INFINITI QX4 2001 Factory Workshop Manual

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HOW TO ERASE DTC (WITH GST)NBAT0016S041. If the ignition switch stays ªONº after repair work, be sure to turn ignition switch ªOFFº once. Wait at least
5 seconds and then turn it ªONº (engine stopped) again.
2. Perform ªOBD-II SELF-DIAGNOSTIC PROCEDURE (No Tools)º. Refer to AT-46. (The engine warm-up
step can be skipped when performing the diagnosis only to erase the DTC.)
3. Select Mode 4 with Generic Scan Tool (GST). For details, refer to EC-95, ªDESCRIPTIONº.
HOW TO ERASE DTC (NO TOOLS)NBAT0016S051. If the ignition switch stays ªONº after repair work, be sure to turn ignition switch ªOFFº once. Wait at least
5 seconds and then turn it ªONº (engine stopped) again.
2. Perform ªTCM SELF-DIAGNOSTIC PROCEDURE (No Tools)º. Refer to AT-46. (The engine warm-up step
can be skipped when performing the diagnosis only to erase the DTC.)
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
OBD-II Diagnostic Trouble Code (DTC) (Cont'd)
AT-36

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Malfunction Indicator Lamp (MIL)=NBAT0183The MIL is located on the instrument panel.
1. The MIL will light up when the ignition switch is turned ON
without the engine running. This is a bulb check.
IIf the MIL does not light up, refer to EL-114, ªSchematicº.
(Or refer to EC-648, ªWiring Diagramº.)
2. When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction. For detail, refer to
EC-59, ªIntroductionº.
CONSULT-IINBAT0184After performing ªSELF-DIAGNOSTIC PROCEDURE (WITH CON-
SULT-II)º (AT-37), place check marks for results on the ªDIAGNOS-
TIC WORKSHEETº, AT-55. Reference pages are provided follow-
ing the items.
NOTICE:
1) The CONSULT-II electrically displays shift timing and lock-up
timing (that is, operation timing of each solenoid).
Check for time difference between actual shift timing and the
CONSULT-II display. If the difference is noticeable, mechani-
cal parts (except solenoids, sensors, etc.) may be malfunction-
ing. Check mechanical parts using applicable diagnostic pro-
cedures.
2) Shift schedule (which implies gear position) displayed on
CONSULT-II and that indicated in Service Manual may differ
slightly. This occurs because of the following reasons:
IActual shift schedule has more or less tolerance or allowance,
IShift schedule indicated in Service Manual refers to the point
where shifts start, and
IGear position displayed on CONSULT-II indicates the point
where shifts are completed.
3) Shift solenoid valve ªAº or ªBº is displayed on CONSULT-II at
the start of shifting. Gear position is displayed upon completion
of shifting (which is computed by TCM).
4) Additional CONSULT-II information can be found in the Opera-
tion Manual supplied with the CONSULT-II unit.
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SELF-DIAGNOSTIC PROCEDURE (WITH CONSULT-II)NBAT0184S011. Turn on CONSULT-II and touch ªENGINEº for OBD-II detected
items or touch ªA/Tº for TCM self-diagnosis.
If A/T is not displayed, check TCM power supply and ground
circuit. Refer to AT-92. If result is NG, refer to EL-9, ªSche-
maticº.
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Malfunction Indicator Lamp (MIL)
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2. Touch ªSELF-DIAG RESULTSº.
Display shows malfunction experienced since the last erasing
operation.
CONSULT-II performs REAL-TIME SELF-DIAGNOSIS.
Also, any malfunction detected while in this mode will be dis-
played at real time.
SELF-DIAGNOSTIC RESULT TEST MODENBAT0184S02
Detected items
(Screen terms for CONSULT-II, ªSELF-DIAG
RESULTSº test mode)
Malfunction is detected when ...TCM self-diagnosis OBD-II (DTC)
Available by
O/D OFF
indicator lamp or
ªA/Tº on CONSULT-IIAvailable by
malfunction
indicator lamp*2,
ªENGINEº on CON-
SULT-II or GST ªA/Tº ªENGINEº
PNP switch circuitITCM does not receive the cor-
rect voltage signal (based on
the gear position) from the
switch.Ð P0705
ÐPNP SW/CIRC
Revolution sensorITCM does not receive the
proper voltage signal from the
sensor.X P0720
VHCL SPEED
SEN´A/TVEH SPD SEN/CIR
AT
Vehicle speed sensor (Meter)ITCM does not receive the
proper voltage signal from the
sensor.XÐ
VHCL SPEED
SEN´MTRÐ
A/T 1st gear functionIA/T cannot be shifted to the 1st
gear position even if electrical
circuit is good.Ð P0731*1
ÐA/T 1ST GR FNCTN
A/T 2nd gear functionIA/T cannot be shifted to the 2nd
gear position even if electrical
circuit is good.Ð P0732*1
ÐA/T 2ND GR FNCTN
A/T 3rd gear functionIA/T cannot be shifted to the 3rd
gear position even if electrical
circuit is good.Ð P0733*1
ÐA/T 3RD GR FNCTN
A/T 4th gear functionIA/T cannot be shifted to the 4th
gear position even if electrical
circuit is good.Ð P0734*1
ÐA/T 4TH GR FNCTN
A/T TCC S/V function (lock-up)IA/T cannot perform lock-up
even if electrical circuit is good.Ð P0744*1
Ð A/T TCC S/V FNCTN
Shift solenoid valve AITCM detects an improper volt-
age drop when it tries to operate
the solenoid valve.X P0750
SHIFT SOLENOID/V
ASFT SOL A/CIRC
Shift solenoid valve BITCM detects an improper volt-
age drop when it tries to operate
the solenoid valve.X P0755
SHIFT SOLENOID/V
BSFT SOL B/CIRC
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-38

