Nissan Frontier D22. Instruction — part 83
DTC P0744 IMPROPER LOCK-UP OPERATION
AT-301
[RE4R01A]
D
E
F
G
H
I
J
K
L
M
A
B
AT
Wiring Diagram — AT — TCCSIG
ECS007N4
WCWA0100E
AT-302
[RE4R01A]
DTC P0744 IMPROPER LOCK-UP OPERATION
Diagnostic Procedure
ECS007N5
1.
CHECK SHIFT UP (D
3
TO D
4
)
During
AT-223, "Cruise Test — Part 1"
, does A/T shift from D
3
to D
4
at the specified speed?
Yes or No
Yes
>> Check for proper lock-up. GO TO 10.
No
>> GO TO 2.
2.
CHECK LINE PRESSURE
Perform line pressure test. Refer to
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 6.
3.
CHECK CONTROL VALVE
1.
Disassemble control valve assembly. Refer to
AT-431, "CONTROL VALVE ASSEMBLY"
2.
Check to ensure that:
–
Valve, sleeve and plug slide along valve bore under their own weight.
–
Valve, sleeve and plug are free from burrs, dents and scratches.
–
Control valve springs are free from damage, deformation and fatigue.
–
Hydraulic line is free from obstacles.
OK or NG
OK
>> GO TO 4.
NG
>> Repair control valve.
4.
CHECK SHIFT UP (D
3
TO D
4
)
Does A/T shift from D
3
to D
4
at the specified speed?
Yes or No
Yes
>> GO TO 5.
No
>> Check control valve again. Repair or replace control valve assembly.
5.
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure. Refer to
CODE (DTC) CONFIRMATION PROCEDURE"
.
OK or NG
OK
>> INSPECTION END.
NG
>>
●
Check for proper lock-up. GO TO 10.
SAT988H
SAT367H
DTC P0744 IMPROPER LOCK-UP OPERATION
AT-303
[RE4R01A]
D
E
F
G
H
I
J
K
L
M
A
B
AT
6.
CHECK LINE PRESSURE SOLENOID VALVE
1.
Remove control valve assembly. Refer to
2.
Check line pressure solenoid valve operation. Refer to
OK or NG
OK
>> GO TO 7.
NG
>> Replace solenoid valve assembly.
7.
CHECK CONTROL VALVE
1.
Disassemble control valve assembly. Refer to
AT-431, "CONTROL VALVE ASSEMBLY"
.
2.
Check line pressure circuit valves for sticking.
–
Pressure regulator valve
–
Pilot valve
–
Pressure modifier valve
OK or NG
OK
>> GO TO 8.
NG
>> Repair control valve.
8.
CHECK SHIFT UP (D
3
TO D
4
)
Does A/T shift from D
3
to D
4
at the specified speed?
Yes or No
Yes
>> GO TO 9.
No
>> Check control valve again. Repair or replace control valve assembly.
9.
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure. Refer to
CODE (DTC) CONFIRMATION PROCEDURE"
OK or NG
OK
>> INSPECTION END.
NG
>>
●
Check for proper lock-up. GO TO 10.
10.
CHECK LOCK-UP CONDITION
During
AT-223, "Cruise Test — Part 1"
Does A/T perform lock-up at the specified speed?
Yes or No
Yes
>> Perform “Cruise Test
− Part 1” again and return to the start point of this flow chart.
No
>> GO TO 11.
11.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
1.
Remove control valve assembly. Refer to
2.
Check torque converter clutch solenoid valve operation.
Refer to
AT-297, "TORQUE CONVERTER CLUTCH SOLENOID VALVE"
.
OK or NG
OK
>> GO TO 12.
NG
>> Replace solenoid valve assembly.
SAT367H
AT-304
[RE4R01A]
DTC P0744 IMPROPER LOCK-UP OPERATION
12.
CHECK CONTROL VALVE
1.
Disassemble control valve assembly. Refer to
AT-431, "CONTROL VALVE ASSEMBLY"
2.
Check control valves for sticking.
–
Torque converter clutch control valve
–
Torque converter clutch relief valve
OK or NG
OK
>> GO TO 13.
NG
>> Repair control valve.
13.
CHECK LOCK-UP CONDITION
Does A/T perform lock-up at the specified speed?
Yes or No
Yes
>> GO TO 14.
No
>> Check control valve again. Repair or replace control valve assembly.
14.
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure. Refer to
CODE (DTC) CONFIRMATION PROCEDURE"
.
OK or NG
OK
>> INSPECTION END.
NG
>> Perform “Cruise Test — Part 1” again and return to the start point of this flow chart.
Component Inspection
ECS007N6
SOLENOID VALVES
●
For removal, refer to
.
SAT367H
AAT614A
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