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Home >> Kia >> 2005 >> Sorento EX, RWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle System >> Sub ROM Unit

Sub ROM Unit

  1. Installing location: The valve body upper part
  2. Function: To obtain A/T fluid pressure stability by compensating for solenoid & valve body unit fluid pressure differential.
  3. Principle: Install additional ROM onto valve body of automatic transmission and input fluid pressure differential of solenoid & valve body so that TCM reads the input data to perform fluid pressure compensation.
    Fig 1: Identifying SUB ROM Unit
    G03877500Courtesy of KIA MOTORS AMERICA, INC.
    Fig 2: Fluid Pressure Tester System Diagram
    G03877501Courtesy of KIA MOTORS AMERICA, INC.
  4. Maintenance
    1. When replacing with a new TCM in the vehicle
      • TCM automatically reads SUB ROM DATA during I.G ON. At this time, shift range valve is off for about 2.5 second.
    2. When replacing A/T (regardless of new or old ones) in the vehicle
      • Must erase SUB ROM DATA stored in TCM.
      • Erase SUB ROM DATA in SCAN TOOL delete mode during shift stage in R-range + accelerator opening angle maintains 50% + I.G ON.
      • TCM reads SUB ROM DATA from a new A/T upon I.G ON again after IGG OFF.
    3. Moving TCM from vehicle A to another vehicle B
      • Perform the same way as in 2) above.
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