Exhaust Gas Recirculation: Description and Operation

SYSTEM DESCRIPTION
This system cuts and controls vacuum applied to the EVAP canister (for non-California models) and the EGR valve to suit engine operating conditions. This cut-and-control operation is accomplished through the ECM and the EGRC-solenoid valve*. When the ECM detects any of the following conditions, current flows through the solenoid valve. This causes the port vacuum to be discharged into the atmosphere. The EVAP canister (for non-California models) and the EGR valve remain closed.

- Low engine coolant temperature
- Engine starting
- Engine stopped
- Engine idling
- Excessively high engine coolant temperature
- Mass air flow sensor malfunction
- Low vehicle speed (for non-California models)

*: Only for California models. For non-California models, this means EGR valve & canister control solenoid valve.