Nissan Note E12. Manual — part 194

IDLE AIR VOLUME LEARNING

EC-115

< BASIC INSPECTION >

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IDLE AIR VOLUME LEARNING

Description

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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

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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 12.9 V (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)

- For vehicles equipped with daytime light systems, perform one of the following procedures before

starting engine not to illuminate headlamps.

• Apply parking brake

• Set lighting switch to the 1st position

• Steering wheel: Neutral (Straight-ahead position) position

• Vehicle speed: Stopped

• Transmission: Warmed-up

- CVT models

• With CONSULT: Drive vehicle until “FLUID TEMP SE” in “DATA MONITOR” mode of “TRANSMISSION” sys-

tem indicates less than 0.9 V.

• Without CONSULT: Drive vehicle for 10 minutes.

- M/T models

• Drive vehicle for 10 minutes.
Do you have CONSULT?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

IDLE AIR VOLUME LEARNING

With CONSULT

1. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING. Refer to

EC-113, "Work Proce-

dure"

.

2. Perform THROTTLE VALVE CLOSED POSITION LEARNING. Refer to

EC-114, "Work Procedure"

.

3. Start engine and warm it up to normal operating temperature.

4. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode with CONSULT.

5. 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.

1. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING. Refer to

EC-113, "Work Proce-

dure"

.

2. Perform THROTTLE VALVE CLOSED POSITION LEARNING. Refer to

EC-114, "Work Procedure"

.

3. Start engine and warm it up to normal operating temperature.

4. Turn ignition switch OFF and wait at least 10 seconds.

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IDLE AIR VOLUME LEARNING

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.

>> 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.

For specification, refer to

EC-339, "Idle Speed"

and

EC-339, "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-129, "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

PBIB0665E

MIXTURE RATIO SELF-LEARNING VALUE CLEAR

EC-117

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MIXTURE RATIO SELF-LEARNING VALUE CLEAR

Description

INFOID:0000000009022488

This describes how to erase the mixture ratio self-learning value. For the actual procedure, follow the instruc-

tions in “Diagnosis Procedure”.

Work Procedure

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1.

START

With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.

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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BASIC INSPECTION

Work Procedure

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1.

INSPECTION START

1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for

scheduled maintenance.

2. Open engine hood and check the following:

-

Harness connectors for improper connections

-

Wiring harness for improper connections, pinches and cut

-

Vacuum hoses for splits, kinks and improper connections

-

Hoses and ducts for leaks

-

Air cleaner clogging

-

Gasket

3. Confirm that electrical or mechanical loads are not applied.

-

Headlamp switch is OFF.

-

Air conditioner switch is OFF.

-

Rear window defogger switch is OFF.

-

Steering wheel is in the straight-ahead position, etc.

4. Start engine and warm it up until engine coolant temperature

indicator points to the middle of gauge.

Ensure engine stays below 1,000 rpm.

5. Run engine at about 2,000 rpm for about 2 minutes under no

load.

6. Make sure that no DTC is displayed with CONSULT or GST.
Is any DTC detected?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

REPAIR OR REPLACE

Repair or replace components as necessary according to corresponding Diagnostic Procedure.

>> GO TO 3

3.

CHECK TARGET IDLE SPEED

1. Run engine at about 2,000 rpm for about 2 minutes under no load.

SEF983U

SEF976U

SEF977U