On-Board Diagnostics
DESCRIPTIONThe Diagnosis system is divided into three specialized diagnosises: Key On Engine OFF Diagnosis, Engine Running Diagnosis, and Continuous Diagnosis. The Diagnosis is not a conclusive diagnosis by itself, but is used as a part of the functional Quick-Test diagnostic procedure. The PCM stores the Diagnosis program in its permanent memory. When activated it checks the EEC system by testing its memory integrity and processing capability, and verifies that various sensors and actuators are connected and operating properly.
The Key On Engine Off and Engine Running Diagnosises are functional diagnosises which only detect faults present at the time of the Diagnosis. Continuous Diagnosis is performed during normal vehicle operation and stores any fault information in Keep Alive Memory (KAM) for retrieval at a later time.
SPECIAL SERVICE TOOLS