DTC P0403: Exhaust Gas Recirculation (EGR) Control Circuit

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. 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 EGRVR circuit short to VPWR or GND 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 HH: Exhaust Gas Recirculation System Module (ESM) STEP HH21.
Vehicles With an Electric EGR (EEGR)	GO to KD: Electric Exhaust Gas Recirculation (EEGR) System STEP KD1.
All others	GO to HE: Exhaust Gas Recirculation (EGR) Systems STEP HE59.	GO to HE: Exhaust Gas Recirculation (EGR) Systems STEP HE59.	GO to HE: Exhaust Gas Recirculation (EGR) Systems STEP HE64.