2001 INFINITI QX4 IDX

RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS EXCEPT
FOR ªMISFIRE º, ªFUEL INJECTION SYSTEMºNBEC0033S05
SEF393S
*1: When the same malfunction is
detected in two consecutive trips,
MIL will light up.
*2: MIL will go off after vehicle is
driven 3 times (pattern B) without
any malfunctions.
*3: When the same malfunction is
detected in two consecutive trips,
the DTC and the freeze frame
data will be stored in ECM.*4: The DTC and the freeze frame
data will not be displayed any
longer after vehicle is driven 40
times (pattern A) without the same
malfunction.
(The DTC and the freeze frame
data still remain in ECM.)
*5: When a malfunction is detected
for the first time, the 1st trip DTCand the 1st trip freeze frame data
will be stored in ECM.
*6: 1st trip DTC will be cleared after
vehicle is driven once (pattern B)
without the same malfunction.
*7: When the same malfunction is
detected in the 2nd trip, the 1st
trip freeze frame data will be
cleared.
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
OBD System Operation Chart (Cont'd)
EC-79

SEF941Y
CONSULT-II=NBEC0034CONSULT-II INSPECTION PROCEDURENBEC0034S011. Turn ignition switch OFF.
2. Connect CONSULT-II to data link connector, which is located
under LH dash panel near the fuse box cover.
PBR455D
3. Turn ignition switch ON.
4. Touch ªSTARTº.
SEF948Y
5. Touch ªENGINEº.
SEF949Y
6. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT-II Operation
Manual.
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II
EC-81

ItemDIAGNOSTIC TEST MODE
WORK
SUP-
PORTSELF-DIAGNOSTIC
RESULTS
D ATA
MONI-
TORD ATA
MONI-
TOR
(SPEC)ACTIVE
TESTDTC & SRT
CONFIRMATION
DTC*1FREEZE
FRAME
DATA*2SRT
STATUSDTC
WORK
SUP-
PORT
ENGINE CONTROL COMPONENT PARTS
OUTPUT
Injectors X X X
Power transistor (Ignition timing)X
(Ignition
signal)XXX
IACV-AAC valve X X X X
EVAP canister purge volume
control solenoid valveX XXX X
Air conditioner relay X X
Fuel pump relay X X X X
Heated oxygen sensor 1 (front)
heaterXXXX
Heated oxygen sensor 2 (rear)
heaterXXXX
EVAP canister vent control valve X X X X
Vacuum cut valve bypass valve X X X X X
Swirl control valve control sole-
noid valveX XXX
VIAS control solenoid valve X X X
Intake valve timing control sole-
noid valveX XXX
Calculated load value X X X
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.
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
EC-83

