2001 INFINITI QX4 air filter

7 DETECT MALFUNCTIONING ITEM
1. Remove control valve Assembly. Refer to AT-273.
2. Check the following items:
IShift valve B
IShift solenoid valve B
IPilot valve
IPilot filter
3. Disassemble A/T.
4. Check the following items:
IServo piston assembly
IHigh clutch assembly
IOil pump assembly
OK or NG
OK©GO TO 6.
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
10. A/T Does Not Shift: D2®D3(Cont'd)
AT-241

3 CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to EC-174, ªDescriptionº.
SAT142K
OK or NG
OK©GO TO 4.
NG©Repair or replace throttle position sensor.
4 CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK©GO TO 5.
NG©GO TO 7.
5 DETECT MALFUNCTIONING ITEM
1. Remove control valve Assembly. Refer to AT-273.
2. Check the following items:
IShift valve B
IOverrun clutch control valve
IShift solenoid valve B
IPilot valve
IPilot filter
OK or NG
OK©GO TO 6.
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
11. A/T Does Not Shift: D3®D4(Cont'd)
AT-243

6 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.
7 DETECT MALFUNCTIONING ITEM
1. Remove control valve Assembly. Refer to AT-273.
2. Check the following items:
IShift valve B
IOverrun clutch control valve
IShift solenoid valve B
IPilot valve
IPilot filter
3. Disassemble A/T.
4. Check the following items:
IServo piston assembly
IBrake band
ITorque converter
IOil pump assembly
OK or NG
OK©GO TO 6.
NG©Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
11. A/T Does Not Shift: D3®D4(Cont'd)
AT-244

12. A/T Does Not Perform Lock-up=NBAT0084SYMPTOM:
A/T does not perform lock-up at the specified speed.
1 CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to torque converter clutch solenoid valve circuit after cruise test?
SAT581I
YesorNo
Ye s©Check torque converter clutch solenoid valve circuit. Refer to ªDTC P0740º, AT-148.
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.
3 DETECT MALFUNCTIONING ITEM
1. Remove control valve. Refer to AT-273.
2. Check following items:
ITorque converter clutch control valve
ITorque converter relief valve
ITorque converter clutch solenoid valve
IPilot valve
IPilot filter
OK or NG
OK©GO TO 4.
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
12. A/T Does Not Perform Lock-up
AT-245

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
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
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

SAT194B
DISASSEMBLYNBAT01171. Remove solenoids.
a. Remove torque converter clutch solenoid valve and side plate
from lower body.
b. Remove O-ring from solenoid.
SAT667A
c. Remove line pressure solenoid valve from upper body.
d. Remove O-ring from solenoid.
SAT043G
e. Remove 3-unit solenoid assembly from upper body.
f. Remove O-rings from solenoids.
SAT195B
2. Disassemble upper and lower bodies.
a. Place upper body facedown, and remove bolts, reamer bolts
and support plates.
b. Remove lower body, separator plate as a unit from upper body.
IBe careful not to drop pilot filter, orifice check valve,
spring and steel balls.
SAT670A
c. Place lower body facedown, and remove separator plate.
d. Remove pilot filter, orifice check valve and orifice check spring.
REPAIR FOR COMPONENT PARTS
Control Valve Assembly (Cont'd)
AT-302

SAT676A
Pilot FilterNBAT0118S03ICheck to make sure that filter is not clogged or damaged.
SAT149G
Torque Converter Clutch Solenoid ValveNBAT0118S04ICheck that filter is not clogged or damaged.
IMeasure resistance. Refer to ªComponent Inspectionº, AT-152.
Line Pressure Solenoid ValveNBAT0118S05ICheck that filter is not clogged or damaged.
IMeasure resistance. Refer to ªComponent Inspectionº, AT-167.
SAT095B
3-Unit Solenoid Assembly (Overrun Clutch Solenoid
Valve and Shift Solenoid Valves A and B)
NBAT0118S06IMeasure resistance of each solenoid. Refer to ªComponent
Inspectionº, AT-171, AT-175 and AT-189.
SAT096BA
A/T Fluid Temperature Sensor and SwitchNBAT0118S07IMeasure resistance. Refer to ªComponent Inspectionº, AT-110
and AT-264.
SAT671A
ASSEMBLYNBAT01191. Install upper and lower bodies.
a. Place oil circuit of upper body face up. Install steel balls in their
proper positions.
REPAIR FOR COMPONENT PARTS
Control Valve Assembly (Cont'd)
AT-304