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DTC P1520: Intake Manifold Runner Control (IMRC) 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.
P1520 - INTAKE MANIFOLD RUNNER CONTROL (IMRC) CIRCUIT

Description:  This DTC indicates a failure in the IMRC primary control circuit.
Possible Causes: 
  • IMRC control circuit open
Diagnostic Aids:  An intake manifold runner control monitor (IMRCM) PID reading near 1 volt or greater with an engine speed of at least 3, 000 RPM may indicate a fault.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to HU: Intake Air Systems STEP HU14.