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Home >> Subaru >> 2004 >> Forester XT, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P1301: Misfire Detected (High Temperature Exhaust Gas)

DTC P1301: Misfire Detected (High Temperature Exhaust Gas)

  1. OUTLINE OF DIAGNOSIS 

    Detect whether the misfire occurred or not. (Exhaust temperature method)

    Judge NG when the exhaust temperature is high.

  2. ENABLE CONDITION 
    ENABLE CONDITION CHART

    Secondary Parameters Enable Conditions
    Time for keep completing all secondary parameters. 1 second or more
    Intake manifold pressure change during 0.5 engine rev. < 16.0 kPa (120 mmHg, 4.72 inHg) (MT) < 14.7 kPa (110 mmHg, 4.33 inHg (AT)
    Engine speed change < 500 rpm/32 milliseconds
    Throttle position change during 16 milliseconds < 10°
    Fuel shut-off function Not operating
    Atmospheric pressure "GREATER THAN EQUAL TO" 75.1 kPa (563 mmHg, 22.2 inHg)
    Fuel level "GREATER THAN EQUAL TO" 9 l (2.38 US gal, 1.98 lmp gal)
    Air condition No switching ON <-- --> OFF
    Radiator fan No switching ON <-- --> OFF
    Power steering switch No switching ON <-- --> OFF
    Starter ON, or OFF, or change from ON to OFF
    Evaporative system leak check Not in operation
    Engine speed 500 - 7000 rpm
    Intake manifold pressure > Map 3 or more
    Battery voltage "GREATER THAN EQUAL TO" 8V
    Engine coolant temperature "LESS THAN EQUAL TO" 111°C (232°F)
    Intake air temprature "LESS THAN EQUAL TO" 101°C (214°F)
    Judgement of heavy fuel Not judged
    VDC and AT control Not during the torque controlling

    Map3 

    • MT model 

      Vehicle Speed <64.4 km/h (40 MPH) 

      VEHICLE SPEED CHART

      rpm 700 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 6700
      kPa (mmHg, inHg) 25.1 (188, 7.40) 24.8 (186, 7.32) 25.6 (192, 7.56) 23.3 (175, 6.89) 26.3 (197, 7.76) 25.9 (194, 7.64) 28.9 (216.5, 8.52) 30.0 (225, 8.86) 31.7 (237.5, 9.35) 33.0 (248, 9.76) 37.1 (278.5, 11.0) 41.9 (314, 12.4) 47.0 (352.5, 13.9) 51.1 (383, 15.1)

      Vehicle Speed "GREATER THAN EQUAL TO" 64.4 km/h (40 MPH) 

      VEHICLE SPEED CHART

      rpm 700 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 6700
      kPa (mmHg, inHg) 25.5 (191, 7.52) 25.1 (188, 7.40) 30.4 (227.7, 8.96) 35.6 (267.4, 10.5) 38.5 (288.9, 11.4) 40.4 (302.9, 11.9) 41.1 (308.6, 12.1) 40.8 (306, 12.0) 44.8 (335.8, 13.2) 47.3 (354.5, 14.0) 49.1 (368.2, 14.5) 50.9 (381.9, 15.0) 52.8 (396, 15.6) 52.8 (396, 15.6)
    • AT model 
      VEHICLE SPEED CHART

      rpm 700 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 6700
      kPa (mmHg, inHg) 26.3 (197, 7.76) 24.8 (186, 7.32) 23.6 (177, 6.97) 25.5 (191, 7.52) 27.3 (205, 8.07) 26.1 (196, 7.72) 29.5 (221.5, 8.72) 31.3 (235, 9.25) 32.7 (245.5, 9.67) 33.3 (250, 9.84) 38.2 (286.5, 11.28) 33.6 (252.3, 9.93) 49.5 (371.5, 14.63) 51.5 (386, 15.20)
  3. GENERAL DRIVING CYCLE 
    • Detecting misfire is carried out in the condition between idling and high revolution.
    • Perform the diagnosis continuously.
  4. DIAGNOSTIC METHOD 

    Judge NG when the malfunction criteria below continue 200 engine revs. (400 ignitions) in a row.

    Judgment Value 

    JUDGMENT VALUE CHART

    Malfunction Criteria Threshold Value
    Exhaust temperature > 1050°C (1922°F)

    Time Needed for Diagnosis:  200 engine revs.

    Malfunction Indicator Light Illumination:  Illuminates as soon as malfunction occurs.

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

    None

  8. ECM OPERATION AT DTC SETTING 

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

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