Possible causes

– Intake Manifold Runner Control (IMRC) harness is open or shorted
– Intake Manifold Runner Control (IMRC) circuit poor electrical connection
– Faulty Intake Manifold Runner Control (IMRC) actuator
– Faulty Engine Control Module (ECM)

When is the code detected?

The Engine Control Module (ECM) has detected a shorted or open condition in the Intake Manifold Runner Control (IMRC) circuit

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1520 MERCURY Description

The Intake Manifold Runner Control (IMRC) is monitored for failure during continuous or key ON engine OFF self-test.