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Home >> Kia >> 2010 >> Rio SX, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle System >> Description And Operation (A4AF3) >> Hydraulic Control System >> Fail Safe Function

Fail Safe Function

  1. TCM malfunction in 1st or 2nd gear

    CUTTING OFF THE E/C PRESSURE BY E/C VALVE

    FAIL SAFE FUNCTION CHART

    Speed F/C R/C E/C K/D
    1st      
    2nd    
    Fail    
    1. F/C, SR : from 2-3/4-3 shift valve
    2. R/C : from PCV-B
    3. SA : from 1-2 shift valve
      Fig 1: TCM Malfunction In 1st Or 2nd Gear
      G06828905Courtesy of KIA MOTORS AMERICA, INC.
  2. TCM malfunction in 1st or 2nd gear

    If the hydraulic pressure is supplied to E/C and the F/C, SR pressure is delayed

    FAIL SAFE FUNCTION CHART

    Speed F/C R/C E/C K/D
    1st      
    2nd    
    Fail    
    1. R/C, E/C, S/A : interlock
      Fig 2: Identifying TCM Malfunction In 1st Or 2nd Gear
      G06828906Courtesy of KIA MOTORS AMERICA, INC.
      NOTE:
      • SA : Servo Apply pressure
      • F/C : Front Clutch pressure
      • R/C : Rear Clutch pressure
      • K/D : Kick Down
      • SCV : Shift Control Valve
      • CSV : Control Switch Valve
      • PCSV : Pressure Control Solenoid Valve
      • SCSV : Shift Control Solenoid Valve
      • PCV : Pressure Control Valve
      • RCEV : Rear Clutch Exhaust Valve