DTC P0068: Manifold Pressure Sensor Range/Performance

Detect the malfunction of intake manifold pressure sensor output property.

Judge NG when the intake manifold pressure is small (voltage is low) regardless of the driving situation that the intake manifold pressure may be thought larger than engine speed and throttle opening. (Low side) On the other hand, judge NG when the intake manifold pressure is large (voltage is high) regardless of the driving situation that the intake manifold pressure may be thought smaller than engine speed and throttle opening. (High side)

Perform the diagnosis continuously after idling.

• Abnormality Judgment 

  Judge NG when the continuous time of completing all the malfunction criteria of Low side or High side below becomes more than the time (3 seconds) needed for diagnosis.

  Judgment Value 

  JUDGMENT VALUE (ABNORMALITY JUDGMENT)
  
  

  Malfunction Criteria	Threshold Value
  (Low side) Engine speed Throttle position Output voltage	> 2,500 rpm > 15° "LESS THAN EQUAL TO" 0.985 V
  (High side) Engine speed Throttle position Output voltage	600 <---> 900 rpm "LESS THAN EQUAL TO" 2° > 2.81 V

  Time Needed for Diagnosis:  3 seconds

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

• Normality Judgment 

  Judge OK and clear the NG when all the malfunction criteria of Low side or High side are completed.

  Judgment Value 

  JUDGMENT VALUE (NORMALITY JUDGMENT)
  
  

  Malfunction Criteria	Threshold Value
  (Low side) Engine speed Throttle position Output voltage	> 2,500 rpm > 15° > 0.985 V
  (High side) Engine speed Throttle position Output voltage	600 <--> 900 rpm "LESS THAN EQUAL TO" 2° "LESS THAN EQUAL TO" 2.81 V

• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" was performed

• When the OK driving cycle is completed 3 times in a row
• When "Clear Memory" was performed

None

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