Infiniti QX56 (Z62). Manual - part 542

EC-146

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ACCELERATOR PEDAL RELEASED POSITION LEARNING

ACCELERATOR PEDAL RELEASED POSITION LEARNING

Description

INFOID:0000000006217746

Accelerator Pedal Released Position Learning is a function of ECM to learn the fully released position of the
accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each
time the harness connector of the accelerator pedal position sensor or ECM is disconnected.

Work Procedure

INFOID:0000000006217747

1.

START

1.

Check that accelerator pedal is fully released.

2.

Turn ignition switch ON and wait at least 2 seconds.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Turn ignition switch ON and wait at least 2 seconds.

5.

Turn ignition switch OFF and wait at least 10 seconds.

>> END

THROTTLE VALVE CLOSED POSITION LEARNING

EC-147

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THROTTLE VALVE CLOSED POSITION LEARNING

Description

INFOID:0000000006217748

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:0000000006217749

1.

START

 WITH CONSULT-III

1.

Turn ignition switch ON.

2.

Select “CLSD THL POS LEARN” in “WORK SUPPORT” mode.

3.

Follow the instructions on the CONSULT-III display.

4.

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.

 WITHOUT CONSULT-III

1.

Start the engine.
NOTE:
Engine coolant temperature is 25

°

C (77

°

F) or less before engine starts.

2.

Warm up the engine.
NOTE:
Raise engine coolant temperature until it reaches 65

°

C (149

°

F) or more.

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-148

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IDLE AIR VOLUME LEARNING

IDLE AIR VOLUME LEARNING

Description

INFOID:0000000006217750

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.

Work Procedure

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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 - 105

°

C (158 - 221

°

F)

• Selector lever position: P or N
• Electric load switch: OFF

(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is
started the headlamp will not illuminate.

• Steering wheel: Neutral (Straight-ahead position)
• Vehicle speed: Stopped
• Transmission: Warmed-up
- With CONSULT-III: Drive vehicle until “ATF TEMP 2” in “DATA MONITOR” mode of “A/T” system indicates

less than 0.9 V.

- Without CONSULT-III: Drive vehicle for 10 minutes.

Will CONSULT-III be used?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

PERFORM IDLE AIR VOLUME LEARNING

 WITH CONSULT-III

1.

Perform Accelerator Pedal Released Position Learning. Refer to 

EC-146, "Work Procedure"

.

2.

Perform Throttle Valve Closed Position Learning. 

EC-147, "Work Procedure"

.

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-III screen?

YES

>> GO TO 4.

NO

>> GO TO 5.

3.

PERFORM 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-146, "Work Procedure"

.

2.

Perform Throttle Valve Closed Position Learning. 

EC-147, "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 5 times within 5 seconds.

-

Fully depress the accelerator pedal.

-

Fully release the accelerator pedal.

7.

Wait 7 seconds, fully depress the accelerator pedal for approx. 20 seconds until the MIL stops blinking
and turns ON.

8.

Fully release the accelerator pedal within 3 seconds after the MIL turns ON.

IDLE AIR VOLUME LEARNING

EC-149

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9.

Start engine and let it idle.

10. Wait 20 seconds.

>> GO TO 4.

4.

CHECK IDLE SPEED AND IGNITION TIMING

Rev up engine two or three times and check that idle speed and ignition timing are within the specifications.
For procedure, refer to 

EC-530, "Inspection"

 and 

EC-531, "Inspection"

.

For specifications, refer to 

EC-538, "Idle Speed"

 and 

EC-538, "Ignition Timing"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 5.

5.

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?

YES

>> GO TO 6.

NO

>> Repair or replace malfunctioning part.

6.

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 

EC-161, "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 again:
• Engine stalls.
• Incorrect idle.

>> INSPECTION END

SEC897C