Nissan Pathfinder (2009 year). Manual - part 317

EC-550

< FUNCTION DIAGNOSIS >

[VK56DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

*: The item is the same as that of 1st trip freeze frame data.

DATA MONITOR MODE

Monitored Item

×

: Applicable

INT MANI PRES [kPa] 

• These items are displayed but are not applicable to this models.

COMBUST CONDITION

Freeze frame data item*

Description

Monitored item

Unit

Description

Remarks

ENG SPEED

rpm

• Indicates the engine speed computed from the 

signal of the crankshaft position sensor (POS) 
and camshaft position sensor (PHASE).

• Accuracy becomes poor if engine speed 

drops below the idle rpm.

• If the signal is interrupted while the engine 

is running, an abnormal value may be indi-
cated.

MAS A/F SE-B1

V

• The signal voltage of the mass air flow sensor is 

displayed.

• When the engine is stopped, a certain value 

is indicated.

• When engine is running, specification range 

is indicated in “SPEC”.

B/FUEL SCHDL

ms

• Base fuel schedule indicates the fuel injection 

pulse width programmed into ECM, prior to any 
learned on board correction.

• When engine is running, specification range 

is indicated in “SPEC”.

A/F ALPHA-B1

%

• The mean value of the air-fuel ratio feedback cor-

rection factor per cycle is indicated.

• When the engine is stopped, a certain value 

is indicated.

• When engine is running, specification range 

is indicated in “SPEC”.

• This data also includes the data for the air-

fuel ratio learning control.

A/F ALPHA-B2

%

COOLAN TEMP/S

°

C or 

°

F

• The engine coolant temperature (determined by 

the signal voltage of the engine coolant tempera-
ture sensor) is displayed.

• When the engine coolant temperature sen-

sor is open or short-circuited, ECM enters 
fail-safe mode. The engine coolant temper-
ature determined by the ECM is displayed.

A/F SEN1 (B1)

V

• The A/F signal computed from the input signal of 

the A/F sensor 1 is displayed.

A/F SEN1 (B2)

V

HO2S2 (B1)

V

• The signal voltage of the heated oxygen sensor 2 

is displayed.

HO2S2 (B2)

V

HO2S2 MNTR (B1)

RICH/

LEAN

• Display of heated oxygen sensor 2 signal:

RICH: means the amount of oxygen after three 
way catalyst is relatively small.
LEAN: means the amount of oxygen after three 
way catalyst is relatively large.

• When the engine is stopped, a certain value 

is indicated.

HO2S2 MNTR (B2)

RICH/

LEAN

VHCL SPEED SE

km/h or 

mph

• The vehicle speed computed from the vehicle 

speed signal sent from unified meter control unit 
is displayed.

BATTERY VOLT

V

• The power supply voltage of ECM is displayed.

ACCEL SEN 1

V

• The accelerator pedal position sensor signal volt-

age is displayed.

• ACCEL SEN 2 signal is converted by ECM 

internally. Thus, it differs from ECM terminal 
voltage signal.

ACCEL SEN 2

V

TP SEN 1-B1

V

• The throttle position sensor signal voltage is dis-

played.

• TP SEN 2-B1 signal is converted by ECM 

internally. Thus, it differs from ECM terminal 
voltage signal.

TP SEN 2-B1

V

FUEL T/TMP SE

°

C or 

°

F

• The fuel temperature (determined by the signal 

voltage of the fuel tank temperature sensor) is 
displayed.

INT/A TEMP SE

°

C or 

°

F

• The intake air temperature (determined by the 

signal voltage of the intake air temperature sen-
sor) is indicated.

2009 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-551

< FUNCTION DIAGNOSIS >

[VK56DE]

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EVAP SYS PRES

V

• The signal voltage of EVAP control system pres-

sure sensor is displayed.

FUEL LEVEL SE

V

• The signal voltage of the fuel level sensor is dis-

played.

START SIGNAL

ON/OFF

• Indicates start signal status [ON/OFF] computed 

by ECM according to the signals of engine speed 
and battery voltage.

• After starting the engine, [OFF] is displayed 

regardless of the starter signal.

CLSD THL POS

ON/OFF

• Indicates idle position [ON/OFF] computed by 

ECM according to the accelerator pedal position 
sensor signal.

