Nissan Pathfinder (2008 year). Manual — part 297
INSPECTION AND ADJUSTMENT
EC-493
< BASIC INSPECTION >
[VK56DE]
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2.
Rev engine (2,000 to 3,000 rpm) two or three times under no
load, then run engine at idle speed for about 1 minute.
3.
Read idle speed in “DATA MONITOR” mode with CONSULT-III. Refer to
EC-496, "Idle Speed and Ignition
Without CONSULT-III
1.
Run engine at about 2,000 rpm for about 2 minutes under no load.
2.
Rev engine (2,000 to 3,000 rpm) two or three times under no load, then run engine at idle speed for about
1 minute.
3.
Check idle speed.
Refer to
EC-496, "Idle Speed and Ignition Timing Check"
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 4.
4.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1.
Stop engine.
2.
EC-497, "Accelerator Pedal Released Position Learning"
.
>> GO TO 5.
5.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform
EC-497, "Throttle Valve Closed Position Learning"
.
>> GO TO 6.
6.
PERFORM IDLE AIR VOLUME LEARNING
EC-497, "Idle Air Volume Learning"
Is Idle Air Volume Learning carried out successfully?
Yes or No
Yes
>> GO TO 7.
No
>> 1.
Follow the instruction of Idle Air Volume Learning.
2.
GO TO 4.
7.
CHECK TARGET IDLE SPEED AGAIN
With CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Read idle speed in “DATA MONITOR” mode with CONSULT-III.
Refer to
EC-496, "Idle Speed and Ignition Timing Check"
Without CONSULT-III
PBIA8513J
650
±
50 rpm (in P or N position)
650
±
50 rpm (in P or N position)
650
±
50 rpm (in P or N position)
EC-494
< BASIC INSPECTION >
[VK56DE]
INSPECTION AND ADJUSTMENT
1.
Start engine and warm it up to normal operating temperature.
2.
Check idle speed.
Refer to
EC-496, "Idle Speed and Ignition Timing Check"
OK or NG
OK
>> GO TO 10.
NG
>> 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
.
OK or NG
OK
>> GO TO 9.
NG
>> 1.
Repair or replace.
2.
GO TO 4.
9.
CHECK ECM FUNCTION
1.
Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is a rare case.)
2.
Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
SEC-8, "ECM RE-COMMUNICATING FUNCTION : Special Repair Requirement"
.
>> GO TO 4.
10.
CHECK IGNITION TIMING
1.
Run engine at idle.
2.
Check ignition timing with a timing light.
Refer to
EC-496, "Idle Speed and Ignition Timing Check"
OK or NG
OK
>> GO TO 19.
NG
>> GO TO 11.
11.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1.
Stop engine.
2.
EC-497, "Accelerator Pedal Released Position Learning"
>> GO TO 12.
12.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform
EC-497, "Throttle Valve Closed Position Learning"
.
>> GO TO 13.
13.
PERFORM IDLE AIR VOLUME LEARNING
EC-497, "Idle Air Volume Learning"
Is Idle Air Volume Learning carried out successfully?
Yes or No
Yes
>> GO TO 14.
No
>> 1.
Follow the instruction of Idle Air Volume Learning.
650
±
50 rpm (in P or N position)
15
±
5
°
BTDC (in P or N position)
BBIA0379E
INSPECTION AND ADJUSTMENT
EC-495
< BASIC INSPECTION >
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2.
GO TO 4.
14.
CHECK TARGET IDLE SPEED AGAIN
With CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Read idle speed in “DATA MONITOR” mode with CONSULT-III.
Refer to
EC-496, "Idle Speed and Ignition Timing Check"
Without CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Check idle speed.
Refer to
EC-496, "Idle Speed and Ignition Timing Check"
OK or NG
OK
>> GO TO 15.
NG
>> GO TO 17.
15.
CHECK IGNITION TIMING AGAIN
1.
Run engine at idle.
2.
Check ignition timing with a timing light.
Refer to
EC-496, "Idle Speed and Ignition Timing Check"
OK or NG
OK
>> GO TO 19.
NG
>> GO TO 16.
16.
CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to
EM-185, "Removal and Installation"
OK or NG
OK
>> GO TO 17.
NG
>> 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
.
OK or NG
OK
>> GO TO 18.
NG
>> 1.
Repair or replace.
2.
GO TO 4.
18.
CHECK ECM FUNCTION
1.
Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is a rare case.)
2.
Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
SEC-8, "ECM RE-COMMUNICATING FUNCTION : Special Repair Requirement"
.
>> GO TO 4.
19.
INSPECTION END
650
±
50 rpm (in P or N position)
650
±
50 rpm (in P or N position)
15
±
5
°
BTDC (in P or N position)
BBIA0379E
EC-496
< BASIC INSPECTION >
[VK56DE]
INSPECTION AND ADJUSTMENT
Did you replace ECM, referring this Basic Inspection procedure?
Yes or No
Yes
>> 1.
2.
INSPECTION END
No
>> INSPECTION END
Idle Speed and Ignition Timing Check
INFOID:0000000001537595
IDLE SPEED
With CONSULT-III
Check idle speed in “DATA MONITOR” mode with CONSULT-III.
With GST
Check idle speed with GST.
IGNITION TIMING
1.
Attach timing light to loop wire as shown.
2.
Check ignition timing.
Procedure After Replacing ECM
INFOID:0000000001537596
When replacing ECM, the following procedure must be performed.
1.
Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs.
