Exhaust Gas RECIRCULATION (EGR): Notes
EGR is controlled by ECU through a EGR solenoid valve. ECU controls solenoid based upon input signals received from various input components. If EGR system components test okay and system fails to function properly due to ECU control of EGR solenoid, test input signals which ECU uses to determine control of EGR system. See EGR SYSTEM INPUT SIGNALS table.
EGR SYSTEM INPUT SIGNALS
| Signal | Data Usage |
|---|---|
| Coolant (Engine) Temperature Sensor | Engine Temperature |
| Crank Angle Sensor | Engine Speed |
| Ignition Switch | Crank (START) Signal |
| Throttle Position Sensor | Idle Position |
| Throttle (Idle) Switch | Idle Position |