Nissan Frontier D22. Manual - part 83

 

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Nissan Frontier D22. Manual - 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 

AT-214, "Line Pressure Test"

 .

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 

AT-299, "DIAGNOSTIC TROUBLE

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 

AT-402, "REMOVAL"

 .

2.

Check line pressure solenoid valve operation. Refer to 

AT-304, "SOLENOID VALVES"

 .

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 

AT-299, "DIAGNOSTIC TROUBLE

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 

AT-402, "REMOVAL"

 .

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 

AT-299, "DIAGNOSTIC TROUBLE

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 

AT-402, "REMOVAL"

 .

SAT367H

AAT614A

 

 

 

 

 

 

 

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