Left Side Exhaust Gas RECIRCULATION Low Pressure Components
| ITEM | DESCRIPTION |
|---|---|
| 1 | Exhaust Gas Recirculation (EGR) valve motor |
| 2 | EGR outlet temperature sensor |
| 3 | Coolant inlet connection |
| 4 | Differential pressure sensor - Low Pressure (LP) EGR |
| 5 | Exhaust gas inlet from Post-Diesel Particulate Filter (DPF) |
| 6 | Cooler |
| 7 | LP EGR valve housing |
| 8 | Coolant outlet connection |
| 9 | Exhaust gas outlet to clean air duct |
The left side Low Pressure (LP) Exhaust Gas Recirculation (EGR) valve and LP EGR cooler are located on the left side of the engine. The EGR cooler is secured to a bracket on the intake manifold with two bolts and to the bank two cylinder head with one bolt.
The LP EGR valve is a solenoid operated valve which is controlled by the Powertrain Control Module (PCM). The PCM uses the LP EGR valve to control the amount of exhaust gas being re-circulated from the catalytic converter and Diesel Particulate Filter (DPF) assembly in order to further reduce exhaust emissions. The LP EGR valve is enabled when the engine is at normal operating temperature and under cruising conditions.
In the event of a failure of the LP EGR valve, the LP EGR function will become inoperative. The PCM can monitor the LP EGR valve solenoid for short circuits and store fault codes in the event of failure. The LP EGR valve can also be activated for testing using an approved diagnostic system.
For additional information, Refer to: ENGINE EMISSION CONTROL
Differential Pressure Sensor - Low Pressure Exhaust Gas Recirculation
The LP EGR differential pressure sensor is attached to a bracket which is attached to the LP EGR valve. The sensor is secured to the bracket with a screw.
The LP EGR differential pressure sensor is used by the PCM to monitor exhaust gas passing into the LP EGR cooler. The PCM compares it with exhaust gas/clean air passing though the LP EGR valve into the turbocharger.