Infiniti G37 Coupe. Manual - part 459

INSPECTION AND ADJUSTMENT

EC-17

< BASIC INSPECTION >

[VQ37VHR]

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ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL
MODULE)

ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL 
MODULE) : Description

INFOID:0000000001830660

When replacing VVEL control module, this procedure must be performed.

ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL 
MODULE) : Special Repair Requirement

INFOID:0000000001830661

1.

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-19, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

.

>> END

IDLE SPEED

IDLE SPEED : Description

INFOID:0000000001733911

This describes how to check the idle speed. For the actual procedure, follow the instructions in “BASIC
INSPECTION”.

IDLE SPEED : Special Repair Requirement

INFOID:0000000001733912

1.

CHECK IDLE SPEED

With CONSULT-III

Check idle speed in “DATA MONITOR” mode with CONSULT-III.

With GST

Check idle speed with Service $01 of GST.

>> INSPECTION END

IGNITION TIMING

IGNITION TIMING : Description

INFOID:0000000001733913

This describes how to check the ignition timing. For the actual procedure, follow the instructions in “BASIC
INSPECTION”.

IGNITION TIMING : Special Repair Requirement

INFOID:0000000001733914

1.

CHECK IGNITION TIMING

1.

Attach timing light to loop wire as shown.

1.

Loop wire

A.

Timing light

B.

Timing indicator

JMBIA0846ZZ

EC-18

< BASIC INSPECTION >

[VQ37VHR]

INSPECTION AND ADJUSTMENT

2.

Check ignition timing.

>> INSPECTION END

VIN REGISTRATION

VIN REGISTRATION : Description

INFOID:0000000001733915

VIN Registration is an operation to registering VIN in ECM. It must be performed each time ECM is replaced.
NOTE:
Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).

VIN REGISTRATION : Special Repair Requirement

INFOID:0000000001733916

1.

CHECK VIN

Check the VIN of the vehicle and note it. Refer to 

GI-20, "Information About Identification or Model Code"

.

>> GO TO 2.

2.

PERFORM VIN REGISTRATION

With CONSULT-III

1.

Turn ignition switch ON and engine stopped.

2.

Select “VIN REGISTRATION” in “WORK SUPPORT” mode.

3.

Follow the instruction of CONSULT-III display.

>> END

ACCELERATOR PEDAL RELEASED POSITION LEARNING

ACCELERATOR PEDAL RELEASED POSITION LEARNING : Description

INFOID:0000000001733917

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 harness connector of accelerator pedal position sensor or ECM is disconnected.

ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Re-
quirement

INFOID:0000000001733918

1.

START

1.

Make sure 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

THROTTLE VALVE CLOSED POSITION LEARNING : Description

INFOID:0000000001733919

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 harness connec-
tor of electric throttle control actuator or ECM is disconnected.

THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement

INFOID:0000000001733920

1.

START

1.

Make sure that accelerator pedal is fully released.

INSPECTION AND ADJUSTMENT

EC-19

< BASIC INSPECTION >

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2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.

>> END

IDLE AIR VOLUME LEARNING

IDLE AIR VOLUME LEARNING : Description

INFOID:0000000001733921

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 any of the following conditions:
• Each time electric throttle control actuator or ECM is replaced.
• Each time VVEL actuator sub assembly or VVEL control module is replaced.
• Idle speed or ignition timing is out of specification.

IDLE AIR VOLUME LEARNING : Special Repair Requirement

INFOID:0000000001733922

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 12.9V (At idle)
• Engine coolant temperature: 70 - 105

°

C (158 - 221

°

F)

• PNP switch: ON
• 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 be illuminated.

• Steering wheel: Neutral (Straight-ahead position)
• Vehicle speed: Stopped
• Transmission: Warmed-up
- A/T models
• With CONSULT-III: Drive vehicle until “ATF TEMP SE 1” in “DATA MONITOR” mode of “A/T” system indi-

cates less than 0.9V.

• 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.

PERFORM IDLE AIR VOLUME LEARNING

With CONSULT-III

1.

Perform Accelerator Pedal Released Position Learning. Refer to 

EC-18, "ACCELERATOR PEDAL

RELEASED POSITION LEARNING : Special Repair Requirement"

.

2.

Perform Throttle Valve Closed Position Learning. 

EC-18, "THROTTLE VALVE CLOSED POSITION

LEARNING : Special Repair Requirement"

.

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.

EC-20

< BASIC INSPECTION >

[VQ37VHR]

INSPECTION AND ADJUSTMENT

1.

Perform Accelerator Pedal Released Position Learning. Refer to 

EC-18, "ACCELERATOR PEDAL

RELEASED POSITION LEARNING : Special Repair Requirement"

.

2.

Perform Throttle Valve Closed Position Learning. 

EC-18, "THROTTLE VALVE CLOSED POSITION

LEARNING : Special Repair Requirement"

.

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

1.

Start engine and warm it up to normal operating temperature.

2.

Let it idle for 20 seconds.

3.

Rev up the engine two or three times and make sure that idle speed and ignition timing are within the
specifications. Refer to 

EC-606, "Idle Speed"

 and 

EC-606, "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-132, "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

VVEL CONTROL SHAFT POSITION SENSOR ADJUSTMENT

SEC897C