Nissan Frontier D22. Manual — part 79
DTC P0733 IMPROPER SHIFTING TO 3RD GEAR POSITION
AT-285
[RE4R01A]
D
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A
B
AT
Component Inspection
ECS007MU
SHIFT SOLENOID VALVE A
●
For removal, refer to
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]
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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
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
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