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P0400 - Exhaust Gas RECIRCULATION (EGR) Flow

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0400 - EXHAUST GAS RECIRCULATION (EGR) FLOW

Description:  The electric exhaust gas recirculation (EEGR) system is monitored once per drive cycle during steady state conditions above 77 km/h (48 mph). The test fails when the powertrain control module (PCM) calculations indicate the EGR flow is less or greater than expected.
Possible Causes: 
  • EEGR valve stuck open or closed
  • Connector to EEGR not seated
  • EEGR motor windings short or open
  • No voltage to the EEGR
  • Harness open or shorted to voltage or ground
  • Vacuum signal to manifold absolute pressure (MAP) restricted or leaking
  • Mass air flow (MAF) sensor signal erroneous
  • Damaged PCM
  • Carbon build up in the EEGR valve seat area
  • One or more sensors is not responding or is out of range
Diagnostic Aids:  All of the following sensors input data to the PCM for correct operation of the EEGR system: cylinder head temperature (CHT) sensor, intake air temperature (IAT) sensor, MAF, throttle position (TP) sensor, MAP sensor. Any DTC relating to these sensors must be resolved prior to addressing this DTC.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST KD .
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