Gm Global Technolgoy Operations, Inc.

Sandra J Nelson

Joseph M Stempnik

Tracey A Bagley-Reed

Paul Alan Bauerle

Richard B Jess

Mark Henry Costin

Daniel P Grenn

Ronald W Van Diepen

Michael A Turley

Bryan D Lehman

Debbie L Makowske

A control system comprising a powertrain relay diagnostic module that determines a single continuous period that a powertrain relay voltage is less than an ignition relay voltage, that compares the single continuous period to a single predetermined period, and that diagnoses a powertrain relay out of correlation (OOC) error when the single continuous period is greater than or equal to the single predetermined period, and an ignition relay diagnostic module that diagnoses an ignition relay OOC error when the ignition relay voltage is less than the powertrain relay voltage for a first predetermined cumulative period within a first predetermined total period.

Powertrain and ignition diagnostic system and method

A vehicle speed module includes a speed arbitration module that receives at least two of a wheel speed, a transmission output speed (TOS), and an electric motor speed (EMS), and that determines a vehicle speed based on a comparison of the at least two of the wheel speed, the TOS, and the EMS. A speed diagnostic module selectively diagnoses a fault in one of a wheel speed sensor, a TOS sensor, and an EMS sensor based on the comparison.

Securing and diagnosing the vehicle speed input and direction for torque control systems

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Howell, MI, United States of America

Sandra J Nelson