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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1596 ((Antilock Brake System (Abs) - Electrical Diagnostics - 2500 Hd)) >> DTC Troubleshooting >> C0078-86-Tire Diameter - Signal Invalid >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. INCORRECT TIRES PROGRAMMED INTO BCM 
    1. Inspect all four tires on the vehicle and note the size of each tire.
      NOTE:

      A non-production size tire cannot be programmed into the BCM. The production Powertrain, with the production size tires, is the only emissions certified configuration that is available for reprogramming.

    2. Verify the correct Tire/wheel information is programmed in the BCM.

      Is the correct value programmed in the BCM?

      Yes 

      • Go To  2

      No 

      • Program the correct Tire/Wheel information in the BCM.
      • Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  2. PERFORM ABS MODULE INITIALIZATION 
    1. Turn the ignition on.
    2. With the scan tool, read and record the ABS DTCs.
    3. With the scan tool, under "Miscellaneous Functions" perform the ABS Initialization routine. Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
    4. With the scan tool, read the DTCs.

      Does the DTC remain active?

      Yes 

      No 

      • Test complete.