2001 NISSAN X-TRAIL clutch

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 , "
REMOVAL" .
2. Check shift solenoid valve operation.
●Shift solenoid valve A
Refer to “Component Inspection” below.
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-448, "
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- 1 4 3 , "
DTC P0733 A/T 3RD
GEAR FUNCTION" .
OK or NG
OK >>INSPECTION END
NG >> Check transaxle inner parts (clutch, brake, etc.).
SCIA0722E
SAT367H

DTC P0734 A/T 4TH GEAR FUNCTION
AT-149
[EURO-OBD]
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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

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

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:
●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 5.
NG >> Repair control valve.
5. CHECK SHIFT UP (D3 TO D4 )
Does A/T shift from D
3 to D4 at the specified speed?
OK or NG
OK >> GO TO 9.
NG >> Check transaxle inner parts (clutch, brake, etc.).
6. CHECK LINE PRESSURE SOLENOID VALVE
1. Remove control valve assembly.
Refer to AT- 4 1 4 , "
REMOVAL" .
2. Refer to AT- 1 5 6 , "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Replace solenoid valve assembly.
SCIA0745E

DTC P0734 A/T 4TH GEAR FUNCTION
AT-155
[EURO-OBD]
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7.CHECK CONTROL VALVE
1. Disassemble control valve assembly.
Refer to AT-448, "
Control Valve Assembly" .
2. Check line pressure circuit valves for sticking.
●Pressure regulator valve
●Pilot valve
●Pressure modifier valve
OK or NG
OK >> GO TO 8.
NG >> Repair control valve.
8.CHECK SHIFT UP (D3 TO D4 )
Does A/T shift from D
3 to D4 at the specified speed?
Ye s o r N o
Ye s > > G O T O 9 .
No >> Check transaxle inner parts (clutch, brake, etc.).
9.CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure. Refer to AT- 1 5 0 , "
DIAGNOSTIC TROUBLE
CODE (DTC) CONFIRMATION PROCEDURE" .
OK or NG
OK >>INSPECTION END
NG >> Perform “Cruise test — Part 1” again and return to the start point of this test group.
SAT367H

AT-158
[EURO-OBD]
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
PFP:31940
DescriptionECS004RQ
The torque converter clutch solenoid valve is activated, with the gear
in “D
4 ”, by the TCM in response to signals sent from the vehicle
speed and throttle position sensors. Lock-up piston operation will
then be controlled.
Lock-up operation, however, is prohibited when A/T fluid tempera-
ture is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up
condition, the engine speed should not change abruptly. If there is a
big jump in engine speed, there is no lock-up.
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
SCIA0718E
Monitor item Condition Specification
Torque converter clutch solenoid valve
dutyLock-up “OFF”
↓
Lock-up “ON”Approximately 4%
↓
Approximately 94%
Termi-
nal No.Wire color Item ConditionJudgement stan-
dard
(Approx.)
3GY/RTorque converter
clutch solenoid
valve When A/T performs lock-up. 8 - 15V
When A/T does not perform lock-up. 0V
Diagnostic trouble code Malfunction is detected when... Check items (Possible cause)
: TCC SOLENOID/CIRC
TCM detects an improper voltage drop
when it tries to operate the solenoid valve.
●Harness or connectors
(The solenoid circuit is open or shorted.)
●T/C clutch solenoid valve
: P0740

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-159
[EURO-OBD]
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DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE” has been previously conducted,
always turn ignition switch “OFF” and wait at least 5 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the mal-
function is eliminated.
With CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-II
and wait at least 1 second.
3. Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL SPEED SE: 80 km/h (50 MPH) or more
THROTTLE POSI : 0.5/8 - 1.0/8
Selector lever: D position (OD “ON”)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
With GST
Follow the procedure “With CONSULT-II”.
SAT014K
SAT020K

AT-160
[EURO-OBD]
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Wiring Diagram — AT — TCV
ECS004RR
TCWA0043E