Nissan X-Trail 32. Manual — part 841
DIAGNOSIS SYSTEM (ECM)
EC-493
< SYSTEM DESCRIPTION >
[QR25DE]
C
D
E
F
G
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K
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M
A
EC
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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 >
[QR25DE]
C
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EC
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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
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