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Nissan Frontier D22. Manual - part 78

DTC P0733 IMPROPER SHIFTING TO 3RD GEAR POSITION

AT-281

[RE4R01A]

DTC P0733 IMPROPER SHIFTING TO 3RD GEAR POSITION

PFP:31940

Description

ECS007MR

●

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 third 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, malfunctioning servo piston or brake band,
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 (3rd) 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 A is stuck closed.

*: P0733 is detected.

Gear position

Shift solenoid valve A

ON (Closed)

OFF (Open)

ON (Closed)

Shift solenoid valve B

ON (Closed)

OFF (Open)

Terminal

No.

Wire color

Item

Condition

Judgement stan-

dard (Approx.)

L/W

Shift solenoid
valve A

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

or D

)

Battery voltage

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

or D

)

Gear position supposed by TCM

In case of gear position with no malfunctions

In case of gear position with shift solenoid valve A stuck
closed

Diagnostic trouble code

Malfunction is detected when ...

Check item

(Possible cause)

: A/T 3RD GR FNCTN

A/T cannot be shifted to the 3rd gear posi-
tion even if electrical circuit is good.

●

Shift solenoid valve A

●

Each clutch

●

Hydraulic control circuit

: P0733

AT-282

[RE4R01A]

DTC P0733 IMPROPER SHIFTING TO 3RD GEAR POSITION

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

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

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).

Select “3RD GR FNCTN P0733” of “DTC WORK SUPPORT”
mode for “A/T” with CONSULT-II and touch “START”.

Accelerate vehicle to 70 to 85 km/h (43 to 53 MPH) under the
following condition and release the accelerator pedal com-
pletely.
THROTTLE POSI: Less than 1/8 (at all times during step 4)
Selector lever: D position (O/D ON)

–

Check that “GEAR” shows 4 after releasing pedal.

Depress accelerator pedal steadily with 3.5/8 - 4.5/8 of “THROT-
TLE POSI” from a speed of 70 to 85 km/h (43 to 53 MPH) until
“TESTING” changes to “STOP VEHICLE” or “COMPLETED”. (It
will take approximately 3 seconds.)
If the check result NG appears on CONSULT-II screen, go to

AT-284, "Diagnostic Procedure"

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

–

Check that “GEAR” shows 3 when depressing accelerator pedal with 3.5/8 - 4.5/8 of “THROTTLE
POSI”.

–

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 P0733 is shown, refer to applicable “TROUBLE DIAG-
NOSIS FOR DTC”.

Stop vehicle.

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

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

AT-284, "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.

→ 2 → 3 → 4

Malfunction for P0733 exists.

→ 1 → 4 → 4

SAT014K

SAT971J

SAT021J

DTC P0733 IMPROPER SHIFTING TO 3RD GEAR POSITION

AT-283

[RE4R01A]

Wiring Diagram — AT — 3RD

ECS007MS

WCWA0151E

AT-284

[RE4R01A]

DTC P0733 IMPROPER SHIFTING TO 3RD GEAR POSITION

Diagnostic Procedure

ECS007MT

CHECK SHIFT SOLENOID VALVE

Remove control valve assembly. Refer to

AT-402, "REMOVAL"

Check shift solenoid valve operation.

–

Shift solenoid valve A

Refer to

AT-315, "SHIFT SOLENOID VALVE A"

OK or NG

>> GO TO 2.

>> Repair or replace shift solenoid valve assembly.

CHECK CONTROL VALVE

Disassemble control valve assembly.
Refer to

AT-431, "CONTROL VALVE ASSEMBLY"

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

>> GO TO 3.

>> Repair control valve assembly.

CHECK DTC

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

AT-282, "DIAGNOSTIC TROUBLE

CODE (DTC) CONFIRMATION PROCEDURE"

OK or NG

>> INSPECTION END.

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

SAT367H

Content .. 76 77 78 79 ..