2008 NISSAN TEANA engine

EC-5
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P2122, P2123 APP SENSOR ...........................304
Description ............................................................304
DTC Logic .............................................................304
Diagnosis Procedure .............................................304
Component Inspection ..........................................306
Special Repair Requirement .................................306
P2127, P2128 APP SENSOR ...........................307
Description ............................................................307
DTC Logic .............................................................307
Diagnosis Procedure .............................................307
Component Inspection ..........................................309
Special Repair Requirement .................................310
P2135 TP SENSOR ..........................................311
Description ............................................................311
DTC Logic .............................................................311
Diagnosis Procedure .............................................311
Component Inspection ..........................................313
Special Repair Requirement .................................313
P2138 APP SENSOR .......................................314
Description ............................................................314
DTC Logic .............................................................314
Diagnosis Procedure .............................................314
Component Inspection ..........................................316
Special Repair Requirement .................................317
P2A00, P2A03 A/F SENSOR 1 ........................318
Description ............................................................318
DTC Logic .............................................................318
Diagnosis Procedure .............................................319
ASCD BRAKE SWITCH ...................................321
Description ............................................................321
Component Function Check ..................................321
Diagnosis Procedure .............................................321
Component Inspection (ASCD Brake Switch) .......322
ASCD INDICATOR ...........................................323
Description ............................................................323
Component Function Check ..................................323
Diagnosis Procedure .............................................323
COOLING FAN .................................................324
Description ............................................................324
Component Function Check ..................................324
Diagnosis Procedure .............................................324
Component Inspection (Cooling Fan Motor) .........327
Component Inspection (Cooling Fan Relay) .........328
ELECTRICAL LOAD SIGNAL .........................329
Description ............................................................329
Component Function Check ..................................329
Diagnosis Procedure .............................................329
ELECTRONIC CONTROLLED ENGINE
MOUNT .............................................................
331
Description ............................................................331
Component Function Check ..................................331
Diagnosis Procedure .............................................331
Component Inspection ...........................................332
FUEL INJECTOR ............................................334
Description .............................................................334
Component Function Check ..................................334
Diagnosis Procedure .............................................334
Component Inspection ...........................................336
FUEL PUMP ....................................................337
Description .............................................................337
Component Function Check ..................................337
Diagnosis Procedure .............................................337
Component Inspection (Fuel Pump) ......................340
Component Inspection (Condenser) ......................340
IGNITION SIGNAL ..........................................341
Description .............................................................341
Component Function Check ..................................341
Diagnosis Procedure .............................................341
Component Inspection (Ignition Coil with Power
Transistor) .............................................................
344
Component Inspection (Condenser) ......................345
MALFUNCTION INDICATOR .........................346
Description .............................................................346
Component Function Check ..................................346
Diagnosis Procedure .............................................346
POSITIVE CRANKCASE VENTILATION .......347
Description .............................................................347
Component Inspection ...........................................347
REFRIGERANT PRESSURE SENSOR ..........348
Description .............................................................348
Component Function Check ..................................348
Diagnosis Procedure .............................................348
VARIABLE INDUCTION AIR SYSTEM ..........351
Description .............................................................351
Component Function Check (VQ35DE engine) .....351
Component Function Check (VQ25DE engine) .....353
Diagnosis Procedure (VQ35DE engine) ................353
Diagnosis Procedure (VQ25DE engine) ................355
ECU DIAGNOSIS .......................................357
ECM .................................................................357
Reference Value ....................................................357
Wiring Diagram—ENGINE CONTROL SYS-
TEM— ...................................................................
371
Fail safe .................................................................386
DTC Inspection Priority Chart .............................388
DTC Index .............................................................389
How to Set SRT Code ........................................392
Test Value and Test Limit ...................................394
SYMPTOM DIAGNOSIS ............................400
ENGINE CONTROL SYSTEM SYMPTOMS ...400
Symptom Table .....................................................400
NORMAL OPERATING CONDITION .............404

EC-6
Description .............................................................404
PRECAUTION ............................................405
PRECAUTIONS ...............................................405
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ................................................................
405
Precautions For Xenon Headlamp Service ...........405
Precaution for Procedure without Cowl Top Cover ..405
On Board Diagnostic (OBD) System of Engine
and CVT ................................................................
405
General Precautions ..............................................406
PREPARATION ..........................................410
PREPARATION ...............................................410
Special Service Tools ............................................410
Commercial Service Tools .....................................410
ON-VEHICLE MAINTENANCE .................411
FUEL PRESSURE ............................................411
Inspection ..............................................................411
ON-VEHICLE REPAIR ..............................413
EVAPORATIVE EMISSION SYSTEM ..............413
Inspection ..............................................................413
SERVICE DATA AND SPECIFICATIONS
(SDS) .........................................................
414
SERVICE DATA AND SPECIFICATIONS
(SDS) ................................................................
414
Idle Speed .............................................................414
Ignition Timing .......................................................414
Calculated Load Value ..........................................414
Mass Air Flow Sensor ...........................................414

