Nissan Note E12. Manual - part 179

DIAGNOSIS SYSTEM (ECM)

EC-55

< SYSTEM DESCRIPTION >

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COOLAN TEMP/S

°C or °F

×

×

The engine coolant tempera-
ture (determined by the signal 
voltage of the engine coolant 
temperature sensor) is dis-
played.

When the engine coolant tem-
perature sensor is open or 
short-circuited, ECM enters 
fail-safe mode. The engine 
coolant temperature deter-
mined by the ECM is dis-
played.

A/F SEN1 (B1)

V

×

×

The A/F signal computed from 
the input signal of the air fuel 
ratio (A/F) sensor 1 is dis-
played.

HO2S2 (B1)

V

×

×

The signal voltage of the heat-
ed oxygen sensor 2 is dis-
played.

HO2S2 MNTR(B1)

RICH/LEAN

×

Display of heated oxygen sen-
sor 2 signal:
RICH: means the amount of 
oxygen after three way cata-
lyst is relatively small.
LEAN: means the amount of 
oxygen after three way cata-
lyst is relatively large.

When the engine is stopped, a 
certain value is indicated.

VHCL SPEED SE

km/h or mph

×

×

The vehicle speed computed 
from the vehicle speed signal 
sent from combination meter 
is displayed.

BATTERY VOLT

V

The power supply voltage of 
ECM is displayed.

ACCEL SEN 1

V

The accelerator pedal position 
sensor signal voltage is dis-
played.

ACCEL SEN 2 signal is con-
verted by ECM internally. 
Thus, it differs from ECM ter-
minal voltage signal.

ACCEL SEN 2

TP SEN 1-B1

V

×

×

The throttle position sensor 
signal voltage is displayed.

TP SEN 2-B1 signal is con-
verted by ECM internally. 
Thus, it differs from ECM ter-
minal voltage signal.

TP SEN 2-B1

×

×

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 displayed regardless 
of the starter signal.

CLSD THL POS

ON/OFF

×

×

Indicates idle position [ON/
OFF] computed by ECM ac-
cording 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 condi-
tioner signal.

PW/ST SIGNAL

ON/OFF

×

×

[ON/OFF] condition of the 
power steering system (deter-
mined by the signal sent from 
EPS control unit) is indicated.

Monitored item

Unit

Monitor Item Selection

Description

Remarks

MAIN

SIGNALS

ECU INPUT

SIGNALS

EC-56

< SYSTEM DESCRIPTION >

[HR16DE]

DIAGNOSIS SYSTEM (ECM)

LOAD SIGNAL

ON/OFF

×

×

Indicates [ON/OFF] condition 
of the electrical lode signal.
ON: Rear window defogger 
switch is ON and/or lighting 
switch is 2nd position.
OFF: Both rear window defog-
ger switch and lighting 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 sig-
nal.

BRAKE SW

ON/OFF

Indicates [ON/OFF] condition 
from the stop lamp switch sig-
nal.

INJ PULSE-B1

msec

Indicates the actual fuel injec-
tion pulse width compensated 
by ECM according to the input 
signals.

When the engine is stopped, a 
certain computed value is indi-
cated.

IGN TIMING

BTDC

Indicates the ignition timing 
computed by ECM according 
to the input signals.

When the engine is stopped, a 
certain value is indicated.

CAL/LD VALUE

%

“Calculated load value” indi-
cates the value of the current 
air flow divided by peak air 
flow.

MASS AIRFLOW

g/s

Indicates the mass air flow 
computed by ECM according 
to the signal voltage of the 
mass air flow sensor.

PURG VOL C/V

%

• Indicates the EVAP canister 

purge volume control sole-
noid valve control value 
computed by the ECM ac-
cording to the input signals.

• The opening becomes larg-

er as the value increases.

INT/V TIM(B1)

°CA

Indicates [

°CA] of intake cam-

shaft advance angle.

