Nissan Frontier. Instruction — part 488

DIAGNOSIS SYSTEM (ECM)

EC-523

< SYSTEM DESCRIPTION >

[VQ40DE FOR USA AND CANADA]

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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.

CRUISE LAMP

ON/OFF

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

termined by the ECM according to the input sig-
nals.

SET LAMP

ON/OFF

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

mined by the 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 dis-

played.

ALT DUTY SIG

ON/OFF

• The control condition of the power generation volt-

age variable control (determined by ECM accord-
ing 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 saved in ECM. The

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

A/F ADJ-B2

—

TUMBLE POS SEN

V

• The intake manifold runner control valve position

sensor signal voltage is displayed.

EVAP LEAK DIAG

YET/

CMPLT

• Indicates the condition of EVAP leak diagnosis.

YET: EVAP leak diagnosis has not been performed
yet.
CMPLT: EVAP leak diagnosis has been performed
successfully.

EVAP DIAG READY

ON/OFF

• Indicates the ready condition of EVAP leak diagno-

sis.
ON: Diagnosis has been ready condition.
OFF: Diagnosis has not been ready condition.

HO2 S2 DIAG1(B1)

INCMP/

CMPLT

• Indicates DTC P0139 self-diagnosis (delayed re-

sponse) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

HO2 S2 DIAG1(B2)

INCMP/

CMPLT

• Indicates DTC P0159 self-diagnosis (delayed re-

sponse) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

Monitored item

Unit

Description

Remarks

EC-524

< SYSTEM DESCRIPTION >

[VQ40DE FOR USA AND CANADA]

DIAGNOSIS SYSTEM (ECM)

*: The item is indicated, but not used.

NOTE:

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

HO2 S2 DIAG2(B1)

INCMP/

CMPLT

• Indicates DTC P0139 self-diagnosis (slow re-

sponse) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

HO2 S2 DIAG2(B2)

INCMP/

CMPLT

• Indicates DTC P0159 self-diagnosis (slow re-

sponse) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

VTC DTY EX B2

*

—

—

THRTL STK CNT B1

*

—

—

A/F-S ATMSPHRC
CRCT B1

—

• Displays a determined value of atmospheric cor-

rection factor necessary for correcting an A/F sen-
sor signal input to ECM.
The signal used for the correction is an A/F sensor
signal transmitted while driving under atmospheric
pressure.

A/F-S ATMSPHRC
CRCT B2

—

• Displays a determined value of atmospheric cor-

rection factor necessary for correcting an A/F sen-
sor signal input to ECM.
The signal used for the correction is an A/F sensor
signal transmitted while driving under atmospheric
pressure.

A/F-S ATMSPHRC
CRCT UP B1

count

• Displays the number of updates of the A/F sensor

atmospheric correction factor.

A/F-S ATMSPHRC
CRCT UP B2

count

• Displays the number of updates of the A/F sensor

atmospheric correction factor.

A/F SEN1 DIAG1(B1)

INCMP/
CMPLT

• Indicates DTC P015A or P015B self-diagnosis con-

dition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

A/F SEN1 DIAG1(B2)

INCMP/
CMPLT

• Indicates DTC P015C or P015D self-diagnosis

condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

A/F SEN1 DIAG2(B1)

INCMP/
CMPLT

• Indicates DTC P014C or P014D self-diagnosis

condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

A/F SEN1 DIAG2(B2)

INCMP/
CMPLT

• Indicates DTC P014E or P014F self-diagnosis con-

dition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

A/F SEN1 DIAG3(B1)

ABSNT/
PRSNT

• Indicates DTC P014C, P014D, P015A or P015B

self-diagnosis condition.
ABSNT: The vehicle condition is not within the diag-
nosis range.
PRSNT: The vehicle condition is within the diagno-
sis range.

A/F SEN1 DIAG3(B2)

ABSNT/
PRSNT

• Indicates DTC P014C, P014D, P015A or P015B

self-diagnosis condition.
ABSNT: The vehicle condition is not within the diag-
nosis range.
PRSNT: The vehicle condition is within the diagno-
sis range.

