DTC P1402: EGR Function: Description

This system cuts and controls vacuum applied to the EGR valve to suit engine operating conditions. This cut-and-control operation is accomplished through the ECM and the EGR Control (EGRC) solenoid valve. When the ECM detects any of the following conditions, current flowing through the solenoid valve is cut. This causes the vacuum to be discharged into the atmosphere. The EGR valve remains closed.

• Low engine coolant temperature.
• Engine starting.
• High-speed engine operation.
• Engine idling.
• Excessively high engine coolant temperature.
• Mass airflow sensor malfunction.
• Low intake air temperature.