Exhaust Gas RECIRCULATION (EGR): Notes
PCM cuts and controls vacuum applied to EGR valve depending upon engine operating conditions. On Q45 (except Ca.) and I30, this is achieved by PCM control of the EGRC solenoid valve. See Fig 1 . On Q45 (Ca.), this is achieved by PCM control of EGR valve and EVAP canister purge control solenoid valve. See Fig 2 . On all models, when the following conditions are detected, PCM will discharge vacuum signal to EGR valve into the atmosphere based upon input signals received from various input components. See EGR SYSTEM INPUT SIGNALS table.
- Low engine coolant temperature.
- When engine is started or engine is idling.
- Excessively high engine coolant temperature.
- Mass Air Flow (MAF) sensor malfunction.
- When Traction Control System (TCS) is operating (if equipped).
EGR SYSTEM INPUT SIGNALS
| Signal | Data |
|---|---|
| Closed Throttle Position Switch | Idle Position |
| EGR Temperature Sensor | Exhaust Gas Temperature |
| Engine Coolant Temperature Sensor | Engine Temperature |
| Crankshaft Position Sensor | Engine Speed |
| Ignition Switch | Crank (START) Signal |
| Throttle Position Sensor | Idle Position |
| Vehicle Speed Sensor (VSS) | Vehicle Speed |