Variable Foced Solenoid (Linear Solenoid) : The amount of oil flow is determined by current signal for maintaining constant line pressure. 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 | |
Case 1 | DTC Strategy |
•
Electrical Check |
•
Open or short in circuit
•
Faulty VF SOLENOID VALVE
•
Faulty PCM/TCM |
Enable Conditions |
•
VFS current < 0.05A | ||
Threshold Value |
•
Comparision solenoid operation time with Feed back signal.(Open circuit or short to ground) | ||
Case 2 | Enable Conditions |
•
VFS current > 1A | |
Threshold Value |
•
Comparision solenoid operation time with Feed back signal.(Short to battery) | ||
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℃
Voltage/Current : 5V, 1.2 A Max.
Internal resistance : 3.5 ± 0.2 Ω(25℃)
Fig 1) Wave form of "VFS"
