Nissan Pathfinder (2011 year). Instruction — part 251

EC-62

< SYSTEM DESCRIPTION >

[VQ40DE]

FUEL FILLER CAP WARNING SYSTEM

• DTC erased by using CONSULT-III.

NOTE:

MIL turns ON if a malfunction is detected in leak diagnosis results again at the trip after the fuel filler cap warn-

ing display turns ON/OFF.

2011 Pathfinder

VARIABLE INDUCTION AIR SYSTEM

EC-63

< SYSTEM DESCRIPTION >

[VQ40DE]

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VARIABLE INDUCTION AIR SYSTEM

Description

INFOID:0000000006243761

SYSTEM DESCRIPTION

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

When the engine is running at medium speed, the ECM sends the ON signal to the VIAS control solenoid

valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore closes

the power valve.

Under this condition, the effective intake manifold length is equivalent to the total length of passage A and pas-

sage B. This long intake manifold provides increased amount of intake air, which results in improved suction

efficiency and higher torque.

When engine is running at low or high speed, the ECM sends the OFF signal to the VIAS control solenoid

valve and the power valve is opened.

Under this condition, the effective intake manifold length is equivalent to the length of passage B. This short-

ened intake manifold length results in enhanced engine output due to reduced suction resistance under high

speeds.

COMPONENT DESCRIPTION

Power Valve

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

VIAS control

VIAS control solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Battery

Battery voltage*

PBIB1822E

2011 Pathfinder

EC-64

< SYSTEM DESCRIPTION >

[VQ40DE]

VARIABLE INDUCTION AIR SYSTEM

The power valve is installed in intake manifold collector and used to

control the suction passage of the variable induction air control sys-

tem. It is set in the fully closed or fully opened position by the power

valve actuator operated by the vacuum stored in the surge tank. The

vacuum in the surge tank is controlled by the VIAS control solenoid

valve.

VIAS Control Solenoid Valve

The VIAS control solenoid valve cuts the intake manifold vacuum

signal for power valve control. It responds to ON/OFF signals from

the ECM. When the solenoid is off, the vacuum signal from the

intake manifold is cut. When the ECM sends an ON signal the coil

pulls the plunger downward and feeds the vacuum signal to the

power valve actuator.

BBIA0569E

BBIA0569E

2011 Pathfinder

VARIABLE INDUCTION AIR SYSTEM

EC-65

< SYSTEM DESCRIPTION >

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Vacuum Hose Drawing

INFOID:0000000006243762

Refer to

EC-40, "System Diagram"

for Vacuum Control System.

PBIB2529E

2011 Pathfinder

EC-66

< SYSTEM DESCRIPTION >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Diagnosis Description

INFOID:0000000006709456

This system is an on board diagnostic system that records exhaust emission-related diagnostic information

and detects a sensors/actuator-related malfunction. A malfunction is indicated by the malfunction indicator

lamp (MIL) and stored in ECU memory as a DTC. The diagnostic information can be obtained with the diag-

nostic tool (GST: Generic Scan Tool).

GST (Generic Scan Tool)

INFOID:0000000006709457

When GST is connected with a data link connector equipped on the vehicle side, it will communicate with the

control unit equipped in the vehicle and then enable various kinds of diagnostic tests. Refer to

EC-66, "Diag-

nosis Description"

.

NOTE:

Service $0A is not applied for regions where it is not mandated.

2011 Pathfinder

DIAGNOSIS SYSTEM (ECM)

EC-67

< SYSTEM DESCRIPTION >

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DIAGNOSIS SYSTEM (ECM)

DIAGNOSIS DESCRIPTION
DIAGNOSIS DESCRIPTION : 1st Trip Detection Logic and Two Trip Detection Logic

INFOID:0000000006709458

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 illuminate 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 illuminates. The MIL illuminates 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 per-

formed during vehicle operation. Specific on board diagnostic items will cause the ECM to illuminate or blink

the MIL, and store DTC and Freeze Frame data, even in the 1st trip, as shown below.

×

: Applicable —: Not applicable

DIAGNOSIS DESCRIPTION : DTC and Freeze Frame Data

INFOID:0000000006709459

DTC AND 1ST TRIP DTC

The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic

result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not recur, the 1st trip DTC

will not be displayed.

If a malfunction is detected during the 1st trip, the 1st trip DTC is saved in the ECM memory. The MIL will not

light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required

driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the

2nd trip, both the 1st trip DTC and DTC are saved in the ECM memory and the MIL lights up. In other words,

the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consec-

utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd

trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the

1st trip, the DTC and 1st trip DTC are stored in the ECM memory.

For malfunctions in which 1st trip DTCs are displayed, refer to

EC-441, "DTC Index"

. These items are required

by legal regulations to continuously monitor the system/component. In addition, the items monitored non-con-

tinuously are also displayed on CONSULT-III.

