clutch INFINITI QX4 2001 Factory Owner's Manual

SAT015J
Overrun Clutch Solenoid Valve ControlNBAT0180S0402The overrun clutch solenoid valve is operated by an ON-OFF sig-
nal transmitted by the TCM to provide overrun clutch control
(engine brake control).
When this solenoid valve is ªONº, the pilot pressure drain port
closes. When it is ªOFFº, the drain port opens.
During the solenoid valve ªONº pilot pressure is applied to the end
face of the overrun clutch control valve.
SAT049J
Overrun Clutch Control Valve OperationNBAT0180S0403When the solenoid valve is ªONº, pilot pressure A is applied to the
overrun clutch control valve. This pushes up the overrun clutch
control valve. The line pressure is then shut off so that the clutch
does not engage.
When the solenoid valve is ªOFFº, pilot pressure A is not gener-
ated. At this point, the overrun clutch control valve moves down-
ward by spring force. As a result, overrun clutch operation pressure
is provided by the overrun clutch reducing valve. This causes the
overrun clutch to engage.
In the ª1º position, the overrun clutch control valve remains pushed
down so that the overrun clutch is engaged at all times.
Control ValveNBAT0181FUNCTION OF CONTROL VALVENBAT0181S01
Valve name Function
IPressure regulator valve
IPressure regulator plug
IPressure regulator sleeve plugRegulate oil discharged from the oil pump to provide optimum line pressure for all
driving conditions.
Pressure modifier valve Used as a signal supplementary valve to the pressure regulator valve. Regulates
pressure-modifier pressure (signal pressure) which controls optimum line pressure for
all driving conditions.
Modifier accumulator piston Smooths hydraulic pressure regulated by the pressure modifier valve to prevent pul-
sations.
Pilot valve Regulates line pressure to maintain a constant pilot pressure level which controls
lock-up mechanism, overrun clutch, 3-2 timing required for shifting.
Accumulator control valve
Accumulator control sleeveRegulate accumulator back-pressure to pressure suited to driving conditions.
Manual valve Directs line pressure to oil circuits corresponding to select positions.
Hydraulic pressure drains when the shift lever is in Neutral.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OVERALL SYSTEM
Control Mechanism (Cont'd)
AT-31

Valve name Function
Shift valve A Simultaneously switches three oil circuits using output pressure of shift solenoid valve
A to meet driving conditions (vehicle speed, throttle opening, etc.).
Provides automatic downshifting and up-shifting (1st,2nd,3rd,4th gears/4th
,3rd,2nd,1st gears) in combination with shift valve B.
Shift valve B Simultaneously switches three oil circuits using output pressure of shift solenoid valve
B in relation to driving conditions (vehicle speed, throttle opening, etc.).
Provides automatic downshifting and up-shifting (1st,2nd,3rd,4th gears/4th
,3rd,2nd,1st gears) in combination with shift valve A.
Shuttle shift valve S Switches hydraulic circuits to provide 3-2 timing control and overrun clutch control in
relation to the throttle opening.
Inactivates the overrun clutch to prevent interlocking in 4th gear when the throttle is
wide open.
Overrun clutch control valve Switches hydraulic circuits to prevent engagement of the overrun clutch simulta-
neously with application of the brake band in 4th gear. (Interlocking occurs if the
overrun clutch engages during D
4gear operation.)
4-2 relay valve Memorizes that the transmission is in 4th gear. Prevents the transmission from down-
shifting from 4th gear to 3rd and then to 2nd in combination with 4-2 sequence valve
and shift valves A and B when downshifting from 4th to 2nd gear.
4-2 sequence valve Prevents band servo pressure from draining before high clutch operating pressure
and band servo releasing pressure drain (from the same circuit) during downshifting
from 4th to 2nd gear.
Servo charger valve An accumulator and a one-way orifice are used in the 2nd gear band servo oil circuit
to dampen shifting shock when shifting from 1st to 2nd gear.
To maintain adequate flow rate when downshifting from 4th or 3rd gear to 2nd gear,
the servo charger valve directs 2nd gear band servo hydraulic pressure to the circuit
without going through the one-way orifice when downshifting from 3rd or a higher
gear.
3-2 timing valve Prevents a late operation of the brake band when shifting selector lever from ªDº to
ª1º or ª2º position while driving in D
3.
ª1º reducing valve Reduces low & reverse brake pressure to dampen engine-brake shock when down-
shifting from the ª1º position 2nd gear to 1st gear.
Overrun clutch reducing valve Reduces oil pressure directed to the overrun clutch and prevents engine-brake shock.
In ª1º and ª2º positions, line pressure acts on the overrun clutch reducing valve to
increase the pressure-regulating point, with resultant engine brake capability.
Torque converter relief valve Prevents an excessive rise in torque converter pressure.
Torque converter clutch control valve,
torque converter clutch control plug and
torque converter clutch control sleeveActivate or inactivate the lock-up function.
Also provide smooth lock-up through transient application and release of the lock-up
system.
Shuttle shift valve D Switches hydraulic circuits so that output pressure of the torque converter clutch sole-
noid valve acts on the lock-up valve in the ªDº position of 2nd, 3rd and 4th gears. (In
the ªDº position 1st gear, lock-up is inhibited.)
ILock-up control is not affected in ªDº position 2nd, 3rd or 4th gears, unless output
pressure of the torque converter clutch solenoid valve is generated by a signal
from the control unit.
OVERALL SYSTEM
Control Valve (Cont'd)
AT-32

