Nissan X-Trail 32. Manual — part 823
ENGINE CONTROL SYSTEM
EC-421
< SYMPTOM DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Main power supply and ground cir-
cuit
1
1
2
2
2
2
2
2
Engine coolant temperature sensor
circuit
3
3
3
Air fuel ratio (A/F) sensor 1 circuit
Throttle position sensor circuit
2
2
,
Accelerator pedal position sensor
circuit
3
2
1
Knock sensor circuit
2
3
Engine oil temperature sensor cir-
cuit
4
2
3
Crankshaft position sensor circuit
2
2
Camshaft position sensor (PHASE)
circuit
3
2
Vehicle speed signal circuit
2
3
3
3
ECM
2
2
3
3
3
3
3
3
3
3
3
Intake valve timing control solenoid
valve circuit
3
2
1
3
2
2
3
3
Exhaust valve timing control sole-
noid valve circuit
3
2
1
3
2
2
3
3
Exhaust valve timing control position
sensor circuit
5
5
5
5
5
5
5
5
M/T models: Reverse/neutral posi-
tion signal circuit
CVT models: Transmission range
switch
3
3
3
3
3
Refrigerant pressure sensor circuit
2
3
3
4
Electrical load signal circuit
3
SYMPTOM
Reference
page
HARD/NO S
T
A
R
T/RES
T
A
R
T (E
XCP
. HA)
E
N
GINE
ST
ALL
HES
IT
A
TION/SURGING/FLA
T
SPOT
S
P
ARK KNOC
K
/DET
O
NA
TI
ON
LACK OF
POWER/POOR ACCELERA
TION
HIG
H
IDL
E
/L
OW
ID
LE
ROUGH IDLE/HUNTING
ID
LING VI
BRA
T
ION
S
L
OW/NO RETU
RN
T
O
ID
LE
OVERHEA
T
S
/W
A
TER TEMPERA
T
URE HIG
H
E
X
CESSIVE
FUEL CON
S
UMP
T
ION
E
X
CESSIVE
OIL
C
O
NSUMP
T
ION
B
A
TTER
Y
DEAD (UNDER CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
AM
HA
EC-422
< SYMPTOM DIAGNOSIS >
[MR20DD]
ENGINE CONTROL SYSTEM
1 - 6: The numbers refer to the order of inspection.
(continued on next table)
SYSTEM — ENGINE MECHANICAL & OTHER
Air conditioner circuit
2
2
3
3
3
3
3
3
3
3
2
ABS actuator and electric unit (con-
trol unit)
4
SYMPTOM
Reference
page
HARD/NO S
T
A
R
T/RES
T
A
R
T (E
XCP
. HA)
E
N
GINE
ST
ALL
HES
IT
A
TION/SURGING/FLA
T
SPOT
S
P
ARK KNOC
K
/DET
O
NA
TI
ON
LACK OF
POWER/POOR ACCELERA
TION
HIG
H
IDL
E
/L
OW
ID
LE
ROUGH IDLE/HUNTING
ID
LING VI
BRA
T
ION
S
L
OW/NO RETU
RN
T
O
ID
LE
OVERHEA
T
S
/W
A
TER TEMPERA
T
URE HIG
H
E
X
CESSIVE
FUEL CON
S
UMP
T
ION
E
X
CESSIVE
OIL
C
O
NSUMP
T
ION
B
A
TTER
Y
DEAD (UNDER CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
AM
HA
SYMPTOM
Reference
page
HARD/NO ST
AR
T/REST
AR
T (EXCP
. HA)
ENGINE ST
A
L
L
HESIT
A
TIO
N
/SURG
IN
G/FLA
T
S
P
OT
SP
ARK K
N
OCK/
DET
O
NA
TION
LACK OF P
O
WER/POOR ACCELE
R
A
TIO
N
HIGH I
D
L
E
/L
OW IDL
E
ROUGH IDLE
/HUN
TING
IDL
ING VIB
R
A
T
IO
N
SLOW/NO RETURN T
O
IDLE
OVERHEA
T
S/W
A
TER TEMPERA
T
URE HIGH
EXCES
SIVE FUEL C
O
NSUMP
T
ION
EXCES
SIVE OI
L
CONSUMP
T
IO
N
BA
TTE
R
Y
DEA
D
(UND
E
R
CHARG
E
)
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
gasoline, Low octane)
—
ENGINE CONTROL SYSTEM
EC-423
< SYMPTOM DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Air
Air duct
5
5
5
5
5
5
Air cleaner
Air leakage from air
duct
(Mass air flow sensor
— electric throttle con-
trol 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
M/T models: Reverse/
neutral position signal
circuit
CVT models: Transmis-
sion range 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
SYMPTOM
Reference
page
HARD/NO S
T
A
R
T/RES
T
A
R
T (E
XCP
. HA)
E
N
GINE
ST
ALL
HES
IT
A
TION/SURGING/FLA
T
SPOT
S
P
ARK KNOC
K
/DET
O
NA
TI
ON
LACK OF
POWER/POOR ACCELERA
TION
HIG
H
IDL
E
/L
OW
ID
LE
ROUGH IDLE/HUNTING
ID
LING VI
BRA
T
ION
S
L
OW/NO RETU
RN
T
O
ID
LE
OVERHEA
T
S
/W
A
TER TEMPERA
T
URE HIG
H
E
X
CESSIVE
FUEL CON
S
UMP
T
ION
E
X
CESSIVE
OIL
C
O
NSUMP
T
ION
B
A
TTER
Y
DEAD (UNDER CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
AM
HA
EC-424
< SYMPTOM DIAGNOSIS >
[MR20DD]
ENGINE CONTROL SYSTEM
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 con-
trol
Exhaust valve timing
control
Intake valve
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 gal-
lery/Oil cooler
5
5
5
5
5
5
5
5
,
Oil level (Low)/Filthy oil
Cooling
Radiator/Hose/Radia-
tor filler cap
5
5
5
5
5
5
5
4
5
,
Thermostat
5
Water pump
Water gallery
Cooling fan
5
Coolant level (Low)/
Contaminated coolant
SYMPTOM
Reference
page
HARD/NO S
T
A
R
T/RES
T
A
R
T (E
XCP
. HA)
E
N
GINE
ST
ALL
HES
IT
A
TION/SURGING/FLA
T
SPOT
S
P
ARK KNOC
K
/DET
O
NA
TI
ON
LACK OF
POWER/POOR ACCELERA
TION
HIG
H
IDL
E
/L
OW
ID
LE
ROUGH IDLE/HUNTING
ID
LING VI
BRA
T
ION
S
L
OW/NO RETU
RN
T
O
ID
LE
OVERHEA
T
S
/W
A
TER TEMPERA
T
URE HIG
H
E
X
CESSIVE
FUEL CON
S
UMP
T
ION
E
X
CESSIVE
OIL
C
O
NSUMP
T
ION
B
A
TTER
Y
DEAD (UNDER CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
AM
HA
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