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Failure detecting apparatus of a control unit for a vehicle

  • US 4,764,884 A
  • Filed: 05/02/1986
  • Issued: 08/16/1988
  • Est. Priority Date: 05/14/1985
  • Status: Expired due to Term
First Claim
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1. A failure detecting apparatus of a control unit for a vehicle, said apparatus detecting failures of solenoids used to control various functions of the vehicle, comprising:

  • a solenoid driving circuit which selectively supplies currents to said solenoids;

    an input circuit for receiving an output signal as a return signal from each of the solenoids which is in a normal operating state;

    an ignition switch which outputs an engine start signal when it is turned on;

    control circuit means for outputting to said solenoid driving circuit command signals which cause said solenoid driving circuit to supply currents to the solenoids in a predetermined sequence when said start signal is inputted from said ignition switch to said control circuit means, for receiving through said input circuit the return signals from said solenoids supplied with the currents, for determining that any said solenoid which fails to output a return signal in response to the application of current thereto is defective, and for outputting an alarm signal when a defective solenoid is detected; and

    alarm indicating means for indicating the solenoid which is defective in response to said alarm signal from said control circuit.

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