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
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-39

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
SAT131K
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.
SAT586J
3. Turn ignition switch ªONº.
4. Touch ªSTARTº.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-42

SAT596J
SAT593J
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
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont'd)
AT-45

O/D OFF indicator lamp:
6th judgement flicker is longer than others.
SAT672I
Overrun clutch solenoid valve circuit is short-circuited or discon-
nected.
ÞGo to DTC P1760 OVERRUN CLUTCH SOLENOID VALVE,
AT-185.7th judgement flicker is longer than others.
SAT673I
Torque converter clutch solenoid valve circuit is short-circuited
or disconnected.
ÞGo to DTC P0740 TORQUE CONVERTER CLUTCH SOLE-
NOID VALVE, AT-148.
8th judgement flicker is longer than others.
SAT674I
A/T fluid temperature sensor is disconnected or TCM power
source circuit is damaged.
ÞGo to DTC BATT/FLUID TEMP SEN (A/T FLUID TEM-
PERATURE SENSOR AND TCM POWER SOURCE), AT-190.9th judgement flicker is longer than others.
SAT675I
Engine speed signal circuit is short-circuited or disconnected.
ÞGo to DTC P0725 ENGINE SPEED SIGNAL, AT-116.
10th judgement flicker is longer than others.
SAT676I
Turbine revolution sensor circuit is short-circuited or discon-
nected.
ÞGo to DTC Turbine Revolution Sensor, AT-202.11th judgement flicker is longer than others.
SAT677I
Line pressure solenoid valve circuit is short-circuited or discon-
nected.
ÞGo to DTC P0745 LINE PRESSURE SOLENOID VALVE,
AT-162.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Diagnostic Procedure Without CONSULT-II (Cont'd)
AT-51

Diagnostic Worksheet=NBAT0019S0102
1.lRead the Fail-safe Remarks and listen to customer complaints. AT-8
2.lCHECK A/T FLUIDAT-59
lLeakage (Follow specified procedure)
lFluid condition
lFluid level
3. Perform STALL TEST and LINE PRESSURE TEST. AT-59, AT-62
lStall test Ð Mark possible damaged components/others.
lTorque converter one-way clutch
lReverse clutch
lForward clutch
lOverrun clutch
lForward one-way clutchlLow & reverse brake
lLow one-way clutch
lEngine
lLine pressure is low
lClutches and brakes except high clutch and
brake band are OK
lPressure test Ð Suspected parts:
4.lPerform all ROAD TEST and mark required procedures. AT-63
4-1. Check before engine is started.AT-64
lSELF-DIAGNOSTIC PROCEDURE - Mark detected items.
lDTC P0705 PNP switch, AT-99.
lDTC P0710 A/T fluid temperature sensor, AT-105.
lDTC P0720 Vehicle speed sensor´A/T (Revolution sensor), AT-111.
lDTC P0725 Engine speed signal, AT-116.
lDTC P0740 Torque converter clutch solenoid valve, AT-148.
lDTC P0745 Line pressure solenoid valve, AT-162.
lDTC P0750 Shift solenoid valve A, AT-168.
lDTC P0755 Shift solenoid valve B, AT-172.
lDTC P1705 Throttle position sensor, AT-176.
lDTC P1760 Overrun clutch solenoid valve, AT-185.
lDTC BATT/FLUID TEMP SEN (A/T fluid temperature sensor and TCM power source), AT-190.
lDTC Vehicle speed sensor´MTR, AT-197.
lDTC Turbine revolution sensor, AT-202.
lDTC A/T communication line, AT-207.
lDTC Control unit (RAM), control unit (ROM), AT-211.
lDTC Control unit (EEP ROM), AT-213.
lPNP, overdrive control and throttle position switches, AT-257.
lBattery
lOthers
4-2. Check at idleAT-66
l1. O/D OFF Indicator Lamp Does Not Come On, AT-218.
l2. Engine Cannot Be Started In ªPº And ªNº Position, AT-221.
l3. In ªPº Position, Vehicle Moves Forward Or Backward When Pushed, AT-222.
l4. In ªNº Position, Vehicle Moves, AT-223.
l5. Large Shock. ªNº,ªRº Position, AT-225.
l6. Vehicle Does Not Creep Backward In ªRº Position, AT-227.
l7. Vehicle Does Not Creep Forward In ªDº, ª2º Or ª1º Position, AT-230.GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð INTRODUCTION
Introduction (Cont'd)
AT-55

