2001 NISSAN X-TRAIL Service Repair Manual

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Page 2225 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0733 A/T 3RD GEAR FUNCTION
AT-147
[EURO-OBD]
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Diagnostic ProcedureECS004RK
1.CHECK SHIFT SOLENOID VALVE
1. Remove control valve assembly. Refer to AT- 4 1 4 , "
REM

Page 2226 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual AT-148
[EURO-OBD]
DTC P0733 A/T 3RD GEAR FUNCTION
Component Inspection
ECS004RL
SHIFT SOLENOID VALVE A
●For removal, refer to AT- 4 1 4 , "Control Valve Assembly and
Accumulators" .

Page 2227 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0734 A/T 4TH GEAR FUNCTION
AT-149
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DTC P0734 A/T 4TH GEAR FUNCTIONPFP:31940
DescriptionECS004RM
●This malfunction will not be detected while the O/D OFF indi

DTC P0734 A/T 4TH GEAR FUNCTION
AT-149
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DTC P0734 A/T 4TH GEAR FUNCTIONPFP:31940
DescriptionECS004RM
●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 line pressure is low 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.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)
Monitor item Condition Specification
Line pressure solenoid valve dutySmall throttle opening
(Low line pressure)
↓
Large throttle opening
(High line pressure)Approximately 24%
↓
Approximately 95%
Te r m i -
nal No.Wire color Item ConditionJudgement stan-
dard
(Approx.)
1R/WLine pressure
solenoid valveWhen releasing accelerator pedal
after warming up engine.1.5 - 3.0V
When depressing accelerator pedal
fully after warming up engine.0V
2P/BLine pressure
solenoid valve
(with dropping
resistor)When releasing accelerator pedal
after warming up engine.5 - 14V
When depressing accelerator pedal
fully after warming up engine.0V
11 L / WShift solenoid
valve AWhen shift solenoid valve A oper-
ates.
(When driving in “D
1 ” or “D4 ”.)Battery voltage
When shift solenoid valve A does not
operate.
(When driving in “D
2 ” or “D3 ”.)0V
12 L/YShift solenoid
valve BWhen shift solenoid valve B oper-
ates.
(When driving in “D
1 ” or “D2 ”.)Battery voltage
When shift solenoid valve B does not
operate.
(When driving in “D
3 ” or “D4 ”.)0V

Page 2228 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual AT-150
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION
ON BOARD DIAGNOSTIC LOGIC
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM as
follows:
Torqu

AT-150
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION
ON BOARD DIAGNOSTIC 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 A is stuck open or shift solenoid valve B is stuck
closed.
*: P0734 is detected.
And also, this malfunction will be caused when line pressure is lower than normal same as line pressure sole-
noid valve stuck open.
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE
CAUTION:
●Always drive vehicle at a safe speed.
●If conducting this “DTC CONFIRMATION PROCEDURE”
again, always turn ignition switch “OFF” and wait at least 5
seconds before continuing.
●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 CONDITION:
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.
Gear position supposed by TCM 1 2 3 4
In case of gear position with no malfunctions 1 2 34
In case of gear position with shift solenoid valve A stuck open2233*
In case of gear position with shift solenoid valve B stuck closed 1 2 21*
Diagnostic trouble code Malfunction is detected when... Check items (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

Page 2229 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0734 A/T 4TH GEAR FUNCTION
AT-151
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With CONSULT-II
1. Start engine and select “DATA MONITOR” mode for “A/T” with CONSULT-II.
2. Make sure that output

DTC P0734 A/T 4TH GEAR FUNCTION
AT-151
[EURO-OBD]
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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 55 to 65 km/h (34 to 40 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 (OD “ON”)
●Check that “GEAR” shows “3” after releasing pedal.
5. Depress accelerator pedal steadily with 1.0/8 - 2.0/8 of “THROT-
TLE POSI” from a speed of 55 to 65 km/h (34 to 40 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-153, "
Diagnostic Procedure" .
If “STOP VEHICLE” appears on CONSULT-II screen, go to following step.
●Check that “GEAR” shows “4” when depressing accelerator pedal with 1.0/8 - 2.0/8 of “THROTTLE
POSI”.
●If “TESTING” does not appear on CONSULT-II for a long time, select “SELF-DIAGNOSIS” 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-153, "
Diagnostic Procedure" .)
Refer to AT- 1 5 3 , "
Diagnostic Procedure" .
Refer to AT- 5 2 1 , "
Shift Schedule" .
With GST
Follow the procedure “With CONSULT-II”.
Vehicle conditionGear 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.2→ 2 → 3 → 3
1→ 2 → 2 → 1
SAT021J

Page 2230 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual AT-152
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION
Wiring Diagram — AT — 4TH
ECS004RN
TCWA0052E

Page 2231 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0734 A/T 4TH GEAR FUNCTION
AT-153
[EURO-OBD]
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Diagnostic ProcedureECS004RO
1.CHECK SHIFT UP (D3 TO D4 )
During “Cruise test — Part 1” (AT- 7 8 , "
Cruise Tes

Page 2232 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual AT-154
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION
4. CHECK CONTROL VALVE
1. Disassemble control valve assembly.
Refer to AT- 4 4 8 , "
Control Valve Assembly" .
2. Check to ensure that:
●V

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