Automatic transmission solenoids Nissan Bluebird Sylphy
4-speed automatic transmission (RE4F03B)
* Linear Pressure Control Solenoid (EPC)
* 1st-2nd gear shift solenoid (S1)
* 2-3 gear shift solenoid (S2)
* Torque Converter Lock Shift Solenoid (TCC)
5-speed automatic transmission (RE5F01A)
* Linear Pressure Control Solenoid (EPC)
* 1st-2nd gear shift solenoid (S1)
* 2-3 gear shift solenoid (S2)
* 3-4 gear shift solenoid (S3)
* 4-5 gear shift solenoid (S4)
* Torque Converter Lock Shift Solenoid (TCC)
Solenoid Location
The solenoids are located on the valve body inside the automatic transmission housing.
Solenoid functions
* Linear Pressure Control (EPC) solenoid regulates hydraulic fluid pressure in the transmission system.
* Shift solenoids (S1-S4) control the engagement and disengagement of the various clutch packs that provide gear shifting.
* The Torque Converter Lockup Shift Solenoid (TCC) controls torque converter lockup, minimizing power loss and increasing transmission efficiency.
Signs of Solenoid Failure
* Jerks or slipping when changing gears
* Delay in gear shifting
*Poor acceleration or rough shifting
* Torque converter lockup problems
Diagnosis of solenoids faults
Faulty solenoids are diagnosed using a diagnostic code scanner (OBD II), which reads trouble codes and helps determine which solenoid is faulty.
Replacing solenoids
Replacing solenoids requires removing the automatic transmission housing and valve body. This is a complex repair that is best left to a qualified mechanic.
Solenoid Maintenance
Automatic transmission solenoids do not require regular maintenance, but it is recommended to periodically flush the transmission fluid and replace the automatic transmission filter to prevent contamination and ensure proper operation.