Nissan Murano: Basic Inspection / 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.

For details, refer to Work Procedure.

Work Procedure (Before Replacing Electric Throttle Control Actuator)

CHECK DTC

Perform DTC P0101 confirmation procedure. Refer to DTC Description.

Is the DTC P0101 displayed?

GO TO 2.

• Replace electric throttle control actuator. Refer to Removal and Installation.

• After replacing electric throttle control actuator, perform necessary work.

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

• Electric load switch: OFF

  (Air conditioner, headlamp, rear window defogger)

  On Nissan Murano 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)

• Nissan Murano Vehicle speed: Stopped

• Transmission: Warmed-up

• With CONSULT: Drive vehicle until “ATF TEMP SEN” in “DATA MONITOR” mode of “CVT” system indicates less than 0.9 V.

• Without CONSULT: Drive Nissan Murano vehicle for 10 minutes.

GO TO 3.

IDLE AIR VOLUME LEARNING

With CONSULT

1. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING. Refer to Description.

2. Perform THROTTLE VALVE CLOSED POSITION LEARNING. Refer to Description.

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?

• Replace electric throttle control actuator. Refer to Removal and Installation.

• After replacing electric throttle control actuator, perform necessary work.

Retry from step 2.

Work Procedure (After Replacing Electric Throttle Control Actuator)

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 Nissan Murano 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)

• Nissan Murano Vehicle speed: Stopped

• Transmission: Warmed-up

  • With CONSULT: Drive vehicle until “ATF TEMP SEN” in “DATA MONITOR” mode of “CVT” system indicates less than 0.9 V.

  • Without CONSULT: Drive Nissan Murano vehicle for 10 minutes.

GO TO 2.

PERFORM IDLE AIR VOLUME LEARNING

With CONSULT

1. Perform Accelerator Pedal Released Position Learning. Refer to Description.

2. Perform Throttle Valve Closed Position Learning. Refer to Description.

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 screen?

GO TO 3.

GO TO 4.

CHECK IDLE SPEED AND IGNITION TIMING

Rev up the engine 2 or 3 times and check that idle speed and ignition timing are within the specifications.

For procedure, refer to Work Procedure and Work Procedure.

For specifications, refer to Idle Speed and Ignition Timing.

Is the inspection result normal?

INSPECTION END

GO TO 4.

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?

GO TO 5.

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 Diagnosis Procedure.

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