Method of diagnosing a low range limiting malfunction of an...

Details Method of diagnosing a low range limiting malfunction of an... Method of diagnosing a low range limiting malfunction of an...

2007-04-10

2007-04-10

Raymond, Edward (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Temperature measuring system

C374S100000

Reexamination Certificate

active

11234408

ABSTRACT:
Low range limiting malfunctions of an engine coolant temperature (ECT) sensor are diagnosed by comparing a change in the sensed temperature during engine operation with a calibrated temperature change. If the change in sensed temperature fails to exceed the calibrated temperature change, and a diagnostic for detecting a stuck ECT signal is either inconclusive or passed, a low range limiting malfunction of the sensor is indicated. If the diagnostic for detecting a stuck ECT signal is failed, the low range limiting diagnostic concludes with no report even if the change in sensed temperature fails to exceed the calibrated temperature change.

REFERENCES:
patent: 4069712 (1978-01-01), Armstrong et al.
patent: 5792949 (1998-08-01), Hewelt et al.
patent: 6240774 (2001-06-01), Niki et al.
patent: 2004/0173012 (2004-09-01), Tsukamoto et al.
patent: 2004/0232252 (2004-11-01), Paul et al.

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