NISSAN X-TRAIL 2003 Electronic Repair Manual

DTC P0734 A/T 4TH GEAR FUNCTION
AT-175
[EURO-OBD]
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Wiring Diagram — AT — 4THECS004RN
TCWA0052E

AT-176
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION
Diagnostic Procedure
ECS004RO
1.CHECK SHIFT UP (D3TO D4)
During “Cruise test — Part 1” (AT- 7 8 , "
Cruise Test—Part 1"), does
A/T shift from D
3to D4at the specified speed?
Ye s o r N o
Yes >>GOTO9
No >> GO TO 2
2.CHECK LINE PRESSURE
Perform line pressure test.
Refer toAT-68, "
Line Pressure Test".
OK or NG
OK >> GO TO 3
NG >> GO TO 6
3.CHECK SOLENOID VALVES
1. Remove control valve assembly.
Refer toAT-454, "
REMOVAL".
2. Refer to “Component Inspection”,AT-179, "
Component Inspec-
tion".
OK or NG
OK >> GO TO 4
NG >> Replace solenoid valve assembly.
SAT988H
Engine speed rpmLine pressure kPa ( kg/cm2
,psi)
D, 2 and 1 positions R position
Idle 500 ( 5.1, 73 ) 778 ( 7.9, 113 )
Stall 1,233 ( 12.6, 179 ) 1,918 ( 19.6, 278 )
SCIA0759E

DTC P0734 A/T 4TH GEAR FUNCTION
AT-177
[EURO-OBD]
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4.CHECK CONTROL VALVE
1. Disassemble control valve assembly.
Refer to $$$$$.
2. Check to ensure that:
lValve, sleeve and plug slide along valve bore under their own weight.
lValve, sleeve and plug are free from burrs, dents and scratches.
lControl valve springs are free from damage, deformation and fatigue.
lHydraulic line is free from obstacles.
OK or NG
OK >> GO TO 5
NG >> Repair control valve.
5.CHECK SHIFT UP (D3TO D4)
Does A/T shift from D
3to D4at the specified speed?
OK or NG
OK >> GO TO 9
NG >> Check control valve again. Repair or replace control valve assembly.
6.CHECK LINE PRESSURE SOLENOID VALVE
1. Remove control valve assembly.
Refer toAT- 4 5 4 , "
REMOVAL".
2. Refer to “Component Inspection”,AT- 1 7 9 , "
Component Inspec-
tion".
OK or NG
OK >> GO TO 7
NG >> Replace solenoid valve assembly.
SCIA0745E

AT-178
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION
7.CHECK CONTROL VALVE
1. Disassemble control valve assembly.
Refer toAT-489, "
Control Valve Assembly".
2. Check line pressure circuit valves for sticking.
lPressure regulator valve
lPilot valve
lPressure modifier valve
OK or NG
OK >> GO TO 8
NG >> Repair control valve.
8.CHECK SHIFT UP (D3TO D4)
Does A/T shift from D
3to D4at the specified speed?
Ye s o r N o
Yes >>GOTO9
No >> Check control valve again. Repair or replace control valve assembly.
9.CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure,AT- 1 7 3 , "
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

DTC P0734 A/T 4TH GEAR FUNCTION
AT-179
[EURO-OBD]
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Component InspectionECS004RP
SOLENOID VALVES
lFor removal, refer toAT-454, "REMOVAL".
Resistance Check
lCheck resistance between two terminals.
SCIA0760E
Solenoid valve Terminal No.Resistance
(Approx.)
Shift solenoid
valve A2
Ground20 - 30W
Shift solenoid
valve B15-20W
Line pressure
solenoid valve42.5-5W

AT-180
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION
Operation Check
lCheck solenoid valve by listening for its operating sound while
applying battery voltage to the terminal and ground.
SCIA0759E

DTCP0740TORQUECONVERTERCLUTCHSOLENOIDVALVE
AT-181
[EURO-OBD]
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DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP: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
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE
SCIA0718E
Monitor item Condition Specification
Torque converter clutch solenoid valve
dutyLock-up “OFF”
¯
Lock-up “ON”Approximately 4%
¯
Approximately 94%
Te r m i -
nal No.Wire color Item ConditionJudgement stan-
dard
(Approx.)
3GY/RTorque converter
clutch solenoid
valveWhen 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.
lHarness or connectors
(The solenoid circuit is open or shorted.)
lT/C clutch solenoid valve
: P0740

AT-182
[EURO-OBD]
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
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.
After the repair, perform the following procedure to confirm the mal-
function is eliminated.
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select“DATAMONITOR”modefor“ENGINE”withCONSULT-II
and wait at least 1 second.
With GST
Follow the procedure “With CONSULT-II”.
SAT014K
SAT020K

DTCP0740TORQUECONVERTERCLUTCHSOLENOIDVALVE
AT-183
[EURO-OBD]
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Wiring Diagram — AT — TCVECS004RR
TCWA0043E

AT-184
[EURO-OBD]
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Diagnostic Procedure
ECS004RS
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 toAT-454, "
ON-VEHICLE
SERVICE".
2. Check the following items:
–Torque converter clutch solenoid valve
Refer to “Component Inspection”,AT-185, "
Compo-
nent 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,AT- 1 8 1 , "
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 - 20W
SCIA0731E
Continuity should exist.
SCIA0732E