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 2-4 SOLENOID VALVE 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 2nd Brake drive contorl 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 2-4 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 | DTC Strategy |
•
- | |
Enable Conditions |
•
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℃
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 "PCSV-B(2-4SOLENOID VALVE)"
