2003 NISSAN X-TRAIL Service Repair Manual

relay maintenance reset alarm brake light steering high beam

Page 2177 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0734 A/T 4TH GEAR FUNCTION
AT-141
[EURO-OBD]
D
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F
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B
AT

Possible CauseECS00CU2
Check the following items.
Shift solenoid valve A
Shift solenoid valve B
Line pressure solenoid

DTC P0734 A/T 4TH GEAR FUNCTION
AT-141
[EURO-OBD]
D
E
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B
AT

Possible CauseECS00CU2
Check the following items.
Shift solenoid valve A
Shift solenoid valve B
Line pressure solenoid valve
Each clutch
Hydraulic control circuit
DTC Confirmation ProcedureECS00CU3
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 “DTC Confirmation Procedure” 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 malfunction 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 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-
144, "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”.
SAT014K
SCIA5358E

Page 2178 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual AT-142
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION

–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 P

Page 2179 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0734 A/T 4TH GEAR FUNCTION
AT-143
[EURO-OBD]
D
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Wiring Diagram — AT — 4THSIGECS004RN
TCWA0052E

Page 2180 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual AT-144
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION

TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL
Diagnostic ProcedureECS004RO
1. CHECK SHIFT UP (D3 TO D4 )
During AT- 7 8 , "
Cruise

Page 2181 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0734 A/T 4TH GEAR FUNCTION
AT-145
[EURO-OBD]
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3. CHECK SOLENOID VALVES
1. Remove control valve assembly. Refer to AT- 4 0 4 , "
Control Valve Assembly and Accumulators

Page 2182 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual AT-146
[EURO-OBD]
DTC P0734 A/T 4TH GEAR FUNCTION

5. CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT- 4 4 8 , "
Control Valve Assembly" .
2. Check to ensure that:
Valve, sle

Page 2183 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0734 A/T 4TH GEAR FUNCTION
AT-147
[EURO-OBD]
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9. CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT- 4 4 8 , "
Control Valve Assembly" .
2. Check l

Page 2184 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual AT-148
[EURO-OBD]
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP:31940
DescriptionECS004RQ
The torque converter clutch solenoid valve is activat

AT-148
[EURO-OBD]
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE

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.
On Board Diagnosis LogicECS00CU4
Possible CauseECS00CU5
Check the following items.
Torque converter clutch solenoid valve
Harness or connector
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureECS00CU6
CAUTION:
Always drive vehicle at a safe speed.
If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait
at least 10 seconds before continuing.
NOTE:
If “DTC 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 malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” 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.
4. If the check result is NG go to AT- 1 5 1 , "
Diagnostic Procedure" .
SCIA0718E
Monitor item Condition Specification
Torque converter clutch solenoid valve
dutyLock-up OFF
↓
Lock-up ONApproximately 4%
↓
Approximately 94%
Diagnostic trouble code Malfunction is detected when... Check items (Possible cause)
: T/C CLUTCH SOL/V
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
SAT014K

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