ECD SYSTEM > TERMINALS OF ECM

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A157743E03

HINT:
The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated.
The result of the checks should be compared with the standard normal voltage for that pair of terminals, which is 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
A19-1 (+B) - A19-2 (E1)
G - W-B
Power source of ECM
Ignition switch ON
11 to 14 V
A19-61 (+B1) - A19-2 (E1)
B - W-B
Power source of ECM
Ignition switch ON
11 to 14 V
A19-23 (BATT) - A19-2 (E1)
L-B - W-B
Battery (for measuring the battery voltage and for the ECM memory)
Always
11 to 14 V
A19-7 (IGSW) - A19-2 (E1)
G-W - W-B
Ignition switch
Ignition switch ON
11 to 14 V
A19-22 (MREL) - A19-2 (E1)
L-Y - W-B
ECD
MAIN relay
Ignition switch ON
11 to 14 V
15 seconds elapsed after ignition switch off
0 to 1.5 V
B9-13 (GREL) - A19-2 (E1)
LG-R - W-B
GLOW relay
Ignition switch ON at cold engine
0 to 1.5 V
Idling with warm engine
11 to 14 V
A19-55 (VPA) - A19-57 (EPA)
LG-R - L-Y
Accelerator pedal position sensor (for engine control)
Ignition switch ON
Accelerator pedal fully released
0.6 to 1.0 V
Ignition switch ON
Accelerator pedal fully depressed
3.0 to 4.6 V
A19-52 (VPA2) - A19-54 (EPA2)
V-Y - V
Accelerator pedal position sensor (for sensor malfunction detection)
Ignition switch ON
Accelerator pedal fully released
1.4 to 1.8 V
Ignition switch ON
Accelerator pedal fully depressed
3.7 to 5.0 V
A19-56 (VCPA) - A19-57 (EPA)
R-L - L-Y
Power source of accelerator pedal position sensor (for VPA)
Ignition switch ON
4.5 to 5.0 V
A19-53 (VCP2) - A19-54 (EPA2)
P - V
Power source of accelerator pedal position sensor (for VPA2)
Ignition switch ON
4.5 to 5.0 V
A19-46 (VVLU) - A19-47 (EVLU)
W - R
Power source of diesel throttle position sensor
Ignition switch ON
4.5 to 5.0 V
A19-45 (VLU) - A19-47 (EVLU)
GR - R
Diesel throttle position sensor
Throttle valve fully opened
3.2 to 4.9 V
Throttle valve fully closed
0.5 to 1.1 V
A19-43 (M+) - A19-2 (E1)
P - W-B
Diesel throttle duty signal
Engine racing
Pulse generation
A19-42 (M-) - A19-2 (E1)
L - W-B
Diesel throttle duty signal
Engine racing
Pulse generation
A19-63 (H-) - A19-2 (E1)
LG-B - W-B
Air fuel ratio sensor heater
Ignition switch ON
11 to 14 V
Idling with warm engine
Pulse generation
(See waveform 1)
A19-69 (AF1+) - A19-2 (E1)
G - W-B
Air fuel ratio sensor signal
Ignition switch ON
1.5 to 4.9 V
A19-70 (AF1-) - A19-2 (E1)
B - W-B
Air fuel ratio sensor signal
Ignition switch ON
2.35 to 2.65 V
A19-68 (TR) - A19-2 (E1)
R - W-B
Air fuel ratio sensor signal
Ignition switch ON
1.5 to 4.9 V
A19-71 (RE) - A19-2 (E1)
W - W-B
Air fuel ratio sensor signal
Ignition switch ON
2.1 to 3.5 V
B9-29 (THF) - B9-28 (ETHF)
R - G
Fuel temperature sensor
Idling
0.5 to 2.0 V
B9-15 (VCS) - B9-14 (E2S)
LG - L
Power source of rail pressure sensor
Ignition switch ON
4.5 to 5.0 V
B9-16 (PC) - B9-14 (E2S)
R-W - L
Common rail pressure sensor
Idling
1.0 to 1.3 V
A19-11 (VG) - A19-12 (EVG)
V - L-W
Mass air flow meter
Idling
Pulse generation
A19-30 (THA) - A19-31 (ETHA)
P-G - B-W
Intake air temperature sensor
Idling, intake air temperature at 20°C (68°F)
0.5 to 2.0 V
B9-4 (PRV) - A19-2 (E1)
W-L - W-B
Pressure control valve signal
Drive vehicle at 50 km/h (31 mph) with third gear, and then decelerate by releasing accelerator pedal
Pulse generation
(See waveform 2)
B9-12 (PCV) - A19-2 (E1)
B-W - W-B
Supply pump
(Fuel metering unit)
Idling
Pulse generation
(See waveform 3)
B9-1 (IJ1+) - B9-21 (IJ1-)
W - Y
Injector
Idling
Pulse generation
B9-2 (IJ2+) - B9-30 (IJ2-)
R - R-Y
Injector
Idling
Pulse generation
B9-3 (IJ3+) - B9-31 (IJ3-)
P - G
Injector
Idling
Pulse generation
B9-20 (IJ4+) - B9-32 (IJ4-)
L - L-Y
Injector
Idling
Pulse generation
A19-50 (THCI) - A19-51 (ETCI)
B-Y - W-G
Exhaust gas temperature sensor B1S1
Idling with warm engine
2.9 to 3.3 V
A19-48 (THCO) - A19-49 (ETCO)
G-Y - V-R
Exhaust gas temperature sensor B1S1
Idling with warm engine
2.9 to 3.3 V
B9-40 (THW) - B9-39 (ETHW)
L - P
Engine coolant temperature sensor
Idling, engine coolant temperature at 80°C (176°F)
0.2 to 1.0 V
