DTC P0403: Exhaust Gas RECIRCULATION (EGR) Control Circuit

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2006 Mercury Mountaineer, 2006 Mercury Monterey, 2006 Mercury Montego, 2006 Mercury Mariner, and 2006 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

P0403 - EXHAUST GAS RECIRCULATION (EGR) CONTROL CIRCUIT

For Vehicles With an Electric EGR (EEGR)
Description:	The EEGR system is continuously monitored to check the 4 EEGR motor coils, circuits, and the powertrain control module (PCM) for opens, shorts to voltage and ground. If a malfunction is detected the EEGR system is disabled and additional monitoring is suspended for the remainder of the drive until the next drive cycle.
Possible Causes:	EEGR motor windings open Connector to EEGR not seated Open circuit in the harness from the PCM to the EEGR Short circuit in the EEGR motor Short circuit in the harness from the PCM to the EEGR Damaged PCM
Diagnostic Aids :
For All Others
Description:	This test checks the electrical function of the EGR vacuum regulator (EGRVR) solenoid. The test fails when the EGRVR circuit voltage is either too high or too low when compared to the expected voltage range. The EGR system must be enabled for the test to be completed.
Possible Causes:	EGRVR circuit open VPWR open to EGRVR solenoid EVR circuit short to voltage or ground Damaged EGRVR solenoid Damaged powertrain control module (PCM)
Diagnostic Aids:	The EGRVR solenoid resistance is between 26 and 40 ohms.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Vehicles with an EGR system module (ESM)	GO to Pinpoint Test HH .
Vehicles With an Electric EGR (EEGR)	GO to Pinpoint Test KD .
All others	GO to Pinpoint Test HE .