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HOMESERVICE MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1788 (STEERING SYSTEM - ELECTRONIC POWER ASSIST STEERING (EPAS))INTERACTIVE DIAGNOSTICSDTC / SYMPTOM SELECTIONDTC INDEX - POWER STEERING CONTROL MODULE (PSCM)DTC U0100: LOST COMMUNICATION WITH ECM/PCM ADESCRIPTION
2009 Mercury Milan Premier, 3.0 1, AWD

DTC U0100: Lost Communication with ECM/PCM A: Description

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Description
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

The PSCM will monitor the HS-CAN bus when the ignition has been on for more than 5 seconds, when the voltage to the PSCM is greater than 9 volts and when there are no DTCs present that are inhibiting PSCM operation.

  • DTC U0100:00 (Lost Communication with ECM/PCM A: No Sub Type Information) - This DTC will set if communications between the PSCM and the PCM fail. The PCM sends 2 message bundles to the PSCM. If 1 or both of these messages is missing for more than 5 seconds and the PSCM has not set DTC U0001:88, then the PSCM will set U0100:00.
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