DDEC TROUBLESHOOTING Flash  Codes DDEC  Description 46 ECM battery voltage low 47 Fuel, air inlet, or turbo boost, pressure high 48 Fuel or air inlet pressure low 52 ECM A/D  conversion fault 53 ECM non volatile memory fault 54 Vehicle speed sensor fault 55 J1939  data  link  fault 56 J1587  data  link  fault 57 J1922  data  link  fault 58 Torque  overload 61 Injector response time long 62 Auxiliary output short to battery (+) or open circuit, or mechanical fault 63 PWM drive short to battery (+) or open circuit 64 Turbo speed sensor input fault 65 Throttle valve position input fault 66 Engine knock sensor input fault 67 Coolant or air inlet, pressure sensor input voltage fault 68 TPS idle validation switch open circuit or short to ground 71 Injector response time short 72 Vehicle  overspeed 73 Gas valve position input fault or ESS fault 74 Optimized idle safety loop short to ground 75 ECM battery voltage high 76 Engine overspeed with engine brake 77 Fuel  temperature high 81 Oil level, crankcase pressure, dual fuel BOI, or exhaust temperature voltage high 82 Oil level, crankcase pressure, dual fuel BOI, or exhaust temperature voltage low 83 Oil level, crankcase pressure, exhaust temperature, or external pump pressure high 84 Oil level or crankcase pressure low 85 Engine  overspeed 86 External pump or barometer pressure sensor input  voltage  high All information subject to change without notice. 6SE497  9709  Copyright © 1997 DETROIT DIESEL CORPORATION 5-7