Nissan Frontier D22. Manual - part 76

DTC P0731 IMPROPER SHIFTING TO 1ST GEAR POSITION

AT-273

[RE4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

Wiring Diagram — AT — 1ST

ECS007MK

WCWA0150E

AT-274

[RE4R01A]

DTC P0731 IMPROPER SHIFTING TO 1ST GEAR POSITION

Diagnostic Procedure

ECS007ML

1. 

CHECK SHIFT SOLENOID VALVE

1.

Remove control valve assembly. Refer to 

AT-431, "CONTROL VALVE ASSEMBLY"

 .

2.

Check shift solenoid valve operation.

–

Shift solenoid valve A

–

Shift solenoid valve B

Refer to 

AT-275, "Component Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace shift solenoid valve assembly.

2. 

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 3.

NG

>> Repair control valve assembly.

3. 

CHECK DTC

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

AT-271, "DIAGNOSTIC TROUBLE

CODE (DTC) CONFIRMATION PROCEDURE"

 .

OK or NG

OK

>> INSPECTION END.

NG

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

SAT367H

DTC P0731 IMPROPER SHIFTING TO 1ST GEAR POSITION

AT-275

[RE4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

Component Inspection

ECS007MM

SHIFT SOLENOID VALVE A AND B

●

For removal, refer to

AT-431, "CONTROL VALVE ASSEMBLY"

 .

Resistance Check

●

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

Operation Check

●

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

SAT649I

Solenoid valve

Terminal No.

Resistance (Approx.)

Shift solenoid valve A

3

Ground

20 - 40

Ω

Shift solenoid valve B

2

SAT648I

AT-276

[RE4R01A]

DTC P0732 IMPROPER SHIFTING TO 2ND GEAR POSITION

DTC P0732 IMPROPER SHIFTING TO 2ND GEAR POSITION

PFP:31940

Description

ECS007MN

●

This is an OBD-II self-diagnostic item and not available in TCM self-diagnosis.

●

This malfunction will not be detected while the O/D OFF indicator lamp is indicating another self-diagnosis
malfunction.

●

This malfunction is detected when the A/T does not shift into second gear position as instructed by the
TCM. This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction
such as control valve sticking, improper solenoid valve operation, etc.

TCM TERMINALS AND REFERENCE VALUE

Remarks: Specification data are reference values.

ON BOARD DIAGNOSIS LOGIC

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM as
follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (2nd) supposed by TCM, the slip ratio will be more than
normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when shift solenoid valve B is stuck open.

*: P0732 is detected.

Gear position

1

2

3

4

Shift solenoid valve A

ON (Closed)

OFF (Open)

OFF (Open)

ON (Closed)

Shift solenoid valve B

ON (Closed)

ON (Closed)

OFF (Open)

OFF (Open)

Terminal 

No.

Wire color

Item

Condition

Judgement stan-

dard (Approx.)

12

L/Y

Shift solenoid 
valve B

When shift solenoid valve B oper-
ates. (When driving in “D

1

 ” or “D

2

 ”)

Battery voltage

When shift solenoid valve B does not 
operate. (When driving in “D

3

 ” or “D

4

 

”)

0V

Gear position supposed by TCM

1

2

3

4

In case of gear position with no malfunctions

1

2

3

4

In case of gear position with shift solenoid valve B stuck 
open

4

3*

3

4

Diagnostic trouble code

Malfunction is detected when ...

Check item

(Possible cause)

: A/T 2ND SIGNAL

A/T cannot be shifted to the 2nd gear 
position even if electrical circuit is good.

●

Shift solenoid valve B

●

Each clutch

●

Hydraulic control circuit

: P0732