4. 4-3. Cruise testAT-67
AT-71
Part-1
l8. Vehicle Cannot Be Started From D
1, AT-233.
l9. A/T Does Not Shift: D
1,D2Or Does Not Kickdown: D4,D2, AT-236.
l10. A/T Does Not Shift: D
2,D3, AT-239.
l11. A/T Does Not Shift: D
3,D4, AT-242.
l12. A/T Does Not Perform Lock-up, AT-245.
l13. A/T Does Not Hold Lock-up Condition, AT-247.
l14. Lock-up Is Not Released, AT-249.
l15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3), AT-250.
Part-2AT-75
l16. Vehicle Does Not Start From D
1, AT-252.
l9. A/T Does Not Shift: D
1,D2Or Does Not Kickdown: D4,D2, AT-236.
l10. A/T Does Not Shift: D
2,D3, AT-239.
l11. A/T Does Not Shift: D
3,D4, AT-242.
Part-3AT-77
l17. A/T Does Not Shift: D
4,D3When Overdrive Control Switch ªONº,ªOFFº, AT-253
l15. Engine Speed Does Not Return To Idle (Engine Brake In D
3), AT-250.
l18. A/T Does Not Shift: D
3,22, When Selector Lever ªDº,ª2º Position, AT-254.
l15. Engine Speed Does Not Return To Idle (Engine Brake In 2
2), AT-250.
l19. A/T Does Not Shift: 2
2,11, When Selector Lever ª2º,ª1º Position, AT-255.
l20. Vehicle Does Not Decelerate By Engine Brake, AT-256.
lSELF-DIAGNOSTIC PROCEDURE Ð Mark detected items.
lDTC P0705 PNP switch, AT-99.
lDTC P0710 A/T fluid temperature sensor, AT-105.
lDTC P0720 Vehicle speed sensor´A/T (Revolution sensor), AT-111.
lDTC P0725 Engine speed signal, AT-116.
lDTC P0740 Torque converter clutch solenoid valve, AT-148.
lDTC P0745 Line pressure solenoid valve, AT-162.
lDTC P0750 Shift solenoid valve A, AT-168.
lDTC P0755 Shift solenoid valve B, AT-172.
lDTC P1705 Throttle position sensor, AT-176.
lDTC P1760 Overrun clutch solenoid valve, AT-185.
lDTC BATT/FLUID TEMP SEN (A/T fluid temperature sensor and TCM power source), AT-190.
lDTC Vehicle speed sensor´MTR, AT-197.
lDTC Turbine revolution sensor, AT-202.
lDTC A/T communication line, AT-207.
lDTC Control unit (RAM), control unit (ROM), AT-211.
lDTC Control unit (EEP ROM), AT-213.
lPNP, overdrive control and throttle position switches, AT-257.
lBattery
lOthers
5.lFor self-diagnosis NG items, inspect each component. Repair or replace the damaged parts. AT-38
6.lPerform all ROAD TEST and re-mark required procedures. AT-63
7.lPerform DTC CONFIRMATION PROCEDURE for following MIL indicating items and check out NG items.
Refer to EC-60, ªEmission-related Diagnostic Informationº.EC-60
lDTC (P0731, 1103) A/T 1st gear function, AT-120.
lDTC (P0732, 1104) A/T 2nd gear function, AT-126.
lDTC (P0733, 1105) A/T 3rd gear function, AT-132.
lDTC (P0734, 1106) A/T 4th gear function, AT-138.
lDTC (P0744, 1107) A/T TCC S/V function (lock-up), AT-153.
8.lPerform the Diagnostic Procedures for all remaining items marked NG. Repair or replace the damaged
parts.
Refer to the Symptom Chart when you perform the procedures. (The chart also shows some other possible
symptoms and the component inspection orders.)AT-92
AT-97
9.lErase DTC from TCM and ECM memories. AT-35
TROUBLE DIAGNOSIS Ð INTRODUCTION
Introduction (Cont'd)
AT-56

