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Home >> Subaru >> 2004 >> Forester XS, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0705: Transmission Range Sensor Circuit (PRNDL Input)
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DTC P0705: Transmission Range Sensor Circuit (PRNDL Input)

  1. OUTLINE OF DIAGNOSIS 

    Judge NG when the "D" range switch becomes ground short or open circuit.

  2. COMPONENT DESCRIPTION 

    Inhibitor switch ensures the safety at engine start. This switch is installed to the right side of transmission case, and operated by selector lever.

    When the selector lever is in the "P" or "N" range, the engine will start because the electric circuit in inhibitor switch is closed and the starter circuit is connected.

    When the selector lever is in the "R", "D", "3", "2" or "1" range, the electric circuit in inhibitor switch is open; therefore, the engine cannot be cranked.

    In the "R" range, the back-up light will illuminate because the back-up light circuit in the switch is connected.

    In addition to the functions above, the inhibitor switch has the circuit which detects the selected range position at the present and transmits the range signal to the TCM.

  3. ENABLE CONDITION 
    • Enable condition A 
      ENABLE CONDITION A

      Secondary Parameters Enable Conditions
      Shift "N" to "3"
      Vehicle speed "GREATER THAN EQUAL TO" 0 km/h (37 MPH)
    • Enable condition B 
      ENABLE CONDITION B

      Secondary Parameters Enable Conditions
      Engine speed > 500 rpm
      Battery voltage > 10.9 V
  4. GENERAL DRIVING CYCLE 
    • Perform the diagnosis continuously after engine start (Under enable condition A).
    • Perform the diagnosis when shift from "N" to "3" range, at more than 60 km/h (37 MPH) (Under enable condition B).
  5. DIAGNOSTIC METHOD 

    Judgment Value 

    JUDGMENT VALUE

    Malfunction Criteria Threshold Value
    "D" signal continuously (Under enable condition A) Not detected
    Simultaneous signal (Under enable condition B) "GREATER THAN EQUAL TO"

    Time Needed for Diagnosis: 

    • 63.75 seconds (Under enable condition A)
    • 10 seconds (Under enable condition B)

      Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

  6. DTC CLEAR CONDITION 
    • When the OK idling cycle was completed 40 times in a row
    • When "Clear Memory" was performed
  7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION 
    • When the OK driving cycle was completed 3 times in a row
    • When "Clear Memory" was performed
  8. FAIL SAFE 

    None

  9. ECM OPERATION AT DTC SETTING 

    Memorize the freeze frame data. (For test mode $02)