Nissan Versa Sedan Service ManualTransmission & driveline » Transaxle & transmission (TM)
P0744 Torque converter
P0744 Torque converter
Description
This DTC is detected when the torque converter clutch solenoid valve is electrically normal but the torque converter clutch does not engage. This is not due to an electrical malfunction (circuit open or shorted), but is instead due to a mechanical malfunction (sticking of the control valve, malfunction of the solenoid, etc.).
DTC Logic
DTC DETECTION LOGIC
| DTC | Trouble diagnosis name | DTC detection condition | Possible causes |
| P0744 | Torque Converter Clutch Circuit Intermittent | The following diagnosis conditions
are met, and the torque
converter slip speed is at or
above a set value (40 rpm + Vehicle
speed / 2) continuously for
30 seconds or more. - Diagnosis condition - Lock-up pressure difference: More than Max. lock-up pressure difference × 0.95 |
- Torque converter clutch solenoid
valve - Control valve assembly - Torque converter |
DTC REPRODUCTION PROCEDURE
CAUTION: Be careful of the driving speed.
1.PREPARATION BEFORE WORK
If another "DTC CONFIRMATION PROCEDURE" occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
- Drive the vehicle.
- Maintain the following conditions for 35 seconds or more.
Selector lever : D position
Vehicle speed : 45 km/h (28 MPH) or more
3. Stop the vehicle.
4. Check the first trip DTC.
Is "P0744" detected?
YES >> Go to TM, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI, "Intermittent Incident".
Diagnosis Procedure
1.CHECK LINE PRESSURE
Perform line pressure test. Refer to TM, "Work Procedure".
Is the check result normal?
YES >> GO TO 2.
NO >> Repair or replace the malfunction items.
2.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
- Turn ignition switch OFF.
- Disconnect the A/T unit connector.
- Check the torque converter clutch solenoid valve. Refer to TM, "Component Inspection (Torque Converter Clutch Solenoid Valve)".
Is the check result normal?
YES >> Check intermittent incident. Refer to GI, "Intermittent Incident".
NO >> Repair or replace the malfunction items.
Component Inspection (Torque Converter Clutch Solenoid Valve)
1.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check the resistance between the A/T unit connector terminal and ground.
Is the check result normal?
YES >> INSPECTION END
NO >> There is a malfunction of the torque converter clutch solenoid valve. Replace the transaxle assembly. Refer to TM, "Removal and Installation".
Precautions
Structure and operation
Position switch
Gear oil
Side oil seal
Position switch
Control linkage
Air breather hose
5Th main gear assembly
Transaxle assembly
Transaxle assembly
Input shaft and gear
Mainshaft and gear
Final drive
Precautions
A/T Control system
A/T Shift lock system
Transaxle
A/T control system
Line pressure control
Shift change control
Lock-up control
Diagnosis description
Consult function
TCM
Diagnosis and repair work flow
Additional service when replacing TCM
Additional service when replacing transaxle assembly
A/T Fluid cooler
Stall test
Line pressure test
U0073 Communication bus a off
U0100 Lost communication (ECM A)
U0140 Lost communication (BCM)
U0155 Lost communication (IPC)
U0300 Can communication data
U1000 Can comm circuit
U1117 Lost communication (ABS)
P062F EEPROM
P0705 Transmission range switch A
P0706 Transmission range sensor A
P0711 Transmission fluid temperature sensor A
P0712 Transmission fluid temperature sensor A
P0713 Transmission fluid temperature sensor A
P0717 Input speed sensor A
P0720 Output speed sensor
P072C Stuck in 1GR
P072D Stuck in 2GR
P072E Stuck in 3GR
P072F Stuck in 4GR
P0731 1GR Incorrect ratio
P0732 2GR Incorrect ratio
P0733 3GR Incorrect ratio
P0734 4GR Incorrect ratio
P073E Unable to engage r range
P073F Unable to engage 1GR
P0740 Torque converter
P0743 Torque converter
P0744 Torque converter
P074A Unable to engage 2GR
P074B Unable to engage 3GR
P074C Unable to engage 4GR
P0863 TCM Communication
P0890 TCM
P0962 Pressure control solenoid A
P0963 Pressure control solenoid A
P0973 Shift solenoid A
P0974 Shift solenoid A
P0976 Shift solenoid B
P0977 Shift solenoid B
P0979 Shift solenoid C
P0980 Shift solenoid C
P0982 Shift solenoid D
P0983 Shift solenoid D
P2760 Torque converter
Main power supply and ground circuit
Overdrive control switch
O/D OFF indicator lamp
Shift position indicator circuit
Shift lock system
A/T Fluid
A/T Shift selector
Control cable
Key interlock cable
TCM
Oil pan
Output speed sensor
Differential side oil seal
Fluid cooler tube
Transmission assembly
Service data and specifications (SDS)
Precautions
Component parts
Shift lock system
Structure and operation
Fluid cooler & fluid warmer system
CVT Control system
Line pressure control
Shift control
Lock-up control
Idle neutral control
Diagnosis system (TCM)
TCM
Diagnosis and repair work flow
Additional service when replacing TCM
Additional service when replacing transaxle assembly
Calibration of G Sensor
CVT Fluid cooler system
Stall test
Line pressure test
U0073 Communication bus A off
U0100 Lost communication (ECM A)
U0140 Lost communication (BCM)
U0141 Lost communication (BCM A)
U0155 Lost communication (IPC)
U0300 Can communication data
U1000 Can COMM circuit
U1117 Lost communication (ABS)
P062F EEPROM
P0705 Transmission range sensor A
P0706 Transmission range sensor A
P0711 Transmission fluid temperature sensor A
P0712 Transmission fluid temperature sensor A
P0713 Transmission fluid temperature sensor A
P0715 Input speed sensor A
P0720 Output speed sensor
P0740 Torque converter
P0743 Torque converter
P0744 Torque converter
P0746 Pressure control solenoid A
P0846 Transmission fluid pressure SEN/SW B
P0847 Transmission fluid pressure SEN/SW B
P0848 Transmission fluid pressure SEN/SW B
P0863 TCM Communication
P0890 TCM
P0962 Pressure control solenoid A
P0963 Pressure control solenoid A
P0965 Pressure control solenoid B
P0966 Pressure control solenoid B
P0967 Pressure control solenoid B
P0998 Shift solenoid F
P0999 Shift solenoid F
P099B Shift solenoid G
P099C Shift solenoid G
P1586 G Sensor
P1588 G Sensor
P2765 Clutch B speed sensor
P2857 Clutch A pressure
P2858 Clutch B pressure
P2859 Clutch A pressure
P285A Clutch B pressure
Main power supply and ground circuit
Overdrive control switch
OD OFF indicator lamp
Shift position indicator circuit
Shift lock system
CVT Control system
CVT Fluid
CVT Shift selector
Control cable
Key interlock cable
TCM
Air breather hose
G Sensor
Oil pan
Primary speed sensor
Secondary speed sensor
Output speed sensor
Differential side oil seal
Water hose
Fluid cooler hose
PLUG
Transmission assembly
Service data and specifications (SDS)
Nissan Versa Sedan Service Manual
Categories
