IDLE AIR VOLUME LEARNING : Special Repair Requirement

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 - 105°C (158 - 221°F)
- PNP switch: ON
- 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
  - A/T models
- With CONSULT-III: Drive vehicle until "ATF TEMP SE 1" in "DATA MONITOR" mode of "A/T" system indicates 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.
PERFORM IDLE AIR VOLUME LEARNING
With CONSULT-III
1. Perform Accelerator Pedal Released Position Learning. Refer to "ACCELERATOR PEDAL RELEASED POSITION LEARNING : SPECIAL REPAIR REQUIREMENT ".
2. Perform Throttle Valve Closed Position Learning. "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.
PERFORM 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 "ACCELERATOR PEDAL RELEASED POSITION LEARNING : SPECIAL REPAIR REQUIREMENT ".
2. Perform Throttle Valve Closed Position Learning. "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 five times within 5 seconds.
  - 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.
  
  Fig 1: MIL Timing Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
GO TO 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 specifications. Refer to Idle Speed and Ignition Timing .

Is the inspection result normal?

YES: INSPECTION END

NO: GO TO 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.
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 "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