Infiniti Q45. Manual — part 370
TROUBLE DIAGNOSIS
EC-119
C
D
E
F
G
H
I
J
K
L
M
A
EC
*: The items are the same as those of 1st trip freeze frame data.
DATA MONITOR MODE
Monitored Item
×
: Applicable
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.
Freeze frame data
item*
Description
Monitored item
[Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
ENG SPEED
[rpm]
×
×
●
Indicates the engine speed computed from
the signals of the crankshaft position sensor
(POS) and camshaft position 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.
B/FUEL SCHDL
[msec]
×
●
“Base fuel schedule” indicates the fuel injec-
tion pulse width programmed into ECM, prior
to any learned on board correction.
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.
●
This data also includes the data for the
air-fuel ratio learning control.
A/F ALPHA-B2
[%]
×
COOLAN TEMP/S
[
°
C] or [
°
F]
×
×
●
The engine coolant temperature (determined
by the signal voltage of the engine coolant
temperature sensor) is displayed.
●
When the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant 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) [V]
×
HO2S2 (B1) [V]
×
●
The signal voltage of the heated oxygen sen-
sor 2 is displayed.
HO2S2 (B2) [V]
×
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)
[RICH/LEAN]
×
VHCL SPEED SE
[km/h] or [mph]
×
×
●
The vehicle speed computed from the vehicle
speed signal 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 converted by
ECM internally. Thus, it differs from
ECM terminal voltage signal.
ACCEL SEN 2 [V]
×
EC-120
TROUBLE DIAGNOSIS
THRTL SEN 1 [V]
×
×
●
The throttle position sensor signal voltage is
displayed.
●
THRTL SEN 2 signal is converted by
ECM internally. Thus, it differs from
ECM terminal voltage signal.
THRTL SEN 2 [V]
×
FUEL T/TEMP SE
[
°
C] or [
°
F]
×
●
The fuel temperature (determined by the sig-
nal voltage of the fuel tank temperature sen-
sor) is displayed.
INT/A TEMP SE
[
°
C] or [
°
F]
×
×
●
The intake air temperature (determined by the
signal voltage of the intake air temperature
sensor) is indicated.
EVAP SYS PRES
[V]
×
●
The signal voltage of EVAP control system
pressure sensor is displayed.
FPCM DR VOLT
[V]
●
The voltage between fuel pump and FPCM 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] com-
puted by the ECM according to the signals of
engine speed and battery voltage.
●
After starting the engine, [OFF] is dis-
played regardless of the starter signal.
CLSD THL POS
[ON/OFF]
×
×
●
Indicates idle position [ON/OFF] computed by
ECM according to the accelerator pedal posi-
tion sensor signal.
AIR COND SIG
[ON/OFF]
×
×
●
Indicates [ON/OFF] condition of the air condi-
tioner switch determined by the air conditioner
signal.
P/N POSI SW
[ON/OFF]
×
×
●
Indicates [ON/OFF] condition from the park/
neutral position (PNP) switch signal.
PW/ST SIGNAL
[ON/OFF]
×
×
●
[ON/OFF] condition of the power steering sys-
tem (determined by the signal voltage of the
power steering pressure sensor signal) is indi-
cated.
LOAD SIGNAL
[ON/OFF]
×
×
●
Indicates [ON/OFF] condition from the electri-
cal 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 ignition
switch.
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 indicated.
INJ PULSE-B2
[msec]
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 value of
the current airflow divided by peak airflow.
Monitored item
[Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
TROUBLE DIAGNOSIS
EC-121
C
D
E
F
G
H
I
J
K
L
M
A
EC
MASS AIRFLOW
[g·m/s]
●
Indicates the mass airflow 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 solenoid valve control value computed
by the ECM according to the input signals.
●
The opening becomes larger as the value
increases.
INT/V TIM (B1)
[
°
CA]
●
Indicates [
°
CA] of intake camshaft advanced
angle.
INT/V TIM (B2)
[
°
CA]
INT/V SOL (B1) [%]
●
The control value of the intake valve timing
control solenoid valve (determined by ECM
according to the input signal) is indicated.
●
The advance angle becomes larger as the
value increases.
INT/V SOL (B2)
[%]
VIAS S/V
[ON/OFF]
●
The control condition of the VIAS control sole-
noid valve (determined by ECM according to
the input signals) is indicated.
●
OFF: VIAS control solenoid valve is not oper-
ating.
ON: VIAS control solenoid valve is operating.
AIR COND RLY
[ON/OFF]
×
●
The air conditioner relay control condition
(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 according to the input
signals.
FPCM
[HI/LOW]
×
●
The control condition of the fuel pump control
module (FPCM) (determined by the ECM
according to the input signals) is indicated.
VC/V BYPASS/V
[ON/OFF]
●
The control condition of the vacuum cut valve
bypass valve (determined by ECM according
to the input signals) is indicated.
●
ON: Open
OFF: Closed
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 con-
trol condition determined by the ECM accord-
ing to the input signals.
COOLING FAN
[HI/MID/LOW/OFF]
●
The control condition of the cooling fan (deter-
mined by ECM according to the input signals)
is indicated.
HI: High speed operation
MID: Middle speed operation
LOW: Low speed operation
OFF: Stop
Monitored item
[Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
EC-122
TROUBLE DIAGNOSIS
HO2S2 HTR (B1)
[ON/OFF]
●
Indicates [ON/OFF] condition of heated oxy-
gen sensor 2 heater determined by ECM
according to the input signals.
HO2S2 HTR (B2)
[ON/OFF]
I/P PULLY SPD
[rpm]
●
Indicates the engine speed computed from
the turbine revolution sensor signal.
VEHICLE SPEED
[km/h] or [mph]
●
Indicates the vehicle speed computed from
the revolution sensor signal.
IDL A/V LEARN
[YET/CMPLT]
●
Display the condition of idle air volume learn-
ing.
YET: Idle Air Volume Learning has not been
performed yet.
CMPLT: Idle Air Volume Learning has already
been performed successfully.
TRVL AFTER MIL
[km] or [mile]
●
Distance traveled while MIL is activated.
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)
[%]
AC PRESS SEN
[V]
●
The signal voltage from the refrigerant pres-
sure 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.
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/
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 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 DIS-
TANCE 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 increased to excessively
high compared with the ASCD set speed, and
ASCD operation is cut off.
Monitored item
[Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
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