Nissan Juke F15. Manual - part 318

DIAGNOSIS SYSTEM (ECM)

EC-85

< SYSTEM DESCRIPTION >

[MR FOR NISMO RS MODELS]

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How to Erase DTC and 1st Trip DTC

NOTE:

• If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10

seconds and then turn it ON (engine stopped) again.

• If the DTC is not for CVT related items (see 

EC-115, "DTC Index"

), skip step 1.

1. Erase DTC in TCM. Refer to 

TM-190, "CONSULT Function"

.

2. Select “ENGINE” with CONSULT.
3. Select “SELF-DIAG RESULTS”.
4. Touch “ERASE”. (DTC in ECM will be erased.)

Freeze Frame Data and 1st Trip Freeze Frame Data

*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE

NOTE:

The following table includes information (items) inapplicable to this vehicle. For information (items) applicable

to this vehicle, refer to CONSULT display items.

Monitored Item

For reference values of the following items, refer to 

EC-96, "Reference Value"

.

Freeze frame data 

item*

Description

DIAG TROUBLE 
CODE
[PXXXX]

• The engine control component part/control system has a trouble code the is displayed as PXXXX. (Refer to 

EC-115, "DTC Index"

.)

FUEL SYS-B1

• “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One of the following mode is displayed.

Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop

FUEL SYS-B2

CAL/LD VALUE [%]

• The calculated load value at the moment a malfunction is detected is displayed.

COOLANT TEMP [

°C] 

or [

°F]

• The engine coolant temperature at the moment a malfunction is detected is displayed.

L-FUEL TRM-B1 [%]

• “Long-term fuel trim” at the moment a malfunction is detected is displayed.
• The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than 

short-term fuel trim.

L-FUEL TRM-B2 [%]

S-FUEL TRM-B1 [%]

• “Short-term fuel trim” at the moment a malfunction is detected is displayed.
• The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel sched-

ule.

S-FUEL TRM-B2 [%]

ENGINE SPEED [rpm] • The engine speed at the moment a malfunction is detected is displayed.

VEHICL SPEED
[km/h] or [mph]

• The vehicle speed at the moment a malfunction is detected is displayed.

ABSOL TH·P/S [%]

• The throttle valve opening angle at the moment a malfunction is detected is displayed.

B/FUEL SCHDL 
[msec]

• The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE [

°C] 

or [

°F]

• The intake air temperature at the moment a malfunction is detected is displayed.

INT MANI PRES [kPa]

• These items are displayed but are not applicable to this model.

COMBUST CONDI-
TION

EC-86

< SYSTEM DESCRIPTION >

[MR FOR NISMO RS MODELS]

DIAGNOSIS SYSTEM (ECM)

×: Applicable

Monitored item

Unit

Monitor Item Selec-

tion

Description

Remarks

ECU IN-

PUT 
SIG-

NALS

MAIN 

SIG-

NALS

ENG SPEED

rpm

×

×

Indicates the engine speed computed 
from the signal of the crankshaft posi-
tion sensor (POS) and camshaft posi-
tion sensor (PHASE).

• Accuracy becomes poor if 

engine speed drops below 
the idle rpm.

• If the signal is interrupted 

while the engine is running, 
an abnormal value may be 
indicated.

MAS A/F SE-B1

V

×

×

The signal voltage of the mass air flow 
sensor is displayed.

• When the engine is 

stopped, a certain value is 
indicated.

• When engine is running 

specification range is indi-
cated in “SPEC”.

B/FUEL SCHDL

msec

×

×

“Base fuel schedule” indicates the fuel 
injection pulse width programmed into 
ECM, prior to any learned on board 
correction.

When engine is running speci-
fication range is indicated in 
“SPEC”.

A/F ALPHA-B1

%

The mean value of the air-fuel ratio 
feedback correction factor per cycle is 
indicated.

• When the engine is 

stopped, a certain value is 
indicated.

• When engine is running 

specification range is indi-
cated in “SPEC”.

• This data also includes the 

data for the air-fuel ratio 
learning control.

COOLANT TEMP/S

°C or °F

×

×

The engine coolant temperature (de-
termined by the signal voltage of the 
engine coolant temperature sensor) is 
displayed.

