Infiniti FX35, FX50 (S51). Manual — part 647

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-129

< SYSTEM DESCRIPTION >

[VQ35HR]

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ENG OIL TEMP

°

C or

°

F

• The engine oil temperature (determined by the

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

TRVL AFTER MIL

km or mile

• Distance traveled while MIL is activated.

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

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 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.

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.

Monitored item

Unit

Description

Remarks

EC-130

< SYSTEM DESCRIPTION >

[VQ35HR]

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

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 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 sig-
nal.

A/F ADJ-B2

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.

Monitored item

Unit

Description

Remarks

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

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

IGNITION TIM-
ING

• Engine: Return to the original

non-standard condition

• Timing light: Set
• Retard the ignition timing using

CONSULT-III.

If malfunctioning symptom disap-
pears, 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 stops.

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

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 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

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-131

< SYSTEM DESCRIPTION >

[VQ35HR]

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*: 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

EC-111, "Diagnosis Description"

.

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

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

INT V/T ASSIGN
ANGLE

• Engine: Return to the original

non-standard condition

• Change intake valve timing using

CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Harness and connectors
• Intake valve timing control sole-

noid valve

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

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

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

Test mode

Test item

Corresponding DTC No.

Reference page

EVAPORATIVE SYSTEM

EVP SML LEAK P0442/P1442*

P0442

EC-289

P0455

EC-326

EVP V/S LEAK P0456/P1456*

P0456

EC-332

PURG VOL CN/V P1444

P0443

EC-295

PURG FLOW P0441

P0441

EC-284

A/F SEN1

A/F SEN1 (B1) P1278/P1279

P0133

EC-210

A/F SEN1 (B1) P1276

P0130

EC-200

A/F SEN1 (B2) P1288/P1289

P0153

EC-210

A/F SEN1 (B2) P1286

P0150

EC-200

EC-132

< SYSTEM DESCRIPTION >

[VQ35HR]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

*: DTC P1442 and P1456 does not apply to S51 models but appears in DTC Work Support Mode screens.

Diagnosis Tool Function

INFOID:0000000005236733

DESCRIPTION

Generic Scan Tool (OBD II scan tool) complying with SAE J1978/
ISO 15031-4 has 8 different functions explained below.
ISO15765-4 is used as the protocol.
The name “GST” or “Generic Scan Tool” is used in this service man-
ual.

FUNCTION

HO2S2

HO2S2 (B1) P1146

P0138

EC-221

HO2S2 (B1) P1147

P0137

EC-215

HO2S2 (B1) P0139

P0139

EC-229

HO2S2 (B2) P1166

P0158

EC-221

HO2S2 (B2) P1167

P0157

EC-215

HO2S2 (B2) P0159

P0159

EC-229

Test mode

Test item

Corresponding DTC No.

Reference page

SEF139P

Diagnostic Service

Function

Service $01

READINESS TESTS

This diagnostic service gains access to current emission-related data values, including an-
alog 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 that were stored by
ECM during the freeze frame. For details, refer to

EC-541, "DTC Index"

.

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 in-
cludes:
• 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-
related powertrain components/systems that are continuously monitored during normal
driving conditions.