Infiniti FX35, FX50 (S51). Manual - part 795

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-721

< SYSTEM DESCRIPTION >

[VK50VE]

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IGNITION SW

ON/OFF

• Indicates [ON/OFF] condition from ignition switch 

signal.

HEATER FAN SW

ON/OFF

• Indicates [ON/OFF] condition from the 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 

computed value is indicated.

INJ PULSE-B2

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

g·m/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 con-

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

• The opening becomes larger as the value in-

creases.

EXH/V TIM B1

°

CA

• Indicates [

°

CA] of exhaust camshaft retard angle.

EXH/V TIM B2

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.

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 the ECM according to 
the input signals.

A/F S1 HTR (B1)

%

• Air fuel ratio (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)

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)

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.

I/P PULLY SPD

rpm

• Indicates the engine speed computed from the in-

put speed sensor signal.

VEHICLE SPEED

km/h or mph

• The vehicle speed computed from the vehicle 

speed signal sent from TCM is displayed.

Monitored item

Unit

Description

Remarks

EC-722

< SYSTEM DESCRIPTION >

[VK50VE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

IDL A/V LEARN

YET/CMPLT

• Displays the condition of Idle Air Volume Learn-

ing
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.

SNOW MODE SW

ON/OFF

• Indicates [ON/OFF] condition from the snow 

mode switch signal.

ENG OIL TEMP

°

C or 

°

F

• The engine oil temperature (determined by the 

signal voltage of the engine oil temperature sen-
sor) is displayed.

VHCL SPEED SE

km/h or mph

• The vehicle speed computed from the vehicle 

speed signal sent from unified meter and A/C 
amp. 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.

DIST SW

ON/OFF

• Indicates [ON/OFF] condition from DISTANCE 

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 decreased to excessively 
low compared with the ASCD set speed, and 
ASCD operation is cut off.

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, 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 the TCM.

AT OD CANCEL

ON/OFF

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

request signal.

CRUISE LAMP

ON/OFF

• Indicates [ON/OFF] condition of CRUISE indica-

tor determined by the ECM according to the input 
signals.

SET LAMP

ON/OFF

• Indicates [ON/OFF] condition of SET indicator 

determined by the ECM according to the input 
signals.

Monitored item

Unit

Description

Remarks

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-723

< SYSTEM DESCRIPTION >

[VK50VE]

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EXH V/T LEARN

YET/CMPLT

• Display the condition of Exhaust Valve Timing 

Control Learning
YET: Exhaust Valve Timing Control Learning has 
not been performed yet.
CMPLT: Exhaust Valve Timing Control Learning 
has already been performed successfully.

FAN DUTY

%

• Indicates a command value for cooling fan. The 

value is calculated by ECM based on input sig-
nals.

AC EVA TEMP

°

C or 

°

F

• Indicates A/C evaporator temperature sent from 

“unified meter and A/C amp.”.

AC EVA TARGET

°

C or 

°

F

• Indicates target A/C evaporator temperature sent 

from “unified meter and A/C amp.”.

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.

A/F ADJ-B1

—

• Indicates the correction of a factor stored in ECM. 

The factor is calculated from the difference be-
tween the target air-fuel ratio stored in ECM and 
the air-fuel ratio calculated from A/F sensor 1 sig-
nal.

A/F ADJ-B2

TP SEN 1-B2

V

• The throttle position sensor signal voltage is dis-

played.

• TP SEN 2-B2 signal is converted by 

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

TP SEN 2-B2

P/N POSI SW

ON/OFF

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

tral position (PNP) signal.

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.

AC PRESS SEN

V

• The signal voltage from the refrigerant pressure 

sensor is displayed.

VTC DTY EX B1

%

• The control value of the exhaust valve timing con-

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

• The retard angle becomes larger as the value in-

creases.

VTC DTY EX B2

INT/V TIM (B1)

°

CA

• Indicates [

°

CA] of intake camshaft advance an-

gle. 

INT/V TIM (B2)

VVEL LEARN

YET/DONE

• Display the condition of VVEL learning

YET: VVEL learning has not been performed yet.
DONE: VVEL learning has already been per-
formed successfully.

VVEL SEN LEARN-
B1

V

• Indicates the VVEL learning value.

VVEL SEN LEARN-
B2

VVEL POSITION 
SEN-B1

V

• The VVEL control shaft position sensor signal 

voltage is displayed.

VVEL POSITION 
SEN-B2

Monitored item

Unit

Description

Remarks

EC-724

< SYSTEM DESCRIPTION >

[VK50VE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

NOTE:

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

ACTIVE TEST MODE

Test Item

VVEL TIM-B1

deg

• Indicates [deg] of VVEL control shaft angle. 

VVEL TIM-B2

FPCM

HI/MID/LOW/

OFF

• The control condition of the fuel pump control 

module (FPCM) (determined by ECM according 
to the input signals) is indicated.

Monitored item

Unit

Description

Remarks

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

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

ENG COOLANT 
TEMP

• Engine: Return to the original 

non-standard condition

• Change the engine coolant tem-

perature using CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Harness and connectors
• Engine coolant temperature sen-

sor

• Fuel injector

FUEL INJEC-
TION

• Engine: Return to the original 

non-standard condition

• Change the amount of fuel injec-

tion using CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

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

FUEL/T TEMP 
SEN

• Change the fuel tank temperature using CONSULT-III.

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

FAN DUTY CON-
TROL*

• Ignition  switch:  ON
• Change duty ratio using CON-

SULT-III.

Cooling fan speed changes.

• Harness and connectors
• Cooling fan motor
• Cooling fan relay
• Cooling fan control module
• IPDM E/R

ALTERNATOR 
DUTY

• Engine:  Idle
• Change duty ratio using CON-

SULT-III.

Battery voltage changes.

• Harness and connectors
• IPDM E/R
• Alternator

EXH V/T ASSIGN 
ANGLE

• Engine: Return to the original 

non-standard condition

• Change exhaust valve timing us-

ing CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Harness and connectors
• Exhaust valve timing control mag-

net retarder

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 stops.

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