Infiniti Q45 (FY33). Manual — part 251
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SEF454U
SEF455U
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK THE OVERALL FUNCTION.
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between ECM terminal
q
72
,
q
79
and ground in the following con-
ditions.
NG(*1)
NG(*2)
E
OK
INSPECTION END
q
A
(Go to next page.)
CHECK REAR WINDOW DEFOGGER
FUNCTION.
1. Start engine.
2. Turn “ON” the rear defogger switch.
3. Check the rear windshield. Is the rear
windshield heated up?
OK
E
NG
Refer to EL section (RR
window defogger).
CHECK INPUT SIGNAL CIRCUIT FOR
RR/DEF.
Check harness continuity between ECM
terminal
q
79
and terminal
q
5
.
Continuity should exist.
If OK, check harness for short to ground
and short to power.
OK
E
NG
Check the following.
I
Harness connectors
F63
,
M49
I
Joint connector-10
M60
I
Harness connectors
M4
,
B3
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
Conditions
ECM
terminal
No.
Voltage (V)
Rear window defogger
switch “ON”*1
q
79
Battery volt-
age
Headlamp “ON” at 2nd
position with low
beam*2
q
72
Except the above*1
0
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Electrical Load Signal (Cont’d)
H
H
H
H
H
H
EC-533
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SEF807W
q
A
CHECK HEADLAMP FUNCTION.
1. Start engine.
2. Turn the headlamp switch “ON” (2nd
position with low beam).
3. Check that headlamps are illuminated.
OK
E
NG
Refer to EL section
(HEADLAMP).
CHECK INPUT SIGNAL CIRCUIT FOR
HEADLAMP.
Check harness continuity between ECM
terminal
q
72
and terminal
q
6
(HEADLAMP
RELAY), or
q
7
(HID RELAY).
Continuity should exist.
If OK, check harness for short to ground
and short to power.
OK
E
NG
Check the following.
I
Harness connectors
F1
,
E14
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Electrical Load Signal (Cont’d)
H
H
H
H
EC-534
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MIL & Data Link Connectors
TEC080M
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
EC-535
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General Specifications
PRESSURE REGULATOR
Fuel pressure
kPa (kg/cm
2
, psi)
At idle
Approximately
235 (2.4, 34)
A few seconds after ignition
switch is turned OFF to ON
Approximately
294 (3.0, 43)
Inspection and Adjustment
Target idle speed*1
rpm
No-load*3
650±50
(in “P” or “N” position)
Base idle speed*2
rpm
No-load*3
600±50
(in “P” or “N” position)
Air conditioner: ON
(in “N” position)
More than 700 rpm
Ignition timing
15°±2° BTDC
*1: TPS harness connector connected.
*2: Using CONSULT-II “WORK SUPPORT” or TPS harness connector
disconnected.
*3: Under the following conditions:
I
Air conditioner switch: OFF
I
Electric load: OFF (Lights, heater, fan & rear defogger)
MASS AIR FLOW SENSOR
Supply voltage
V
Battery voltage (11 - 14)
Output voltage
V
1.0 - 1.7 at idle*
Approximately 2.1 at 2,500
Mass air flow
(Using CONSULT-II or GST)
g
⋅
m/sec
3.0 - 6.0 at idle*
12.9 - 25.3 at 2,500 rpm*
*: Engine is warmed up sufficiently and idling under no-load.
ENGINE COOLANT TEMPERATURE
SENSOR
Temperature °C (°F)
Resistance (k
Ω
)
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
EGR TEMPERATURE SENSOR
EGR temperature
°C (°F)
Voltage
(V)
Resistance
(M
Ω
)
0 (32)
4.61
0.68 - 1.11
50 (122)
2.53
0.09 - 0.12
100 (212)
0.87
0.017 - 0.024
HEATED OXYGEN SENSOR 1 HEATER
(FRONT)
Resistance [at 25°C (77°F)]
Ω
2.3 - 4.3
HEATED OXYGEN SENSOR 2 HEATER
(REAR)
Resistance [at 25°C (77°F)]
Ω
2.3 - 4.3
FUEL PUMP
Resistance [at 25°C (77°F)]
Ω
0.2 - 5.0
IACV-AAC VALVE (Step motor type)
Resistance [at 25°C (77°F)]
Ω
Approximately 30
INJECTOR
Resistance [at 25°C (77°F)]
Ω
10 - 14
THROTTLE POSITION SENSOR
Accelerator pedal conditions
Voltage*
Completely released (a)
0.15 - 0.85
Partially released
Between (a) and (b)
Completely depressed (b)
3.5 - 4.7
*: Measured with vacuum applied to the throttle opener using a
vacuum pump.
CALCULATED LOAD VALUE
Calculated load value %
(Using CONSULT-II or GST)
At idle
13.0 - 32
At 2,500 rpm
13.0 - 25.5
INTAKE AIR TEMPERATURE SENSOR
Temperature °C (°F)
Resistance
20 (68)
2.1 - 2.9 k
Ω
80 (176)
0.68 - 1.00 k
Ω
SERVICE DATA AND SPECIFICATIONS (SDS)
EC-536
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