Infiniti QX4 (R50). Manual — part 166
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
42
B/Y
Start signal
[Ignition switch “ON”]
Approximately 0V
[Ignition switch “START”]
9 - 12V
43
R
Ignition switch
[Ignition switch “OFF”]
0V
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
44
L
PNP switch
[Ignition switch “ON”]
I
Gear position is “P” or “N”.
Approximately 0V
[Ignition switch “ON”]
I
Except the above gear position
BATTERY VOLTAGE
(11 - 14V)
45
B/R
Air conditioner switch
signal
[Engine is running]
I
Both A/C switch and blower switch are “ON”.
Approximately 0V
[Engine is running]
I
A/C switch is “OFF”.
Approximately 5V
47
R/B
Power steering oil
pressure switch
[Engine is running]
I
Steering wheel is being turned.
0 - 1.0V
[Engine is running]
I
Steering wheel is not being turned.
Approximately 5V
48
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
51
BR
A/C cut signal
[Engine is running]
I
Air conditioner is operating.
0 - 0.5V
52
PU
Electrical load signal
[Engine is running]
I
Rear window defogger: ON
I
Hi-beam headlamp: ON
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Electrical load: OFF
0V
55
W/B
Swirl control valve con-
trol vacuum check
switch
[Engine is running]
I
Idle speed
I
Engine coolant temperature is between 15 to
50°C (59 to 122°F).
Approximately 5V
[Engine is running]
I
Idle speed
I
Engine coolant temperature is above 55°C
(131°F).
0 - 1.0V
56
OR/L
Throttle position switch
(Closed position)
[Engine is running]
I
Accelerator pedal fully released
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Accelerator pedal depressed
Approximately 0V
57
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
58
B/P
Sensors’ ground
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0V
59
B
Fuel level sensor
ground
[Engine is running]
I
Idle speed
Approximately 0V
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-131
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
61
OR
Mass air flow sensor
[Engine is running]
I
Warm-up condition
I
Idle speed
1.2 - 1.8V
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,500 rpm.
1.6 - 2.2V
62
G/B
Heated oxygen sensor
1 (front) (bank 2)
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
0 - Approximately 1.0V (Peri-
odically change)
SEF059V
63
G
Heated oxygen sensor
1 (front) (bank 1)
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
0 - Approximately 1.0V (Peri-
odically change)
SEF059V
64
Y/PU
Intake air temperature
sensor
[Engine is running]
Approximately 0 - 4.8V
Output voltage varies with
intake air temperature.
65
75
LG
LG
Crankshaft position
sensor (REF)
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 2.3V
★
(AC voltage)
SEF581X
66
76
L
L
Camshaft position sen-
sor (PHASE)
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 4.2V
★
(AC voltage)
SEF582X
12
67
W/R
Power supply for ECM
(Buck-up)
[Ignition switch “OFF”]
BATTERY VOLTAGE
(11 - 14V)
70
LG/R
Engine coolant tem-
perature sensor
[Engine is running]
Approximately 0 - 4.8V
Output voltage varies with
engine coolant temperature.
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-132
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
71
OR/L
Heated oxygen sensor
2 (rear) (bank 2)
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
0 - Approximately 1.0V
72
OR
Heated oxygen sensor
2 (rear) (bank 1)
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
0 - Approximately 1.0V
73
B/P
Mass air flow sensor
ground
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0V
79
Y/G
Intake valve timing
control position sen-
sors (RH)
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0.5V
SEF351Z
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
Approximatley 0.5V
SEF352Z
80
L/R
Absolute pressure sen-
sor
[Ignition switch “ON”]
Approximately 4.4V
81
W/PU
Refrigerant pressure
sensor
[Engine is running]
I
Warm-up condition
I
Both A/C switch and blower switch are “ON”.
(Compressor operates.)
0.36 - 3.88V
82
W
Throttle position sensor
signal output
[Engine is running]
I
Warm-up condition
I
Accelerator pedal fully released
Approximately 0.4V
[Ignition switch “ON”]
I
Accelerator pedal fully depressed
Approximately 4V
83
Y/PU
Fuel level sensor
[Ignition switch “ON”]
Approximately 0 - 4.8V
Output voltage varies with
fuel level.
84
L/G
EVAP control system
pressure sensor
[Ignition switch “ON”]
Approximately 3.4V
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-133
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
85
Y
Crankshaft position
sensor (POS)
[Engine is running]
I
Idle speed
Approximately 2.4V
SEF057V
[Engine is running]
I
Engine speed is 2,000 rpm.
Approximately 2.3V
SEF058V
86
W/L
Vehicle speed sensor
[Engine is running]
I
Jack up front wheels.
I
In 1st gear position
I
10 km/h (6 MPH)
Approximately 2.5V
SEF583X
[Engine is running]
I
Jack up front wheels.
I
In 2nd gear position
I
30 km/h (19 MPH)
Approximately 2.0V
SEF584X
89
OR
Intake valve timing
control position sen-
sors (LH)
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximatley 0.5V
SEF351Z
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
Approximatley 0.5V
SEF352Z
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-134
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