Exhaust Gas RECIRCULATION Cooler Bypass Valve
| ITEM | DESCRIPTION |
|---|---|
| 1 | Exhaust Gas Recirculation (EGR) bypass valve vacuum actuator |
| 2 | EGR valve motor |
| 3 | EGR valve |
| 4 | EGR bypass valve |
Each valve housing contains an Exhaust Gas Recirculation (EGR) bypass valve. The EGR bypass valve allows the exhaust gasses to flow direct to the electric throttle or diverts them through the EGR cooler.
A vacuum actuator is located on a bracket attached to each EGR cooler to operate the cooler bypass valves. The actuators receive a vacuum which is produced by the vacuum pump located at the rear of the engine. Each vacuum actuator is connected to its related bypass valve by an actuator rod.
The vacuum supply to the actuators is controlled by the Powertrain Control Module (PCM). When bypass control is required, the PCM energizes an EGR bypass valve solenoid, which applies vacuum to the vacuum actuators. The vacuum causes the actuators to move the connecting rods in a linear direction. The linear movement of the rods is transferred to rotary movement of the EGR bypass valves within the valve housings.