Selfdiagnostic Systems

Engine Control Module (ECM) is equipped with a self-diagnostic system. By analyzing various input signals, ECM detects system malfunctions related to various operating parameters. When malfunction of various engine sensors, switches or circuits occurs, a Diagnostic Trouble Code (DTC) may be stored in the ECM memory. DTC may be retrieved for system diagnosis. For additional information on self-diagnostic system, see TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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