Infiniti M35/M45 Y50. Manual — part 407
TROUBLE DIAGNOSIS
EC-101
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
SYSTEM — ENGINE MECHANICAL & OTHER
SYMPTOM
Reference
page
HARD/
NO ST
AR
T/
REST
AR
T (
E
X
C
P
. HA)
ENGI
NE ST
ALL
HESIT
A
TION/SURG
ING/FL
A
T S
P
OT
SP
ARK K
N
O
C
K/DET
O
NA
TI
ON
L
A
CK
OF P
O
W
E
R/POOR ACCEL
E
R
A
TION
HI
GH ID
L
E
/L
OW
I
D
L
E
ROUGH IDL
E
/HUNTI
N
G
ID
L
ING VI
B
R
A
T
ION
SL
OW
/N
O RETURN
T
O
I
D
L
E
OVERHEA
T
S/W
A
T
E
R TEMPERA
T
URE
HI
GH
EXCESSIVE FUEL CO
NSUM
P
T
ION
EXCESSIVE O
IL CONSUM
P
T
IO
N
BA
TTER
Y
DEA
D
(UNDER CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
AM
HA
Fuel
Fuel tank
5
5
Fuel piping
5
5
5
5
5
5
Vapor lock
—
Valve deposit
5
5
5
5
5
5
5
—
Poor fuel (Heavy weight gaso-
line, Low octane)
—
Air
Air duct
5
5
5
5
5
5
Air cleaner
Air leakage from air duct
(Mass air flow sensor — electric
throttle control actuator)
5
5
5
5
Electric throttle control actuator
Air leakage from intake manifold/
Collector/Gasket
Cranking
Battery
1
1
1
1
1
1
1
1
Generator circuit
Starter circuit
3
Signal plate
6
PNP switch
4
Engine
Cylinder head
5
5
5
5
5
5
5
5
Cylinder head gasket
4
3
Cylinder block
6
6
6
6
6
6
6
6
4
Piston
Piston ring
Connecting rod
Bearing
Crankshaft
Valve
mecha-
nism
Timing chain
5
5
5
5
5
5
5
5
Camshaft
Intake valve timing control
Intake valve
3
Exhaust valve
EC-102
[VQ35DE]
TROUBLE DIAGNOSIS
1 - 6: The numbers refer to the order of inspection.
Exhaust
Exhaust manifold/Tube/Muffler/
Gasket
5
5
5
5
5
5
5
5
,
Three way catalyst
Lubrica-
tion
Oil pan/Oil strainer/Oil pump/Oil
filter/Oil gallery/Oil cooler
5
5
5
5
5
5
5
5
,
Oil level (Low)/Filthy oil
Cooling
Radiator/Hose/Radiator filler cap
5
5
5
5
5
5
5
4
5
,
Thermostat
5
Water pump
Water gallery
Cooling fan
5
Coolant level (Low)/Contami-
nated coolant
IVIS (INFINITI Vehicle Immobilizer System —
NATS)
1
1
SYMPTOM
Reference
page
HARD/
NO ST
AR
T
/REST
AR
T (
EXCP
. H
A
)
ENGI
NE ST
ALL
HESI
T
A
TION/
S
URGING/
FL
A
T
SPOT
SP
ARK KNOCK/DET
O
NA
TI
ON
L
A
CK OF
POW
E
R/POO
R
ACCEL
E
RA
TION
HI
GH I
D
L
E
/L
OW
I
D
L
E
ROUG
H IDL
E
/HUNTING
ID
L
ING VI
BRA
T
ION
SL
OW
/N
O RETURN
T
O
I
D
L
E
OVERHEA
T
S/
W
A
TER TEMPERA
T
URE HI
GH
EXCESSIVE F
U
E
L
CONSUM
P
T
IO
N
EXCESSIVE OIL
CONSUM
P
T
ION
BA
TTER
Y
DEAD (
UNDER CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
AM
HA
TROUBLE DIAGNOSIS
EC-103
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Engine Control Component Parts Location
NBS004T2
1.
IPDM E/R
2.
ICC brake hold relay
(ICC models only)
3.
Battery current sensor
4.
Cooling fan relay
5.
Power steering pressure sensor
6.
Refrigerant pressure sensor
7.
Intake valve timing control solenoid
valve (bank 1)
8.
Cooling fan motor-2
9.
Cooling fan control module
10. Intake valve timing control solenoid
valve (bank 2)
11.
Cooling fan motor-1
12. Mass air flow sensor
(with built in intake air temperature
sensor)
13. Ignition coil (with power transistor)
and spark plug (bank 2)
14. Camshaft position sensor (PHASE)
(Bank 2)
15. Electric throttle control actuator
(with built in throttle position sensor,
throttle control motor)
16. Fuel injector (bank 2)
17. Knock sensor
18. Fuel injector (bank 1)
19. EVAP canister purge volume con-
trol solenoid valve
20. Camshaft position sensor (PHASE)
(Bank 1)
21. Engine coolant temperature sensor
22. Ignition coil (with power transistor)
and spark plug (bank 1)
23. EVAP service port
PBIB2781E
EC-104
[VQ35DE]
TROUBLE DIAGNOSIS
: Vehicle front
1.
Mass air flow sensor
(with built in intake air temperature
sensor)
2.
Electric throttle control actuator
(with built in throttle position sensor,
throttle control motor)
3.
Cooling fan motor-1
4.
Cooling fan motor-2
5.
Cooling fan control module
6.
Refrigerant pressure sensor har-
ness connector
7.
PCV valve
8.
Engine coolant temperature sensor
harness connector
9.
Fuel dumper
PBIB3351E
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