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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the intake manifold runner control (IMRC) solenoid from the intake manifold, with the electrical connector connected.
  2. Ignition ON, command the IMRC solenoid ON and OFF with a scan tool. Verify that the IMRC solenoid operates in both directions.
    • If the IMRC solenoid does not operate in both directions, replace the IMRC solenoid.
  3. Inspect the inside of the intake manifold for the following conditions:
    • Carbon build-up that limits the movement of the IMRC valve
    • Casting flash that limits the movement of the IMRC valve
    • Foreign material that limits the movement of the IMRC valve
    • If a condition is found, repair as necessary.
  4. Clean or replace the upper intake manifold.
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