EGR Fault Detection System

An EGR malfunction detection system is incorporated into the TCCS system to warn the driver when the EGR system is not operating properly. The system uses an Exhaust Gas Temperature (THG) sensor on the intake side of the EGR valve where it is exposed to exhaust gas flow whenever the EGR valve opens.

The ECM compares the THG signal with parameters stored in memory. If EGR gas temperature is determined to be too cold when the ECM has the EGR valve enabled, the MIL will be illuminated, and a diagnostic code will be stored in ECM memory. This diagnostic configuration allows the ECM to monitor entire EGR system operation.

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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