32 EGR Solenoid Circuit - (P 0403)

32 EGR SOLENOID CIRCUIT - (P 0403)





The Exhaust Gas Recirculation (EGR) solenoid is mounted on the transducer, located at the back of the cylinder head, near the camshaft position sensor. The Powertrain Control Module (PCM) provides a switched ground path to the solenoid through pin 39. When the EGR solenoid is energized, vacuum is blocked from entering the transducer. As the engine warms up, the PCM de-energizes the EGR solenoid, applying vacuum to the back-pressure transducer. The back-pressure transducer controls the amount of vacuum to the EGR valve based upon the back pressure in the exhaust system.

ENABLING CONDITIONS
- Battery voltage must be at least 10 volts
- Ignition voltage must be supplied to the PCM

The MIL illuminates and a DTC is stored when the PCM requests that the EGR solenoid be energized and the voltage at pin 39 is high, or when the PCM requests that the solenoid be de-energized and the voltage at pin 39 is low (open or shorts), for a period of three seconds.

This malfunction could possibly be caused by problems with any of the following components:

- EGR solenoid
- EGR solenoid wiring or related connectors (open or short)
- PCM