AIR COND SIG

ON/OFF

• Indicates [ON/OFF] condition of the air condition-

er switch as determined by the air conditioner sig-
nal.

P/N POSI SW

ON/OFF

• Indicates [ON/OFF] condition from the park/neu-

tral position (PNP) signal.

PW/ST SIGNAL

ON/OFF

• [ON/OFF] condition of the power steering system 

(determined by the signal voltage of the power 
steering pressure sensor signal) is indicated.

LOAD SIGNAL

ON/OFF

• Indicates [ON/OFF] condition from the electrical 

load signal.
ON: Lighting switch is in 2nd position.
OFF: Lighting switch is OFF.

IGNITION SW

ON/OFF

• Indicates [ON/OFF] condition from ignition switch 

signal.

HEATER FAN SW

ON/OFF

• Indicates [ON/OFF] condition from heater fan 

switch signal.

BRAKE SW

ON/OFF

• Indicates [ON/OFF] condition from the stop lamp 

switch signal.

INJ PULSE-B1

msec

• Indicates the actual fuel injection pulse width 

compensated by ECM according to the input sig-
nals.

• When the engine is stopped, a certain com-

puted value is indicated.

INJ PULSE-B2

msec

IGN TIMING

BTDC

• Indicates the ignition timing computed by ECM 

according to the input signals.

• When the engine is stopped, a certain value 

is indicated.

CAL/LD VALUE

%

• “Calculated load value” indicates the value of the 

current air flow divided by peak air flow.

MASS AIRFLOW

gm/s

• Indicates the mass air flow computed by ECM ac-

cording to the signal voltage of the mass air flow 
sensor.

PURG VOL C/V

%

• Indicates the EVAP canister purge volume control 

solenoid valve control value computed by ECM 
according to the input signals.

• The opening becomes larger as the value in-

creases.

INT/V TIM (B1)

°

CA

• Indicates [

°

CA] of intake camshaft advanced an-

gle. 

INT/V TIM (B2)

°

CA

INT/V SOL (B1)

%

• The control value of the intake valve timing con-

trol solenoid valve (determined by ECM accord-
ing to the input signals) is indicated.

• The advance angle becomes larger as the value 

increases.

INT/V SOL (B2)

%

AIR COND RLY

ON/OFF

• The air conditioner relay control condition (deter-

mined by ECM according to the input signals) is 
indicated.

FUEL PUMP RLY

ON/OFF

• Indicates the fuel pump relay control condition 

determined by ECM according to the input sig-
nals.

Monitored item

Unit

Description

Remarks

2009 Pathfinder

EC-552

< FUNCTION DIAGNOSIS >

[VK56DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

VENT CONT/V

ON/OFF

• The control condition of the EVAP canister vent 

control valve (determined by ECM according to 
the input signals) is indicated.
ON: Closed
OFF: Open

THRTL RELAY

ON/OFF

• Indicates the throttle control motor relay control 

condition determined by ECM according to the in-
put signals.

COOLING FAN

HI/LOW/

OFF

• The control condition of the cooling fan (deter-

mined by ECM according to the input signals) is 
indicated.
HI: High speed operation
LOW: Low speed operation
OFF: Stop

HO2S2 HTR (B1)

ON/OFF

• Indicates [ON/OFF] condition of heated oxygen 

sensor 2 heater determined by ECM according to 
the input signals.

HO2S2 HTR (B2)

ON/OFF

I/P PULLY SPD

rpm

• Indicates the engine speed computed from the 

turbine revolution sensor signal.

VEHICLE SPEED

km/h or 

mph

• Indicates the vehicle speed computed from the 

revolution sensor signal.

IDL A/V LEARN

YET/CM-

PLT

• Displays the condition of Idle Air Volume Learning

YET: Idle Air Volume Learning has not been per-
formed yet.
CMPLT: Idle Air Volume Learning has already 
been performed successfully.

TRVL AFTER MIL

km or 

mile

• Distance traveled while MIL is activated.

A/F S1 HTR (B1)

%

• A/F sensor 1 heater control value computed by 

ECM according to the input signals.

• The current flow to the heater becomes larger as 

the value increases.

