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HOMESERVICE MANUALSFORD2018TRANSIT CONNECT XL, VAN CARGOREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - DESCRIPTION & OPERATION (EXCEPT DIESEL & HYBRID)INTAKE AIR SYSTEMSINTAKE MANIFOLD RUNNER CONTROL (IMRC) SYSTEM
2018 Ford Transit Connect XL, Van Cargo

Intake Manifold Runner Control (IMRC) System

2018 Ford Transit Connect XL, Van CargoSECTION Intake Manifold Runner Control (IMRC) System
WARNING: SUBSTANTIAL OPENING AND CLOSING TORQUE IS APPLIED BY THIS SYSTEM. TO PREVENT INJURY, BE CAREFUL TO KEEP FINGERS AWAY FROM LEVER MECHANISMS WHEN ACTUATED. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

The IMRC system consists of a manifold mounted vacuum actuator and a PCM controlled electric solenoid. For additional information on IMRC vacuum actuated components, refer to ENGINE CONTROL COMPONENTS . The linkage from the actuator attaches to the manifold plate lever. The IMRC vacuum actuator and manifold has a single intake air passage for each cylinder. The passage has a valve plate that blocks a large percentage of the opening when actuated, leaving the top of the passage open to generate turbulence.

The housing uses a return spring to hold the valve plates open. The IMRC sensors provide feedback to the PCM indicating the valve plate position.

  1. The PCM monitors the TP sensor, cylinder head temperature (CHT) sensor, and CKP sensor signals to determine activation of the IMRC system. There must be a positive change in voltage from the TP sensor along with the increase in RPM at the correct engine temperature to open the IMRC valve plates.
  2. The PCM uses the information from the input signals to control the IMRC solenoid based upon changes in the throttle position, the engine temperature, and the RPM.
  3. The PCM energizes the IMRC solenoid with the ignition ON and the engine running. Vacuum is then applied to the actuator to pull the valve plates closed.
Fig 1: IMRC Vacuum Actuated System Flow Diagram
G06053923Courtesy of FORD MOTOR CO.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
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