EXH/V TIM B1

°CA

Indicates [

°CA] of exhaust 

camshaft retard angle.

INT/V SOL(B1)

%

• The control value of the in-

take valve timing control so-
lenoid valve (determined by 
ECM according to the input 
signals) is indicated.

• The advance angle be-

comes larger as the value 
increases.

AIR COND RLY

ON/OFF

The air conditioner relay con-
trol condition (determined by 
ECM according to the input 
signals) is indicated.

Monitored item

Unit

Monitor Item Selection

Description

Remarks

MAIN

SIGNALS

ECU INPUT

SIGNALS

DIAGNOSIS SYSTEM (ECM)

EC-57

< SYSTEM DESCRIPTION >

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FUEL PUMP RLY

ON/OFF

Indicates the fuel pump relay 
control condition determined 
by ECM according to the input 
signals.

THRTL RELAY

ON/OFF

Indicates the throttle control 
motor relay control condition 
determined by the ECM ac-
cording to the input signals.

COOLING FAN

HI/LOW/OFF

Indicates the condition of the 
cooling fan (determined by 
ECM according to the input 
signals).
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.

ALT DUTY SIG

ON/OFF

The control condition of the 
power generation voltage 
variable control (determined 
by ECM according to the input 
signals) is indicated.
ON: Power generation voltage 
variable control is active.
OFF: Power generation volt-
age variable control is inac-
tive.

VEHICLE SPEED

km/h or mph

The vehicle speed computed 
from the vehicle speed signal 
sent from TCM is displayed.

IDL A/V LEARN

YET/CMPLT

Displays the condition of Idle 
Air Volume Learning
YET: Idle air volume learning 
has not been performed yet.
CMPLT: Idle air volume learn-
ing has already been per-
formed successfully.

TRVL AFTER MIL

km or mile

Distance traveled while MIL is 
activated.

ENG OIL TEMP

°C or °F

The engine oil temperature 
(determined by the signal volt-
age of the engine oil tempera-
ture sensor) is indicated.

A/F S1 HTR(B1)

%

• Air fuel ratio (A/F) sensor 1 

heater control value com-
puted by ECM according to 
the input signals.

• The current flow to the heat-

er becomes larger as the 
value increases.

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

Monitor Item Selection

Description

Remarks

MAIN

SIGNALS

ECU INPUT

SIGNALS

EC-58

< SYSTEM DESCRIPTION >

[HR16DE]

DIAGNOSIS SYSTEM (ECM)

BAT CUR SEN

mV

The signal voltage of battery 
current sensor is displayed.

VHCL SPEED SE

km/h or mph

×

×

The vehicle speed computed 
from the vehicle speed signal 
sent from combination meter 
is displayed.

A/F ADJ-B1

—

Indicates the correction of a 
factor stored in ECM.
The factor is calculated from 
the difference between the 
target air-fuel ratio stored in 
ECM and the air-fuel ratio cal-
culated from A/F sensor 1 sig-
nal.

P/N POSI SW

ON/OFF

×

×

Indicates [ON/OFF] condition 
from the park/neutral position 
(PNP) signal.

INT/A TEMP SE

°C or °F

×

×

The intake air temperature 
(determined by the signal volt-
age of the intake air tempera-
ture sensor) is indicated.

AC PRESS SEN

V

The signal voltage from the re-
frigerant pressure sensor 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/ACCELER-
ATE switch signal.

SET SW

ON/OFF

Indicates [ON/OFF] condition 
from SET/COAST switch sig-
nal.

BRAKE SW1

ON/OFF

Indicates [ON/OFF] condition 
from brake pedal position 
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 main-
tained at the ASCD set speed.
CUT: Vehicle speed de-
creased to excessively low 
compared with the ASCD set 
speed, and ASCD operation is 
cut off.

Monitored item

Unit

Monitor Item Selection

Description

Remarks

MAIN

SIGNALS

ECU INPUT

SIGNALS