EC-10
< BASIC INSPECTION >[VQ25DE, VQ35DE]
DIAGNOSIS AND REPAIR WORKFLOW
Diagnostic Work Sheet
INFOID:0000000003856443
DESCRIPTION
There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about an incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the WORKSHEET SAMPLE
below in order to organize all the information for troubleshooting.
Some conditions may cause the MI to come on steady or blink, and
DTC to be detected. Examples:
 Vehicle ran out of fuel, which caused the engine to misfire.
 Fuel filler cap was left off or incorrectly screwed on, allowing fuel to
evaporate into the atmosphere.
WORKSHEET SAMPLE
SEF907L
MTBL0017

INSPECTION AND ADJUSTMENT
EC-11
< BASIC INSPECTION >[VQ25DE, VQ35DE]
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INSPECTION AND ADJUSTMENT
BASIC INSPECTION
BASIC INSPECTION : Special Repair RequirementINFOID:0000000003856444
1.INSPECTION START
1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.
2. Open engine hood and check the following:
- Harness connectors for improper connections
- Wiring harness for improper connections, pinches and cut
- Vacuum hoses for splits, kinks and improper connections
- Hoses and ducts for leaks
- Air cleaner clogging
- Gasket
3. Confirm that electrical or mechanical loads are not applied.
- Head lamp switch is OFF.
- Air conditioner switch is OFF.
- Rear window defogger switch is OFF.
- Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature
indicator points the middle of gauge.
Ensure engine stays below 1,000 rpm.
5. Run engine at about 2,000 rpm for about 2 minutes under no
load.
6. Check that no DTC is displayed with CONSULT-III or GST.
Are any DTCs detected?
YES >> GO TO 2.
NO >> GO TO 3.
2.REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3
3.CHECK TARGET IDLE SPEED
1. Run engine at about 2,000 rpm for about 2 minutes under no load.
SEF983U
SEF976U
SEF977U

EC-12
< BASIC INSPECTION >[VQ25DE, VQ35DE]
INSPECTION AND ADJUSTMENT
2. Rev engine between 2,000 and 3,000 rpm 2 or 3 times under no
load, then run engine at idle speed for about 1 minute.
3. Check idle speed.
For procedure, refer to EC-14, "
IDLE SPEED : Special Repair
Requirement".
For specification, refer to EC-414, "
Idle Speed".
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 4.
4.PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-15, "
ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
ment".
>> GO TO 5.
5.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-16, "
THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".
>> GO TO 6.
6.PERFORM IDLE AIR VOLUME LEARNING
Perform EC-16, "
IDLE AIR VOLUME LEARNING : Special Repair Requirement".
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 7.
NO >> Follow the instruction of Idle Air Volume Learning. Then GO TO 4.
7.CHECK TARGET IDLE SPEED AGAIN
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
For procedure, refer to EC-14, "
IDLE SPEED : Special Repair Requirement".
For specification, refer to EC-414, "
Idle Speed".
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the Following.
 Check camshaft position sensor (PHASE) and circuit. Refer to EC-223, "
Diagnosis Procedure".
 Check crankshaft position sensor (POS) and circuit. Refer to EC-219, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 9.
NO >> 1. Repair or replace malfunctioning part.
2. GO TO 4.
9.CHECK ECM FUNCTION
1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident,
although this is rare.)
2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
SEC-8, "
ECM RE-COMMUNICATING FUNCTION : Description".
>> GO TO 4.
10.CHECK IGNITION TIMING
1. Run engine at idle.
PBIA8513J

INSPECTION AND ADJUSTMENT
EC-13
< BASIC INSPECTION >[VQ25DE, VQ35DE]
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2. Check ignition timing with a timing light.
For procedure, refer to EC-15, "
IGNITION TIMING : Special Repair Requirement".
For specification, refer to EC-414, "
Ignition Timing".
Is the inspection result normal?
YES >> GO TO 19.
NO >> GO TO 11.
11 .PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform EC-15, "
ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
ment".
>> GO TO 12.
12.PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform EC-16, "
THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".
>> GO TO 13.
13.PERFORM IDLE AIR VOLUME LEARNING
Perform EC-16, "
IDLE AIR VOLUME LEARNING : Special Repair Requirement".
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 14.
NO >> Follow the instruction of Idle Air Volume Learning. Then GO TO 4.
14.CHECK TARGET IDLE SPEED AGAIN
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
For procedure, refer to EC-14, "
IDLE SPEED : Special Repair Requirement".
For specification, refer to EC-414, "
Idle Speed".
Is the inspection result normal?
YES >> GO TO 15.
NO >> GO TO 17.
15.CHECK IGNITION TIMING AGAIN
1. Run engine at idle.
2. Check ignition timing with a timing light.
For procedure, refer to EC-15, "
IGNITION TIMING : Special Repair Requirement".
For specification, refer to EC-414, "
Ignition Timing".
Is the inspection result normal?
YES >> GO TO 19.
NO >> GO TO 16.
16.CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to EM-53, "
Removal and Installation".
Is the inspection result normal?
YES >> GO TO 17.
NO >> 1. Repair the timing chain installation.
2. GO TO 4.
17.DETECT MALFUNCTIONING PART
Check the following.
 Check camshaft position sensor (PHASE) and circuit. Refer to EC-223, "
Diagnosis Procedure".
 Check crankshaft position sensor (POS) and circuit. Refer to EC-219, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 18.
NO >> 1. Repair or replace malfunctioning part.