A/F S1 HTR (B2)

%

AC PRESS SEN

V

• The signal voltage from the refrigerant pressure 

sensor is displayed.

VHCL SPEED SE

km/h or 

mph

• The vehicle speed computed from the vehicle 

speed signal sent from unified meter control unit 
is displayed.

SET VHCL SPD

km/h or 

mph

• The preset vehicle speed is displayed.

MAIN SW

ON/OFF

• Indicates [ON/OFF] condition from MAIN switch 

signal.

CANCEL SW

ON/OFF

• Indicates [ON/OFF] condition from CANCEL 

switch signal.

RESUME/ACC SW

ON/OFF

• Indicates [ON/OFF] condition from RESUME/AC-

CELERATE switch signal.

SET SW

ON/OFF

• Indicates [ON/OFF] condition from SET/COAST 

switch signal.

BRAKE SW1

ON/OFF

• Indicates [ON/OFF] condition from ASCD brake 

switch signal.

BRAKE SW2

ON/OFF

• Indicates [ON/OFF] condition of stop lamp switch 

signal.

VHCL SPD CUT

NON/

CUT

• Indicates the vehicle cruise condition.

NON: Vehicle speed is maintained at the ASCD 
set speed.
CUT: Vehicle speed increased to excessively 
high compared with the ASCD set speed, and 
ASCD operation is cut off.

Monitored item

Unit

Description

Remarks

2009 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-553

< FUNCTION DIAGNOSIS >

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NOTE:

Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

ACTIVE TEST MODE

Test Item

LO SPEED CUT

NON/

CUT

• Indicates the vehicle cruise condition.

NON: Vehicle speed is maintained at the ASCD 
set speed.
CUT: Vehicle speed decreased to excessively 
low compared with the ASCD set speed, and 
ASCD operation is cut off.

AT OD MONITOR

ON/OFF

• Indicates [ON/OFF] condition of A/T O/D accord-

ing to the input signal from TCM.

AT OD CANCEL

ON/OFF

• Indicates [ON/OFF] condition of A/T O/D cancel 

signal sent from TCM.

CRUISE LAMP

ON/OFF

• Indicates [ON/OFF] condition of CRUISE lamp 

determined by ECM according to the input sig-
nals.

SET LAMP

ON/OFF

• Indicates [ON/OFF] condition of SET lamp deter-

mined by ECM according to the input signals.

ALT DUTY

%

• Indicates the duty ratio of the power generation 

command value. The ratio is calculated by ECM 
based on the battery current sensor signal.

BAT CUR SEN

mV

• The signal voltage of battery current sensor is 

displayed.

ALT DUTY SIG

ON/OFF

• The control condition of the power generation 

voltage variable control (determined by ECM ac-
cording to the input signals) is indicated.
ON: Power generation voltage variable control is 
active.
OFF: Power generation voltage variable control is 
inactive.

A/F  ADJ-B1

—

• Indicates the correction factor stored in ECM. The 

factor is calculated from the difference between 
the target air/fuel ratio stored in ECM and the air-
fuel ratio calculated from A/F sensor 1 signal. 

A/F ADJ-B2

—

Monitored item

Unit

Description

Remarks

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

FUEL INJEC-
TION

• Engine: Return to the original 

trouble condition

• Change the amount of fuel injec-

tion using CONSULT-III.

If trouble symptom disappears, see 
CHECK ITEM.

• Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1

IGNITION TIM-
ING

• Engine: Return to the original 

trouble condition

• Timing light: Set
• Retard the ignition timing using 

CONSULT-III.

If trouble symptom disappears, see 
CHECK ITEM.

• Perform Idle Air Volume Learning.

POWER BAL-
ANCE

• Engine: After warming up, idle the 

engine.

• A/C switch: OFF
• Selector lever: P or N
• Cut off each injector signal one at 

a time using CONSULT-III.

Engine runs rough or dies.

• Harness and connectors
• Compression
• Fuel injector
• Power transistor
• Spark  plug
• Ignition coil

COOLING FAN*

• Ignition switch: ON
• Turn the cooling fan HI and OFF 

using CONSULT-III.

Cooling fan moves and stops.

• Harness and connectors
• Cooling fan motor
• IPDM  E/R

2009 Pathfinder

EC-554

< FUNCTION DIAGNOSIS >

[VK56DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

*: Leaving cooling fan OFF with CONSULT-III while engine is running may cause the engine to overheat.