B9-8 (THIA) - B9-7 (ETHI)
V-W - G-W
Intake air temperature sensor (intake manifold)
Idling, intake air temperature at 0 to 80 °C (32 to 176°F)
0.5 to 2.0 V
A19-14 (VPIM) - A19-15 (EPIM)
GR-R - B-R
Power source of MAP sensor
Ignition switch ON
4.5 to 5.0 V
A19-13 (PIM) - A19-15 (EPIM)
V-G - B-R
Turbo pressure sensor
Ignition switch ON
(same as atmosphere pressure)
0.8 to 1.4 V
B9-19 (NE+) - B9-18 (NE-)
G - R
Crankshaft position sensor
Idling
Pulse generation
(See waveform 4)
B9-11 (G+) - B9-10 (G-)
R - W
Camshaft position sensor
Idling
Pulse generation
(See waveform 4)
B9-37 (VNVC) - B9-36 (VNE2)
V - P
Power source of VN turbocharger
Ignition switch ON
4.5 to 5.0 V
B9-38 (VTAI) - B9-36 (VNE2)
Y - P
Nozzle vane position sensor
VN turbocharger fully closed
0.9 to 2.1 V
VN turbocharger fully opened
3.0 to 4.1 V
B9-34 (M+) - A19-2 (E1)
W - W-B
VN turbocharger motor
Idling with warm engine
Pulse generation
B9-33 (M-) - A19-2 (E1)
B - W-B
VN turbocharger motor
Idling with warm engine
Pulse generation
A19-40 (ECBV) - A19-2 (E1)
W - W-B
VSV for EGR cooler bypass valve
Ignition switch ON at cold engine
0 to 1.5 V
Idling with warm engine
11 to 14 V
B9-26 (VCEG) - B9-25 (EEGL)
L - P
Power source of EGR valve
Ignition switch ON
4.5 to 5.0 V
B9-23 (EGM+) - A19-2 (E1)
V - W-B
EGR valve motor
Idling with warm engine
Pulse generation
B9-22 (EGM-) - A19-2 (E1)
LG - W-B
EGR valve motor
Idling with warm engine
Pulse generation
B9-27 (EGLS) - B9-25 (EEGL)
GR - P
EGR valve position sensor
EGR valve fully closed
0.8 to 1.6 V
EGR valve fully opened
3.6 to 4.4 V
A19-33 (VCPX) - A19-34 (EPEX)
B - Y
Power source of differential pressure sensor
Ignition switch ON
4.5 to 5.0 V
A19-32 (PEX) - A19-34 (EPEX)
V-W - Y
Differential pressure sensor
Ignition switch ON
0.5 to 1.0 V
A19-8 (CLSW) - A19-2 (E1)
L - W-B
Clutch pedal switch (upper)
Clutch pedal released
0 to 1.5 V
Clutch pedal depressed
11 to 14 V
A19-59 (OILH) - A19-2 (E1)
R-W - W-B
Engine oil level upper switch
Oil level upper switch off
3.3 to 4.5 V
Oil level upper switch ON
0 to 1.5 V
A19-6 (STA) - A19-2 (E1)
W-R - W-B
Starter signal
Cranking
6.0 V or more
A19-29 (STP) - A19-2 (E1)
Y - W-B
Stop light switch
Brake pedal depressed
7.5 to 14 V
Brake pedal released
0 to 1.5 V
A19-28 (ST1-) - A19-2 (E1)
R-L - W-B
Stop light switch
(opposite to STP)
Brake pedal depressed
0 to 1.5 V
Brake pedal released
7.5 to 14 V
A19-25 (SPD) - A19-2 (E1)
R-B - W-B
Speed signal from combination meter
Ignition switch ON driving wheel rotating slowly
Pulse generation
(See waveform 5)
A19-37 (W) - A19-2 (E1)
P-B - W-B
MIL
MIL illuminated
0 to 3 V
MIL not illuminated
11 to 14 V
A19-24 (TC) - A19-2 (E1)
R-G - W-B
Terminal TC of DLC3
Ignition switch ON
11 to 14 V
A19-79 (NEO) - A19-2 (E1)*1
V-W - W-B
Crankshaft position sensor
Engine idling
Pulse generation
(See waveform 6)
A19-21 (FANH) - A19-2 (E1)
G-R - W-B
Fan No. 1 relay
Ignition switch ON
11 to 14 V
Idling with warm engine
0 to 1.5 V
A19-20 (FANL) - A19-2 (E1)
LG - W-B
Fan No. 2 relay
Idling with high engine coolant temperature
0 to 1.5 V
A19-10 (ELS) - A19-2 (E1)
L-R - W-B
Electric load
Tail light switch ON
7.5 to 14 V
Tail light switch off
0 to 1.5 V
A19-27 (ELS2) - A19-2 (E1)
W-L - W-B
Electric load
Defogger switch ON
7.5 to 14 V
Defogger switch off
0 to 1.5 V
A19-26 (MHSW) - A19-2 (E1)*2
W - W-B
Power heater switch signal
Power heater switch ON
11 to 14 V
A19-9 (R) - A19-2 (E1)
R - W-B
Back-up light switch signal
Back-up light switch ON
11 to 14 V
B9-6 (ALT) - A19-2 (E1)
B-L - W-B
Generator (Alternator) duty ratio
Idling
Pulse generation
A19-3 (CANH) - A19-2 (E1)
L - W-B
CAN communication line
Ignition switch ON
Pulse generation
(See waveform 7)
A19-4 (CANL) - A19-2 (E1)
W - W-B
CAN communication line
Ignition switch ON
Pulse generation
(See waveform 8)
A19-17 (CAN+) - A19-2 (E1)
B - W-B
CAN communication line
Ignition switch ON
Pulse generation
(See waveform 7)
A19-16 (CAN-) - A19-2 (E1)
W - W-B
CAN communication line
Ignition switch ON
Pulse generation
(See waveform 8)
*1: w/ Entry and Start System only
*2: w/ Power Heater (Combustion Type)