WORK SUPPORT MODE=NBEC0034S04
WORK ITEM CONDITION USAGE
TP SW/TP SEN IDLE POSI ADJIFOLLOW THE BASIC INSPECTION INSTRUCTION IN
THE SERVICE MANUAL.When adjusting the idle throttle
position
FUEL PRESSURE RELEASEIFUEL PUMP WILL STOP BY TOUCHING ªSTARTº
DURING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.When releasing fuel pressure
from fuel line
IDLE AIR VOL LEARNITHE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.When learning the idle air volume
SELF-LEARNING CONTITHE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL
COEFFICIENT.When clearing the coefficient of
self-learning control valve
EVAP SYSTEM CLOSE OPEN THE VACUUM CUT VALVE BYPASS VALVE AND
CLOSE THE EVAP CANISTER VENT CONTROL VALVE
IN ORDER TO MAKE EVAP SYSTEM CLOSE UNDER
THE FOLLOWING CONDITIONS.
IIGN SW ªONº
IENGINE NOT RUNNING
IAMBIENT TEMPERATURE IS ABOVE 0ÉC (32ÉF).
INO VACUUM AND NO HIGH PRESSURE IN EVAP
SYSTEM
ITANK FUEL TEMP. IS MORE THAN 0ÉC (32ÉF).
IWITHIN 10 MINUTES AFTER STARTING ªEVAP SYS-
TEM CLOSEº
IWHEN TRYING TO EXECUTE ªEVAP SYSTEM
CLOSEº UNDER THE CONDITION EXCEPT ABOVE,
CONSULT-II WILL DISCONTINUE IT AND DISPLAY
APPROPRIATE INSTRUCTION.
NOTE:
WHEN STARTING ENGINE, CONSULT-II MAY DIS-
PLAY ªBATTERY VOLTAGE IS LOW. CHARGE
BATTERYº, EVEN IN USING CHARGED BATTERY.When detecting EVAP vapor leak
point of EVAP system
TARGET IGNITION TIMING ADJ*IIDLE CONDITIONIWhen adjusting target ignition
timing
After adjustment, confirm target
ignition timing with a timing
light.
IIf once the ªTARGET IDLE
RPM ADJº has been done, the
Idle Air Volume Learning proce-
dure will not be completed.
TARGET IDLE RPM ADJ*IIDLE CONDITION When setting target idle speed
*: This function is not necessary in the usual service procedure.
SELF-DIAGNOSTIC MODENBEC0034S05DTC and 1st Trip DTCNBEC0034S0501Regarding items of ªDTC and 1st trip DTCº, refer to ªTROUBLE
DIAGNOSIS Ð INDEXº (See EC-8.)
Freeze Frame Data and 1st Trip Freeze Frame DataNBEC0034S0502
Freeze frame data
item*1Description
DIAG TROUBLE
CODE
[PXXXX]IThe engine control component part/control system has a trouble code, it is displayed as ªPXXXXº.
(Refer to ªTROUBLE DIAGNOSIS Ð INDEXº, EC-8.)
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
EC-85

DATA MONITOR MODE=NBEC0034S06
Monitored item [Unit]ECM
input
signalsMain
signalsDescription Remarks
ENG SPEED [rpm]qqIIndicates the engine speed computed
from the REF signal (120É signal) of the
crankshaft position sensor (REF).
CKPS´RPM (POS)
[rpm]qIIndicates the engine speed computed
from the POS signal (1É signal) of the
crankshaft position sensor (POS).IAccuracy becomes poor if engine
speed drops below the idle rpm.
IIf the signal is interrupted while the
engine is running, an abnormal value
may be indicated.
POS COUNTqIIndicates the number of signal plate
(Flywheel/Drive Plate) cogs (tooth) dur-
ing one revolution of the engine.
MAS A/F SE-B1 [V]qqIThe signal voltage of the mass air flow
sensor is displayed.IWhen the engine is stopped, a certain
value is indicated.
COOLAN TEMP/S
[ÉC] or [ÉF]qqIThe engine coolant temperature (deter-
mined by the signal voltage of the
engine coolant temperature sensor) is
displayed.IWhen 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.
HO2S1 (B1) [V]qq
IThe signal voltage of the front heated
oxygen sensor is displayed.
HO2S1 (B2) [V]qq
HO2S2 (B1) [V]qq
IThe signal voltage of the rear heated
oxygen sensor is displayed.
HO2S2 (B2) [V]qq
HO2S1 MNTR (B1)
[RICH/LEAN]qIDisplay of front heated oxygen sensor
signal during air-fuel ratio feedback
control:
RICH ... means the mixture became
ªrichº, and control is being affected
toward a leaner mixture.
LEAN ... means the mixture became
ªleanº, and control is being affected
toward a rich mixture.IAfter turning ON the ignition switch,
ªRICHº is displayed until air-fuel mixture
ratio feedback control begins.
IWhen the air-fuel ratio feedback is
clamped, the value just before the
clamping is displayed continuously. HO2S1 MNTR (B2)
[RICH/LEAN]q
HO2S2 MNTR (B1)
[RICH/LEAN]qIDisplay of rear heated oxygen sensor
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.IWhen the engine is stopped, a certain
value is indicated.
HO2S2 MNTR (B2)
[RICH/LEAN]q
VHCL SPEED SE
[km/h] or [mph]qqIThe vehicle speed computed from the
vehicle speed sensor signal is dis-
played.
BATTERY VOLT [V]qqIThe power supply voltage of ECM is
displayed.
THRTL POS SEN [V]qqIThe throttle position sensor signal volt-
age is displayed.
FUEL T/TMP SE
[ÉC] or [ÉF]IThe fuel temperature judged from the
tank fuel temperature sensor signal
voltage is displayed.GI
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
EC-87