Detected items
(Screen terms for CONSULT-II, ªSELF-DIAG
RESULTSº test mode)
Malfunction is detected when ...TCM self-diagnosis OBD-II (DTC)
Available by
O/D OFF
indicator lamp or
ªA/Tº on CONSULT-IIAvailable by
malfunction
indicator lamp*2,
ªENGINEº on CON-
SULT-II or GST ªA/Tº ªENGINEº
Overrun clutch solenoid valveITCM detects an improper volt-
age drop when it tries to operate
the solenoid valve.X P1760
OVERRUN CLUTCH
S/VO/R CLUCH SOL/
CIRC
T/C clutch solenoid valveITCM detects an improper volt-
age drop when it tries to operate
the solenoid valve.X P0740
T/C CLUTCH SOL/V TCC SOLENOID/
CIRC
Line pressure solenoid valveITCM detects an improper volt-
age drop when it tries to operate
the solenoid valve.X P0745
LINE PRESSURE
S/VL/PRESS SOL/CIRC
Throttle position sensor
Throttle position switchITCM receives an excessively
low or high voltage from the
sensor.X P1705
THROTTLE POSI
SENTP SEN/CIRC A/T
Engine speed signalITCM does not receive the
proper voltage signal from the
ECM.X P0725
ENGINE SPEED SIG
A/T fluid temperature sensorITCM receives an excessively
low or high voltage from the
sensor.X P0710
BATT/FLUID TEMP
SENATF TEMP SEN/
CIRC
Engine controlIThe ECM-AT communication
line is open or shorted.X EC-440, EC-603
A/T COMM LINE Ð
Turbine revolution sensorITCM does not receive the
proper voltage signal from the
sensor.XÐ
TURBINE REV
Ð
TCM (RAM)ITCM memory (RAM) is malfunc-
tioning.
ÐÐ
CONTROL UNIT
(RAM)Ð
TCM (ROM)ITCM memory (ROM) is malfunc-
tioning.
ÐÐ
CONTROL UNIT
(ROM)Ð
TCM (EEP ROM)ITCM memory (EEP ROM) is
malfunctioning.
ÐÐ
CONTROL UNIT
(EEP ROM)Ð
Initial startIThis is not a malfunction mes-
sage (Whenever shutting off a
power supply to the TCM, this
message appears on the
screen.)XÐ
INITIAL START
Ð
No failure
(NO DTC IS DETECTED FURTHER TEST-
ING MAY BE REQUIRED)INo failure has been detected.
XX
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-39

