Infiniti QX56 (Z62). Manual — part 522
EC-66
< SYSTEM DESCRIPTION >
[VK56VD]
DIAGNOSIS SYSTEM (ECM)
A/F ALPHA-B1
%
• The mean value of the air-fuel ratio feedback cor-
rection factor per cycle is indicated.
• When the engine is stopped,
a certain value is indicated.
• This data also includes the
data for the air-fuel ratio
learning control.
• When engine is running,
specification range is indicat-
ed in “SPEC”.
A/F ALPHA-B2
COOLAN TEMP/S
°
C or
°
F
• The engine coolant temperature (determined by
the signal voltage of the engine coolant tempera-
ture sensor) is displayed.
• When the engine coolant
temperature sensor is open
or short-circuited, ECM en-
ters fail-safe mode. The en-
gine coolant temperature
determined by the ECM is
displayed.
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.
A/F SEN1 (B2)
HO2S2 (B1)
V
• The signal voltage of the heated oxygen sensor 2
is displayed.
HO2S2 (B2)
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.
HO2S2 MNTR (B2)
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 con-
verted by ECM internally.
Thus, they differs from ECM
terminal voltage signal.
ACCEL SEN 2
TP SEN 1-B1
V
• The throttle position sensor signal voltage is dis-
played.
• TP SEN 2-B1 signal is con-
verted by ECM internally.
Thus, they differs from ECM
terminal 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 temperature sensor) is dis-
played.
EVAP SYS PRES
V
• The signal voltage of EVAP control system pres-
sure sensor is displayed.
FUEL LEVEL SE
V
• The signal voltage of the fuel level sensor is dis-
played.
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 regard-
less 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.
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.
Monitored item
Unit
Description
Remarks
DIAGNOSIS SYSTEM (ECM)
EC-67
< SYSTEM DESCRIPTION >
[VK56VD]
C
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EC
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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 blower fan
ON 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 ac-
cording 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 air flow divided by peak air flow.
MASS AIRFLOW
g/s
• Indicates the mass air flow computed by ECM ac-
cording to the signal voltage of the mass air flow
sensor.
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 SOL (B1)
%
• The control value of the intake valve timing control
solenoid valve (determined by ECM according to
the input signals) is indicated.
• The advance angle becomes larger as the value
increases.
INT/V SOL (B2)
AIR COND RLY
ON/OFF
• The air conditioner relay control condition (deter-
mined by ECM according to the input signals) is in-
dicated.
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.
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)
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)
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.
I/P PULLY SPD
rpm
• Indicates the engine speed computed from the in-
put speed sensor signal.
Monitored item
Unit
Description
Remarks
EC-68
< SYSTEM DESCRIPTION >
[VK56VD]
DIAGNOSIS SYSTEM (ECM)
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 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.
SNOW MODE SW
ON/OFF
• Indicates [ON/OFF] condition from the snow mode
switch signal.
ENG OIL TEMP
°
C or
°
F
• The engine oil temperature (determined by the sig-
nal voltage of the engine oil temperature sensor) 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.
DIST SW
ON/OFF
• Indicates [ON/OFF] condition from DISTANCE
switch signal.
CRUISE LAMP
ON/OFF
• Indicates [ON/OFF] condition of CRUISE indicator
determined by the ECM according to the input sig-
nals.
AC EVA TEMP
°
C or
°
F
• Indicates A/C evaporator temperature sent from A/
C auto amp.
AC EVA TARGET
°
C or
°
F
• Indicates target A/C evaporator temperature sent
from A/C auto amp.
FAN DUTY
%
• Indicates a command value for cooling fan. The
value is calculated by ECM based on 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.
A/F ADJ-B1
—
• Indicates the correction of a factor stored in ECM.
The factor is calculated from the difference be-
tween the target air-fuel ratio stored in ECM and
the air-fuel ratio calculated from A/F sensor 1 sig-
nal.
A/F ADJ-B2
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 sig-
nal voltage of the intake air temperature sensor) is
indicated.
AC PRESS SEN
V
• The signal voltage from the refrigerant pressure
sensor is displayed.
FUEL PRES SEN
MPa
• Indicates the fuel rail pressure computed by ECM
according to the input signals
Monitored item
Unit
Description
Remarks
DIAGNOSIS SYSTEM (ECM)
EC-69
< SYSTEM DESCRIPTION >
[VK56VD]
C
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EC
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FUEL INJ B1
msec
• ECM-calculated injection pulse width of the fuel in-
jector on the Bank 1 side.
FUEL INJ B2
msec
• ECM-calculated injection pulse width of the fuel in-
jector on the Bank 2 side.
INT/V TIM (B1)
°
CA
• Indicates [
°
CA] of intake camshaft advance angle.
INT/V TIM (B2)
MAP SENSOR
V
• The signal voltage from the manifold absolute
pressure (MAP) sensor is displayed.
EVAP LEAK DIAG
YET/CMPLT
• Indicates the condition of EVAP leak diagnosis.
YET: EVAP leak diagnosis has not been performed
yet.
CMPLT: EVAP leak diagnosis has been performed
successfully.
EVAP DIAG READY
ON/OFF
• Indicates the ready condition of EVAP leak diagno-
sis.
ON: Diagnosis has been ready condition.
OFF: Diagnosis has not been ready condition.
VVEL LEARN
YET/DONE
• Display the condition of VVEL learning
YET: VVEL learning has not been performed yet.
DONE: VVEL learning has already been per-
formed successfully.
VVEL SEN LEARN-B1
V
• Indicates the VVEL learning value.
VVEL SEN LEARN-B2
VVEL POSITION SEN-B1
V
• The VVEL control shaft position sensor signal volt-
age is displayed.
VVEL POSITION SEN-B2
VVEL TIM-B1
deg
• Indicates [deg] of VVEL control shaft angle.
VVEL TIM-B2
FPCM
HI/MID/LOW/
OFF
• The control condition of the fuel pump control mod-
ule (FPCM) (determined by ECM according to the
input signals) is indicated.
BAT TEMP SEN
V
• The signal voltage from the battery temperature
sensor is displayed.
COOLING FAN SPD
rpm
• Displays a cooling fan speed from a signal of elec-
trically-controlled cooling fan coupling.
THRTL STK CNT B1*
—
—
HO2 S2 DIAG2(B1)*
INCMP/CM-
PLT
• Indicates DTC P0139 self-diagnosis (slow re-
sponse) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
HO2 S2 DIAG2(B2)*
INCMP/CM-
PLT
• Indicates DTC P0159 self-diagnosis (slow re-
sponse) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
FUEL INJ TIMG
deg
• Indicates the fuel injection timing computed by
ECM according to the input signals.
H/P FUEL PUMP DEG
deg
• Displays ECM-calculated fuel discharge position
of the high pressure fuel pump.
FUEL PRES SEN V
mV
• The signal voltage of FRP sensor is displayed.
L/FUEL PRES SEN
MPa
• Displays a pressure value calculated from a low
fuel pressure sensor voltage.
L/FUEL PRES SEN V
mV
• The signal voltage of low fuel pressure sensor is
displayed.
Monitored item
Unit
Description
Remarks
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