Nissan Frontier D40. Manual - part 460

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-531

< FUNCTION DIAGNOSIS >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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

V

• The power supply voltage of ECM is displayed.

ACCEL SEN 1

V

• 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

V

TP SEN 1-B1

V

• 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

V

FUEL T/TMP SE

°

C or 

°

F

• The fuel temperature (determined by the signal 

voltage of the fuel tank temperature sensor) is dis-
played.

INT/A TEMP SE

°

C or 

°

F

• The intake air temperature (determined by the sig-

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

EVAP SYS PRES

V

FUEL LEVEL SE

V

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 signal.

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 conditioner 

switch as determined by the air conditioner signal.

P/N POSI SW

ON/OFF

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

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 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·m/s

• Indicates the mass air flow computed by ECM ac-

cording to the signal voltage of the mass air flow 
sensor.

Monitored item

Unit

Description

Remarks

EC-532

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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

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 the in-

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.

Monitored item

Unit

Description

Remarks

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-533

< FUNCTION DIAGNOSIS >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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.

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

—

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.

Monitored item

Unit

Description

Remarks

EC-534

< FUNCTION DIAGNOSIS >

[VQ40DE]

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

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.

Monitored item

Unit

Description

Remarks

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-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
• Shift lever: P or N (A/T), Neutral 

(M/T)

• Cut off each fuel 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

COOLING FAN*

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

OFF using CONSULT-III.

Cooling fan moves and stops.

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

ENG COOLANT 
TEMP

• Engine: Return to the original 

non-standard condition

• Change the engine coolant tem-

perature using CONSULT-III.

If mulfunctioning 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

VIAS SOL VALVE

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

with CONSULT-III and listen for 
operating 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-III.

Engine speed changes according to 
the opening percent.

• Harness and connectors
• Solenoid valve