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Home >> Hyundai >> 2007 >> Accent GS, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle System (A4AF3) >> Automatic Transaxle System >> 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 ◦ ◦    
    • F/C, SR: from 2-3/4-3 shift valve
    • R/C: from PCV-B
    • SA: from 1-2 shift valve
      Fig 1: Function Diagram - E/C Releasing Duty Control
      G04802045Courtesy of HYUNDAI MOTOR CO.
  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   ◦   ◦
    • R/C, E/C, S/A: interlock
      Fig 2: Function Diagram - E/C Releasing Duty Control
      G04802045Courtesy of HYUNDAI MOTOR CO.
      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 
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