 ms./DIV.
Idling

WAVEFORM 12
A194183E02
CAN Communication Signal (Reference) 
Terminal No. (symbol)
Tool Setting
Condition
A60-13 (CANH) - D27-104 (E1)
1 V/DIV., 10 μsec./DIV.
Engine stopped and power switch on (IG)
A60-12 (CANP) - D27-104 (E1)
1 V/DIV., 10 μsec./DIV.
Engine stopped and power switch on (IG)

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


WAVEFORM 13
A194184E02
CAN Communication Signal (Reference) 
Terminal No. (symbol)
Tool Setting
Condition
A60-5 (CANL) - D27-104 (E1)
1 V/DIV., 10 μsec./DIV.
Engine stopped and power switch on (IG)
A60-4 (CANN) - D27-104 (E1)
1 V/DIV., 10 μsec./DIV.
Engine stopped and power switch on (IG)

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


WAVEFORM 14
A214025E01
Engine Water Pump Assembly Signal (from ECM to Engine Water Pump Assembly) 
Terminal No. (symbol)
Tool Setting
Condition
A60-10 (WPO) - D27-104 (E1)
5 V/DIV., 20 ms./DIV.
Idling with warm engine

HINT:
The wavelength becomes shorter as the engine water pump assembly speed increases.


WAVEFORM 15
A214025E01
Engine Water Pump Assembly Signal (from Engine Water Pump Assembly to ECM) 
Terminal No. (symbol)
Tool Setting
Condition
A60-11 (WPI) - D27-104 (E1)
5 V/DIV., 20 ms./DIV.
Idling with warm engine

HINT:
The wavelength becomes shorter as the engine water pump assembly speed increases.


WAVEFORM 16
A214026E01
EGR Valve Assembly Signal 
Terminal No. (symbol)
Tool Setting
Condition
D27-45 (EGR1) - D27-104 (E1)
20 V/DIV., 50 ms./DIV.
Repeating quick engine speed accelerations
D27-44 (EGR2) - D27-104 (E1)
20 V/DIV., 50 ms./DIV.
Repeating quick engine speed accelerations
D27-43 (EGR3) - D27-104 (E1)
20 V/DIV., 50 ms./DIV.
Repeating quick engine speed accelerations
D27-42 (EGR4) - D27-104 (E1)
20 V/DIV., 50 ms./DIV.
Repeating quick engine speed accelerations

WAVEFORM 17
A214025E01
Camshaft Revolution Signal from ECM to Power Management Control ECU and Inverter with Converter Assembly 
Terminal No. (symbol)
Tool Setting
Condition
D27-48 (G2O) - D27-104 (E1)
5 V/DIV., 20 ms./DIV.
Idling

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