Nissan Pathfinder (2010 year). Manual — part 357
EC-948
< 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
Throttle position sensor circuit
2
2
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
2010 Pathfinder
ENGINE CONTROL SYSTEM SYMPTOMS
EC-949
< SYMPTOM DIAGNOSIS >
[VK56DE]
C
D
E
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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
2010 Pathfinder
EC-950
< 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
2010 Pathfinder
NORMAL OPERATING CONDITION
EC-951
< SYMPTOM DIAGNOSIS >
[VK56DE]
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NORMAL OPERATING CONDITION
Fuel Cut Control (at No Load and High Engine Speed)
INFOID:0000000005257922
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*
2010 Pathfinder
EC-952
< PRECAUTION >
[VK56DE]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005257923
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SRS section.
• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-
vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.
On Board Diagnosis (OBD) System of Engine and A/T
INFOID:0000000005257924
The ECM has an on board diagnostic system. It will illuminate the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
• Always turn the ignition switch OFF and disconnect the negative battery cable before any repair or
inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will cause
the MIL to illuminate.
• Always connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to illuminate due to the open circuit. (Check that the connector is free from water,
grease, dirt, bent terminals, etc.)
• Certain systems and components, especially those related to OBD, may use a new style slide-lock-
ing type harness connector. For description and how to disconnect, refer to
.
• Always route and secure the harnesses properly after work. The interference of the harness with a
bracket, etc. may cause the MIL to illuminate due to the short circuit.
• Always connect rubber tubes properly after work. A misconnected or disconnected rubber tube may
cause the MIL to illuminate due to the malfunction of the EVAP system or fuel injection system, etc.
• Always erase the unnecessary malfunction information (repairs completed) from the ECM and TCM
(Transmission control module) before returning the vehicle to the customer.
Precaution
INFOID:0000000005257925
•
Always use a 12 volt battery as power source.
•
Never attempt to disconnect battery cables while engine is
running.
•
Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative bat-
tery cable. Failure to do so may damage the ECM because
battery voltage is applied to ECM even if ignition switch is
turned OFF.
•
Before removing parts, turn ignition switch OFF and then dis-
connect negative battery cable.
SEF289H
2010 Pathfinder
PRECAUTIONS
EC-953
< PRECAUTION >
[VK56DE]
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•
Never disassemble ECM.
•
If a battery cable is disconnected, the memory will return to
the ECM value.
The ECM will now start to self-control at its initial value. Thus,
engine operation can vary slightly in this case. However, this
is not an indication of a malfunction. Never replace parts
because of a slight variation.
•
If the battery is disconnected, the following emission-related
diagnostic information will be cleared within 24 hours.
-
Diagnostic trouble codes
-
1st trip diagnostic trouble codes
-
Freeze frame data
-
1st trip freeze frame data
-
System readiness test (SRT) codes
-
Test values
•
When connecting ECM harness connector, fasten it securely
with a lever as far as it will go as shown in the figure.
•
When connecting or disconnecting pin connectors into or
from ECM, never damage pin terminals (bends or breaks).
Check that there are not any bends or breaks on ECM pin ter-
minal, when connecting pin connectors.
•
Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge) volt-
age to develop in coil and condenser, thus resulting in dam-
age to ICs.
•
Keep engine control system harness at least 10 cm (4 in) away
from adjacent harness, to prevent engine control system mal-
functions due to receiving external noise, degraded operation
of ICs, etc.
•
Keep engine control system parts and harness dry.
•
Before replacing ECM, perform ECM Terminals and Reference
Value inspection and check that ECM functions properly.
Refer to
EC-899, "ECM Terminal and Reference Value"
•
Handle mass air flow sensor carefully to avoid damage.
•
Never disassemble mass air flow sensor.
•
Never clean mass air flow sensor with any type of detergent.
•
Never disassemble electric throttle control actuator.
•
Even a slight leakage in the air intake system can cause seri-
ous incidents.
•
Never shock or jar the camshaft position sensor (PHASE),
crankshaft position sensor (POS).
PBIB1164E
PBIB1512E
PBIB0090E
MEF040D
2010 Pathfinder
EC-954
< PRECAUTION >
[VK56DE]
PRECAUTIONS
•
After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Overall Function
Check should be a good result if the repair is completed.
•
When measuring ECM signals with a circuit tester, never allow
the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.
•
Never use ECM ground terminals when measuring input/out-
put voltage. Doing so may result in damage to the ECM's tran-
sistor. Use a ground other than ECM terminals, such as the
ground.
•
B1 indicates bank 1, B2 indicates bank 2 as shown in the fig-
ure.
SEF217U
SEF348N
PBIB1144E
2010 Pathfinder
PRECAUTIONS
EC-955
< PRECAUTION >
[VK56DE]
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•
Never operate fuel pump when there is no fuel in lines.
•
Tighten fuel hose clamps to the specified torque.
•
Never depress accelerator pedal when starting.
•
Immediately after starting, do not rev up engine unnecessar-
ily.
•
Never rev up engine just prior to shutdown.
•
When installing C.B. ham radio or a mobile phone, always
observe the following as it may adversely affect electronic
control systems depending on installation location.
-
Keep the antenna as far as possible from the electronic con-
trol units.
-
Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Never let them run parallel for a long distance.
-
Adjust the antenna and feeder line so that the standing-wave
radio can be kept smaller.
-
Always ground the radio to vehicle body.
BBIA0529E
SEF709Y
SEF708Y
2010 Pathfinder
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