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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System - Active Cruise Control Module (Acc) - Electrical Diagnostics >> DTC Troubleshooting >> P1678-Ecu Sensor Adjustment Required >> Diagnostic Test

Diagnostic Test

  1. ADAPTIVE CRUISE CONTROL ALIGNMENT 
    NOTE: Vehicles that have had the suspension modified and/or a aftermarket grill installed that blocks the ACC sensor can cause the ACC system not to operate properly.
    1. Using a scan tool and the Service Information, perform the ADAPTIVE CRUISE CONTROL ALIGNMENT Procedure.

      Was the ADAPTIVE CRUISE CONTROL ALIGNMENT successful?

      Yes 

      No 

      • Make sure the lens is free of dirt, damage, and other obstructions that would hinder the performance of the ACC imager lens. Inspect for vehicle damage the may not allow that ACC system to be aligned properly. Repair as necessary. If no problems are found, replace the ACC Module in accordance with the service information.