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Method for diagnosing a failure of an output shaft speed sensor of an automatic transmission for a vehicle

  • US 20030171861A1
  • Filed: 12/27/2002
  • Published: 09/11/2003
  • Est. Priority Date: 03/11/2002
  • Status: Active Grant
First Claim
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1. A method for diagnosing a failure of an output shaft speed sensor of an automatic transmission, comprising:

  • determining whether the transmission is in a forward gear;

    determining whether a failure criterion exists based on at least one of a current gear, an input shaft speed, an output shaft speed, or an engine speed, if the transmission is in a forward gear; and

    maintaining the current gear if a downshift criterion exists, or upshifting a gear if an upshift criterion exists, if the failure criterion exists.

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