Nissan Frontier. Manual - part 610

DIAGNOSIS SYSTEM (ECM)

EC-1011

< SYSTEM DESCRIPTION >

[VQ40DE FOR MEXICO]

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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 com-

pensated by ECM according to the input signals.

• When the engine is stopped, a certain 

computed value is indicated.

INJ PULSE-B2

msec

IGN TIMING

BTDC

• 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 

current air flow divided by peak air flow.

MASS AIRFLOW

g/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)

°CA

• Indicates [

°CA] of intake camshaft advanced angle. 

INT/V TIM(B2)

°CA

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)

%

VIAS S/V-1

ON/OFF

• The control condition of the VIAS control solenoid 

valve (determined by ECM according to the input 
signals) is indicated.
ON: VIAS control solenoid valve is operating.
OFF: VIAS control solenoid valve is not operating.

AIR COND RLY

ON/OFF

• The air conditioner relay control condition (deter-

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

FUEL PUMP RLY

ON/OFF

• Indicates the fuel pump relay control condition de-

termined by ECM according to the input signals.

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.

COOLING FAN

HI/LOW/

OFF

• The control condition of the cooling fan (deter-

mined by ECM according to the input signals) is in-
dicated.
HI: High speed operation
LOW: Low speed operation
OFF: Stop

Monitored item

Unit

Description

Remarks

EC-1012

< SYSTEM DESCRIPTION >

[VQ40DE FOR MEXICO]

DIAGNOSIS SYSTEM (ECM)

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)

ON/OFF

I/P PULLY SPD

rpm

• Indicates the engine speed computed from thein-

put speed sensor signal.

VEHICLE SPEED

km/h or 

mph

• Indicates the vehicle speed computed from the out-

put speed sensor signal.

IDL A/V LEARN

YET/

CMPLT

• Displays 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.

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 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 brake pedal po-

sition switch signal.

BRAKE SW2

ON/OFF

• Indicates [ON/OFF] condition of stop lamp 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 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.

Monitored item

Unit

Description

Remarks

DIAGNOSIS SYSTEM (ECM)

EC-1013

< SYSTEM DESCRIPTION >

[VQ40DE FOR MEXICO]

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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

—

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-

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

HO2 S2 DIAG1(B2)

INCMP/

CMPLT

• Indicates DTC P0159 self-diagnosis (delayed re-

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

HO2 S2 DIAG2(B1)

INCMP/

CMPLT

• Indicates DTC P0139 self-diagnosis (slow re-

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

HO2 S2 DIAG2(B2)

INCMP/

CMPLT

• Indicates DTC P0159 self-diagnosis (slow re-

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

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.

Monitored item

Unit

Description

Remarks

EC-1014

< SYSTEM DESCRIPTION >

[VQ40DE FOR MEXICO]

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.

WORK SUPPORT MODE

Work Item

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

ACTIVE TEST MODE

Test Item

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.

Monitored item

Unit

Description

Remarks

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.