Nissan Altima 2007-2012 Service Manual: P0740 torque converter clutch solenoid valve
Description
• The torque converter clutch solenoid valve is activated by the TCM in response to signals sent from the vehicle speed and accelerator pedal position sensors. Lock-up piston operation will then be controlled.
• Lock-up operation, however, is prohibited when CVT fluid temperature is too low.
• When the accelerator pedal is depressed (less than 2.0/8) 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.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
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.
1.CHECK DTC DETECTION
1. Turn ignition switch ON.
2. Wait at least 10 consecutive seconds.
3. Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.
Follow the procedure “With CONSULT-III”.
Is “P0740 TCC SOLENOID/CIRC” detected? YES >> Go to TM-144, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-42, "Intermittent Incident".
Diagnosis Procedure
1.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM harness connector.
3. Check resistance between TCM harness connector F16 terminal 38 and ground.
Is the inspection result normal? YES >> GO TO 5.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN TCM AND CVT UNIT (TORQUE CONVERTER CLUTCH SOLENOID VALVE) (PART 1)
1. Disconnect CVT unit harness connector.
2. Check continuity between TCM harness connector F16 (A) terminal 38 and CVT unit harness connector F46 (B) terminal 12.
Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK HARNESS BETWEEN TCM AND CVT UNIT (TORQUE CONVERTER CLUTCH SOLENOID VALVE) (PART 2)
Check continuity between TCM harness connector F16 terminal 38 and ground.
Is the inspection result normal? YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check torque converter clutch solenoid valve. Refer to TM-145, "Component Inspection (Torque Converter Clutch Solenoid Valve)".
Is the inspection result normal? YES >> GO TO 5.
NO >> Replace transaxle assembly. Refer to TM-259, "Exploded View".
5.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal? YES >> Replace TCM. Refer to TM-254, "Exploded View".
NO >> Repair or replace damaged parts.
Component Inspection (Torque Converter Clutch Solenoid Valve)
1.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check resistance between CVT unit terminal 12 and ground.
Is the inspection result normal? YES >> INSPECTION END
NO >> Replace transaxle assembly. Refer to TM-259, "Exploded View".
P0730 belt damage
Description
TCM selects the gear ratio using the engine load (throttle position), the
primary pulley revolution speed, and
the secondary pulley revolution speed as input signal. Then it changes t ...
P0744 a/t tcc s/v function (lock -up)
Description
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 malfunction (circuits open or shorted), ...
Other materials:
Normal operating condition
Description
The majority of the audio concerns are the result of outside causes (bad CD,
electromagnetic interference,
etc.).
NOISE
The following noise results from variations in field strength, such as fading
noise and multi-path noise, or
external noise from trains and other sources. It i ...
BCM (Body control module)
Diagnosis Procedure
1. CHECK FUSE AND FUSIBLE LINK
Check if the following BCM fuse or fusible link are blown.
Is the fuse or fusible link blown?
YES >> Replace the blown fuse or fusible link after repairing the affected
circuit.
NO >> GO TO 2
2. CHECK POWER SUPPLY CIRCUIT
1. ...
U1000 CAn comm circuit
Description
CAN (Controller Area Network) is a serial communication line for real time
application. It is an on-vehicle multiplex
communication line with high data communication speed and excellent malfunction
detection ability.
Many electronic control units are equipped onto a vehicle, and ...