Nissan Pathfinder (2011 year). Manual — part 360
EC-934
< SYMPTOM DIAGNOSIS >
[VK56DE]
ENGINE CONTROL SYSTEM SYMPTOMS
1 - 6: The numbers refer to the order of inspection.
(continued on next table)
SYSTEM — ENGINE MECHANICAL & OTHER
Mass air flow sensor circuit
1
1
2
2
2
2
2
2
Engine coolant temperature sensor circuit
3
3
3
Air fuel ratio (A/F) sensor 1 circuit
EC-665
EC-669
EC-673
EC-677
EC-897
Throttle position sensor circuit
2
2
EC-653
EC-718
EC-837
EC-839
EC-889
Accelerator pedal position sensor circuit
3
2
1
Knock sensor circuit
2
3
Crankshaft position sensor (POS) circuit
2
2
Camshaft position sensor (PHASE) circuit
3
2
Vehicle speed signal circuit
2
3
3
3
Power steering pressure sensor circuit
2
3
3
ECM
2
2
3
3
3
3
3
3
3
3
3
Intake valve timing control solenoid valve cir-
cuit
3
2
1
3
2
2
3
3
Park/neutral position (PNP) signal circuit
3
3
3
3
3
Refrigerant pressure sensor circuit
2
3
3
4
Electrical load signal circuit
3
Air conditioner circuit
2
2
3
3
3
3
3
3
3
3
2
or
ABS actuator and electric unit (control unit)
4
SYMPTOM
Refer-
ence page
HARD/NO S
TA
R
T/RES
TA
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
LOW/NO RETU
RN
T
O ID
LE
OVERHEA
T
S
/W
A
TER TEMPERA
T
URE HIG
H
E
XCESSIVE
FUEL CON
S
UMP
T
ION
E
XCESSIVE
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
2011 Pathfinder
ENGINE CONTROL SYSTEM SYMPTOMS
EC-935
< SYMPTOM DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
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EC
N
P
O
SYMPTOM
Reference
page
HARD/NO ST
AR
T/REST
AR
T (EXCP
.
HA)
E
N
GI
N
E
ST
AL
L
HESIT
A
TION/S
U
R
GING/F
LA
T SP
OT
SP
ARK KNOCK/DE
T
O
NA
TION
LACK OF POWE
R/POOR
ACCELERA
TIO
N
HIGH IDL
E/L
OW
IDL
E
ROUG
H IDLE/HU
NTING
IDL
ING VIBRA
T
ION
SLO
W
/NO RETURN T
O
IDLE
OVERHEA
T
S/W
A
TE
R
TEMPERA
T
URE
HIGH
EXCES
SIVE F
U
EL CONSUMP
T
ION
EXCES
SIVE OI
L CONSUMP
T
IO
N
BA
TTE
R
Y
DEAD (UN
D
E
R
CH
A
R
GE)
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)
—
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
Park/neutral position (PNP) sig-
nal
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
2011 Pathfinder
EC-936
< SYMPTOM DIAGNOSIS >
[VK56DE]
ENGINE CONTROL SYSTEM SYMPTOMS
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)/Contaminat-
ed coolant
5
NVIS (NISSAN Vehicle Immobilizer System —
NATS)
1
1
or
SYMPTOM
Reference
page
HARD/NO S
TA
R
T/RES
TA
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
LOW/NO RETU
RN
T
O ID
LE
OVERHEA
T
S
/W
A
TER TEMPERA
T
URE HIG
H
E
XCESSIVE
FUEL CON
S
UMP
T
ION
E
XCESSIVE
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
2011 Pathfinder
NORMAL OPERATING CONDITION
EC-937
< SYMPTOM DIAGNOSIS >
[VK56DE]
C
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N
P
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NORMAL OPERATING CONDITION
Fuel Cut Control (at No Load and High Engine Speed)
INFOID:0000000006244634
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM via the CAN communication line.
SYSTEM DESCRIPTION
If the engine speed is above 2,400 rpm under no load (for example, the selector lever position is neutral and
engine speed over is 2,400 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off var-
ies based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,000 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration control listed under
.
Sensor
Input signal to ECM
ECM function
Actuator
Accelerator pedal position sensor
Accelerator pedal position
Fuel cut control Fuel injector
Engine coolant temperature sensor
Engine coolant temperature
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Unified meter control unit
Neutral position
Vehicle speed*
2011 Pathfinder
EC-938
< PERIODIC MAINTENANCE >
[VK56DE]
FUEL PRESSURE
PERIODIC MAINTENANCE
FUEL PRESSURE
Fuel Pressure Check
INFOID:0000000006244640
FUEL PRESSURE RELEASE
With CONSULT-III
1. Turn ignition switch ON.
2. Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode with CONSULT-III.
