Variable Foced Solenoid (Linear Solenoid) : With the duty control which uses higher frequency(600Hz), instead of the existing PWM type which adapts low frequency(60Hz) to control,spool valve can be conrolled precisely.
In PWM control,the amount of oil flow is determined by the duration of "ON"signal among continuously repeated ON/OFF signals.
In VFS, the amount is decided by how widely spool valve open the passage of going through.
The TCM checks the VFS Control Signal by monitoring the feedback signal from the solenoid valve drive circuit. If an unexpected signal is monitored (for example, high voltage is detected when low voltage is expected, or low voltage is detected when high voltage is expected), the TCM judges that the Low and Reverse control solenoid circuit is malfunctioning and sets this code.
Item | Detecting Condition & Limp Home | Possible Cause |
DTC Strategy |
•
Check feed back period |
•
Open or short in circuit
•
Faulty VF SOLENOID VALVE
•
Faulty PCM/TCM |
Enable Conditions |
•
16V > Actuator(TCU) power supply voltage >10V | |
Threshold Value |
•
Circuit open or short to ground | |
Diagnostic Time |
•
More than 1sec. | |
Fail Safe |
•
Locked in 3 rd gear. |
Solenoid Valve for Pressure Control
Sensor type : Normal open 3-way
Operating temperature : -30℃∼130℃
Frequency :PCSV-A,B,C,D :50Hz (at the ATF temp. -20℃ above)
VFS : 400~1000
※ KM series : 35Hz
Internal resistance : 3.5 ± 0.2 Ω(20℃)
Surge voltage : 56 V
Fig 1) Wave form of "VFS"
