The Automatic Transmission changes the gear position of the transmission by utilizing a combination of Clutches and Brakes, which are controlled by solenoid valves. The New Alpha Automatic Transmission consists of a: LR (Low and Reverse Brake), KD (Kick Down Brake), FC (Front Clutch), RC (Rear Clutch), and EC (End Clutch). The gear position is determined by the combination of 3 kinds of Shift Control Solenoid Valves. ( SCSV A , SCSV B, SCSV C )
The TCM checks the Shift Control Solenoin Valve B 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 SCSV B contorl solenoid circuit is malfunctioning and sets this code.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Check voltage range
? Open or short in circuit
? Faulty SCSV-B
? Faulty PCM/TCM
Enable Conditions
? 25% < Solenoid duty < 100%
? Timer of PWM monitoring > 0.5sec
? 8V < Voltage of Battery <16V
Threshold Value
Diagnostic Time
? More than 300 ms
Fail Safe
? Locked in 3 rd gear.