System for diagnosing an internal combustion engine

Measuring and testing – Vehicle chassis – Steering

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340 52F, G01M 1500

Patent

active

045466467

ABSTRACT:
A system for diagnosing operations of sensing systems of an internal combustion engine. The system comprises a first diagnosing circuit for diagnosing operation of an important system, such as a coolant temperature sensor, the first diagnosing circuit including a comparator for comparing an input from the sensing system with a reference range and for producing an output when the input is out of the range. A display is provided responsive to the output of the first diagnosing circuit indicating trouble in the sensing system, and a second diagnosing circuit is provided for diagnosing operation of a minor sensing system and for producing an output when the input from the sensing system is abnormal. A gate is provided for electrically connecting the output of the second diagnosing circuit with the display. A manually operated control circuit is provided for operating the gate so as to display the result of the diagnosing of the second diagnosing circuit.

REFERENCES:
patent: 3938075 (1975-02-01), Reddy
patent: 4001776 (1977-01-01), Carol, Jr. et al.
patent: 4219798 (1980-08-01), Frister
patent: 4244340 (1981-01-01), Herth et al.
patent: 4246566 (1981-01-01), Endo et al.

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