Theory Of Operation

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The Diesel Exhaust Fluid (DEF) system holds a total of eight gallons of fluid. A series of warning levels to indicate to the customer when the fluid is low or incorrect. The Service DEF System - See Dealer Soon message will display on the Electronic Vehicle Information Center (EVIC) when the DTC is identified and reported to the Powertrain Control Module (PCM). Once the DTC is logged into the PCM memory, the Warning and Inducement Strategy begins. The Driver Warning and Inducement Strategy for a low fluid condition is as follows: The first warning will occur when the tank level is at approximately three gallons. The customer will here a chime and get an EVIC message reading "LOW DEF REFILL SOON". The second warning level will occur when the tank level is at approximately two gallons. The customer will here a chime and get an EVIC message reading "REFILL DEF ENGINE WILL NOT RESTART IN XXX MILES". If the message is ignored until the tank is empty, the vehicle will not start. The customer will here a chime and get an EVIC message reading "REFILL DEF ENGINE WILL NOT START". The vehicle will not start until a minimum of two gallons of approved Diesel Exhaust Fluid is added to the tank .