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Infiniti FX35 / FX45. Manual - part 340

TROUBLE DIAGNOSIS

EC-121

< SERVICE INFORMATION >

[VQ35DE]

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

DATA MONITOR MODE

Monitored Item

: Applicable

INT/A TEMP SE
[

C] or [

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

INT MANI PRES [kPa]

• Always a certain value is displayed.
• These items are not efficient for S50 models.

FTFMCH1

Freeze frame data

item*

Description

Monitored item

Unit

Description

Remarks

ENG SPEED

rpm

• Indicates the engine speed computed from the sig-

nal 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 en-

gine 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.

B/FUEL SCHDL

• Base fuel schedule indicates the fuel injection

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

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.

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 engine cool-
ant 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)

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 combination meter is dis-
played.

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, it differs from ECM
terminal voltage signal.

ACCEL SEN 2

TP SEN 1-B1

• The throttle position sensor signal voltage is dis-

played.

• THRTL SEN 2 signal is converted by

ECM internally. Thus, it 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 dis-
played.

INT/A TEMP SE

C or

• The intake air temperature (determined by the sig-

nal voltage of the intake air temperature sensor) is
indicated.

EC-122

< SERVICE INFORMATION >

[VQ35DE]

TROUBLE DIAGNOSIS

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

• 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 signal.

CLSD THL POS

• Indicates idle position [ON/OFF] computed by ECM

according to the accelerator pedal position sensor
signal.

AIR COND SIG

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

switch as determined by the air conditioner signal.

P/N POSI SW

• Indicates [ON/OFF] condition from the park/neutral

position (PNP) switch signal.

PW/ST SIGNAL

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

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

LOAD SIGNAL

• 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

• Indicates [ON/OFF] condition from ignition switch

signal.

HEATER FAN SW

• Indicates [ON/OFF] condition from the heater fan

switch signal.

BRAKE SW

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

switch signal.

INJ PULSE-B1

• Indicates the actual fuel injection pulse width com-

pensated by ECM according to the input signals.

• When the engine is stopped, a certain

computed value is indicated.

INJ PULSE-B2

IGN TIMING

• Indicates the ignition timing computed by ECM ac-

cording 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 cur-

rent 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 control

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

• The opening becomes larger as the value increas-

es.

INT/V TIM(B1)

• Indicates [

CA] of intake camshaft advanced angle.

INT/V TIM(B2)

INT/V SOL(B1)

• The control condition of the intake valve timing con-

trol solenoid valve (determined by ECM according
to the input signals) is indicated.

• The advance angle becomes larger as the value in-

creases.

INT/V SOL(B2)

AIR COND RLY

• The air conditioner relay control condition (deter-

mined by ECM according to the input signals) is in-
dicated.

FUEL PUMP RLY

• Indicates the fuel pump relay control condition de-

termined by ECM according to the input signals.

Monitored item

Unit

Description

Remarks

TROUBLE DIAGNOSIS

EC-123

< SERVICE INFORMATION >

[VQ35DE]

VENT CONT/V

• 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

• Indicates the throttle control motor relay control

condition determined by the ECM according to the
input signals.

COOLING FAN

HI/MID/

LOW/

OFF

• The control condition of the cooling fan (determined

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

HO2S2 HTR (B1)

• 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 tur-

bine revolution sensor signal.

VEHICLE SPEED

km/h or

mph

• Indicates the vehicle speed computed from the rev-

olution sensor signal.

IDL A/V LEARN

YET/

CMPLT

• Display 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.

SNOW MODE SW

ON/OFF

• Indicates [ON/OFF] condition from the snow mode

switch signal.

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)

AC PRESS SEN

• 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 TCM 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.

Monitored item

Unit

Description

Remarks

EC-124

< SERVICE INFORMATION >

[VQ35DE]

TROUBLE DIAGNOSIS

NOTE:

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

ACTIVE TEST MODE

Test Item

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 op-
eration 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
compared with the ASCD set speed, and ASCD op-
eration is cut off.

AT OD MONITOR

ON/OFF

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

to the input signal from the TCM.

AT OD CANCEL

ON/OFF

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

signal sent from the TCM.

DIST SW

ON/OFF

• Indicates [ON/OFF] condition from DISTANCE

switch signal.

CRUISE LAMP

ON/OFF

• Indicates [ON/OFF] condition of CRUISE lamp de-

termined by the ECM according to the input signals.

SET LAMP

ON/OFF

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

mined by the ECM according to the input signals.

A/F ADJ-B1

—

• Indicates the correction of 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 signal.

A/F ADJ-B2

ﾑ

Monitored item

Unit

Description

Remarks

TEST ITEM

CONDITION

JUDGEMENT

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 fuel 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”, “MID”,

“LOW” and “OFF” using CON-
SULT-III.

Cooling fan moves and stops.

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

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

Content .. 338 339 340 341 ..