The Automatic Transmission changes the gear position of the transmission utilizing a combination of Clutches and Brakes, which are controlled by solenoid valves. This Automatic Transmission consists of a: LR ( Low and Reverse Brake ), 2-4( 2-4 Brake ), UD ( Under Drive Clutch ), OD ( Over Drive Clutch ), REV ( Reverse Clutch ).
The PCM/TCM checks the Low and Reverse 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 PCM/TCM judges that the Low and Reverse control solenoid circuit is malfunctioning and sets this code.
Item
Detecting Condition
Possible Cause
Case 1
DTC Strategy
Electrical Check
Open or short in circuit
Faulty ON/OFF SOLENOID VALVE
Faulty PCM/TCM
Enable Conditions
PWM DUTY > 25%
Threshold Value
Comparision solenoid operation time with Feed back signal.(Solenoid ON and Short circuit)
Case 2
-
Comparision solenoid operation time with Feed back signal.(Solenoid OFF and Short circuit)
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 O(25?)
Fig 1) Wave form of "ON/OFF(SCSV-A)"