Nissan Sentra Service Manual: Idle air volume learning
Description
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.
Work Procedure
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 11.6 V (At idle)
- Engine coolant temperature: 70 - 100В°C (158 - 212В°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 running light systems, set lighting
switch to the 1st position to
light only small lamps.
- Steering wheel: Neutral (Straight-ahead position)
- Vehicle speed: Stopped
- Transmission: Warmed-up
- With CONSULT: Drive vehicle until “ATF TENP SEN” in “DATA MONITOR” mode
of “CVT” system indicates
less than 0.9 V.
- Without CONSULT: Drive vehicle for 10 minutes.
- Drive vehicle for 10 minutes.
Do you have CONSULT?
YES >> GO TO 2.
NO >> GO TO 3.
2.IDLE AIR VOLUME LEARNING
With CONSULT
- Perform Accelerator Pedal Released Position Learning. Refer to EC-138,
"Work Procedure".
- Perform Throttle Valve Closed Position Learning. Refer to EC-139, "Work
Procedure".
- Start engine and warm it up to normal operating temperature.
- Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode of “ENGINE”.
- Touch “START” and wait 20 seconds.
Is “CMPLT” displayed on CONSULT screen?
YES >> GO TO 4.
NO >> GO TO 5.
3.IDLE AIR VOLUME LEARNING
Without CONSULT
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.
- Perform Accelerator Pedal Released Position Learning. Refer to EC-138,
"Work Procedure".
- Perform Throttle Valve Closed Position Learning. Refer to EC-139, "Work
Procedure".
- Start engine and warm it up to normal operating temperature.
- Turn ignition switch OFF and wait at least 10 seconds.
- Confirm that accelerator pedal is fully released, turn ignition switch
ON and wait 3 seconds.
- Repeat the following procedure quickly five times within 5 seconds.
- Fully depress the accelerator pedal.
- Fully release the accelerator pedal.
- Wait 7 seconds, fully depress the accelerator pedal and keep it for
approximately 20 seconds until the MIL
stops blinking and turned ON.
- Fully release the accelerator pedal within 3 seconds after the MIL
turned ON.
- Start engine and let it idle.
- 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 specifications.
For specification, refer to EC-486, "Idle Speed" and EC-486, "Ignition Timing".
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5.
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-157, "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
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