Engine Diagnosis General Description

Engine Diagnosis General Description

The engine and emission control systems in this vehicle are controlled by ECM. ECM has an OBD (On-Board Diagnostic) system which detects a malfunction in this system and abnormality of those parts that influence the engine exhaust emission. When diagnosing engine troubles, be sure to have full understanding of the outline of OBD (On-Board Diagnostic) System Description OBD (On-Board Diagnostic) System Description
and each item in Precautions for Diagnosing Trouble Precautions for Diagnosing Trouble
and execute diagnosis according to Engine and Emission Control System Check Engine and Emission Control System Check.

There is a close relationship between the emission system, engine mechanical, engine cooling system, ignition system, exhaust system, etc. in their structure and operation. In case of an engine trouble, even when the MIL (Malfunction Indicator Lamp) doesn't turn on, it should be diagnosed according to Engine and Emission Control System Check Engine and Emission Control System Check.