Infiniti Q45 (FY33). Manual — part 146
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
66
L
Secondary throttle posi-
tion sensor
Ignition switch “ON”
Approximately 3 seconds after ignition switch
“ON” and thereafter
Approximately 3.4V
Ignition switch “ON”
Disconnect throttle motor harness connector.
Fully close secondary throttle valve by hand.
Approximately 0.4V
67
Y/B
Engine coolant tempera-
ture sensor
Engine is running.
0 - 4.8V
Output voltage varies with
engine coolant tempera-
ture.
68
P/L
Vehicle speed sensor
Engine is running.
Jack up rear wheels and run engine at idle in
“D” position.
Approximately 5.2V
SEF542T
69
W/PU
Intake air temperature
sensor
Engine is running.
0 - 4.8V
Output voltage varies with
intake air temperature.
70
71
R/L
L/W
Intake valve timing control
position sensor (right
bank)
Intake valve timing control
position sensor (left bank)
Engine is running.
Idle speed
Approximately 0V
SEF551T
Engine is running.
Engine speed is 2,000 rpm.
Approximately 0V
SEF552T
72
R/Y
Headlamp switch
Engine is running.
Headlamp switch is “OFF”.
0V
Engine is running.
Headlamp switch is “ON”.
Battery voltage
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS — General Description
ECM Terminals and Reference Value (Cont’d)
EC-113
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
73
R
TCS signal
Ignition switch “ON”
Approximately 5V
Ignition switch “ON”
Disconnect throttle motor harness connector.
Fully close secondary throttle valve by hand.
Approximately 0V
74
GY/L
Closed throttle position
switch
Ignition switch “ON” (Warmed-up condition)*
Accelerator pedal released
BATTERY VOLTAGE
(11 - 14V)
Ignition switch “ON” (Warmed-up condition)
Accelerator pedal depressed
Approximately 0V
75
W
EGR temperature sensor
Engine is running. (Warmed-up condition)
Idle speed
Less than 4.5V
Engine is running. (Warmed-up condition)
EGR system is operating.
0 - 1.0V
76
L/R
Ambient air temperature
switch
Engine is running.
Ambient air temperature is more than 23.5°C
(74°C)
Approximately 5V
Engine is running.
Ambient air temperature is less than 20.5°C
(69°F)
0V
78
W
Ignition switch
Ignition switch “OFF”
0V
Ignition switch “ON”
BATTERY VOLTAGE
(11 - 14V)
79
L/R
Electrical load signal
Engine is running.
Rear window defogger switch is “OFF”.
Headlamp switch is “OFF”.
0V
Engine is running.
Rear window defogger switch is “ON”.
Headlamp switch is “ON”.
Battery voltage
80
SB
Start signal
Ignition switch “ON”
Approximately 0V
Ignition switch “START”
BATTERY VOLTAGE
(11 - 14V)
81
G/B
Air conditioner pressure
switch
Engine is running.
At idle speed
Approximately 5V
82
83
R
W
Heated oxygen sensor 1
(front) (bank 2)
Heated oxygen sensor 1
(front) (bank 1)
Engine is running.
After warming up to normal operating tem-
perature and engine speed is 2,000 rpm.
0 - Approximately 1.0V
(periodically change)
89
90
W
Y
Heated oxygen sensor 2
(rear) (bank 2)
Heated oxygen sensor 2
(rear) (bank 1)
Engine is running.
After warming up to normal operating tem-
perature and engine speed is 2,000 rpm.
0 - Approximately 1.0V
*: More than −40.0 kPa (−300 mmHg, −11.81 inHg) of vacuum is applied to the throttle opener with a handy vacuum pump.
TROUBLE DIAGNOSIS — General Description
ECM Terminals and Reference Value (Cont’d)
EC-114
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
91
R/L
Fuel tank temperature
sensor
Engine is running.
Approximately 0 - 4.8V
Output voltage varies with
fuel temperature.
92
LG
EVAP control system
pressure sensor
Ignition switch “ON”
Approximately 3.4V
93
G/R
Fuel pump control module
(FPCM) check
When cranking the engine
Approximately 0V
After starting the engine
Approximately 5V
98
BR/W
Sensor’s power supply
Ignition switch “ON”
Approximately 5V
99
R/L
A/T communication line
(LAN)
Engine is running.
Idle speed
Approximately 2V
100
G
Power steering oil pres-
sure switch
Engine is running.
Steering wheel is being turned.
0 - 1.5V
Engine is running.
Steering wheel is not being turned.
BATTERY VOLTAGE
(11 - 14V)
101
G/OR
PNP switch
Ignition switch “ON”
Gear position is “N” or “P”.
Approximately 0V
Ignition switch “ON”
Except the above gear position
Approximately 5V
105
108
W
W
Knock sensor (LH)
Knock sensor (RH)
Engine is running.
Idle speed
2.0 - 3.0V
106
R
Data link connector
Ignition switch “ON”
CONSULT-II or GST is disconnected.
6 - 10V
121
122
B
B
ECM ground
Engine is running.
Idle speed
Engine ground
123
W
Current return
Engine is running.
Idle speed
BATTERY VOLTAGE
(11 - 14V)
124
W/B
ECM relay (Self-shutoff)
Engine is running.
Ignition switch “OFF”
For a few seconds after turning ignition switch
“OFF”
0 - 1V
Ignition switch “OFF”
A few seconds passed after turning ignition
switch “OFF”
BATTERY VOLTAGE
(11 - 14V)
125
126
B
ECM ground
Engine is running.
Idle speed
Engine ground
127
128
B
ECM ground
Engine is running.
Idle speed
Engine ground
129
B
Sensor’s ground
Engine is running. (Warmed-up condition)
Idle speed
0V
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS — General Description
ECM Terminals and Reference Value (Cont’d)
EC-115
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
130
131
R/G
Power supply for ECM
Ignition switch “ON”
BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS — General Description
ECM Terminals and Reference Value (Cont’d)
EC-116
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