Nissan Altima L32. Manual - 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 

GI-22, "Identifica-

tion Number - Sedan"

.

>> 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

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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 

EC-29, "ACCELERATOR PEDAL

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 

EC-29, "ACCELERATOR PEDAL

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

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[QR25DE FOR CALIFORNIA]

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Fully depress the accelerator pedal.

-

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 

EC-136, "Description"

.

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

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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