X: Applicable
Ð: Not applicable
*1: These malfunctions cannot be displayed by MIL
if another malfunction is assigned to MIL.
*2: Refer to EC-74, ªDESCRIPTIONº.
DATA MONITOR MODE (A/T)NBAT0184S03
Item DisplayMonitor item
Description Remarks
TCM input
signalsMain sig-
nals
Vehicle speed sensor 1
(A/T)
(Revolution sensor)VHCL/S SE´A/T
[km/h] or [mph]
XÐIVehicle speed computed
from signal of revolution
sensor is displayed.When racing engine in ªNº
or ªPº position with vehicle
stationary, CONSULT-II
data may not indicate 0
km/h (0 mph).
Vehicle speed sensor 2
(Meter)VHCL/S SE´MTR
[km/h] or [mph]
XÐIVehicle speed computed
from signal of vehicle
speed sensor is dis-
played.Vehicle speed display may
not be accurate under
approx. 10 km/h (6 mph). It
may not indicate 0 km/h (0
mph) when vehicle is sta-
tionary.
Throttle position sensor THRTL POS
SEN
[V]XÐIThrottle position sensor
signal voltage is dis-
played.
A/T fluid temperature sen-
sorFLUID TEMP SE
[V]
XÐIA/T fluid temperature
sensor signal voltage is
displayed.
ISignal voltage lowers as
fluid temperature rises.
Battery voltage BATTERY VOLT
[V]XÐISource voltage of TCM
is displayed.
Engine speed ENGINE SPEED
[rpm]
XXIEngine speed, computed
from engine speed
signal, is displayed.Engine speed display may
not be accurate under
approx. 800 rpm. It may
not indicate 0 rpm even
when engine is not run-
ning.
Turbine revolution sensor TURBINE REV
[rpm]
XÐITurbine revolution com-
puted from signal of tur-
bine revolution sensor is
displayed.Error may occur under
approx. 800 rpm and will
not indicate 0 rpm even if
engine is not running.
Overdrive control switch OVERDRIVE SW
[ON/OFF] X ÐION/OFF state computed
from signal of overdrive
control SW is displayed.
PN position switch PN POSI SW
[ON/OFF] X ÐION/OFF state computed
from signal of PN posi-
tion SW is displayed.
R position switch R POSITION SW
[ON/OFF] X ÐION/OFF state computed
from signal of R position
SW is displayed.
D position switch D POSITION SW
[ON/OFF] X ÐION/OFF state computed
from signal of D position
SW is displayed.
2 position switch 2 POSITION SW
[ON/OFF]
XÐION/OFF status, com-
puted from signal of 2
position SW, is dis-
played.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-40

Item DisplayMonitor item
Description Remarks
TCM input
signalsMain sig-
nals
1 position switch 1 POSITION SW
[ON/OFF]
XÐION/OFF status, com-
puted from signal of 1
position SW, is dis-
played.
ASCD cruise signal ASCD-CRUISE
[ON/OFF]
XÐIStatus of ASCD cruise
signal is displayed.
ON ... Cruising state
OFF ... Normal running
stateIThis is displayed even
when no ASCD is
mounted.
ASCD OD cut signal ASCD-OD CUT
[ON/OFF]
XÐIStatus of ASCD OD
release signal is dis-
played.
ON ... OD released
OFF ... OD not releasedIThis is displayed even
when no ASCD is
mounted.
Kickdown switch KICKDOWN SW
[ON/OFF]
XÐION/OFF status, com-
puted from signal of
kickdown SW, is dis-
played.IThis is displayed even
when no kickdown
switch is equipped.
Closed throttle position
switchCLOSED
THL/SW
[ON/OFF]XÐION/OFF status, com-
puted from signal of
closed throttle position
SW, is displayed.
Wide open throttle position
switchW/O THRL/P-SW
[ON/OFF]
XÐION/OFF status, com-
puted from signal of
wide open throttle posi-
tion SW, is displayed.
Stop lamp switch BRAKE SW
[ON/OFF]
XÐION/OFF status is dis-
played.
ON ... Brake pedal is
depressed.
OFF ... Brake pedal is
released.
Gear position GEAR
ÐXIGear position data used
for computation by TCM,
is displayed.
Selector lever position SLCT LVR POSI
ÐXISelector lever position
data, used for computa-
tion by TCM, is dis-
played.IA specific value used for
control is displayed if
fail-safe is activated due
to error.
Vehicle speed VEHICLE
SPEED
[km/h] or [mph]ÐXIVehicle speed data,
used for computation by
TCM, is displayed.
Throttle position THROTTLE
POSI
[/8]ÐXIThrottle position data,
used for computation by
TCM, is displayed.IA specific value used for
control is displayed if
fail-safe is activated due
to error.
Line pressure duty LINE PRES DTY
[%]
ÐXIControl value of line
pressure solenoid valve,
computed by TCM from
each input signal, is dis-
played.GI
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-41