Refer to
SEC-8, "ECM RE-COMMUNICATING FUNCTION : Special Repair Requirement"
.
2.
3.
EC-497, "Accelerator Pedal Released Position Learning"
4.
EC-497, "Throttle Valve Closed Position Learning"
5.
EC-497, "Idle Air Volume Learning"
.
VIN Registration
INFOID:0000000001537597
DESCRIPTION
VIN Registration is an operation to registering VIN in ECM. It must be performed each time ECM is replaced.
NOTE:
Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).
OPERATION PROCEDURE
BBIA0377E
BBIA0379E
INSPECTION AND ADJUSTMENT
EC-497
< BASIC INSPECTION >
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With CONSULT-III
1.
Check the VIN of the vehicle and note it. Refer to
GI-33, "Identification Number"
.
2.
Turn ignition switch ON and engine stopped.
3.
Select “VIN REGISTRATION” in “WORK SUPPORT” mode.
4.
Follow the instruction of CONSULT-III display.
Accelerator Pedal Released Position Learning
INFOID:0000000001537598
DESCRIPTION
Accelerator Pedal Released Position Learning is an operation to learn the fully released position of the accel-
erator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time
harness connector of accelerator pedal position sensor or ECM is disconnected.
OPERATION PROCEDURE
1.
Make sure that accelerator pedal is fully released.
2.
Turn ignition switch ON and wait at least 2 seconds.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Turn ignition switch ON and wait at least 2 seconds.
5.
Turn ignition switch OFF and wait at least 10 seconds.
Throttle Valve Closed Position Learning
INFOID:0000000001537599
DESCRIPTION
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.
OPERATION PROCEDURE
1.
Make sure that accelerator pedal is fully released.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.
Idle Air Volume Learning
INFOID:0000000001537601
DESCRIPTION
Idle Air Volume Learning is an operation to learn the idle air volume that keeps each engine within the specific
range. It must be performed under any of the following conditions:
• Each time electric throttle control actuator or ECM is replaced.
• Idle speed or ignition timing is out of specification.
PREPARATION
Before performing Idle Air Volume Learning, make sure 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 12.9V (At idle)
• Engine coolant temperature: 70 - 100
°
C (158 - 212
°
F)
• Park/neutral position (PNP) switch: ON
• Electric load switch: OFF
(Air conditioner, headlamp)
On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is
start the headlamp will not be illuminated.
• Steering wheel: Neutral (Straight-ahead position)
• Vehicle speed: Stopped
• Transmission: Warmed-up
- With CONSULT-III: Drive vehicle until “ATF TEMP SE 1” in “DATA MONITOR” mode of “A/T” system indi-
cates less than 0.9V.
- Without CONSULT-III: Drive vehicle for 10 minutes.
OPERATION PROCEDURE
EC-498
< BASIC INSPECTION >
[VK56DE]
INSPECTION AND ADJUSTMENT
With CONSULT-III
1.
EC-497, "Accelerator Pedal Released Position Learning"
2.
EC-497, "Throttle Valve Closed Position Learning"
3.
Start engine and warm it up to normal operating temperature.
4.
Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.
5.
Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
6.
Touch “START” and wait 20 seconds.
7.
Make sure that “CMPLT” is displayed on CONSULT-III screen. If “CMPLT” is not displayed, Idle Air Vol-
ume Learning will not be carried out successfully. In this case, find the cause of the incident by referring to
the DIAGNOSTIC PROCEDURE below.
8.
Rev up the engine two or three times and make sure that idle speed and ignition timing are within the
specifications.
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.
EC-497, "Accelerator Pedal Released Position Learning"
2.
EC-497, "Throttle Valve Closed Position Learning"
3.
Start engine and warm it up to normal operating temperature.
4.
Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.
5.
Turn ignition switch OFF and wait at least 10 seconds.
6.
Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
7.
Repeat the following procedure quickly five times within 5 seconds.
a.
Fully depress the accelerator pedal.
b.
Fully release the accelerator pedal.
8.
Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops
blinking and turned ON.
9.
Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
10. Start engine and let it idle.
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the
specifications.
ITEM
SPECIFICATION
Idle speed
650
±
50 rpm (in P or N position)
Ignition timing
15
±
5
°
BTDC (in P or N position)
ITEM
SPECIFICATION
Idle speed
650
±
50 rpm (in P or N position)
Ignition timing
15
±
5
°
BTDC (in P or N position)
SEC897C
INSPECTION AND ADJUSTMENT
EC-499
< BASIC INSPECTION >
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13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried
out successfully. In this case, find the cause of the incident by referring to the DIAGNOSTIC PROCE-
DURE below.
DIAGNOSTIC PROCEDURE
If idle air volume learning cannot be performed successfully, proceed as follows:
1.
Check that throttle valve is fully closed.
2.
Check PCV valve operation.
3.
Check that downstream of throttle valve is free from air leakage.
4.
When the above three items check out OK, engine component parts and their installation condi-
tion are questionable. Check and eliminate the cause of the incident.
It is useful to perform
.
5.
If any of the following conditions occur after the engine has started, eliminate the cause of the
incident and perform Idle Air Volume Learning all over again:
• Engine stalls.
• Erroneous idle.
EC-500
< FUNCTION DIAGNOSIS >
[VK56DE]
ENGINE CONTROL SYSTEM
FUNCTION DIAGNOSIS
ENGINE CONTROL SYSTEM
System Diagram
INFOID:0000000001537602
PBIB3638E
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