Nissan Teana J32. Manual — part 368
EC-10
< BASIC INSPECTION >
[VQ25DE, VQ35DE]
DIAGNOSIS AND REPAIR WORKFLOW
Diagnostic Work Sheet
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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
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INSPECTION AND ADJUSTMENT
BASIC INSPECTION
BASIC INSPECTION : Special Repair Requirement
INFOID: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
.
For specification, refer to
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-
>> 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
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
.
• Check crankshaft position sensor (POS) and circuit. Refer to
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
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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
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-
.
>> 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
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
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
• Check crankshaft position sensor (POS) and circuit. Refer to
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> 1.
Repair or replace malfunctioning part.
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