Nissan Juke Service and Repair 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 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) 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 - CVT models
• With CONSULT-III: Drive vehicle until “ATF TENP SEN” in “DATA MONITOR” mode of “CVT” system indicates less than 0.9 V.
• 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.
2.IDLE AIR VOLUME LEARNING
With CONSULT-III
1. Perform Accelerator Pedal Released Position Learning. Refer to EC-134, "Work Procedure".
2. Perform Throttle Valve Closed Position Learning. Refer to EC-135, "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”.
5. Touch “START” and wait 20 seconds.
Is “CMPLT” displayed on CONSULT-III screen? YES >> GO TO 4.
3.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 EC-134, "Work Procedure".
2. Perform Throttle Valve Closed Position Learning. Refer to EC-135, "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.
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 specifications.
For specification, refer to EC-449, "Idle Speed" and EC-449, "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 toEC-147, "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
Throttle valve closed position
learning
Description
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 ...
G sensor calibration
Description
ECM stores calibration data (inherent characteristic value) of G sensor to
provide accurate control. Therefore,
it is required to perform calibration of G sensor after the following wo ...
Other materials:
B26F8 BCM
DTC Logic
DTC DETECTION LOGIC
NOTE:
DTC B26F8 can be detected even though the related circuit is not used in this
vehicle.
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait 1 second.
2. Check DTC in “Self Diagnostic Result” mode of “BCM” u ...
4WD warning lamp blinks slowly
Description
4WD warning lamp blinks at approximately 2 seconds intervals while driving.
Diagnosis Procedure
1.CHECK TIRE
Check the following.
• Tire pressure
• Wear condition
• Front and rear tire size (There is no difference between front and rear
tires.)
Is the inspection result normal ...
P0087, P0088, P0090 FRP control system
DTC Logic
DTC DETECTION LOGIC
NOTE:
• If DTC P0087 or P0090 is displayed with DTC P1197, first perform the trouble
diagnosis for DTC
P1197.
• DTC P0087 or P0090 may be displayed when running out of gas.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been p ...