Nissan Maxima Service and Repair Manual: P0744 torque converter
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 malfunctions (circuits open or shorted), but also by mechanical malfunctions such as control valve sticking, improper solenoid valve operation, etc.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION: Always drive vehicle at a safe speed.
NOTE: Immediately after performing any "DTC CONFIRMATION PROCEDURE", always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
1.CHECK DTC DETECTION
With CONSULT
- Turn ignition switch ON.
- Select "Data Monitor" in "TRANSMISSION".
- Start engine and maintain the following condition for at least 30 seconds.
ACC PEDAL OPEN : More than 1.0/8
RANGE : "D" position
VEHICLE SPEED : Constant speed of more than 40 km/h (25 MPH)
With GST
Follow the procedure "With CONSULT".
Diagnosis Procedure
1.CHECK LINE PRESSURE
Perform line pressure test. Refer to TM-162, "Inspection and Judgment".
2.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
- Turn ignition switch OFF.
- Disconnect CVT unit connector.
- Check torque converter clutch solenoid valve. Refer to TM-70, "Component Inspection (Torque Converter Clutch Solenoid Valve)".
3.CHECK LOCK-UP SELECT SOLENOID VALVE
Check lock-up select solenoid valve. Refer to TM-70, "Component Inspection (Lock-up Select Solenoid Valve)".
4.CHECK SECONDARY SPEED SENSOR SYSTEM
Check secondary speed sensor system. Refer to TM-60, "DTC Logic".
5.CHECK PRIMARY SPEED SENSOR SYSTEM
Check primary speed sensor system. Refer to TM-57, "DTC Logic".
6.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Component Inspection (Torque Converter Clutch Solenoid Valve)
1.CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
Check resistance between CVT unit connector terminal and ground.
Component Inspection (Lock-up Select Solenoid Valve)
1.CHECK LOCK-UP SELECT SOLENOID VALVE
Check resistance between CVT unit connector terminal and ground.
P0740 torque converter
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 ...
P0745 pressure control solenoid A
Description
The line pressure solenoid valve regulates the oil pump discharge pressure to
suit the driving condition in
response to a signal sent from the TCM.
DTC Logic
DTC DETECTION LOGIC
...
Other materials:
System temporarily unavailable
Condition A
When the radar sensor picks up interference
from another radar source, making it impossible
to detect a vehicle ahead, the FEB system is
automatically turned off.
The FEB system warning light (orange) will illuminate.
Action to take
When the above conditions no longer exist, ...
Driving the vehicle
Continuously Variable Transmission (CVT)
WARNING
Do not depress the accelerator pedal
while shifting from P (Park) or N (Neutral)
to R (Reverse), D (Drive), or M
(Manual shift mode). Always depress
the brake pedal until shifting is completed.
Failure to do so could cause you
t ...
P0506 ISC system
Description
The ECM controls the engine idle speed to a specified level via the fine
adjustment of the air, which is let into
the intake manifold, by operating the electric throttle control actuator. The
operating of the throttle valve is varied
to allow for optimum control of the engine id ...
Nissan Maxima Owners Manual
- Illustrated table of contents
- Safety-Seats, seat belts and supplemental restraint system
- Instruments and controls
- Pre-driving checks and adjustments
- Monitor, climate, audio, phone and voice recognition systems
- Starting and driving
- In case of emergency
- Appearance and care
- Do-it-yourself
- Maintenance and schedules
- Technical and consumer information
Nissan Maxima Service and Repair Manual
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