Nissan X-Trail 32. Manual - part 754

THROTTLE VALVE CLOSED POSITION LEARNING

EC-145

< BASIC INSPECTION >

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THROTTLE VALVE CLOSED POSITION LEARNING

Description

INFOID:0000000010775082

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 the harness con-
nector of the electric throttle control actuator or ECM is disconnected or electric throttle control actuator inside
is cleaned.

Work Procedure

INFOID:0000000010775083

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.
Check that throttle valve moves during the above 10 seconds by confirming the operating sound.

>> END

EC-146

< BASIC INSPECTION >

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IDLE AIR VOLUME LEARNING

IDLE AIR VOLUME LEARNING

Description

INFOID:0000000010775084

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 electric throttle control actuator or ECM is replaced.
• Idle speed or ignition timing is out of specification.

Work Procedure

INFOID:0000000010775085

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: P or N (CVT), Neutral (M/T)
• Electric load switch: OFF

(Air conditioner, headlamp, rear window defogger)

• Steering wheel: Neutral (Straight-ahead position) position
• Vehicle speed: Stopped
• Transmission: Warmed-up (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-144, "Work Proce-

dure"

.

2.

Perform “THROTTLE VALVE CLOSED POSITION LEARNING”. Refer to 

EC-145, "Work Procedure"

.

3.

Start engine and warm it up to normal operating temperature.

4.

Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode of “ENGINE” using 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 mal-

function.

1.

Perform “ACCELERATOR PEDAL RELEASED POSITION LEARNING”. Refer to 

EC-144, "Work Proce-

dure"

.

2.

Perform “THROTTLE VALVE CLOSED POSITION LEARNING”. Refer to 

EC-145, "Work Procedure"

.

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.

IDLE AIR VOLUME LEARNING

EC-147

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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-431, "Idle Speed"

 and 

EC-431, "Ignition Timing"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART-1

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-2

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-154, "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

SEC897C

EC-148

< BASIC INSPECTION >

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MIXTURE RATIO SELF-LEARNING VALUE CLEAR

MIXTURE RATIO SELF-LEARNING VALUE CLEAR

Description

INFOID:0000000010775086

This describes how to erase the mixture ratio self-learning value. For the actual procedure, follow the instruc-
tions in “Diagnosis Procedure”.

Work Procedure

INFOID:0000000010775087

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”.

Without CONSULT

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.

Check DTC. Make sure DTC P0102 is detected.

7.

Erase the DTC P0102. Refer to 

EC-79, "On Board Diagnosis Function"

.

8.

Check DTC. Make sure DTC P0000 is detected.

>> END