Nissan Altima L32. Instruction — part 227
INSPECTION AND ADJUSTMENT
EC-29
< BASIC INSPECTION >
[QR25DE FOR CALIFORNIA]
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VIN REGISTRATION : Special Repair Requirement
INFOID:0000000004349134
1.
CHECK VIN
Check the VIN of the vehicle and note it. Refer to
GI-23, "Identification Number - Coupe"
or
>> GO TO 2.
2.
PERFORM VIN REGISTRATION
With CONSULT-III
1. Turn ignition switch ON and engine stopped.
2. Select “VIN REGISTRATION” in “WORK SUPPORT” mode.
3. Follow the instruction of CONSULT-III display.
>> END
ACCELERATOR PEDAL RELEASED POSITION LEARNING
ACCELERATOR PEDAL RELEASED POSITION LEARNING : Description
INFOID:0000000004349135
Accelerator Pedal Released Position Learning is a function of ECM to learn the fully released position of the
accelerator 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.
ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Re-
quirement
INFOID:0000000004349136
1.
START
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.
>> END
THROTTLE VALVE CLOSED POSITION LEARNING
THROTTLE VALVE CLOSED POSITION LEARNING : Description
INFOID:0000000004349137
Throttle Valve Closed Position Learning is a function of ECM 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 connec-
tor of electric throttle control actuator or ECM is disconnected.
THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement
INFOID:0000000004349138
1.
START
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.
>> END
IDLE AIR VOLUME LEARNING
EC-30
< BASIC INSPECTION >
[QR25DE FOR CALIFORNIA]
INSPECTION AND ADJUSTMENT
IDLE AIR VOLUME LEARNING : Description
INFOID:0000000004349139
Idle Air Volume Learning is a function of ECM to learn the idle air volume that keeps each engine idle speed
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.
IDLE AIR VOLUME LEARNING : Special Repair Requirement
INFOID:0000000004349140
1.
PRECONDITIONING
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)
• Selector lever: P or N (CVT), Neutral (M/T)
• Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is
started the headlamp will not be illuminated.
• Steering wheel: Neutral (Straight-ahead position)
• Vehicle speed: Stopped
• Transmission: Warmed-up
- CVT models
• With CONSULT-III: Drive vehicle until “ATF TEMP SEN” in “DATA MONITOR” mode of “CVT” system indi-
cates less than 0.9V.
• Without CONSULT-III: Drive vehicle for 10 minutes.
- M/T models
• Drive vehicle for 10 minutes.
Do you have CONSULT-III?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
IDLE AIR VOLUME LEARNING
With CONSULT-III
1. Perform Accelerator Pedal Released Position Learning. Refer to
RELEASED POSITION LEARNING : Special Repair Requirement"
2. Perform Throttle Valve Closed Position Learning. Refer to
EC-29, "THROTTLE VALVE CLOSED POSI-
TION 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.
Is “CMPLT” displayed on CONSULT-III screen?
YES
>> GO TO 4.
NO
>> GO TO 5.
3.
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 Accelerator Pedal Released Position Learning. Refer to
RELEASED POSITION LEARNING : Special Repair Requirement"
2. Perform Throttle Valve Closed Position Learning. Refer to
EC-29, "THROTTLE VALVE CLOSED POSI-
TION 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 five times within 5 seconds.
INSPECTION AND ADJUSTMENT
EC-31
< BASIC INSPECTION >
[QR25DE FOR CALIFORNIA]
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Fully depress the accelerator pedal.
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Fully release the accelerator pedal.
7. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops
blinking and turned ON.
8. Fully release the accelerator pedal within 3 seconds after the MIL turned 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 two or three times and make sure that idle speed and ignition timing are within the specifi-
cations.
Is the inspection result normal?
YES
>> INSPECTION END
5.
DETECT MALFUNCTIONING PART
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
Engine component parts and their installation condition are questionable. Check and eliminate the cause of
the incident.
It is useful to perform “TROUBLE DIAGNOSIS - SPECIFICATION VALUE”. Refer to
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.
>> INSPECTION END
MIXTURE RATIO SELF-LEARNING VALUE CLEAR
MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Description
INFOID:0000000004349141
This describes how to erase the mixture ratio self-learning value. For the actual procedure, follow the instruc-
tions in “Diagnosis Procedure”.
SEC897C
ITEM
SPECIFICATION
Idle speed
CVT: 650
± 50 rpm (in P or N position)
M/T: 650
± 50 rpm (in Neutral position)
Ignition timing
CVT: 15
± 5° (in P or N position)
M/T: 15
± 5° (in Neutral position)
EC-32
< BASIC INSPECTION >
[QR25DE FOR CALIFORNIA]
INSPECTION AND ADJUSTMENT
MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Special Repair Requirement
INFOID:0000000004349142
1.
START
With CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-III.
3. Clear mixture ratio self-learning value by touching “CLEAR”.
With GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector.
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness connector.
6. Select Service $03 with GST. Make sure DTC P0102 is detected.
7. Select Service $04 with GST to erase the DTC P0102.
>> END
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