
SQUEAK AND RATTLE TROUBLE DIAGNOSESDLK-165
< SYMPTOM DIAGNOSIS >
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If the noise can be duplicated easily during the test drive, to help identify the source of the noise, try to dupli-
cate the noise with the vehicle stopped by doing one or all of the following:
1) Close a door.
2) Tap or push/pull around the area where the noise appears to be coming from.
3) Rev the engine.
4) Use a floor jack to recreate vehicle “twist”.
5) At idle, apply engine load (electrical load, half-clutch on M/T model, drive position on CVT and A/T models).
6) Raise the vehicle on a hoist and hit a tire with a rubber hammer.
• Drive the vehicle and attempt to duplicate the conditions the customer states exist when the noise occurs.
• If it is difficult to duplicate the noise, drive the vehicle slowly on an undulating or rough road to stress the vehicle body.
CHECK RELATED SERVICE BULLETINS
After verifying the customer concern or symptom, che ck ASIST for Technical Service Bulletins (TSBs) related
to that concern or symptom.
If a TSB relates to the symptom, follow the procedure to repair the noise.
LOCATE THE NOISE AND IDENTIFY THE ROOT CAUSE
1. Narrow down the noise to a general area. To help pi npoint the source of the noise, use a listening tool
(Chassis Ear: J-39570, Engine Ear: J-39565 and mechanic's stethoscope).
2. Narrow down the noise to a more specific area and identify the cause of the noise by: • removing the components in the area that you suspect the noise is coming from.
Do not use too much force when removing clips and fasteners, otherwise clips and fasteners can be
broken or lost during the repair, resulting in the creation of new noise.
• tapping or pushing/pulling the component that you suspect is causing the noise.
Do not tap or push/pull the component with excessive force, otherwise the noise will be eliminated only
temporarily.
• feeling for a vibration with your hand by touching the component(s) that you suspect is (are) causing the
noise.
• placing a piece of paper between components that you suspect are causing the noise.
• looking for loose components and contact marks. Refer to DLK-165, "Generic Squeak and Rattle Troubleshooting"
.
REPAIR THE CAUSE
• If the cause is a loose component, tighten the component securely.
• If the cause is insufficient clearance between components:
- separate components by repositioning or loos ening and retightening the component, if possible.
- insulate components with a suitable insulator such as urethane pads, foam blocks, felt cloth tape or urethane tape. A NISSAN Squeak and Rattle Kit (J-50397) is av ailable through your authorized NISSAN Parts Depart-
ment.
CAUTION:
Do not use excessive force as many components are constructed of plastic and may be damaged.
NOTE:
• Always check with the Parts Department for the latest parts information.
• The materials contained in the NISSAN Squeak and Rattle Kit (J-50397) are listed on the inside cover of the
kit; and can each be ordered seperately as needed.
• The following materials not found in the kit can also be used to repair squeaks and rattles.
- SILICONE GREASE: Use instead of UHMW tape that will be visible or does not fit. The silicone grease will
only last a few months.
- SILICONE SPRAY: Use when grease cannot be applied.
- DUCT TAPE: Use to eliminate movement.
CONFIRM THE REPAIR
Confirm that the cause of a noise is repaired by test driving the vehicle. Operate the vehicle under the same
conditions as when the noise originally occurred. Refer to the notes on the Diagnostic Worksheet.
Generic Squeak and Rattle TroubleshootingINFOID:0000000009889730
Refer to Table of Contents for specific component removal and installation information.
INSTRUMENT PANEL
Most incidents are caused by contact and movement between:
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SQUEAK AND RATTLE TROUBLE DIAGNOSESDLK-167
< SYMPTOM DIAGNOSIS >
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3. Loose screws at console attachment points.
SEATS
When isolating seat noise it's important to note the pos ition the seat is in and the load placed on the seat when
the noise is present. These conditions should be duplic ated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. The rear seatback lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of thes e incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted underhood noise include:
1. Any component installed to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator installation pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine rpm or
load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

DLK-176
< REMOVAL AND INSTALLATION >
HOOD
HOOD LOCK CONTROL : Re moval and Installation
INFOID:0000000009461928
REMOVAL
1. Release the radiator core support upper cover clips, then remove the radiator core support upper cover.
2. Remove the hoodledge finisher clips (LH), then remove the hoodledge finisher LH.
3. Disconnect the hood switch harness connector (A) (if equipped). : Front
4. Remove the hood lock assembly bolts ( ).
5. Disconnect the hood lock release cable from t he hood lock assembly and unclip from the hoodledge.
6. Remove the fender protector LH. Refer to EXT-26, "FENDER PROTECTOR : Removal and Installation"
.
