System Check - EGR

Results Of Incorrect Operation

With too much EGR flow at idle, cruise, or cold operation, any of the following conditions may occur:

^ The engine stalls after a cold start.

^ The engine stalls at idle after deceleration.

^ The vehicle surges during cruise.

^ The vehicle idles roughly.

If the EGR valve stays open all of the time, the engine may not idle. A DTC P0401 may set. Refer to DTC P0401 EGR System. P0401

Too little or no EGR flow allows the combustion temperatures to get too high during acceleration and load conditions. This could cause the following conditions:

^ Spark knock (detonation)

^ Engine overheating

^ DTC P0401


System Check

The Linear EGR System Check covers the diagnosis of the EGR system. Refer to EGR System Diagnosis.