Infiniti FX35 / FX45. Manual - part 467

POSITIVE CRANKCASE VENTILATION

EC-629

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POSITIVE CRANKCASE VENTILATION

Description

INFOID:0000000001326507

SYSTEM DESCRIPTION

This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conductcrankcase blow-by gas to the intake
manifold.
During partial throttle operation of the engine, the intake manifoldsucks the blow-by gas through the PCV
valve.
Normally, the capacity of the valve is sufficient to handle any blow-byand a small amount of ventilating air.
The ventilating air is then drawn from the air inlet tubes into thecrankcase. In this process the air passes
through the hose connecting airinlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient todraw the blow-by flow through the valve. The
flow goes through the hose connectionin the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meetthe requirement. This is because some of the flow will go
through the hoseconnection to the air inlet tubes under all condi-
tions.

Component Inspection

INFOID:0000000001326508

PCV (POSITIVE CRANKCASE VENTILATION) VALVE

PBIB0062E

PBIB1588E

EC-630

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POSITIVE CRANKCASE VENTILATION

With engine running at idle, remove PCV valve from rocker cover. A
properly working valve makes a hissing noise as air passes through
it. A strong vacuum should be felt immediately when a finger is
placed over valve inlet.

PCV VALVE VENTILATION HOSE

1.

Check hoses and hose connections for leaks.

2.

Disconnect all hoses and clean with compressed air. If any
hosecannot be freed of obstructions, replace.

PBIB1589E

S-ET277

IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)

EC-631

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IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)

Description

INFOID:0000000001326509

• If the security indicator lights up with the ignition switch in the ON position or “NATS MALFUNC-

TION” is displayed on “SELF-DIAG RESULTS” screen, perform self-diagnostic results mode with
CONSULT-III using NATS program card. Refer to 

BL-185

.

• Confirm no self-diagnostic results of IVIS (NATS) is displayed before touching “ERASE” in “SELF-

DIAG RESULTS” mode with CONSULT-III.

• When replacing ECM, initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition

key IDs must be carried out with CONSULT-III using NATS program card.
Therefore, be sure to receive all keys from vehicle owner. Regarding the procedures of IVIS (NATS)
initialization and all IVIS (NATS) ignition key ID registration, refer to CONSULT-III operation manual,
IVIS/NVIS.

EC-632

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ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Introduction

INFOID:0000000001326510

The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:

The above information can be checked using procedures listed in the table below.

×

: Applicable

—: Not applicable

*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.

The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected
in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to 

EC-671,

"Fail-Safe Chart"

.)

Two Trip Detection Logic

INFOID:0000000001326511

When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MIL will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd
trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.

×

: Applicable

—: Not applicable

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is
malfunction on engine control system.

Emission-related diagnostic information

Diagnostic service

Diagnostic Trouble Code (DTC)

Service $03 of SAE J1979

Freeze Frame data

Service $02 of SAE J1979

System Readiness Test (SRT) code

Service $01 of SAE J1979

1st Trip Diagnostic Trouble Code (1st Trip DTC)

Service $07 of SAE J1979

1st Trip Freeze Frame data

Test values and Test limits

Service $06 of SAE J1979

Calibration ID

Service $09 of SAE J1979

DTC

1st trip DTC

Freeze 

Frame data

1st trip Freeze 

Frame data

SRT code

SRT status

Test value

CONSULT-III

×

×

×

×

×

×

—

GST

×

×

×

—

×

×

×

ECM

×

×

*

—

—

—

×

—

Items

MIL

DTC

1st trip DTC

1st trip

2nd trip 

1st trip 

displaying

2nd trip 

displaying

1st trip 

displaying

2nd trip 

display-

ing

Blinking

Lighting 

up

Blinking

Lighting 

up

Misfire (Possible three way catalyst 
damage) — DTC: P0300 - P0308 is 
being detected

×

—

—

—

—

—

×

—

Misfire (Possible three way catalyst 
damage) — DTC: P0300 - P0308 is 
being detected

—

—

×

—

—

×

—

—

One trip detection diagnoses (Re-
fer to 

EC-633, "Emission-related 

Diagnostic Information"

.)

—

×

—

—

×

—

—

—

Except above

—

—

—

×

—

×

×

—