DTC & SRT CONFIRMATION MODE

SRT STATUS Mode

For details, refer to “SYSTEM READINESS TEST (SRT) CODE” in 

EC-525, "Emission-related Diagnostic

Information"

.

SRT WORK SUPPORT Mode

This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.

DTC WORK SUPPORT Mode

ENG COOLANT 
TEMP

• Engine: Return to the original 

trouble condition

• Change the engine coolant tem-

perature using CONSULT-III.

If trouble symptom disappears, see 
CHECK ITEM.

• Harness and connectors
• Engine coolant temperature sen-

sor

• Fuel injector

FUEL PUMP RE-
LAY

• Ignition  switch:  ON

(Engine stopped)

• Turn the fuel pump relay ON and 

OFF using CONSULT-III and lis-
ten to operating sound.

Fuel pump relay makes the operat-
ing sound.

• Harness and connectors
• Fuel  pump  relay

PURG VOL 
CONT/V

• Engine: After warming up, run en-

gine at 1,500 rpm.

• Change the EVAP canister purge 

volume control solenoid valve 
opening percent using CON-
SULT-III.

Engine speed changes according to 
the opening percent.

• Harness and connectors
• Solenoid valve

FUEL/T TEMP 
SEN

• Change the fuel tank temperature using CONSULT-III.

VENT CON-
TROL/V

• Ignition  switch:  ON

(Engine stopped)

• Turn solenoid valve ON and OFF 

with the CONSULT-III and listen 
to operating sound.

Solenoid valve makes an operating 
sound.

• Harness and connectors
• Solenoid valve

V/T ASSIGN AN-
GLE

• Engine: Return to the original 

trouble condition

• Change intake valve timing using 

CONSULT-III.

If trouble symptom disappears, see 
CHECK ITEM.

• Harness and connectors
• Intake valve timing control sole-

noid valve

ALTERNATOR 
DUTY

• Engine:  Idle
• Change duty ratio using CON-

SULT-III.

Battery voltage changes.

• Harness and connectors
• IPDM E/R
• Alternator

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

Test mode

Test item

Corresponding DTC No.

Reference page

EVAPORATIVE
SYSTEM

PURG FLOW P0441

P0441

EC-699, "DTC Confirmation Procedure"

EVP SML LEAK P0442/P1442*

P0442

EC-705, "DTC Confirmation Procedure"

P0455

EC-740, "DTC Confirmation Procedure"

EVP V/S LEAK P0456/P1456*

P0456

EC-748, "DTC Confirmation Procedure"

PURG VOL CN/V P1444

P0443

EC-712, "DTC Confirmation Procedure"

A/F SEN1

A/F SEN1 (B1) P1276

P0130

EC-621, "DTC Confirmation Procedure"

A/F SEN1 (B1) P1278/P1279

P0133

EC-633, "DTC Confirmation Procedure"

A/F SEN1 (B2) P1286

P0150

EC-621, "DTC Confirmation Procedure"

A/F SEN1 (B2) P1288/P1289

P0153

EC-633, "DTC Confirmation Procedure"

2009 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-555

< FUNCTION DIAGNOSIS >

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*: DTC P1442 and P1456 does not apply to R51 models but appears in DTC Work Support Mode screens.

Generic Scan Tool (GST) Function

INFOID:0000000003936478

DESCRIPTION

Generic Scan Tool (OBD II scan tool) complying with SAE J1978 has
several functions explained below.
ISO15765-4 is used as the protocol.
The name GST or Generic Scan Tool is used in this service manual.

FUNCTION

HO2S2

HO2S2 (B1) P0139

P0139

EC-652, "DTC Confirmation Procedure"

HO2S2 (B1) P1146

P0138

EC-644, "DTC Confirmation Procedure"

HO2S2 (B1) P1147

P0137

EC-639, "DTC Confirmation Procedure"

HO2S2 (B2) P0159

P0159

EC-652, "DTC Confirmation Procedure"

HO2S2 (B2) P1166

P0158

EC-644, "DTC Confirmation Procedure"

HO2S2 (B2) P1167

P0157

EC-639, "DTC Confirmation Procedure"

Test mode

Test item

Corresponding DTC No.

