High Pressure Exhaust Gas RECIRCULATION Components - EU5/6 Only
The High Pressure (HP) Exhaust Gas Recirculation (EGR) components comprise a HP EGR valve.
The HP EGR valve is located on the left side of the engine and is secured to the intake manifold with bolts.
The HP EGR valve is a solenoid operated valve which is controlled by the Powertrain Control Module (PCM). The PCM uses the HP EGR valve to control the amount of exhaust gas being re-circulated in order to reduce exhaust emissions and combustion noise. The HP EGR is enabled when the engine is at normal operating temperature and under cruising conditions.
The EGR valve receives a 12V supply from the PCM and is controlled using a Pulse Width Modulation (PWM) signal. The PWM duty signal of the solenoid ground is varied to determine the precise amount of exhaust gas delivered to the cylinders.
The HP EGR valve is operated through its full range at each engine shut down, to clear any carbon deposits that may have built up whilst the engine was running.
In the event of a failure of the HP EGR valve, the HP EGR function will become inoperative. The PCM can monitor the HP EGR valve solenoid for short circuits and store Diagnostic Trouble Codes (DTC) in the event of failure. The HP EGR valve can also be activated for testing using the approved diagnostic equipment.