Nissan Frontier D22. Manual - part 79

DTC P0733 IMPROPER SHIFTING TO 3RD GEAR POSITION

AT-285

[RE4R01A]

D

E

F

G

H

I

J

K

L

M

A

B

AT

Component Inspection

ECS007MU

SHIFT SOLENOID VALVE A

●

For removal, refer to 

AT-402, "REMOVAL"

 .

Resistance Check

●

Check resistance between terminal 3 and ground.

Operation Check

●

Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal 3 and ground.

SAT654I

Solenoid valve

Terminal No.

Resistance (Approx.)

Shift solenoid valve A

3

Ground

20 - 40

Ω

SAT653I

AT-286

[RE4R01A]

DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION

DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION

PFP:31940

Description

ECS007MV

●

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 fourth gear position or the torque converter
clutch does not lock up 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, malfunctioning oil pump or torque converter clutch, etc.

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE

Remarks: Specification data are reference values.

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 much lower than the position (4th) supposed by TCM, the slip ratio will be much
less than normal. In case the ratio does not reach the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when shift solenoid valve B is stuck closed.

Monitor item

Condition

Specification (Approx.)

Torque converter clutch sole-
noid valve duty

Lock-up OFF

↓

Lock-up ON

4%

↓

94%

Line pressure solenoid valve 
duty

Small throttle opening (Low line pressure)

↓

Large throttle opening (High line pressure)

24%

↓

95%

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.)

1

GY/R

Line pressure 
solenoid valve

When releasing accelerator pedal 
after warming up engine.

1.5 - 2.5V

When depressing accelerator pedal 
fully after warming up engine.

0V

2

BR/Y

Line pressure 
solenoid valve 
(with dropping 
resistor)

When releasing accelerator pedal 
after warming up engine.

4 - 14V

When depressing accelerator pedal 
fully after warming up engine.

0V

11

L/W

Shift solenoid 
valve A

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

1

  or D

4

 .)

Battery voltage

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

2

  or D

3

 .)

0V

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

DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION

AT-287

[RE4R01A]

D

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AT

*: P0734 is detected.

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE

CAUTION:

●

Always drive vehicle at a safe speed.

●

Be careful not to rev engine into the red zone on the
tachometer.

NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch OFF and wait at least 5 seconds before conducting the
next test.
TESTING CONDITIONS:
Always drive vehicle on a level road to improve the accuracy of
test.
After the repair, perform the following procedure to confirm the mal-
function is eliminated.

With CONSULT-II

1.

Start engine and select “DATA MONITOR” mode for “A/T” with
CONSULT-II.

2.

Make sure that output voltage of A/T fluid temperature sensor is
within the range below.
FLUID TEMP SEN: 0.4 - 1.5V
If out of range, drive the vehicle to decrease the voltage (warm
up the fluid) or stop engine to increase the voltage (cool down
the fluid).

3.

Select  “4TH GR FNCTN P0734” of “DTC WORK SUPPORT”
mode for “A/T” with CONSULT-II and touch “START”.

4.

Accelerate vehicle to 50 to 60 km/h (31 to 37 MPH) under the
following condition and release the accelerator pedal com-
pletely.
THROTTLE POSI: Less than 5.5/8 (at all times during step 4)
Selector lever: D position (O/D ON)

–

Check that “GEAR” shows 3 after releasing pedal.

5.

Depress accelerator pedal steadily with 1/8 - 2/8 of “THROTTLE
POSI” from a speed of 50 to 60 km/h (31 to 37 MPH) until
“TESTING” has turned to “STOP VEHICLE” or “COMPLETED”.
(It will take approximately 3 seconds.)
If the check result NG appears on CONSULT-II screen, go to 

AT-290, "Diagnostic Procedure"

 .

If “STOP VEHICLE” appears on CONSULT-II screen, go to following step.

–

Check that “GEAR” shows 4 when depressing accelerator pedal with 1/8 - 2/8 of “THROTTLE
POSI”.

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 
closed

1

2

2

1*

Diagnostic trouble code

Malfunction is detected when ...

Check item

(Possible cause)

: A/T 4TH GR FNCTN

A/T cannot be shifted to the 4th gear posi-
tion even if electrical circuit is good.

●

Shift solenoid valve A

●

Shift solenoid valve B

●

Line pressure solenoid valve

●

Each clutch

●

Hydraulic control circuit

: P0734

SAT014K

SAT971J

SAT021J

AT-288

[RE4R01A]

DTC P0734 IMPROPER SHIFTING TO 4TH GEAR POSITION

–

If “TESTING” does not appear on CONSULT-II for a long time, select “SELF-DIAG RESULTS” for
“ENGINE”. In case a 1st trip DTC other than P0734 is shown, refer to applicable “TROUBLE DIAG-
NOSIS FOR DTC”.

6.

Stop vehicle.

7.

Follow the instruction displayed. (Check for normal shifting referring to the table below.)

8.

Make sure that “OK” is displayed. (If “NG” is displayed, refer to 

AT-290, "Diagnostic Procedure"

 .

Refer to 

AT-496, "Shift Schedule"

 .

 With GST

●

Follow the procedure “With CONSULT-II”.

Vehicle condition

Gear on actual transmission shift pattern when 

screen is changed to 1 

→ 2 → 3 → 4

No malfunction exists

1 

→ 2 → 3 → 4

Malfunction for P0734 exists.

1 

→ 2 → 2 → 1