Monitored item

Unit

Description

Remarks

DIAGNOSIS SYSTEM (ECM)

EC-525

< SYSTEM DESCRIPTION >

[VQ40DE FOR USA AND CANADA]

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WORK SUPPORT MODE

Work Item

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

ACTIVE TEST MODE

Test Item

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 ratio returns

to the original coefficient.

When clearing the coefficient of
self-learning control value

EVAP SYSTEM CLOSE

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

°C (32°F).

• No vacuum and no high pressure in EVAP system
• Fuel tank temp 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 will discontinue it
and display appropriate instruction.
NOTE:
When starting engine, CONSULT 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 the mode, VIN is registered in ECM.

When registering VIN in ECM

TARGET IDLE RPM ADJ*

• Idle condition

When setting target idle speed

TARGET IGN TIM ADJ*

• Idle condition

When adjusting target ignition tim-
ing

CLSD THL POS LEARN

• Ignition on and engine stopped.

When learning the throttle valve
closed position

SAVING DATA FOR REPLC CPU

In this mode, save data that is in ECM.

When ECM is replaced.

WRITING DATA FOR REPLC CPU

In this mode, write data stored by “SAVE DATA FOR CPU
REPLC” in work support mode to ECM.

When ECM is replaced.

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

FUEL INJEC-
TION

• Engine: Return to the original

non-standard condition

• Change the amount of fuel injec-

tion using CONSULT.

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.

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
• Shift lever: P or N
• Cut off each fuel injector signal

one at a time using CONSULT.

Engine runs rough or stops.

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

COOLING FAN*

• Ignition switch: ON
• Turn the cooling fan HI, LOW and

OFF using CONSULT.

Cooling fan moves and stops.

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

EC-526

< SYSTEM DESCRIPTION >

[VQ40DE FOR USA AND CANADA]

DIAGNOSIS SYSTEM (ECM)

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

DTC WORK SUPPORT

Test Item

ENG COOLANT
TEMP

• Engine: Return to the original

non-standard condition

• Change the engine coolant tem-

perature using CONSULT.

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 and listen
to operating sound.

Fuel pump relay makes the operat-
ing sound.

• Harness and connectors
• Fuel pump relay

VIAS S/V-1

• Ignition switch: ON
• Turn solenoid valve ON and OFF

with CONSULT and listen for op-
erating sound.

Solenoid valve makes an operating
sound.

• Harness and connectors
• Solenoid valve

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.

Engine speed changes according to
the opening percent.

• Harness and connectors
• Solenoid valve

FUEL/T TEMP
SEN

• Change the fuel tank temperature using CONSULT.

VENT CON-
TROL/V

• Ignition switch: ON (Engine

stopped)

• Turn solenoid valve ON and OFF

with the CONSULT 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

non-standard condition

• Change intake valve timing using

CONSULT.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Harness and connectors
• Intake valve timing control sole-

noid valve

ALTERNATOR
DUTY

• Engine: Idle
• Change duty ratio using CON-

SULT.

Battery voltage changes.

• Harness and connectors
• IPDM E/R
• Alternator

TUMBLE CON-
TROL VALVE

• Ignition switch: ON
• Turn intake manifold runner con-

trol valve “ON” and “OFF” using
CONSULT and listen to operating
sound.

Intake Manifold Runner control
valve motor makes an operating
sound.

• Harness and connectors
• Intake Manifold Runner control

valve motor

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

Test mode

Test item

Corresponding DTC No.

Reference page

EVAPORATIVE SYS-
TEM

EVP V/S LEAK P0456/P1456*

P0442

EC-756

P0455

EC-793

P0456

EC-800

PURG VOL CN/V P1444

P0443

EC-763

PURG FLOW P0441

P0441

EC-751

A/F SEN1

A/F SEN1(B1) P1278/P1279

P014C, P014D, P014E,

P014F

EC-694

A/F SEN1(B1) P1276

P0130

EC-665

A/F SEN1(B2) P1288/P1289

P015A, P015B, P015C,

P015D

EC-694

A/F SEN1(B2) P1286

P0150

EC-665