Nissan X-Trail 32. Manual - part 841

DIAGNOSIS SYSTEM (ECM)

EC-493

< SYSTEM DESCRIPTION >

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Monitored item

Unit

Monitor Item 

Selection

Description

Remarks

ECU 

IN-

PUT 
SIG-

NALS

MAIN 

SIG-

NAL

S

ENG SPEED

rpm

×

×

• Indicates the engine speed computed 

from the signal of the crankshaft position 
sensor (POS) and camshaft position sen-
sor (PHASE).

• Accuracy becomes poor if en-

gine speed drops below the 
idle rpm.

• If the signal is interrupted while 

the engine is running, an ab-
normal value may be indicat-
ed.

B/FUEL SCHDL

msec

×

×

• “Base fuel schedule” indicates the fuel in-

jection pulse width programmed into 
ECM, prior to any learned on board cor-
rection.

• When engine is running, spec-

ification range is indicated in 
“SPEC”.

A/F ALPHA-B1

%

• The mean value of the air-fuel ratio feed-

back correction factor per cycle is indicat-
ed.

• When the engine is stopped, a 

certain value is indicated.

• When engine is running, spec-

ification range is indicated in 
“SPEC”.

• This data also includes the 

data for the air-fuel ratio learn-
ing control.

COOLAN TEMP/S

°

C or 

°

F

×

×

• The engine coolant temperature (deter-

mined 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 displayed.

HO2S2 (B1)

V

×

×

• The signal voltage of the heated oxygen 

sensor 2 is displayed.

HO2S2 MNTR(B1)

RICH/LEAN

×

• Display of heated oxygen sensor 2 sig-

nal.

- 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 combina-
tion meter is displayed.

BATTERY VOLT

V

• The power supply voltage of ECM is dis-

played.

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 convert-

ed by ECM internally. Thus, it 
differs from ECM terminal volt-
age signal.

TP SEN 2-B1

×

×

FUEL T/TMP SE

°

C or 

°

F

• The fuel temperature (determined by the 

signal voltage of the fuel tank tempera-
ture sensor) is displayed.

EC-494

< SYSTEM DESCRIPTION >

[QR25DE]

DIAGNOSIS SYSTEM (ECM)

EVAP SYS PRES

V

• The signal voltage of EVAP control sys-

tem pressure sensor is displayed.

FUEL LEVEL SE

V

×

• The signal voltage of the fuel level sensor 

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 volt-
age.

• After starting the engine, [OFF] 

is displayed regardless of the 
starter signal.

CLSD THL POS

On/Off

×

×

• Indicates idle position [ON/OFF] comput-

ed 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.

PW/ST SIGNAL

On/Off

×

×

• [ON/OFF] condition of the power steering 

system (determined by the signal sent 
from EPS control unit) 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 lighting switch are OFF.

IGNITION SW

On/Off

×

×

• Indicates [ON/OFF] condition from igni-

tion 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 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” indicates the val-

ue 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 vol-

ume control solenoid valve control value 
computed by the ECM according to the 
input signals.

• The opening becomes larger as the val-

ue increases.

INT/V TIM(B1)

°

CA

• Indicates [

°

CA] of intake camshaft ad-

vance angle. 

EXH/V TIM B1

°

CA

• Indicates [

°

CA] of exhaust camshaft ad-

vance angle. 

Monitored item

Unit

Monitor Item 

Selection

Description

Remarks

ECU 

IN-

PUT 
SIG-

NALS

MAIN 

SIG-

NAL

S

DIAGNOSIS SYSTEM (ECM)

EC-495

< SYSTEM DESCRIPTION >

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INT/V SOL(B1)

%

• The control value of the intake valve tim-

ing control solenoid valve (determined by 
ECM according to the input signals) is in-
dicated.

• The advance angle becomes larger as 

the value increases.

SWRL CONT S/V

On/Off

• The control condition of the intake mani-

fold runner control valve (determined by 
ECM according to the input signals) is in-
dicated.

- On: Closed
- Off: Open

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 con-

dition determined by ECM according to 
the input signals.

VENT CONT/V

On/Off

• The control condition of the EVAP canis-

ter vent control valve (determined by 
ECM according to the input signals) is in-
dicated.

- 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/Mid/Low/Off

• Indicates the condition of the cooling fan 

(determined by ECM according to the in-
put signals).

- Hi: High speed operation
- Mid: Middle 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.

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

• Displays the condition of Idle Air Volume 

Learning

- YET: Idle air volume learning has not 

been performed yet.

- CMPLT: Idle air volume learning has al-

ready been performed 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 voltage of the engine oil 
temperature sensor) is displayed.

Monitored item

Unit

Monitor Item 

Selection

Description

Remarks

ECU 

IN-

PUT 
SIG-

NALS

MAIN 

SIG-

NAL

S

EC-496

< SYSTEM DESCRIPTION >

[QR25DE]

DIAGNOSIS SYSTEM (ECM)

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.

VHCL SPEED SE

km/h or mph

• The vehicle speed computed from the 

vehicle speed signal sent from combina-
tion meter 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 CAN-

CEL switch signal.

RESUME/ACC SW

On/Off

• Indicates [ON/OFF] condition from RE-

SUME/ACCELERATE 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 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 maintained at the 

ASCD set speed.

- Cut: Vehicle speed decreased to exces-

sively low compared with the ASCD set 
speed, and ASCD operation 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 exces-

sively low, and ASCD operation is cut off.

AT OD MONITOR

On/Off

• Indicates [ON/OFF] condition of CVT O/

D according to the input signal from the 
TCM.

AT OD CANCEL

On/Off

• Indicates [ON/OFF] condition of CVT O/

D cancel request signal.

CRUISE LAMP

On/Off

• Indicates [ON/OFF] condition of CRUISE 

lamp determined by the ECM according 
to the input signals.

SET LAMP

On/Off

• Indicates [ON/OFF] condition of SET 

lamp determined by the ECM according 
to the input signals.

A/F ADJ-B1

—

• Indicates the correction of factor stored in 

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

TUMBLE POS SEN

V

• The intake manifold runner control valve 

position sensor signal voltage is dis-
played.

Monitored item

Unit

Monitor Item 

Selection

Description

Remarks

ECU 

IN-

PUT 
SIG-

NALS

MAIN 

SIG-

NAL

S