Infiniti G35 (V35) Sedan. Manual - part 468

EC-18

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INSPECTION AND ADJUSTMENT

>> END

THROTTLE VALVE CLOSED POSITION LEARNING

THROTTLE VALVE CLOSED POSITION LEARNING : Description

INFOID:0000000000956470

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:0000000000956471

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.
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:0000000000956472

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.
• Idle speed or ignition timing is out of specification.

IDLE AIR VOLUME LEARNING : Special Repair Requirement

INFOID:0000000000956473

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-17, "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"

.

INSPECTION AND ADJUSTMENT

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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-17, "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

Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifi-
cations.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART-I

Check the following

SEC897C

ITEM

SPECIFICATION

Idle speed

A/T: 650 

±

 50 rpm (in P or N position)

M/T: 650 

±

 50 rpm (in Neutral position)

Ignition timing

A/T with 4WAS: 11 

±

 5

°

 BTDC (in P or N position)

A/T without 4WAS: 15 

±

 5

°

 BTDC (in P or N position)

M/T with 4WAS: 11 

±

 5

°

 BTDC (in Neutral position)

M/T without 4WAS: 15 

±

 5

°

 BTDC (in Neutral position)

EC-20

< BASIC INSPECTION >

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INSPECTION AND ADJUSTMENT

• 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-125, "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

EXHAUST VALVE TIMING CONTROL LEARNING

EXHAUST VALVE TIMING CONTROL LEARNING : Description

INFOID:0000000000956474

Exhaust Valve Timing Control Learning is a function of ECM to learn the characteristic of exhaust valve timing
control magnet retarder by comparing the target angle of exhaust camshaft with the actual retarded angle of
exhaust camshaft. It must be performed each time exhaust valve timing control magnet retarder is discon-
nected or replaced, or ECM is replaced.

EXHAUST VALVE TIMING CONTROL LEARNING : Special Repair Requirement

INFOID:0000000000956475

1.

START

 With CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Set selector lever to N position (A/T) or neutral position (M/T) and confirm that following electrical or
mechanical loads are not applied.

-

Headlamp switch is OFF

-

Air conditioner switch is OFF

-

Rear defogger switch is OFF

-

Steering wheel is in the straight-ahead position, etc.

3.

Keep the engine speed between 1,800 and 2,000 rpm.

4.

Select “EXH V/T CONTROL LEARN” in “WORK SUPPORT” mode with CONSULT-III.

5.

Touch “START” and wait 20 seconds.

6.

Make sure that “CMPLT” is displayed on CONSULT-III screen.

 Without CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Set selector lever to N position (A/T) or neutral position (M/T) and confirm that following electrical or
mechanical loads are not applied.

-

Headlamp switch is OFF

-

Air conditioner switch is OFF

-

Rear defogger switch is OFF

-

Steering wheel is in the straight-ahead position, etc.

3.

Keep the engine speed between 1,800 and 2,000 rpm at 20 seconds.

>> END

MIXTURE RATIO SELF-LEARNING VALUE CLEAR

Learning completed

: CMPLT

Learning not yet

: YET

INSPECTION AND ADJUSTMENT

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MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Description

INFOID:0000000000956476

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

MIXTURE RATIO SELF-LEARNING VALUE CLEAR : Special Repair Requirement

INFOID:0000000000956477

1.

START

 With CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-III.

3.

Clear mixture ratio self-learning value by touching “CLEAR”.

 With GST

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF.

3.

Disconnect mass air flow sensor (bank 1) harness connector.

4.

Restart engine and let it idle for at least 5 seconds.

5.

Stop engine and reconnect mass air flow sensor (bank 1) harness connector.

6.

Select Service $03 with GST. Make sure DTC P0102 is detected.

7.

Select Service $04 with GST to erase the DTC P0102.

>> END