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Home >> Cadillac >> 1995 >> Eldorado Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Parameters >> Pcm Specific Override Codes >> PS21: Knock Sensor Test
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PS21: Knock Sensor Test

  1. Test conditions are transaxle in 4th gear, throttle angle at greater than 33.6 degrees and coolant temperature at greater than 80°C. When PS21 is selected, display will alternate between "--" for one second and "99" for 5 seconds.
  2. If COOLER button is depressed and held down, display will change to "00" and TCC will engage and spark advance will jump up to 21 degrees and stay there for about 7.4 seconds.
  3. If knock sensor activity is detected anytime during the test, display will change to "11" and the test is suspended. If end of test is reached and no knock sensor activity was detected, display will change to "22".
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