EC-16
< BASIC INSPECTION >[VQ25DE, VQ35DE]
INSPECTION AND ADJUSTMENT
THROTTLE VALVE CLOSED POSITION LEARNING
THROTTLE VALVE CLOSED POSITION LEARNING : DescriptionINFOID:0000000003856455
Throttle Valve Closed Position Learning is an operation to learn the fully closed position of the throttle valve by
monitoring the throttle position sensor output signal. It must be performed each time harness connector of
electric throttle control actuator or ECM is disconnected.
THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement
INFOID:0000000003856456
1.START
1. Check that accelerator pedal is fully released.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
Check that throttle valve moves during above 10 seconds by confirming the operating sound.
>> END
IDLE AIR VOLUME LEARNING
IDLE AIR VOLUME LEARNING : DescriptionINFOID:0000000003856457
Idle Air Volume Learning is a function of ECM to learn the idle air volume that keeps engine idle speed within
the specific range. It must be performed under the following conditions:
 Each time electric throttle control actuator or ECM is replaced.
 Idle speed or ignition timing is out of specification.
IDLE AIR VOLUME LEARNING : Special Repair RequirementINFOID:0000000003856458
1.PRECONDITIONING
Before performing Idle Air Volume Learning, check that all of the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are missed for even a moment.
 Battery voltage: More than 12.9 V (At idle)
 Engine coolant temperature: 70 - 100°C (158 - 212°F)
 Selector lever: P or N
 Electric load switch: OFF
(Air conditioner, head lamp, rear window defogger)
-For vehicle equipped with daytime light systems, perform one of the following procedures before
starting engine not to illuminate headlamps.
 Apply parking brake
 Set lighting switch to the 1st position
 Steering wheel: Neutral (Straight-ahead position)
 Vehicle speed: Stopped
 Transmission: Warmed-up
- With CONSULT-III: Drive vehicle until “ATF TEMP SEN” in “DATA MONITOR” mode of “CVT” system indi-
cates less than 0.9 V.
- Without CONSULT-III: Drive vehicle for 10 minutes.
Will CONSULT-III be used?
YES >> GO TO 2.
NO >> GO TO 3.
2.PERFORM IDLE AIR VOLUME LEARNING
With CONSULT-III
1. Perform EC-15, "
ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
ment".
2. Perform EC-16, "
THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".
3. Start engine and warm it up to normal operating temperature.
4. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
5. Touch “START” and wait 20 seconds.

INSPECTION AND ADJUSTMENT
EC-17
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Is “CMPLT” displayed on CONSULT-III screen?
YES >> GO TO 4.
NO >> GO TO 5.
3.PERFORM IDLE AIR VOLUME LEARNING
Without CONSULT-III
NOTE:
It is better to count the time accurately with a clock.
It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has
a malfunction.
1. Perform EC-15, "
ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
ment".
2. Perform EC-16, "
THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement".
3. Start engine and warm it up to normal operating temperature.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
6. Repeat the following procedure quickly 5 times within 5 seconds.
- Fully depress the accelerator pedal.
- Fully release the accelerator pedal.
7. Wait 7 seconds, fully depress the accelerator pedal for approx. 20 seconds until the MI stops blinking and
turns ON.
8. Fully release the accelerator pedal within 3 seconds after the MI turns ON.
9. Start engine and let it idle.
10. Wait 20 seconds.
>> GO TO 4.
4.CHECK IDLE SPEED AND IGNITION TIMING
Rev up the engine 2 or 3 times and check that idle speed and ignition timing are within the specifications.
For procedure, refer to EC-14, "
IDLE SPEED : Special Repair Requirement" and EC-15, "IGNITION TIMING :
Special Repair Requirement".
For specifications, refer to EC-414, "
Idle Speed" and EC-414, "Ignition Timing".
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART-I
Check the following
 Check that throttle valve is fully closed.
 Check PCV valve operation.
 Check that downstream of throttle valve is free from air leakage.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace malfunctioning part.
6.DETECT MALFUNCTIONING PART-II
When the above three items check out OK, engine component parts and their installation condition are ques-
tionable. Check and eliminate the cause of the incident.
It is useful to perform “TROUBLE DIAGNOSIS - SPECIFICATION VALUE”. Refer to EC-124, "
Description".
PBIB0665E