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 gear position is determined by the combination of 2 kinds of Shift Control Solenoid Valves. ( SCSV A , SCSV B )
The PCM/TCM checks the Shift Control Solenoin Valve A 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 A control solenoid circuit is malfunctioning and sets this code.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Monitoring voltage range.
? open or short in circuit.
? Faulty SCSV-A
? Faulty TCM
Enable Conditions
? Always.
Threshold Value
Short to ground
? When "ON" signal output from "solenoid valve" and the Monitoring "OFF" signal is detected for 0.3 second.
Open,short to B+
? When "OFF" signal output from "solenoid valve" and the Monitoring "ON" signal is detected for 0.5 second.
Diagnostic Time
? More than 300 ms
? More than 500 ms ??
Fail Safe
? Gear position is fixed at 3rd or 4th gear.