Crankcase ventilation system diagnostic

Details Crankcase ventilation system diagnostic Crankcase ventilation system diagnostic

1996-08-28

1998-08-11

Biegel, Ronald L.

Measuring and testing

Vehicle chassis

Steering

123 4186, G01M 1500

Patent

active

057929491

ABSTRACT:
A positive crankcase ventilation system diagnostic applied in an automotive internal combustion engine with a pressure sensor disposed in the system for continuous sensing of system pressure while the engine is running in a steady state operating condition, with minimum and maximum sensed pressure values stored during each of repeated test periods. Pressure values exceeding a predetermined normal range over at least one test period indicate a leak or restriction condition in the system. Small differences in pressure values over test periods indicate sensor or electrical fault conditions. Fault conditions are logged and are indicated if persistent.

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U.S. application No. 08/740,177, Patel et al., filed Oct. 1996.
U.S. application No. 08/740,178, O'Daniel, Filed Oct. 1996.

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