1st trip DTC is specified in Service $07 of SAE J1979/ISO 15031-5. 1st trip DTC detection occurs without illu-

minating the MIL and therefore does not warn the driver of a malfunction.

When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame

data as specified in Work Flow procedure Step 2, refer to

EC-14, "Trouble Diagnosis Introduction"

. Then per-

form DTC Confirmation Procedure or Component Function Check to try to duplicate the malfunction. If the

malfunction is duplicated, the item requires repair.

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA

The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant tem-

perature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, absolute throttle position, base

fuel schedule and intake air temperature at the moment a malfunction is detected.

Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.

The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-III or

GST. The 1st trip freeze frame data can only be displayed on the CONSULT-III screen.

Items

MIL

DTC

1st trip DTC

1st trip

2nd trip

1st trip

displaying

2nd trip

displaying

1st trip

displaying

2nd trip

display-

ing

Blinking

Illuminat-

ed

Blinking

Illuminat-

ed

Misfire (Possible three way catalyst
damage) — DTC: P0300 – P0306
is being detected

×

—

—

—

—

—

×

—

Misfire (Possible three way catalyst
damage) — DTC: P0300 – P0306
is being detected

—

—

×

—

—

×

—

—

One trip detection diagnoses (Re-
fer to

EC-441, "DTC Index"

.)

—

×

—

—

×

—

—

—

Except above

—

—

—

×

—

×

×

—

2011 Pathfinder

EC-68

< SYSTEM DESCRIPTION >

[VQ40DE]

DIAGNOSIS SYSTEM (ECM)

Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the

ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority

for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once

freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no

longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-

lowing priorities to update the data.

For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was saved in the 2nd

trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated

from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-

function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is

stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st

trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze

frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the

ECM memory.

Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM mem-

ory is erased.

DIAGNOSIS DESCRIPTION : Counter System

INFOID:0000000006709460

RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

• When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are

stored in the ECM memory.

• When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are

stored in the ECM memory, and the MIL will come on.

• The MIL will turn OFF after the vehicle is driven 3 times (driving pattern B) with no malfunction. The drive is

counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs

while counting, the counter will reset.

• The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A) with-

out the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injec-

tion System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driving pattern

C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC RESULTS” mode of CON-

SULT-III will count the number of times the vehicle is driven.

• The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.

COUNTER SYSTEM CHART

For details about patterns B and C under “Fuel Injection System” and “Misfire”, see “EXPLANATION FOR

DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYS-

TEM”.

For details about patterns A and B under Other, see “EXPLANATION FOR DRIVING PATTERNS FOR “MIS-

FIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”.

• *1: Clear timing is at the moment OK is detected.

• *2: Clear timing is when the same malfunction is detected in the 2nd trip.

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns for “Misfire <Exhaust Quality De-
terioration>”, “Fuel Injection System”

Priority

Items

1

Freeze frame data

Misfire — DTC: P0300 – P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175

2

Except the above items

3

1st trip freeze frame data

Items

Fuel Injection System

Misfire

Other

MIL (turns OFF)

3 (pattern B)

3 (pattern B)

3 (pattern B)

DTC, Freeze Frame Data (no display)

80 (pattern C)

80 (pattern C)

40 (pattern A)

1st Trip DTC (clear)

1 (pattern C), *1

1 (pattern C), *1

1 (pattern B)

1st Trip Freeze Frame Data (clear)

*1, *2

*1, *2

1 (pattern B)

2011 Pathfinder

DIAGNOSIS SYSTEM (ECM)

EC-69

< SYSTEM DESCRIPTION >

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Explanation for Driving Patterns for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection System”

Driving Pattern B

Refer to

EC-71, "DIAGNOSIS DESCRIPTION : Driving Pattern"

.

*1: When the same malfunction is de-

tected in two consecutive trips, MIL
will light up.

*2: MIL will turn OFF after vehicle is driv-

en 3 times (pattern B) without any
malfunctions.

*3: When the same malfunction is de-

tected in two consecutive trips, the
DTC and the freeze frame data will be
stored in ECM.

*4: The DTC and the freeze frame data

will not be displayed any longer after
vehicle is driven 80 times (pattern C)
without the same malfunction. (The
DTC and the freeze frame data still
remain in ECM.)

*5: When a malfunction is detected for

the first time, the 1st trip DTC and the
1st trip freeze frame data will be
stored in ECM.

*6: The 1st trip DTC and the 1st trip

freeze frame data will be cleared at
the moment OK is detected.

*7: When the same malfunction is de-

tected in the 2nd trip, the 1st trip
freeze frame data will be cleared.

*8: 1st trip DTC will be cleared when ve-

hicle is driven once (pattern C) with-
out the same malfunction after DTC
is stored in ECM.

JMBIA1417GB

2011 Pathfinder