7. Remove the bolts (A), then separate the hood lock/fuel filler door release handle assembly (1) from the hood lock release cable
(3) and fuel filler door release cable (2).
8. Remove the grommet from the upper dash assembly and pull the hood lock release cable into the passen- ger compartment.
CAUTION:
While pulling, be careful no t to damage (peel) the outsid e of the hood lock release cable.
INSTALLATION
1. Pull the hood lock release cable through the upper dash assembly into the engine compartment.
CAUTION:
Be careful not to bend the cable too much , keep the radius 100 mm (3.94 in) or more.
ALKIA2664ZZ
ALKIA0027GB
ALKIA2665ZZ
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

INTELLIGENT KEY WARNING BUZZERDLK-223
< REMOVAL AND INSTALLATION >
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INTELLIGENT KEY WARNING BUZZER
Removal and InstallationINFOID:0000000009461975
REMOVAL
NOTE:
The Intelligent Key warning buzzer is located in the left front area of the engine compartment.
1. Remove the Intelligent Key warning buzzer harness clip.
2. Remove the nut (B) that retains the Intelligent Key warning buzzer (1) to the body.
3. Disconnect the harness connector (A) from the Intelligent Key warning buzzer (1) and remove.
INSTALLATION
Installation is in the reverse order of removal.
ALKIA2728ZZ
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EC-1
ENGINE
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SECTION EC
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CONTENTS
ENGINE CONTROL SYSTEM
QR25DE
PRECAUTION ................ ..............................
15
PRECAUTIONS .............................................. ....15
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
15
Precaution for Procedure without Cowl Top Cover ....15
On Board Diagnostic (OBD) System of Engine
and CVT .............................................................. ....
15
General Precautions ...............................................16
PREPARATION ...........................................19
PREPARATION .............................................. ....19
Special Service Tools .......................................... ....19
Commercial Service Tools ......................................19
SYSTEM DESCRIPTION .............................21
COMPONENT PARTS ................................... ....21
Component Parts Location ................................ ....21
ECM ........................................................................25
Accelerator Pedal Position Sensor ...................... ....25
Electric Throttle Control Actuator ........................ ....25
Ignition Coil With Power Transistor .........................26
Fuel Injector ........................................................ ....26
Fuel Level Sensor Unit and Fuel Pump .............. ....26
Fuel Tank Temperature Sensor .......................... ....27
Mass Air Flow Sensor (With Intake Air Tempera-
ture Sensor) ........................................................ ....
27
Manifold Absolute Pressure Sensor ........................28
Engine Coolant Temperature Sensor .................. ....28
Crankshaft Position Sensor (POS) ..........................29
Camshaft Position Sens or (PHASE) .......................29
Intake Valve Timing Cont rol Solenoid Valve ...........30
Intake Valve Timing Intermediate Lock Control
Solenoid Valve .................................................... ....
30
Exhaust Valve Timing Control Position Sensor .......30
Exhaust Valve Timing Control Solenoid Valve ........31
Intake Manifold Runner Control Valve ................. ....31
Intake Manifold Tuning Valve ..................................31
Air Fuel Ratio (A/F) Sensor 1 ..................................32
Heated Oxygen Sensor 2 ........................................32
Knock Sensor ..........................................................33
Engine Oil Pressure Sensor ....................................33
Engine Oil Temperature Sensor .......................... ....33
Cooling Fan .............................................................34
EVAP Canister .........................................................34
EVAP Canister Purge Volu me Control Solenoid
Valve .................................................................... ....
34
EVAP Canister Vent Control Valve ..........................35
EVAP Control System Pres sure Sensor ..................35
Battery Current Sensor (With Battery Tempera-
ture Sensor) ......................................................... ....
35
Malfunction Indicator lamp (MIL) .............................36
Oil Pressure Warning Lamp ....................................36
Refrigerant Pressure Sensor ............................... ....36
Stop Lamp Switch & Brake Pedal Position Switch ....36
ASCD Steering Switch .............................................37
Information Display ..................................................37
STRUCTURE AND OPERATION .....................38
Positive Crankcase Ventilation ................................38
On Board Refueling Vapor Recovery (ORVR) ........39
SYSTEM ............................................................40
ENGINE CONTROL SYSTEM ........................ ...........40
ENGINE CONTROL SYSTEM : System Descrip-
tion ....................................................................... ....
