Infiniti M35/M45 Y50. Manual — part 413
TROUBLE DIAGNOSIS
EC-125
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to
EC-60, "FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME
*3: Always “CMPLT” is displayed.
INSPECTION PROCEDURE
Refer to
GI-38, "CONSULT-II Start Procedure"
.
WORK SUPPORT MODE
Work Item
ENGINE
CO
NT
R
O
L
COMPONENT P
ARTS
OUTPUT
Fuel injector
×
×
×
Power transistor (Ignition timing)
×
×
×
Throttle control motor relay
×
×
×
Throttle control motor
×
EVAP canister purge volume con-
trol solenoid valve
×
×
×
×
×
FPCM
×
×
×
×
Air conditioner relay
×
×
Fuel pump relay
×
×
×
×
Cooling fan relay
×
×
×
×
Air fuel ratio (A/F) sensor 1 heater
×
×
×
×
*
3
Heated oxygen sensor 2 heater
×
×
×
×
*
3
EVAP canister vent control valve
×
×
×
×
×
Intake valve timing control solenoid
valve
×
×
×
×
Alternator
×
×
×
Calculated load value
×
×
×
Item
DIAGNOSTIC TEST MODE
WORK
SUP-
PORT
SELF-DIAGNOS-
TIC RESULTS
DATA
MONI-
TOR
DATA
MONI-
TOR
(SPEC)
ACTIVE
TEST
DTC & SRT
CONFIRMATION
DTC*1
FREEZE
FRAME
DATA*2
SRT
STATUS
DTC
WORK
SUP-
PORT
WORK ITEM
CONDITION
USAGE
FUEL PRESSURE RELEASE
●
FUEL PUMP WILL STOP BY TOUCHING “START” DUR-
ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.
When releasing fuel pressure
from fuel line
IDLE AIR VOL LEARN
●
THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.
When learning the idle air volume
SELF-LEARNING CONT
●
THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.
When clearing the coefficient of
self-learning control value
EC-126
[VQ35DE]
TROUBLE DIAGNOSIS
*: This function is not necessary in the usual service procedure.
SELF-DIAG RESULTS MODE
Self Diagnostic Item
Regarding items of DTC and 1st trip DTC, refer to
EC-55, "EMISSION-RELATED DIAGNOSTIC INFORMA-
Freeze Frame Data and 1st Trip Freeze Frame Data
EVAP SYSTEM CLOSE
CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN
ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE
FOLLOWING CONDITIONS.
●
IGN SW ON
●
ENGINE NOT RUNNING
●
AMBIENT TEMPERATURE IS ABOVE 0
°
C (32
°
F).
●
NO VACUUM AND NO HIGH PRESSURE IN EVAP SYS-
TEM
●
FUEL TANK TEMP. IS MORE THAN 0
°
C (32
°
F).
●
WITHIN 10 MINUTES AFTER STARTING “EVAP SYS-
TEM CLOSE”
●
WHEN TRYING TO EXECUTE “EVAP SYSTEM CLOSE”
UNDER THE CONDITION EXCEPT ABOVE, CONSULT-
II WILL DISCONTINUE IT AND DISPLAY APPROPRI-
ATE INSTRUCTION.
NOTE:
WHEN STARTING ENGINE, CONSULT-II MAY DISPLAY
“BATTERY VOLTAGE IS LOW. CHARGE BATTERY”,
EVEN IN USING CHARGED BATTERY.
When detecting EVAP vapor leak
point of EVAP system
VIN REGISTRATION
●
IN THIS MODE VIN IS REGISTERED IN ECM
When registering VIN in ECM
TARGET IDLE RPM ADJ*
●
IDLE CONDITION
When setting target idle speed
TARGET IGN TIM ADJ*
●
IDLE CONDITION
When adjusting target ignition tim-
ing
WORK ITEM
CONDITION
USAGE
Freeze frame data
item*
Description
DIAG TROUBLE
CODE
[PXXXX]
●
The engine control component part/control system has a trouble code, it is displayed as PXXXX. (Refer to
EC-55, "EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS"
.)
FUEL SYS-B1
●
“Fuel injection system status” at the moment a malfunction is detected is displayed.
●
One mode in the following 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
schedule.
S-FUEL TRM-B2 [%]
ENGINE SPEED
[rpm]
●
The engine speed at the moment a malfunction is detected is displayed.
TROUBLE DIAGNOSIS
EC-127
[VQ35DE]
C
D
E
F
G
H
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J
K
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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 signal of the crankshaft position
sensor (POS) and camshaft position sen-
sor (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
injection pulse width programmed into
ECM, prior to any learned on board cor-
rection.
A/F ALPHA-B1 [%]
×
●
The mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.
●
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 (deter-
mined 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 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) [V]
×
HO2S2 (B1) [V]
×
●
The signal voltage of the heated oxygen
sensor 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 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 SENS 2 signal is converted be
ECM internally. Thus, they differs from
ECM terminal voltage signal.
ACCEL SEN 2 [V]
×
EC-128
[VQ35DE]
TROUBLE DIAGNOSIS
THRTL SEN 1 [V]
×
×
●
The throttle position sensor signal voltage
is displayed.
●
THRTL SEN 2 signal is converted by
ECM internally. Thus, they differs from
ECM terminal voltage signal.
THRTL SEN 2 [V]
×
FUEL T/TMP SE
[
°
C] or [
°
F]
×
●
The fuel temperature (determined by the
signal voltage of the fuel tank tempera-
ture sensor) is displayed.
INT/A TEMP SE
[
°
C] or [
°
F]
×
×
●
The intake air temperature (determined
by the signal voltage of the intake air tem-
perature sensor) is indicated.
EVAP SYS PRES
[V]
×
●
The signal voltage of EVAP control sys-
tem 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]
computed by the ECM according to the
signals of engine speed and battery volt-
age.
●
After starting the engine, [OFF] is dis-
played regardless of the starter signal.
CLSD THL POS
[ON/OFF]
×
×
●
Indicates idle position [ON/OFF] com-
puted by ECM according to the accelera-
tor 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.
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
system (determined by the signal voltage
of the power steering pressure sensor
signal) 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 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 air flow divided by
peak air flow.
Monitored item
[Unit]
ECM
INPUT
SIG-
NALS
MAIN
SIG-
NALS
Description
Remarks
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