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Home › Cadillac › 1993 › Allante › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P090: TCC Brake Switch Input Circuit Problem › Failure Conditions

Failure Conditions

  1. A 2.5 MPH or greater decrease in non-drive wheel speed in 0.2 second.
  2. Transition in the extended travel brake contacts of the torque management brake switch or Stop/BTSI/Cruise brake switch.
  3. No transition noticed in the TCC contacts of the torque management brake switch.
  4. If conditions 1 through 3 are true, increment counter.
  5. When counter reaches 5, set Code P090.
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