Nissan Altima L32. Instruction — part 355
ENGINE CONTROL SYSTEM SYMPTOMS
EC-541
< SYMPTOM DIAGNOSIS >
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C
D
E
F
G
H
I
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K
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A
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
N
TING
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 gaso-
line, Low octane)
—
Air
Air duct
5
5
5
5
5
5
Air cleaner
Air leakage from air duct
(Mass air flow sensor — elec-
tric throttle control actuator)
5
5
5
5
Electric throttle control actua-
tor
Air leakage from intake mani-
fold/Collector/Gasket
Cranking
Battery
1
1
1
1
1
1
1
1
(Coupe)
dan)
Generator circuit
Starter circuit
3
Signal plate
6
PNP switch
4
(M/T)
(CVT)
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-542
< SYMPTOM DIAGNOSIS >
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ENGINE CONTROL SYSTEM SYMPTOMS
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
3
Exhaust valve
Exhaust
Exhaust manifold/Tube/Muf-
fler/Gasket
5
5
5
5
5
5
5
5
Three way catalyst
HC adsorption 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
NVIS (NISSAN Vehicle Immobilizer Sys-
tem — NATS)
1
1
(Coupe)
(Se-
dan)
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
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
NORMAL OPERATING CONDITION
EC-543
< SYMPTOM DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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NORMAL OPERATING CONDITION
Description
INFOID:0000000004349558
FUEL CUT CONTROL (AT NO LOAD AND HIGH ENGINE SPEED)
If the engine speed is above 1,800 rpm under no load (for example, the selector lever position is neutral and
engine speed is over 1,800 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 1,500 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration control listed under Multiport Fuel Injection (MFI) System,
EC-544
< PRECAUTION >
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PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004351922
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 SR 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 SR section.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Instruction. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
Precaution for Procedure without Cowl Top Cover
INFOID:0000000004351924
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
On Board Diagnostic (OBD) System of Engine and CVT
INFOID:0000000004349562
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
• Be sure to 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 light up.
• Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to light up due to the open circuit. (Be sure 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
(coupe) or
(sedan).
• Be sure to route and secure the harnesses properly after work. The interference of the harness with
a bracket, etc. may cause the MIL to light up due to the short circuit.
• Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to the malfunction of the EVAP system or fuel injection system,
etc.
• Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PIIB3706J
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