40
ENGINE CONTROL SYSTEM : Fail Safe ..............41
MULTIPORT FUEL INJECTION SYSTEM ................43
MULTIPORT FUEL INJECTION SYSTEM : Sys-
tem Description (with auto matic air conditioner) ......
43
MULTIPORT FUEL INJECTION SYSTEM : Sys-
tem Description (with manual air conditioner) .........
46
ELECTRIC IGNITION SYSTEM .................................48
ELECTRIC IGNITION SYSTEM : System De-
scription ............................................................... ....
48
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EC-2
INTAKE VALVE TIMING CONTROL ........................49
INTAKE VALVE TIMING CONTROL : System De-
scription ............................................................... ...
49
EXHAUST VALVE TIMING CONTROL ................. ...52
EXHAUST VALVE TIMING CONTROL : System
Description ........................................................... ...
52
INTAKE MANIFOLD RUNNER CONTROL ........... ...53
INTAKE MANIFOLD RUNNER CONTROL : Sys-
tem Description .................................................... ...
53
INTAKE MANIFOLD TUNING SYSTEM ...................54
INTAKE MANIFOLD TUNI NG SYSTEM : System
Description ........................................................... ...
54
ENGINE PROTECTION CONTROL AT LOW EN-
GINE OIL PRESSURE ....... .......................................
55
ENGINE PROTECTION CONTROL AT LOW EN-
GINE OIL PRESSURE : S ystem Description .........
55
FUEL FILLER CAP WARNING SYSTEM .............. ...55
FUEL FILLER CAP WARNING SYSTEM : System
Description ........................................................... ...
56
AIR CONDITIONING CUT CONTROL ................... ...56
AIR CONDITIONING CUT CONTROL : System
Description (with automatic air conditioner) ......... ...
56
AIR CONDITIONING CUT CONTROL : System
Description (with manual air conditioner) ................
57
COOLING FAN CONTROL .................................... ...58
COOLING FAN CONTROL : System Description
(with automatic air condit ioner) ...............................
59
COOLING FAN CONTROL : System Description
(with manual air conditio ner) ..................................
60
EVAPORATIVE EMISSION SYSTEM .................... ...61
EVAPORATIVE EMISSION SYSTEM : System
Description ........................................................... ...
62
AUTOMATIC SPEED CONTROL DEVICE (ASCD) ...63
AUTOMATIC SPEED CONTROL DEVICE (AS-
CD) : System Description .................................... ...
63
CAN COMMUNICATION ........................................ ...64
CAN COMMUNICATION : System Description ......64
OPERATION ................................................... ...65
AUTOMATIC SPEED CONTROL DEVICE (ASCD) ...65
AUTOMATIC SPEED CONTROL DEVICE (AS-
CD) : Switch Name and Function ........................ ...
65
ON BOARD DIAGNOSTIC (OBD) SYSTEM .....66
Diagnosis Description .......................................... ...66
GST (Generic Scan Tool) .......................................66
DIAGNOSIS SYSTEM (ECM) ............................67
DIAGNOSIS DESCRIPTION .................................. ...67
DIAGNOSIS DESCRIPTION : 1st Trip Detection
Logic and Two Trip Detection Logic .................... ...
67
DIAGNOSIS DESCRIPTION : DTC and Freeze
Frame Data .......................................................... ...
67
DIAGNOSIS DESCRIPTION : Counter System ......68
DIAGNOSIS DESCRIPTION : Driving Pattern ........71
DIAGNOSIS DESCRIPTION : System Readiness
Test (SRT) Code .................................................. ...
72
DIAGNOSIS DESCRIPTION : Permanent Diag-
nostic Trouble Code (Permanent DTC) ............... ...
73
DIAGNOSIS DESCRIPTION : Malfunction Indica-
tor Lamp (MIL) ..................................................... ...
74
On Board Diagnosis Function .................................74
CONSULT Function ................................................77
ECU DIAGNOSIS INFORMATION .............88
ECM ...................................................................88
Reference Value .................................................. ...88
Fail Safe ...............................................................101
DTC Inspection Priority Chart .............................104
DTC Index ............................................................105
Test Value and Test Limit .....................................109
WIRING DIAGRAM ...................................117
ENGINE CONTROL SYSTEM ........................ ..117
Wiring Diagram .................................................... .117
BASIC INSPECTION .................................165
DIAGNOSIS AND REPAIR WORKFLOW ...... ..165
Work Flow ............................................................ .165
Diagnostic Work Sheet .........................................168
BASIC INSPECTION ...................................... ..170
Work Procedure ................................................... .170
ADDITIONAL SERVICE WHEN REPLACING
ECM ................................................................ ..
