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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 276 (Antilock Brake System (Abs) - Electrical Diagnostics - 1500) >> Diagnosis And Testing >> C0078-86-Tire Diameter - Signal Invalid >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. INCORRECT TIRES PROGRAMMED INTO BCM 
    TIRE SIZE BODY STYLE ENGINE SIZE SALES CODE TIRE CIRCUMFERENCE (MM)
    P265/70 R17 OWL GOOD YEAR SRA ALL SEASON DS ALL TTY 2472
    P265/70 R17 BSW GOOD YEAR ALL SEASON DS ALL TTM 2472
    P265/70 R17 BSW GOOD YEAR HP ON/OFF ROAD DS ALL TTS 2420
    LT265/70 17E OWL GOODYEAR SA ON/OFF ROAD DS ALL TXN 2424
    P275/60 R20 BSW GOOD YEAR SRA ALL SEASON DS ALL TTN 2570
    P275/60 R20 OWL GOOD YEAR SRA ALL SEASON DS ALL TUB 2570
    P275/60 R20 OWL GOOD YEAR SA ALL SEASON DS ALL TW6 2538
    P275/60 R20 OWL GOOD YEAR SA ALL SEASON DS ALL TUK 2538
    285/45 R22 BSW GOOD YEAR FORTERA SL ALL SEASON DS ALL TY4 2478
    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 according to the chart?

      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.
      WARNING:

      To avoid possible serious or fatal injury, check brake capability is available before road testing.

    3. Perform the ABS Module initialization. Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
      NOTE:

      The ABS Module Initialization process must include driving the vehicle into a 90° turn.

    4. Park the vehicle.
    5. With the scan tool, read the DTCs.

      Does the DTC remain active?

      Yes 

      • Perform the ABS Module Initialization routine again, if still unsuccessful.
      • Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
      • Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Test complete.
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