Monitored item [Unit]ECM
input
signalsMain
signalsDescription Remarks
IGN TIMING [BTDC]qIIndicates the ignition timing computed
by ECM according to the input signals.IWhen the engine is stopped, a certain
value is indicated.
IACV-AAC/V [step]qIIndicates the IACV-AAC valve control
value computed by ECM according to
the input signals.
PURG VOL C/V [%]IIndicates the EVAP canister purge vol-
ume control solenoid valve control
value computed by the ECM according
to the input signals.
IThe opening becomes larger as the
value increases.
A/F ALPHA-B1 [%]q
IThe mean value of the air-fuel ratio
feedback correction factor per cycle is
indicated.IWhen the engine is stopped, a certain
value is indicated.
IThis data also includes the data for the
air-fuel ratio learning control. A/F ALPHA-B2 [%]q
AIR COND RLY
[ON/OFF]qIThe air conditioner relay control condi-
tion (determined by ECM according to
the input signal) is indicated.
FUEL PUMP RLY
[ON/OFF]qIIndicates the fuel pump relay control
condition determined by ECM accord-
ing to the input signals.
VENT CONT/V
[ON/OFF]IThe control condition of the EVAP can-
ister vent control valve (determined by
ECM according to the input signal) is
indicated.
ION ... Closed
OFF ... Open
HO2S1 HTR (B1)
[ON/OFF]IIndicates [ON/OFF] condition of front
heated oxygen sensor heater deter-
mined by ECM according to the input
signals. HO2S1 HTR (B2)
[ON/OFF]
HO2S2 HTR (B1)
[ON/OFF]IIndicates [ON/OFF] condition of rear
heated oxygen sensor heater deter-
mined by ECM according to the input
signals. HO2S2 HTR (B2)
[ON/OFF]
VC/V BYPASS/V
[ON/OFF]IThe control condition of the vacuum cut
valve bypass valve (determined by
ECM according to the input signal) is
indicated.
ION ... Open
OFF ... Closed
CAL/LD VALUE [%]IªCalculated load valueº indicates the
value of the current airflow divided by
peak airflow.
ABSOL TH´P/S [%]IªAbsolute throttle position sensorº indi-
cates the throttle opening computed by
ECM according to the signal voltage of
the throttle position sensor.
MASS AIRFLOW
[g´m/s]IIndicates the mass airflow computed by
ECM according to the signal voltage of
the mass airflow sensor.GI
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
EC-89

