Lance is right, for vacuum actuated '95, anyway...
David Z,
that may be true for contour PCM, but in general at least there is a bunch of codes associated with IMRC.
P1512
Intake Manifold Runner Control Stuck Closed.
P1513
Intake Manifold Runner Control Stuck Closed.
P1516
Intake Manifold Runner Control Input Error.
P1517
Intake Manifold Runner Control Input Error.
P1518
Intake Manifold Runner Control fault - Stuck Open.
P1519
Intake Manifold Runner Control Stuck Open.
P1520
Intake Manifold Runner Control circuit fault.
P1519
Intake Manifold Runner Control fault - Stuck Closed.
P1520
Intake Manifold Runner Control fault.
