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Nissan Teana J32. Manual - part 1177
TM-232
< COMPONENT DIAGNOSIS >
[CVT: RE0F10A]
P0744 A/T TCC S/V FUNCTION (LOCK -UP)
P0744 A/T TCC S/V FUNCTION (LOCK -UP)
Description
INFOID:0000000003806410
This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM. This
is not only caused by electrical malfunctions (circuits open or shorted), but also by mechanical malfunctions
such as control valve sticking, improper solenoid valve operation, etc.
DTC Logic
INFOID:0000000003806411
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch
OFF. Then wait at least 10 seconds before performing the next test.
Perform the following procedure to confirm the malfunction is eliminated after the repair.
1.
CHECK DTC DETECTION
With CONSULT-III
1.
Turn ignition switch ON.
2.
Select “Data Monitor” mode for “TRANSMISSION”.
3.
Start engine and maintain the following condition for at least 30 seconds.
With GST
Follow the procedure “With CONSULT-III”.
Is “P0744 A/T TCC S/V FNCTN” detected?
YES
>> Go to
NO
>> Check intermittent incident. Refer to
GI-35, "Intermittent Incident"
.
Diagnosis Procedure
INFOID:0000000003806412
1.
CHECK LINE PRESSURE
Perform line pressure test. Refer to
TM-308, "Inspection and Judgment"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace damaged parts. Refer to
TM-308, "Inspection and Judgment"
.
2.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
1.
Turn ignition switch OFF.
2.
Disconnect CVT unit connector.
DTC
Item
(CONSULT-III screen term)
Malfunction is detected when...
Possible cause
P0744
A/T TCC S/V FNCTN
• CVT cannot perform lock-up
even if electrical circuit is
good.
• TCM detects as irregular by
comparing reference value
with slip rotation.
• There is a big difference be-
tween engine speed and pri-
mary speed sensor when
TCM lock-up signal is on.
• Torque converter clutch sole-
noid valve
• Hydraulic control circuit
ACC PEDAL OPEN
: More than 1.0/8
RANGE
: “D” position
VEHICLE SPEED
: Constant speed of more than 40 km/h (25 MPH)