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 in-
put signal of the air fuel ratio (A/F) sen-
sor 1 is displayed.

HO2S2 (B1)

V

×

×

The signal voltage of the heated oxy-
gen sensor 2 is displayed.

HO2S2 MNTR(B1)

RICH/LEAN

×

• Display of heated oxygen sensor 2 

signal:

- RICH: means the amount of oxygen 

after three way catalyst is relatively 
small.

- LEAN: means the amount of oxygen 

after three way catalyst 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 combi-
nation meter is displayed.

BATTERY VOLT

V

The power supply voltage of ECM is 
displayed.

DIAGNOSIS SYSTEM (ECM)

EC-87

< SYSTEM DESCRIPTION >

[MR FOR NISMO RS MODELS]

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ACCEL SEN 1

V

The accelerator pedal position sensor 
signal voltage is displayed.

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 volt-
age 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

×

×

FUEL T/TMP SE

°C or °F

The fuel temperature (determined by 
the signal voltage of the fuel tank tem-
perature sensor) is displayed.

EVAP SYS PRES

V

The signal voltage of EVAP control 
system pressure sensor is displayed.

FUEL LEVEL SE

V

×

The signal voltage of the fuel level sen-
sor is displayed.

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] com-
puted by ECM according to the accel-
erator 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.

PW/ST SIGNAL

ON/OFF

×

×

[ON/OFF] condition of the power steer-
ing system (determined by the signal 
sent from EPS control unit) is indicat-
ed.

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 lighting switch are OFF.

IGNITION SW

ON/OFF

×

×

Indicates [ON/OFF] condition from ig-
nition 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.

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.

COMBUSTION

—

These items are displayed but are not 
applicable to this model.

CAL/LD VALUE

%

“Calculated load value” indicates the 
value of the current airflow divided by 
peak airflow.

MASS AIRFLOW

g/s

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

Monitored item

Unit

Monitor Item Selec-

tion

Description

Remarks

ECU IN-

PUT 
SIG-

NALS

MAIN 

SIG-

NALS

EC-88

< SYSTEM DESCRIPTION >

[MR FOR NISMO RS MODELS]

DIAGNOSIS SYSTEM (ECM)

PURG VOL C/V

%

• Indicates the EVAP canister purge 

volume control solenoid valve con-
trol value computed by the ECM ac-
cording to the input signals.

• The opening becomes larger as the 

value increases.

INT/V TIM(B1)

°CA

Indicates [

°CA] of intake camshaft ad-

vance angle. 

EXHV TIM B1

°CA

Indicates [

°CA] of exhaust camshaft 

advance angle. 

INT/V SOL(B1)

%

• The control value of the intake valve 

timing control solenoid valve (deter-
mined by ECM according to the in-
put signals) is indicated.

• The advance angle becomes larger 

as the value increases.

AIR COND RLY

ON/OFF

The air conditioner relay control condi-
tion (determined by ECM according to 
the input signals) is indicated.

FUEL PUMP RLY

ON/OFF

Indicates the fuel pump relay control 
condition determined by ECM accord-
ing to the input signals.

VENT CONT/V

ON/OFF

• The control condition of the EVAP 

canister vent control valve (deter-
mined by ECM according to the in-
put signals) is displayed.

- ON: Closed
- OFF: Open

THRTL RELAY

ON/OFF

Indicates the throttle control motor re-
lay control condition determined by the 
ECM according to the input signals.

HO2S2 HTR (B1)

ON/OFF

Indicates [ON/OFF] condition of heat-
ed 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 vari-

able control is active.

- OFF: Power generation

I/P PULLY SPD

rpm

Indicates the engine speed computed 
from the input speed sensor signal.

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

• Display the condition of Idle Air Vol-

ume Learning

- YET: Idle air volume learning has not 

been performed yet.

- CMPLT: Idle air volume learning has 

already been performed successful-
ly.

Monitored item

Unit

Monitor Item Selec-

tion

Description

Remarks

ECU IN-

PUT 
SIG-

NALS

MAIN 

SIG-

NALS