Item DisplayMonitor item
Description Remarks
TCM input
signalsMain sig-
nals
Torque converter clutch
solenoid valve dutyTCC S/V DUTY
[%]
ÐXIControl value of torque
converter clutch solenoid
valve, computed by
TCM from each input
signal, is displayed.
Shift solenoid valve A SHIFT S/V A
[ON/OFF]
ÐXIControl value of shift
solenoid valve A, com-
puted by TCM from
each input signal, is dis-
played.Control value of solenoid is
displayed even if solenoid
circuit is disconnected.
The ªOFFº signal is dis-
played if solenoid circuit is
shorted.
Shift solenoid valve B SHIFT S/V B
[ON/OFF]
ÐXIControl value of shift
solenoid valve B, com-
puted by TCM from
each input signal, is dis-
played.
Overrun clutch solenoid
valveOVERRUN/C S/V
[ON/OFF]
ÐXIControl value of overrun
clutch solenoid valve
computed by TCM from
each input signal is dis-
played.
Self-diagnosis display lamp
(O/D OFF indicator lamp)SELF-D DP LMP
[ON/OFF] Ð XIControl status of O/D
OFF indicator lamp is
displayed.
X: Applicable
Ð: Not applicable
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DTC WORK SUPPORT MODE WITH CONSULT-IINBAT0184S04CONSULT-II Setting ProcedureNBAT0184S04011. Turn ignition switch ªOFFº.
2. Connect CONSULT-II to data link connector, which is located
in instrument lower panel on driver side.
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3. Turn ignition switch ªONº.
4. Touch ªSTARTº.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-42

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5. Touch ªA/Tº.
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6. Touch ªDTC WORK SUPPORTº.
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7. Touch select item menu (1ST, 2ND, etc.).
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8. Touch ªSTARTº.
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9. Perform driving test according to ªDTC CONFIRMATION PRO-
CEDUREº in ªTROUBLE DIAGNOSIS FOR DTCº.
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-43

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IWhen testing conditions are satisfied, CONSULT-II screen
changes from ªOUT OF CONDITIONº to ªTESTINGº.
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10. Stop vehicle. If ªNGº appears on the screen, malfunction may
exist. Go to ªDIAGNOSTIC PROCEDUREº.
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11. Perform test drive to check gear shift feeling in accordance
with instructions displayed.
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12. Touch ªYESº or ªNOº.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-44

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13. CONSULT-II procedure ended.
If ªNGº appears on the screen, a malfunction may exist. Go to
ªDIAGNOSTIC PROCEDUREº.
DTC WORK SUPPORT MODENBAT0184S05
DTC work support item Description Check item
1ST GR FNCTN P0731Following items for ªA/T 1st gear function (P0731)º can be con-
firmed.
ISelf-diagnosis status (whether the diagnosis is being con-
ducted or not)
ISelf-diagnosis result (OK or NG)IShift solenoid valve A
IShift solenoid valve B
IEach clutch
IHydraulic control circuit
2ND GR FNCTN P0732Following items for ªA/T 2nd gear function (P0732)º can be con-
firmed.
ISelf-diagnosis status (whether the diagnosis is being con-
ducted or not)
ISelf-diagnosis result (OK or NG)IShift solenoid valve B
IEach clutch
IHydraulic control circuit
3RD GR FNCTN P0733Following items for ªA/T 3rd gear function (P0733)º can be con-
firmed.
ISelf-diagnosis status (whether the diagnosis is being con-
ducted or not)
ISelf-diagnosis result (OK or NG)IShift solenoid valve A
IEach clutch
IHydraulic control circuit
4TH GR FNCTN P0734Following items for ªA/T 4th gear function (P0734)º can be con-
firmed.
ISelf-diagnosis status (whether the diagnosis is being con-
ducted or not)
ISelf-diagnosis result (OK or NG)IShift solenoid valve A
IShift solenoid valve B
IOverrun clutch solenoid valve
ILine pressure solenoid valve
IEach clutch
IHydraulic control circuit
TCC S/V FNCTN P0744Following items for ªA/T TCC S/V function (lock-up) (P0744)º can
be confirmed.
ISelf-diagnosis status (whether the diagnosis is being con-
ducted or not)
ISelf-diagnosis result (OK or NG)ITorque converter clutch sole-
noid valve
IEach clutch
IHydraulic control circuit
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-45