Nissan Altima (L32) 2007-2012 Service Manual: Lock-up and select control system
System Diagram
System Description
• The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to increase power transmission efficiency.
• The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid valve, which is controlled by a signal from TCM. The torque converter clutch control valve engages or releases the torque converter clutch piston.
• When shifting between “N” (“P”) ⇔“D” (“R”), torque converter clutch solenoid controls engagement power of forward clutch and reverse brake.
• The lock-up applied gear range was expanded by locking up the torque converter at a lower vehicle speed than conventional CVT models.
TORQUE CONVERTER CLUTCH AND SELECT CONTROL VALVE CONTROL
Lock-up Released
In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the torque converter clutch solenoid and the lock-up apply pressure is drained.
In this way, the torque converter clutch piston is not coupled.
Lock-up Applied
In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque converter clutch solenoid and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.
Select Control
When shifting between “N” (“P”) ⇔“D” (“R”), optimize the operating pressure on the basis of the throttle position, the engine speed, and the secondary pulley (output) revolution speed to lessen the shift shock.
Component Parts Location - Coupe
1. Control device assembly
2. Accelerator pedal position sensor
3. CVT unit harness connector
4. Primary speed sensor
5. Secondary speed sensor
6. PNP switch
7. TCM
8. Battery
9. Shift position indicator Manual mode indicator
Component Parts Location - Sedan
1. Control device assembly
2. Accelerator pedal position sensor
3. CVT unit harness connector
4. Primary speed sensor
5. Secondary speed sensor
6. PNP switch
7. TCM
8. Battery
9. Shift position indicator Manual mode indicator
Component Description
TRANSAXLE ASSEMBLY
EXCEPT TRANSAXLE ASSEMBLY
Control system
System Diagram
System Description
The CVT senses vehicle operating conditions through various sensors. It
always controls the optimum shift
position and reduces shifting and lock-up shocks.
T ...
Shift mechanism
System Diagram
NOTE:
The gear ratio is set for every position separately.
System Description
In order to select the gear ratio which can obtain the driving force in
accordance with driver's ...
Other materials:
Service data and specifications
(SDS)
Standard and Limit
GENERAL SPECIFICATIONS
DRIVE BELTS
CYLINDER HEAD
* Approximately 80°C (176°F)
Available Valve Lifter
Valve Spring
CAMSHAFT AND CAMSHAFT BEARING
CYLINDER BLOCK
PISTON, PISTON RING, AND PISTON PIN
Available Piston
Piston Ring
CONNECT ...
Power consumption control system
System Diagram
System Description
OUTLINE
• BCM incorporates a power saving control function that reduces the power
consumption according to the
vehicle status.
• BCM switches the status (control mode) by itself with the power saving control
function. It performs the sleep
request ...
ECM branch line circuit
Diagnosis Procedure
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose
connection (unit side and connector
side).
- ECM
- Harnes ...