174
Description ........................................................... .174
Work Procedure ....................................................174
VIN REGISTRATION ........................................176
Description ........................................................... .176
Work Procedure ....................................................176
ACCELERATOR PEDAL RELEASED POSI-
TION LEARNING ............................................ ..
177
Description ........................................................... .177
Work Procedure ....................................................177
THROTTLE VALVE CLOSED POSITION
LEARNING ..................................................... ..
178
Description ........................................................... .178
Work Procedure ....................................................178
IDLE AIR VOLUME LEARNING .......................179
Description ........................................................... .179
Work Procedure ....................................................179
MIXTURE RATIO SELF-LEARNING VALUE
CLEAR ............................................................ ..
181
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EC-5
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P0447 EVAP CANISTER VENT CONTROL
VALVE ............................................................ ..
350
DTC Logic ........................................................... ..350
Diagnosis Procedure .............................................350
Component Inspection ..........................................352
P0448 EVAP CANISTER VENT CONTROL
VALVE ............................................................ ..
354
DTC Logic ........................................................... ..354
Diagnosis Procedure .............................................355
Component Inspection ..........................................356
P0451 EVAP CONTROL SYSTEM PRES-
SURE SENSOR .............................................. ..
358
DTC Logic ........................................................... ..358
Diagnosis Procedure .............................................359
Component Inspection ..........................................361
P0452 EVAP CONTROL SYSTEM PRES-
SURE SENSOR .............................................. ..
362
DTC Logic ........................................................... ..362
Diagnosis Procedure .............................................363
Component Inspection ..........................................364
P0453 EVAP CONTROL SYSTEM PRES-
SURE SENSOR .............................................. ..
366
DTC Logic ........................................................... ..366
Diagnosis Procedure .............................................367
Component Inspection ..........................................369
P0456 EVAP CONTROL SYSTEM ..................370
DTC Logic ........................................................... ..370
Diagnosis Procedure .............................................371
Component Inspection ..........................................375
P0460 FUEL LEVEL SENSOR ........................376
DTC Logic ........................................................... ..376
Diagnosis Procedure .............................................376
P0461 FUEL LEVEL SENSOR ........................377
DTC Logic ........................................................... ..377
Component Function Check ..................................377
Diagnosis Procedure .............................................378
P0462, P0463 FUEL LEVEL SENSOR ............379
DTC Logic ........................................................... ..379
Diagnosis Procedure .............................................379
P0500 VSS .......................................................380
Description .......................................................... ..380
DTC Logic .............................................................380
Diagnosis Procedure .............................................380
P0506 ISC SYSTEM .........................................382
Description .......................................................... ..382
DTC Logic .............................................................382
Diagnosis Procedure .............................................382
P0507 ISC SYSTEM .........................................384
Description .......................................................... ..384
DTC Logic .............................................................384
Diagnosis Procedure ........................................... ..384
P050A, P050B, P050E COLD START CON-
TROL ...............................................................
386
Description ........................................................... ..386
DTC Logic ..............................................................386
Diagnosis Procedure .............................................387
P0520 EOP SENSOR ......................................388
DTC Logic ..............................................................388
Diagnosis Procedure .............................................388
Component Inspection ...........................................390
P0524 ENGINE OIL PRESSURE ....................391
DTC Logic ..............................................................391
Diagnosis Procedure .............................................392
Component Inspection ...........................................393
P052A, P052B INTAKE VALVE TIMING CON-
TROL ...............................................................
394
DTC Logic ............................................................ ..394
Diagnosis Procedure .............................................394
Component Inspection (Intake Valve Timing Con-
trol Solenoid Valve) ............................................. ..
396
Component Inspection (Intake Valve Timing Inter-
mediate Lock Control Solenoid Valve) ................ ..
397
Component Inspection (Crankshaft Position sen-
sor) ...................................................................... ..
397
Component Inspection (Camshaft position sen-
sor) ...................................................................... ..
