2001 INFINITI QX4 clutch

13. A/T Does Not Hold Lock-up Condition=NBAT0085SYMPTOM:
A/T does not hold lock-up condition for more than 30 seconds.
1 CHECK DIAGNOSTIC RESULTS
Does self-diagnosis show damage to engine speed signal circuit after cruise test?
SAT582I
YesorNo
Ye s©Check engine speed signal circuit. Refer to ªDTC P0725º, AT-116.
No©GO TO 2.
2 CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK©GO TO 3.
NG©GO TO 5.
3 DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-273.
2. Check the following items:
ITorque converter clutch control valve
IPilot valve
IPilot filter
OK or NG
OK©GO TO 4.
NG©Repair or replace damaged parts.
GI
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LC
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PD
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TROUBLE DIAGNOSES FOR SYMPTOMS
13. A/T Does Not Hold Lock-up Condition
AT-247

4 CHECK SYMPTOM
Check again.
OK or NG
OK©INSPECTION END
NG©1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
5 DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-273.
2. Check the following items:
ITorque converter clutch control valve
IPilot valve
IPilot filter
3. Disassemble A/T.
4. Check torque converter and oil pump assembly.
OK or NG
OK©GO TO 4.
NG©Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
13. A/T Does Not Hold Lock-up Condition (Cont'd)
AT-248

15. Engine Speed Does Not Return To Idle
(Light Braking D
4®D3)=NBAT0087SYMPTOM:
IEngine speed does not smoothly return to idle when A/T
shifts from D
4to D3.
IVehicle does not decelerate by engine brake when turning
overdrive control switch OFF.
IVehicle does not decelerate by engine brake when shifting
A/T from ªDº to ª2º position.
1 CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to overrun clutch solenoid valve circuit after cruise test?
SAT583I
YesorNo
Ye s©Check overrun clutch solenoid valve circuit. Refer to ªDTC P1760º, AT-185.
No©GO TO 2.
2 CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to EC-174, ªDescriptionº.
SAT142K
OK or NG
OK©GO TO 3.
NG©Repair or replace throttle position sensor.
TROUBLE DIAGNOSES FOR SYMPTOMS
15. Engine Speed Does Not Return To Idle (Light Braking D4®D3)
AT-250

3 CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK©GO TO 4.
NG©GO TO 6.
4 DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-273.
2. Check the following items:
IOverrun clutch control valve
IOverrun clutch reducing valve
IOverrun clutch solenoid valve
OK or NG
OK©GO TO 5.
NG©Repair or replace damaged parts.
5 CHECK SYMPTOM
Check again.
OK or NG
OK©INSPECTION END
NG©1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
6 DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-273.
2. Check the following items:
IOverrun clutch control valve
IOverrun clutch reducing valve
IOverrun clutch solenoid valve
3. Disassemble A/T.
4. Check the following items:
IOverrun clutch assembly
IOil pump assembly
OK or NG
OK©GO TO 5.
NG©Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
15. Engine Speed Does Not Return To Idle (Light Braking D4®D3) (Cont'd)
AT-251

NBAT0111
SAT018B
1. Drain ATF through drain plug.
2. Remove turbine revolution sensor.
3. Remove torque converter by holding it firmly and turning while
pulling straight out.
SAT521G
4. Check torque converter one-way clutch.
a. Insert Tool into spline of one-way clutch inner race.
b. Hook bearing support unitized with one-way clutch outer race
with suitable wire.
c. Check that one-way clutch inner race rotates only clockwise
with Tool while holding bearing support with wire.
SAT021BB
5. Remove PNP switch from transmission case.
SAT754I
6. Remove oil pan.
IAlways place oil pan straight down so that foreign particles
inside will not move.
SAT522G
7. Place transmission into Tool with the control valve facing up.
DISASSEMBLY
AT-286

SAT171B
8. Check foreign materials in oil pan to help determine cause of
malfunction. If the fluid is very dark, smells burned, or contains
foreign particles, the frictional material (clutches, band) may
need replacement. A tacky film that will not wipe clean indi-
cates varnish build up. Varnish can cause valves, servo, and
clutches to stick and may inhibit pump pressure.
IIf frictional material is detected, replace radiator after
repair of A/T. Refer to LC-19, ªREMOVAL AND INSTALLA-
TIONº.
SAT024BC
9. Remove torque converter clutch solenoid valve and A/T fluid
temperature sensor connectors.
IBe careful not to damage connector.
SAT008B
10. Remove oil strainer.
a. Remove oil strainer from control valve assembly.
Then remove O-ring from oil strainer.
SAT025B
b. Check oil strainer screen for damage.
SAT009B
11. Remove control valve assembly.
a. Straighten terminal clips to free terminal cords then remove
terminal clips.
GI
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DISASSEMBLY
AT-287

SAT988A
16. Remove input shaft and oil pump gasket.
SAT029B
17. Remove brake band and band strut.
a. Loosen lock nut and remove band servo anchor end pin from
transmission case.
SAT986A
b. Remove brake band and band strut from transmission case.
SAT655
c. Hold brake band in a circular shape with clip.
SAT030B
18. Remove front side clutch and gear components.
a. Remove clutch pack (reverse clutch, high clutch and front sun
gear) from transmission case.
DISASSEMBLY
AT-290

SAT113B
b. Remove front bearing race from clutch pack.
c. Remove rear bearing race from clutch pack.
SAT031B
d. Remove front planetary carrier from transmission case.
SAT968A
e. Remove front needle bearing from front planetary carrier.
f. Remove rear bearing from front planetary carrier.
SAT974A
g. Remove rear sun gear from transmission case.
SAT546J
19. Remove rear extension assembly (2WD model only).
a. Remove rear extension assembly.
b. Remove parking gear and needle bearing.
CAUTION:
Insert your hand between rear extension and transmission
case. Detach rear extension assembly while holding parking
gear and needle bearing by hand.
c. Remove rear extension gasket.
GI
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LC
EC
FE
TF
PD
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DISASSEMBLY
AT-291