Monitored item [Unit]ECM
input
signalsMain
signalsDescription Remarks
A/F ALPHA-B1 [%]q
IIndicates the mean value of the air-fuel ratio
feedback correction factor per cycle.IWhen the engine is running, specifi-
cation range is indicated.
IThis data also includes the data for
the air-fuel ratio learning control. A/F ALPHA-B2 [%]q
NOTE:
IAny monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
IRegarding R50 model, ªB1º indicates bank 1 and ªB2º indicates bank 2.
ACTIVE TEST MODENBEC0034S07
TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY)
FUEL INJECTIONIEngine: Return to the original
trouble condition
IChange the amount of fuel injec-
tion using CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.IHarness and connector
IFuel injectors
IHeated oxygen sensor
IGNITION TIMINGIEngine: Return to the original
trouble condition
ITiming light: Set
IRetard the ignition timing using
CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.IAdjust initial ignition timing
IACV-AAC/V
OPENINGIEngine: After warming up, idle
the engine.
IChange the IACV-AAC valve
opening percent using CON-
SULT-II.Engine speed changes according
to the opening percent.IHarness and connector
IIACV-AAC valve
POWER BAL-
ANCEIEngine: After warming up, idle
the engine.
IA/C switch ªOFFº
IShift lever ªNº
ICut off each injector signal one
at a time using CONSULT-II.Engine runs rough or dies.IHarness and connector
ICompression
IInjectors
IPower transistor
ISpark plugs
IIgnition coils
ENG COOLANT
TEMPIEngine: Return to the original
trouble condition
IChange the engine coolant tem-
perature using CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.IHarness and connector
IEngine coolant temperature sen-
sor
IFuel injectors
FUEL PUMP
RELAYIIgnition switch: ON
(Engine stopped)
ITurn the fuel pump relay ªONº
and ªOFFº using CONSULT-II
and listen to operating sound.Fuel pump relay makes the operat-
ing sound.IHarness and connector
IFuel pump relay
VIAS SOL VALVEIIgnition switch: ON
ITurn solenoid valve ªONº and
ªOFFº with CONSULT-II and lis-
ten for operating sound.Solenoid valve makes an operating
sound.IHarness and connector
ISolenoid valve
SWIRL CONT
S O L VA LV EIIgnition switch: ON
ITurn solenoid valve ªONº and
ªOFFº with CONSULT-II and lis-
ten for operating sound.Solenoid valve makes an operating
sound.IHarness and connector
ISolenoid valve
PURG VOL
CONT/VIEngine: After warming up, run
engine at 1,500 rpm.
IChange the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-II.Engine speed changes according
to the opening percent.IHarness and connector
ISolenoid valve
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
EC-91

DTC Work Support ModeNBEC0034S0802
Test mode Test item Condition Reference page
EVAPORATIVE SYSTEMEVAP SML LEAK P0440
Refer to corresponding
trouble diagnosis for
DTC.EC-352
EVAP VERY SML LEAK P1441 EC-526
PURG VOL CN/V P1444 EC-541
PURGE FLOW P1447 EC-561
VC CUT/V BP/V P1491 EC-591
HEATED OXYGEN SEN-
SOR 1 (FRONT)HO2S1 (B1) P0130 EC-192
HO2S1 (B1) P0131 EC-202
HO2S1 (B1) P0132 EC-210
HO2S1 (B1) P0133 EC-218
HO2S1 (B2) P0150 EC-192
HO2S1 (B2) P0151 EC-202
HO2S1 (B2) P0152 EC-210
HO2S1 (B2) P0153 EC-218
HEATED OXYGEN SEN-
SOR 2 (REAR)HO2S2 (B1) P0137 EC-247
HO2S2 (B1) P0138 EC-257
HO2S2 (B1) P0139 EC-267
HO2S2 (B2) P0157 EC-247
HO2S2 (B2) P0158 EC-257
HO2S2 (B2) P0159 EC-267
SEF705Y
SEF707X
REAL TIME DIAGNOSIS IN DATA MONITOR MODE
(RECORDING VEHICLE DATA)
NBEC0034S10CONSULT-II has two kinds of triggers and they can be selected by
touching ªSETTINGº in ªDATA MONITORº mode.
1) ªAUTO TRIGº (Automatic trigger):
IThe malfunction will be identified on the CONSULT-II screen in
real time.
In other words, DTC/1st trip DTC and malfunction item will be
displayed if the malfunction is detected by ECM.
At the moment a malfunction is detected by ECM, ªMONITORº
in ªDATA MONITORº screen is changed to ªRecording Data ...
xx%º as shown at left, and the data after the malfunction detec-
tion is recorded. Then when the percentage reached 100%,
ªREAL-TIME DIAGº screen is displayed. If ªSTOPº is touched
on the screen during ª Recording Data ... xx%º, ªREAL-TIME
DIAGº screen is also displayed.
The recording time after the malfunction detection and the
recording speed can be changed by ªTRIGGER POINTº and
ªRecording Speedº. Refer to CONSULT-II OPERATION
MANUAL.
2) ªMANU TRIGº (Manual trigger):
IDTC/1st trip DTC and malfunction item will not be displayed
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
EC-93