Nissan Altima (L32) 2007-2012 Service Manual: Idle air volume learning

 Description

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 the electric throttle control actuator or ECM is replaced.

• Idle speed or ignition timing is out of the specification.

Special Repair Requirement

1.PRECONDITIONING

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 position: P or N

• Electric load switch: OFF (Air conditioner, head lamp, rear window defogger) On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is started the head lamp will not illuminate.

• 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 indicates less than 0.9 V.

• Without CONSULT-III: Drive vehicle for 10 minutes.

- M/T models

• Drive vehicle for 10 minutes.

Will CONSULT-III be used? YES >> GO TO 2.

NO >> GO TO 3.

2.PERFORM IDLE AIR VOLUME LEARNING

1. Perform EC-1053, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement".

2. Perform EC-1053, "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.

Is “CMPLT” displayed on CONSULT-III screen? YES >> GO TO 4.

NO >> GO TO 5.

3.PERFORM IDLE AIR VOLUME LEARNING

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-1053, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement".

2. Perform EC-1053, "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 MIL stops blinking and turns ON.

8. Fully release the accelerator pedal within 3 seconds after the MIL 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 two or 3 times and check that idle speed and ignition timing are within the specifications.

For procedure, refer to EC-1052, "IDLE SPEED : Special Repair Requirement" and EC-1052, "IGNITION TIMING : Special Repair Requirement".

For specifications, refer to EC-1585, "Idle Speed" and EC-1585, "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

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-1167, "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 again: • Engine stalls.

• Incorrect idle.

>> INSPECTION END