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 Test — Part 1" ), 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 >> GO TO 2.
2.CHECK LINE PRESSURE
Perform line pressure test.
Refer to AT-67, "
Line Pressure Test" .
OK or NG
OK >> GO TO 3.
NG >> GO TO 6.
3.CHECK SOLENOID VALVES
1. Remove control valve assembly.
Refer to AT-414, "
REMOVAL" .
2. Refer to AT-156, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Replace solenoid valve assembly.
SAT988H
SCIA0759E

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-156
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION
Component Inspection
ECS004RP
SOLENOID VALVES
●For removal, refer to AT-414, "REMOVAL" .
Resistance Check
●Check resistance between two terminals.
SCIA0760E
Solenoid valve Terminal No.Resistance
(Approx.)
Shift solenoid
valve A2
Ground20 - 30Ω
Shift solenoid
valve B1 5 - 20Ω
Line pressure
solenoid valve4 2.5 - 5Ω

DTC P0734 A/T 4TH GEAR FUNCTION
AT-157
[EURO-OBD]
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Operation Check
●Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal and ground.
SCIA0759E

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

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-161
[EURO-OBD]
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Diagnostic ProcedureECS004RS
1.CHECK VALVE RESISTANCE
1. Turn ignition switch to “OFF” position.
2. Disconnect terminal cord assembly connector in engine compartment.
3. Check resistance between terminal 5 and ground.
OK or NG
OK >> GO TO 2.
NG >> 1. Remove oil pan. Refer to AT- 4 1 4 , "
ON-VEHICLE
SERVICE" .
2. Check the following items:
–Torque converter clutch solenoid valve
Refer to AT- 1 6 2 , "
Component Inspection" .
–Harness of terminal cord assembly for short or open
2.CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Disconnect TCM harness connector.
3. Check continuity between terminal 5 and TCM harness connector terminal 3.
If OK, check harness for short to ground and short to power.
4. Reinstall any part removed.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3.CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure. Refer to AT- 1 5 9 , "
DIAGNOSTIC TROUBLE
CODE (DTC) CONFIRMATION PROCEDURE" .
OK or NG
OK >>INSPECTION END
NG >> 1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector. Resistance: 5 - 20Ω
SCIA0731E
Continuity should exist.
SCIA0732E

AT-162
[EURO-OBD]
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Component Inspection
ECS004RT
TORQUE CONVERTER CLUTCH SOLENOID VALVE
●For removal, refer to AT-414, "REMOVAL" .
Resistance Check
●Check resistance between two terminals.
Operation Check
●Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal and ground.
SCIA0733E
Solenoid valve Terminal No.Resistance
(Approx.)
Torque converter
clutch solenoid
valve5 Ground 5 - 20Ω
SCIA0734E