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Home >> Cadillac >> 1993 >> Allante >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P027: Open Throttle Position (TP) Switch Circuit >> Test Conditions

Test Conditions

  1. Codes P021, P022 and P024 are not set.
  2. Vehicle in coast down condition.
  3. Throttle position switch open.
  4. Brake applied.
  5. Throttle position 12 degrees or less.
  6. Engine speed at least 64 RPM greater than desired.
  7. At least 10 seconds have passed between brake applications or the last ISC motor pulse from the PCM.
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