398
P0603 ECM .....................................................400
DTC Logic ..............................................................400
Diagnosis Procedure .............................................400
P0604 ECM .....................................................401
DTC Logic ..............................................................401
Diagnosis Procedure .............................................401
P0605 ECM .....................................................402
DTC Logic ..............................................................402
Diagnosis Procedure .............................................402
P0606 ECM .....................................................403
DTC Logic ..............................................................403
Diagnosis Procedure .............................................403
P0607 ECM .....................................................404
DTC Logic ..............................................................404
Diagnosis Procedure .............................................404
P060A ECM .....................................................405
DTC Logic ..............................................................405
Diagnosis Procedure .............................................405
P060B ECM .....................................................406
DTC Logic ..............................................................406
Diagnosis Procedure .............................................406
P0643 SENSOR POWER SUPPLY ................407
Description .............................................................407
DTC Logic ..............................................................407
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EC-6
Diagnosis Procedure .............................................408
P0850 PNP SWITCH .......................................410
Description ........................................................... ..410
DTC Logic ..............................................................410
Component Function Check ..................................411
Diagnosis Procedure .............................................411
P1078 EVT CONTROL POSITION SENSOR ..413
DTC Logic ............................................................ ..413
Diagnosis Procedure .............................................413
Component Inspection ...........................................415
P1148 CLOSED LOOP CONTROL .................416
DTC Logic ............................................................ ..416
Diagnosis Procedure .............................................416
P117A AIR FUEL RATIO .................................417
DTC Logic ............................................................ ..417
Diagnosis Procedure .............................................418
P1212 TCS COMMUNICATION LINE .............422
Description ........................................................... ..422
DTC Logic ..............................................................422
Diagnosis Procedure .............................................422
P1217 ENGINE OVER TEMPERATURE .........423
DTC Logic ............................................................ ..423
Component Function Check ..................................423
Diagnosis Procedure .............................................424
P1225 TP SENSOR .........................................426
DTC Logic ............................................................ ..426
Diagnosis Procedure .............................................426
P1226 TP SENSOR .........................................427
DTC Logic ............................................................ ..427
Diagnosis Procedure .............................................427
P1550 BATTERY CURRENT SENSOR ..........428
DTC Logic ............................................................ ..428
Diagnosis Procedure .............................................428
Component Inspection ...........................................429
P1551, P1552 BATTERY CURRENT SEN-
SOR ................................................................. .
431
DTC Logic ............................................................ ..431
Diagnosis Procedure .............................................431
Component Inspection ...........................................432
P1553 BATTERY CURRENT SENSOR ..........434
DTC Logic ............................................................ ..434
Diagnosis Procedure .............................................434
Component Inspection ...........................................435
P1554 BATTERY CURRENT SENSOR ..........437
DTC Logic ............................................................ ..437
Component Function Check ..................................437
Diagnosis Procedure .............................................438
Component Inspection ...........................................439
P1556, P1557 BATTERY TEMPERATURE
SENSOR ......................................................... ..
440
DTC Logic ............................................................ .440
Diagnosis Procedure .............................................440
Component Inspection ..........................................441
P1564 ASCD STEERING SWITCH ..................442
DTC Logic ............................................................ .442
Diagnosis Procedure .............................................442
Component Inspection ..........................................444
P1572 ASCD BRAKE SWITCH ........................445
DTC Logic ............................................................ .445
Diagnosis Procedure .............................................446
Component Inspection (Brake Pedal Position
Switch) ................................................................. .
449
Component Inspection (Stop Lamp Switch) ..........450
Component Inspection (Stop Lamp Relay) ...........450
P1574 ASCD VEHICLE SPEED SENSOR ..... ..452
Description ........................................................... .452
DTC Logic .............................................................452
Diagnosis Procedure .............................................452
P1715 INPUT SPEED SENSOR .......................454
Description ........................................................... .454
DTC Logic .............................................................454
Diagnosis Procedure .............................................454
P1800 INTAKE MANIFOLD TUNING VALVE ..456
DTC Logic .............................................................456
Diagnosis Procedure .............................................456
Component Inspection ..........................................457
P1805 BRAKE SWITCH ................................. ..459
DTC Logic ............................................................ .459
Diagnosis Procedure .............................................459
Component Inspection (Stop Lamp Switch) ..........461
Component Inspection (Stop Lamp Relay) ...........461
P2004 INTAKE MANIFOLD RUNNER CON-
TROL VALVE ................................................. ..
462
DTC Logic ............................................................ .462
Diagnosis Procedure .............................................462
Component Inspection ..........................................463
P2014, P2016, P2017, P2018 INTAKE MANI-
FOLD RUNNER CONTROL VALVE POSI-
TION SENSOR ............................................... ..
465
DTC Logic ............................................................ .465
Diagnosis Procedure .............................................465
P2096, P2097 A/F SENSOR 1 .........................468
DTC Logic ............................................................ .468
Diagnosis Procedure .............................................468
P2100, P2103 THROTTLE CONTROL MO-
TOR RELAY ................................................... ..
472
DTC Logic ............................................................ .472
Diagnosis Procedure .............................................472
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