Nissan Altima (L32) 2007-2012 Service Manual: Hydraulic control system
System Diagram
System Description
The hydraulic control mechanism consists of the oil pump directly driven by the engine, the hydraulic control valve that controls line pressure and transmission, and the input signal line.
LINE PRESSURE AND SECONDARY PRESSURE CONTROL
• When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the TCM controls the line pressure solenoid valve and secondary pressure solenoid valve.
• This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the pressure of the operating oil discharged from the oil pump to the line pressure most appropriate to the driving state. Secondary pressure is controlled by decreasing line pressure.
Normal Control
Optimize the line pressure and secondary pressure, depending on driving conditions, on the basis of the throttle position, the engine speed, the primary pulley (input) revolution speed, the secondary pulley (output) revolution speed, the brake signal, the PNP switch signal, the lock-up signal, the voltage, the target gear ratio, the fluid temperature, and the fluid pressure.
Feedback Control
When controlling the normal fluid pressure or the selected fluid pressure, the secondary pressure can be set more accurately by using the fluid pressure sensor to detect the secondary pressure and controlling the feedback.
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
Mechanical system
Cross-Sectional View
1. Converter housing
2. Driven sprocket
3. Chain
4. Reverse brake
5. Oil pump
6. Forward clutch
7. Planetary carrier
8. Primary pulley
9. Sun gear
10. Steel belt
11. ...
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 ...
Other materials:
P0172 fuel injection system function
DTC Logic
DTC DETECTION LOGIC
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture
ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the
A/F sensors 1. The ECM calculates
the necessary compensation to correct t ...
Trouble diagnosis
Condition of Error Detection
“U1000” or “U1001” is indicated on SELF-DIAG RESULTS on CONSULT-III if CAN
communication signal is
not transmitted or received between units for 2 seconds or more.
CAN COMMUNICATION SYSTEM ERROR
• CAN communication line open (CAN-H, CAN-L, or both)
• ...
ABS 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 terminals and connectors of the ABS actuator and electric unit
(control unit) for damage, bend
and loose connection (unit ...