Reference page

SEF139P

Diagnostic test mode

Function

Service $01

READINESS TESTS

This diagnostic service gains access to current emission-related data values, including analog 
inputs and outputs, digital inputs and outputs, and system status information.

Service $02

(FREEZE DATA)

This diagnostic service gains access to emission-related data value which were stored by 
ECM during the freeze frame. For details, refer to 

EC-525, "Emission-related Diagnostic Infor-

mation"

.

Service $03

DTCs

This diagnostic service gains access to emission-related power train trouble codes which 
were stored by ECM.

Service $04

CLEAR DIAG INFO

This diagnostic service can clear all emission-related diagnostic information. This includes:
• Clear number of diagnostic trouble codes (Service $01)
• Clear diagnostic trouble codes (Service $03)
• Clear trouble code for freeze frame data (Service $01)
• Clear freeze frame data (Service $02)
• Reset status of system monitoring test (Service $01)
• Clear on board monitoring test results (Service $06 and $07)

Service $06

(ON BOARD TESTS)

This diagnostic service accesses the results of on board diagnostic monitoring tests of specific 
components/systems that are not continuously monitored.

Service $07

(ON BOARD TESTS)

This diagnostic service enables the off board test drive to obtain test results for emission-re-
lated powertrain components/systems that are continuously monitored during normal driving 
conditions.

2009 Pathfinder

EC-556

< FUNCTION DIAGNOSIS >

[VK56DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

INSPECTION PROCEDURE

1.

Turn ignition switch OFF.

2.

Connect GST to data link connector (1), which is located under
LH dash panel near the hood opener handle.
• Brake pedal (2)

3.

Turn ignition switch ON.

4.

Enter the program according to instructions on the screen or in
the operation manual.
(*: Regarding GST screens in this section, sample screens are
shown.)

5.

Perform each diagnostic service according to each service pro-
cedure.
For further information, see the GST Operation Manual of
the tool maker.

Service $08

—

This diagnostic service can close EVAP system in ignition switch ON position (Engine 
stopped). When this diagnostic service is performed, the EVAP canister vent control valve can 
be closed.
In the following conditions, this diagnostic service cannot function.
• Low ambient temperature
• Low battery voltage
• Engine running
• Ignition switch OFF
• Low fuel temperature
• Too much pressure is applied to EVAP system

Service $09

(CALIBRATION ID)

This diagnostic service enables the off-board test device to request specific vehicle informa-
tion such as Vehicle Identification Number (VIN) and Calibration IDs.

Diagnostic test mode

Function

ALBIA0359ZZ

SEF398S

SEF416S

2009 Pathfinder

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-557

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COMPONENT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

INFOID:0000000003936479

The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” of “DATA MONI-
TOR” mode of CONSULT-III during normal operation of the Engine Control System. When the value in “SPEC”
of “DATA MONITOR” mode is within the SP value, the Engine Control System is confirmed OK. When the
value in “SPEC” of “DATA MONITOR” mode is NOT within the SP value, the Engine Control System may have
one or more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not illuminate
the MIL.
The SP value will be displayed for the following three items:
• B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correc-

tion)

• A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
• MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)

Testing Condition

INFOID:0000000003936480

• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm

2

, 14.25 - 15.12 psi)

• Atmospheric temperature: 20 - 30

°

C (68 - 86

°

F)

• Engine coolant temperature: 75 - 95

°

C (167 - 203

°

F)

• Engine speed: Idle
• Transmission: Warmed-up
- After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP SE 1” (A/T

fluid temperature sensor signal) indicates more than 60

°

C (140

°

F).

• Electrical load: Not applied
- Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight

ahead.

Inspection Procedure

INFOID:0000000003936481

NOTE:
Perform “SPEC” in “DATA MONITOR” mode in maximum scale display.
1.

Perform 

EC-495, "Basic Inspection"

.

2.

Check that the testing conditions indicated above are met.

3.

Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2” and “MAS A/F SE-B1” in “SPEC” of “DATA
MONITOR” mode with CONSULT-III.

4.

Check that monitor items are within the SP value.

5.

If NG, go to 

EC-558, "Diagnosis Procedure"

.

2009 Pathfinder