3. Start engine.
4. After engine stalls, crank it 2 or 3 times to release all fuel pressure.
5. Turn ignition switch OFF.
Without CONSULT-III
1. Remove fuel pump fuse (1) located in IPDM E/R (2).
2. Start engine.
3. After engine stalls, crank it 2 or 3 times to release all fuel pres-
sure.
4. Turn ignition switch OFF.
5. Reinstall fuel pump fuse after servicing fuel system.
FUEL PRESSURE CHECK
CAUTION:
• Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
• Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the quick
connector o-ring maintains seal ability.
• Use Fuel Pressure Gauge Kit [SST (J-44321)] and Fuel Pressure Adapter [SST (J-44321-6)] to check
fuel pressure.
• Never perform fuel pressure check with electrical system operating (i.e. lights, rear window defog-
ger, A/C, etc.). Fuel pressure gauge may indicate false readings due to varying engine loads and
changes in manifold vacuum.
NOTE:
Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-
sure cannot be completely released because R51 models do not have fuel return system.
1. Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".
2. Remove engine cover.
3. Remove fuel hose using Quick Connector Release [SST (J-45488)]. Refer to
.
• Never twist or kink fuel hose because it is plastic hose.
• Never remove fuel hose from quick connector.
• Keep fuel hose connections clean.
4. Install Fuel Pressure Adapter [SST (J-44321-6)] and Fuel Pres-
sure Gauge [SST (J-44321)] (1) as shown in the figure.
• Never distort or bend fuel rail tube when installing fuel pres-
sure gauge adapter.
• When reconnecting fuel hose, check the original fuel hose for
damage and abnormality.
5. Turn ignition switch ON (reactivate fuel pump), and check for
fuel leakage.
6. Start engine and check for fuel leakage.
7. Read the indication of fuel pressure gauge.
ALBIA0351ZZ
ALBIA0367ZZ
2011 Pathfinder
FUEL PRESSURE
EC-939
< PERIODIC MAINTENANCE >
[VK56DE]
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• During fuel pressure check, check for fuel leakage from fuel connection every 3 minutes.
8. If result is unsatisfactory, go to next step.
9. Check the following.
• Fuel hoses and fuel tubes for clogging
• Fuel filter for clogging
• Fuel pump
• Fuel pressure regulator for clogging
If OK, replace fuel pressure regulator. Refer to
.
If NG, repair or replace malfunctioning part.
10. Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter [SST (J-44321-6)], release fuel
pressure to zero. Refer to "FUEL PRESSURE RELEASE".
At idling: Approximately 350 kPa (3.57 kg/cm
2
, 51 psi)
2011 Pathfinder
EC-940
< PERIODIC MAINTENANCE >
[VK56DE]
EVAP LEAK CHECK
EVAP LEAK CHECK
How to Detect EVAP Leakage
INFOID:0000000006244641
CAUTION:
• Never use compressed air or a high pressure pump.
• Never exceed 4.12 kPa (0.042 kg/cm
2
, 0.6 psi) of pressure in EVAP system.
NOTE:
• Never start engine.
• Improper installation of EVAP service port adapter (commercial service tool) to the EVAP service port may
cause a leak.
WITH CONSULT-III
1. Attach the EVAP service port adapter (commercial service tool)
securely to the EVAP service port.
-
EVAP canister purge volume control solenoid valve (1)
-
: Vehicle front
2. Also attach the pressure pump and hose to the EVAP service
port adapter (commercial service tool).
3. Turn ignition switch ON.
4. Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT
MODE” with CONSULT-III.
5. Touch “START”. A bar graph (Pressure indicating display) will
appear on the screen.
6. Apply positive pressure to the EVAP system until the pressure
indicator reaches the middle of the bar graph.
7. Remove EVAP service port adapter (commercial service tool)
and hose with pressure pump. Refer to
.
8. Locate the leak using a leak detector (commercial service tool).
WITHOUT CONSULT-III
ALBIA0349ZZ
SEF462UA
SEF200U
2011 Pathfinder
EVAP LEAK CHECK
EC-941
< PERIODIC MAINTENANCE >
[VK56DE]
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1. Attach the EVAP service port adapter (commercial service tool)
securely to the EVAP service port (2).
-
EVAP canister purge volume control solenoid valve (1)
-
: Vehicle front
2. Also attach the pressure pump with pressure gauge to the EVAP
service port adapter (commercial service tool).
3. Apply battery voltage between the terminals of EVAP canister
vent control valve (3) to make a closed EVAP system.
-
Fuel filler pipe (top of frame view) (1)
-
EVAP control system pressure sensor (2)
-
EVAP canister (4)
-
Drain filter (5)
-
: Vehicle front
4. To locate the leak, deliver positive pressure to the EVAP system
until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to
0.028 kg/cm
2
, 0.2 to 0.4 psi).
5. Remove EVAP service port adapter (commercial service tool)
and hose with pressure pump. Refer to
.
6. Locate the leak using a leak detector (commercial service tool). Refer to
.
ALBIA0349ZZ
SEF462UA
AWBIA0134ZZ
2011 Pathfinder
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