SAT514G
5. Start engine, apply foot brake, and place selector lever in ªDº
position.
6. Accelerate to wide open throttle gradually while applying foot
brake.
7. Quickly note the engine stall revolution and immediately
release throttle.
IDuring test, never hold throttle wide open for more than 5
seconds.
Stall revolution:
Refer to SDS, AT-356.
SAT771B
8. Move selector lever to ªNº position.
9. Cool off ATF.
IRun engine at idle for at least one minute.
10. Repeat steps 5 through 9 with selector lever in ª2º, ª1º and ªRº
positions.
JUDGEMENT OF STALL TESTNBAT0022S02The test result and possible damaged components relating to each
result are shown in the illustration. In order to pinpoint the possible
damaged components, refer to ªWork Flowº, AT-57.
NOTE:
Stall revolution is too high in ªDº or ª2º position:
ISlippage occurs in 1st gear but not in 2nd and 3rd gears. .....
Low one-way clutch slippage
ISlippage occurs at the following gears:
1st through 3rd gears in ªDº position and engine brake func-
tions.
1st and 2nd gears in ª2º position and engine brake functions
with accelerator pedal released (fully closed throttle). ..... For-
ward clutch or forward one-way clutch slippage
Stall revolution is too high in ªRº position:
IEngine brake does not function in ª1º position. ..... Low &
reverse brake slippage
IEngine brake functions in ª1º position. ..... Reverse clutch slip-
page
Stall revolution within specifications:
IVehicle does not achieve speed of more than 80 km/h (50
MPH). ..... One-way clutch seizure in torque converter housing
CAUTION:
Be careful since automatic fluid temperature increases abnor-
mally.
ISlippage occurs in 3rd and 4th gears in ªDº position. ..... High
clutch slippage
ISlippage occurs in 2nd and 4th gear in ªDº position. ..... Brake
band slippage
Stall revolution less than specifications:
IPoor acceleration during starts. ..... One-way clutch seizure in
torque converter
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Stall Test (Cont'd)
AT-60

SAT493G
5. Start engine and measure line pressure at idle and stall speed.
IWhen measuring line pressure at stall speed, follow the
stall test procedure.
Line pressure:
Refer to SDS, AT-356.
JUDGEMENT OF LINE PRESSURE TESTNBAT0023S02
Judgement Suspected parts
At idleLine pressure is low in all posi-
tions.IOil pump wear
IControl piston damage
IPressure regulator valve or plug sticking
ISpring for pressure regulator valve damaged
IFluid pressure leakage between oil strainer and pressure regulator valve
IClogged strainer
Line pressure is low in particu-
lar position.IFluid pressure leakage between manual valve and particular clutch
IFor example, line pressure is:
Ð Low in ªRº and ª1º positions, but
Ð Normal in ªDº and ª2º positions.
Then, fluid leakage exists at or around low and reverse brake circuit.
Refer to ªCLUTCH AND BAND CHARTº, AT-17.
Line pressure is high.IMal-adjustment of throttle position sensor
IFluid temperature sensor damaged
ILine pressure solenoid valve sticking
IShort circuit of line pressure solenoid valve circuit
IPressure modifier valve sticking
IPressure regulator valve or plug sticking
IOpen in dropping resistor circuit
At stall speedLine pressure is low.IMal-adjustment of throttle position sensor
ILine pressure solenoid valve sticking
IShort circuit of line pressure solenoid valve circuit
IPressure regulator valve or plug sticking
IPressure modifier valve sticking
IPilot valve sticking
SAT786A
Road TestNBAT0024DESCRIPTIONNBAT0024S01IThe purpose of the test is to determine overall performance of
A/T and analyze causes of problems.
IThe road test consists of the following three parts:
1. Check before engine is started
2. Check at idle
3. Cruise test
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS Ð BASIC INSPECTION
Line Pressure Test (Cont'd)
AT-63