Waveform 1
A208563E01
Air Fuel Ratio Sensor Heater 
ECM Terminal Name
H- and E1
Tester Range
5 v/DIV, 2 ms/DIV
Condition
Idling with warm engine

HINT:
The wavelength varies depending on the engine operating condition.


Waveform 2
A115980E04
Pressure Control Valve Signal 
ECM Terminal Name
PRV and E1
Tester Range
10 v/DIV, 0.5 ms/DIV
Condition
Drive vehicle at 50 km/h (31 mph) with third gear, and then decelerate by releasing accelerator pedal

HINT:
The waveform varies depending on the pressure control valve operation.


Waveform 3
A097624E09
Fuel Metering Unit Signal 
ECM Terminal Name
PCV and E1
Tester Range
10 v/DIV, 5 ms/DIV
Condition
Idling or cranking with warm engine

HINT:
The waveform varies depending on the suction control valve operation.


Waveform 4
A208562E05
Crankshaft Position Sensor and Camshaft Position Sensor Signal  
ECM Terminal Name
NE+ and NE-
G+ and G-
Tester Range
5 v/DIV, 10 ms/DIV
Condition
Idling

HINT:
The waveform varies depending on the engine speed.


Waveform 5
A098121E04
Vehicle Speed Signal 
ECM Terminal Name
SPD and E1
Tester Range
1 v/DIV, 10 ms/DIV
Condition
While driving vehicle

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


Waveform 6
D032445E09
Crankshaft Position Sensor Signal 
ECM Terminal Name
NEO and E1
Tester Range
5 v/DIV, 1 ms/DIV
Condition
Idling

HINT:
The waveform varies depending on the crankshaft position sensor signal.


Waveform 7
A129236E03
CAN Communication Signal (Reference) 
ECM Terminal Name
CANH and E1
CAN+ and E1
Tester Range
1 v/DIV, 10 μs/DIV
Condition
Engine stopped, ignition switch ON

HINT:
The wavelength becomes shorter depending on the CAN communication signal.


Waveform 8
A129237E03
CAN Communication Signal (Reference) 
ECM Terminal Name
CANL and E1
CAN- and E1
Tester Range
1 v/DIV, 10 μs/DIV
Condition
Engine stopped, ignition switch ON

HINT:
The wavelength becomes shorter depending on the CAN communication signal.