Component Location
Description
1. General Description
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 HIVEC Automatic Transmission consists of a: LR ( Low and Reverse Brake ), 2ND ( 2nd Brake ), UD ( Under Drive Clutch ), OD ( Over Drive Clutch ), REV ( Reverse Clutch ), and a RED ( Reduction Brake, only for 5 speed transmissions). The LR Brake is engaged in the 1st gear and reverse gear positions.
2. DTC Description
The 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 TCM judges that the Low and Reverse control solenoid circuit is malfunctioning and sets this code.
DTC Detecting Condition
Item | Detecting Condition & Limp Home | Possible Cause |
DTC Strategy | ? Circuit continuity-open,ground | ? Open or short in circuit ? Defective LR SOLENOID VALVE ? Defective TCM |
Enable Conditions | ? Shift status in-gear Voltage of Battery >10V |
Threshold Value | ? Voltage <3V |
Diagnostic Time | ? More than 320 ms |
Fail Safe | ? Locked in 3 rd gear.(control relay off) |
Specification
Solenoid Valve for Pressure Control
Sensor type : Normal open 3-way |
Operating temperature : -30?~130? |
Frequency : LR, 2ND, UD, OD, RED : 61.27Hz (at the ATF temp. -20? above) |
DCC : 30.64Hz |
KM series : 35Hz |
Internal resistance : 3.0O(20?) |
Surge voltage : 56 V |
Schematic Diagram