Infiniti F50. Manual — part 362
TROUBLE DIAGNOSIS
EC-89
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
ONA
T
IO
N
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
NG
ID
L
ING VI
B
R
A
T
ION
SL
OW
/N
O RETURN
T
O
I
D
L
E
OVERHEA
TS/W
A
T
ER TEMPERA
TURE
HI
GH
EXCESSIVE FUEL CO
NSUMP
T
ION
EXCESSIVE O
IL CONSUMP
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,
Throttle wire
Air leakage from intake manifold/
Collector/Gasket
Cranking
Battery
1
1
1
1
1
1
1
1
Generator circuit
Starter circuit
3
Drive 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
EC-90
TROUBLE DIAGNOSIS
1 - 6: The numbers refer to the order of inspection.
Valve
mecha-
nism
Timing chain
5
5
5
5
5
5
5
5
Camshaft
Intake valve timing control
Intake valve
5
5
5
5
5
5
5
5
3
Exhaust valve
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/
SURGING/
FL
A
T
SPOT
SP
ARK KNOCK/DET
ONA
T
IO
N
L
A
CK OF
POW
ER/POO
R ACCEL
ERA
TION
HI
GH I
D
L
E
/L
OW
I
D
L
E
ROUG
H IDL
E/
HUNTING
ID
L
ING VI
BRA
TION
SL
OW
/N
O RETURN
T
O
I
D
L
E
OVERHEA
TS/
W
A
TER TEMPERA
TURE HI
GH
EXCESSIVE F
U
E
L
CONSUMP
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-91
C
D
E
F
G
H
I
J
K
L
M
A
EC
Engine Control Component Parts Location
EBS00LW0
PBIB1244E
EC-92
TROUBLE DIAGNOSIS
PBIB1258E
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