Nissan Frontier D22. Manual — part 80

DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION

AT-289

[RE4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

Wiring Diagram — AT — 4TH

ECS007MW

WCWA0152E

AT-290

[RE4R01A]

DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION

Diagnostic Procedure

ECS007MX

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

>> GO TO 9.

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 7.

3.

CHECK SOLENOID VALVES

1.

Remove control valve assembly. Refer to

AT-402, "REMOVAL"

.

2.

Refer to

AT-315, "SHIFT SOLENOID VALVE A"

and

AT-320, "SHIFT SOLENOID VALVE B"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace solenoid valve assembly.

4.

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 5.

NG

>> Repair control valve.

5.

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.

SAT988H

SAT367H

DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION

AT-291

[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.

Refer to

AT-310, "LINE PRESSURE SOLENOID VALVE"

.

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?

OK or NG

OK

>> GO TO 9.

NG

>> Check control valve again. Repair or replace control valve assembly.

9.

CHECK DTC

Perform Diagnostic Trouble Code (DTC) confirmation procedure. Refer to

AT-287, "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.

SAT367H

AT-292

[RE4R01A]

DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION

Component Inspection

ECS007MY

SOLENOID VALVES

●

For removal, refer to

AT-402, "REMOVAL"

.

Resistance Check

●

Check resistance between terminals (3, 2, or 6) and ground.

Operation Check

●

Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminals (3, 2, 4, 6 or 7) and
ground.

AAT613A

Solenoid valve

Terminal No.

Resistance (Approx.)

Shift solenoid valve A

3

Ground

20 - 40

Ω

Shift solenoid valve B

2

Line pressure solenoid valve

6

2.5 - 5

Ω

SAT158J