![]() No Go to step Visually check all DEF lines for physical damage (kinks, cracks, leaks, disconnects). Yes refer to Original Equipment Manufacturer (OEM) appropriate manual for DEF tank cleaning/flushing procedure. ![]() Do the test strips indicate contamination? a. If no pin damage is found, Go to step Using DEF test strip A to check for diesel fuel or oil contamination of the DEF fluid. If only SPN 4374/FMI 0 is present, Go to step Inspect the DEF dosing unit and DEF pump harness wiring and connector for damage, wire chafing, bent, spread or corroded pins. If other faults are active, including SPN 4334/FMI 3, 4, or SPN 4374/FMI 3, 4 troubleshoot the other faults first. Turn the ignition ON (key ON, engine OFF). DEF Pressure Monitor Sequence None Execution Frequency Continuous when enabling conditions met Typical Duration Continuous until resolved Dash Lamps MIL, CEL Engine Reaction Derate 25% Verification ADS Self Check NOTE: Retain a log file if Detroit Customer Assistance is required. SPN 4374/FMI 0 Description This diagnostic is typically an under pressurized DEF system Monitored Parameter DEF pump speed vs. ![]() 2 /FMI 0 GHG14 /FMI 0 GHG14 This diagnostic is typically an Under Pressurized Diesel Exhaust Fluid (DEF) System. ![]()
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