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Infiniti FX35, FX50 (S51). Manual - part 646

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-125

< SYSTEM DESCRIPTION >

[VQ35HR]

• 1st trip freeze frame data

• System readiness test (SRT) codes

• Test values

WORK SUPPORT MODE

Work Item

*: This function is not necessary in the usual service procedure.

SELF-DIAG RESULTS MODE

Self Diagnostic Item

Regarding items of DTC and 1st trip DTC, refer to

EC-541, "DTC Index"

Freeze Frame Data and 1st Trip Freeze Frame Data

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

• Fuel pump will stop by touching “START” during idling.

Crank a few times after engine stalls.

When releasing fuel pressure from
fuel line

IDLE AIR VOL LEARN

• The idle air volume that keeps the engine within the spec-

ified range is memorized in ECM.

When learning the idle air volume

SELF-LEARNING CONT

• The coefficient of self-learning control mixture ration re-

turns to the original coefficient.

When clearing mixture ratio self-
learning value

EVAP SYSTEM CLOSE

Close the EVAP canister vent control valve in order to make
EVAP system close under the following conditions.
• Ignition switch ON
• Engine not running
• Ambient temperature is above 0

C (32

F).

• No vacuum and no high pressure in EVAP system
• Fuel tank temperature. Is more than 0

C (32

F).

• Within 10 minutes after starting “EVAP SYSTEM CLOSE”
• When trying to execute “EVAP SYSTEM CLOSE” under

the condition except above, CONSULT-III will discontinue
it and display appropriate instruction.
NOTE:
When starting engine, CONSULT-III may display “BAT-
TERY VOLTAGE IS LOW. CHARGE BATTERY”, even
when using a charged battery.

When detecting EVAP vapor leak
in the EVAP system

VIN REGISTRATION

• In this mode, VIN is registered in ECM.

When registering VIN in ECM

EXH V/T CONTROL LEARN

• In this mode, operation to learn exhaust valve timing con-

trol magnet retarder characteristic.

When learning the exhaust valve
timing control

TARGET IDLE RPM ADJ*

• Idle condition

When setting target idle speed

TARGET IGN TIM ADJ*

• Idle condition

When adjusting target ignition tim-
ing

Freeze frame data

item*

Description

DTC

• The engine control component part/control system has a trouble code that is displayed as DTC. (Refer to

EC-541, "DTC Index"

FUEL SYS-B1

• “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One of the following mode is displayed.

Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop

FUEL SYS-B2

CAL/LD VALUE [%]

• The calculated load value at the moment a malfunction is detected is displayed.

COOLANT TEMP [

or [

• The engine coolant temperature at the moment a malfunction is detected is displayed.

EC-126

< SYSTEM DESCRIPTION >

[VQ35HR]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE

Monitored Item

L-FUEL TRM-B1 [%]

• “Long-term fuel trim” at the moment a malfunction is detected is displayed.
• The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than

short-term fuel trim.

L-FUEL TRM-B2 [%]

S-FUEL TRM-B1 [%]

• “Short-term fuel trim” at the moment a malfunction is detected is displayed.
• The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel sched-

ule.

S-FUEL TRM-B2 [%]

ENGINE SPEED [rpm]

• The engine speed at the moment a malfunction is detected is displayed.

VEHICL SPEED
[km/h] or [mph]

• The vehicle speed at the moment a malfunction is detected is displayed.

ABSOL TH·P/S [%]

• The throttle valve opening angle at the moment a malfunction is detected is displayed.

B/FUEL SCHDL
[msec]

• The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE [

or [

• The intake air temperature at the moment a malfunction is detected is displayed.

INT MANI PRES [kPa]

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

COMBUST CONDI-
TION

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 and cam-
shaft position sensor.

• 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 indicated.

MAS A/F SE-B1

• 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”.

MAS A/F SE-B2

B/FUEL SCHDL

msec

• “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.

• This data also includes the data for

the air-fuel ratio learning control.

• When engine is running, specification

range is indicated in “SPEC”.

A/F ALPHA-B2

COOLAN TEMP/S

C or

• The engine coolant temperature (determined by

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

• When the engine coolant temperature

sensor is open or short-circuited,
ECM enters fail-safe mode. The en-
gine coolant temperature determined
by the ECM is displayed.

A/F SEN1 (B1)

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

the air fuel ratio (A/F) sensor 1 is displayed.

A/F SEN1 (B2)

HO2S2 (B1)

• The signal voltage of the heated oxygen sensor 2

is displayed.

HO2S2 (B2)

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-127

< SYSTEM DESCRIPTION >

[VQ35HR]

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)

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.

BATTERY VOLT

• The power supply voltage of ECM is displayed.

ACCEL SEN 1

• The accelerator pedal position sensor signal volt-

age is displayed.

• ACCEL SEN 2 signal is converted by

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

ACCEL SEN 2

TP SEN 1-B1

• The throttle position sensor signal voltage is dis-

played.

• TP SEN 2-B1 signal is converted by

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

TP SEN 2-B1

FUEL T/TMP SE

C or

• The fuel temperature (determined by the signal

voltage of the fuel tank temperature sensor) is
displayed.

INT/A TEMP SE

C or

• The intake air temperature (determined by the

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

EVAP SYS PRES

• The signal voltage of EVAP control system pres-

sure sensor is displayed.

FUEL LEVEL SE

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

played.

START SIGNAL

ON/OFF

• Indicates start signal status [ON/OFF] computed

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

• After starting the engine, [OFF] is dis-

played regardless of the starter sig-
nal.

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: Rear window defogger switch is ON and/or
lighting switch is in 2nd position.
OFF: Both rear window defogger switch and light-
ing switch are OFF.

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.

Monitored item

Unit

Description

Remarks

EC-128

< SYSTEM DESCRIPTION >

[VQ35HR]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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.

INT/V TIM (B1)

• Indicates [

CA] of intake camshaft advance an-

gle.

INT/V TIM (B2)

EXH/V TIM B1

• 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)

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

TP SEN 1-B2

• 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

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.

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.

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)

I/P PULLY SPD

rpm

• Indicates the engine speed computed from the

Input speed sensor signal.

VEHICLE SPEED

km/h or mph

• The vehicle speed computed from the vehicle

speed signal sent from TCM is displayed.

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.

SNOW MODE SW

ON/OFF

• Indicates [ON/OFF] condition from the snow

mode switch signal.

Monitored item

Unit

Description

Remarks

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