Troubleshooting table x = Possibleo o = Probable 16 1. EDC self-diagnosis or flash code output 2. Starter turns over engine only slowly or not at all 3. Starter turns, engine does not start, engine does not start / difficult to start when cold 4. Engine stalls (dies) during operation, no longer starts (starter turns), engine does not start/starts with difficulty when hot 5. Sudden, temporary engine shutdown, engine does not reach full revs 6. Engine only runs at idle speed, no throttle response 7. Engine only runs at increased idle speed, no throttle response 8. Rated engine speed distinctly reduced (even under no load) 9. Reduced output in all ranges 10.
Irregular engine operation, traction loss 11. Unstable idle speed, engine hunting, misfiring, knocking in engine 12. Engine judder 13. Unusual combustion noise 14. Excessive smoke emission: White smoke/blue smoke 15. Excessive smoke emission: Black smoke 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubricating oil pressure too low 19. Lubricating oil pressure too high 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes 2. Starter turns over engine only slowly or not at all 3.
Starter turns, engine does not start, engine does not start / difficult to start when cold 4. Engine stalls (dies) during operation, no longer starts (starter turns), engine does not start/starts with difficulty when hot 5. Sudden, temporary engine shutdown, engine does not reach full revs 6. Engine only runs at idle speed, no throttle response 7. Engine only runs at increased idle speed, no throttle response 8. Rated engine speed distinctly reduced (even under no load) 9. Reduced output in all ranges 10. Irregular engine operation, traction loss 11. Unstable idle speed, engine hunting, misfiring, knocking in engine 12. Engine judder 13. Unusual combustion noise 14. Excessive smoke emission:
White smoke/blue smoke 15. Excessive smoke emission: Black smoke 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubricating oil pressure too low 19. Lubricating oil pressure too high 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes 4. Engine stalls (dies) during operation, no longer starts (starter turns), engine does not start/starts with difficulty when hot 5. Sudden, temporary engine shutdown, engine does not reach full revs 6. Engine only runs at idle speed, no throttle response 7.
Engine only runs at increased idle speed, no throttle response 8. Rated engine speed distinctly reduced (even under no load) 9. Reduced output in all ranges 10. Irregular engine operation, traction loss 11. Unstable idle speed, engine hunting, misfiring, knocking in engine 12. Engine judder 13. Unusual combustion noise 14. Excessive smoke emission: White smoke/blue smoke 15. Excessive smoke emission: Black smoke 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubricating oil pressure too low 19. Lubricating oil pressure too high 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22.
Idle speed cannot be adjusted with idle speed operating unit Possible causes 6. Engine only runs at idle speed, no throttle response 7. Engine only runs at increased idle speed, no throttle response 8. Rated engine speed distinctly reduced (even under no load) 9. Reduced output in all ranges 10. Irregular engine operation, traction loss 11. Unstable idle speed, engine hunting, misfiring, knocking in engine 12. Engine judder 13. Unusual combustion noise 14. Excessive smoke emission: White smoke/blue smoke 15. Excessive smoke emission: Black smoke 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubricating oil pressure too low 19.
Lubricating oil pressure too high 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes 8. Rated engine speed distinctly reduced (even under no load) 9. Reduced output in all ranges 10. Irregular engine operation, traction loss 11. Unstable idle speed, engine hunting, misfiring, knocking in engine 12. Engine judder 13. Unusual combustion noise 14. Excessive smoke emission: White smoke/blue smoke 15. Excessive smoke emission: Black smoke 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubricating oil pressure too low 19.
Lubricating oil pressure too high 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes 10. Irregular engine operation, traction loss 11. Unstable idle speed, engine hunting, misfiring, knocking in engine 12. Engine judder 13. Unusual combustion noise 14. Excessive smoke emission: White smoke/blue smoke 15. Excessive smoke emission: Black smoke 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubricating oil pressure too low 19. Lubricating oil pressure too high 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22.
Idle speed cannot be adjusted with idle speed operating unit Possible causes 12. Engine judder 13. Unusual combustion noise 14. Excessive smoke emission: White smoke/blue smoke 15. Excessive smoke emission: Black smoke 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubricating oil pressure too low 19. Lubricating oil pressure too high 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes 14. Excessive smoke emission: White smoke/blue smoke 15. Excessive smoke emission: Black smoke 16. Engine temperature too high (coolant loss) 17.
Fuel consumption too high 18. Lubricating oil pressure too low 19. Lubricating oil pressure too high 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes 16. Engine temperature too high (coolant loss) 17. Fuel consumption too high 18. Lubricating oil pressure too low 19. Lubricating oil pressure too high 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes 18. Lubricating oil pressure too low 19. Lubricating oil pressure too high 20. Lubricating oil consumption too high 21.
Engine too “loud” / mechanical noise 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes 20. Lubricating oil consumption too high 21. Engine too “loud” / mechanical noise 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes 22. Idle speed cannot be adjusted with idle speed operating unit Possible causes x x x EDC turbo pressure sensor: Defective, incorrect, implausible with atmospheric pressure sensor, line defective x x o x Needle movement sensor:
Too many / few pulses x x x o o Deviation in the control of the beginning of injection x x o x Exhaust turbocharger leaking or defective x Turbine and compressor rotor in turbocharger dirty (out-of-balance, irregular running) x Intercooler leaking, defective x x Charge-air preheater defective x o x x o x EDC coolant temperature sensor: Defective, line defective x x x EDC turbo air temperature sensor:
Defective, line defective o x x Radiator dirty or failure of cooling system (temperatures too high) x Coolant level too low, air in coolant circuit x V-belt for water pump drive not tensioned correctly x x Incorrect V-belt tension x Water pump leaking, defective / thermostat defective, does not open x Coolant lines leaking, clogged or twisted x Coolant entering combustion chamber (cylinder head / gasket leaking) x x x o Resistor bank EDC control unit pin 35 x x x o o Power supply to EDC control unit interrupted or battery voltage too low / Relais K1 defekt x x o o Line terminal 15 to EDC control unit pin 47 interrupted/loose contact / Relais K2 defekt x x Operating unit for setting idle speed/resistor bank pin 44:
Voltage values incorrect/implausible, operating unit switched off x o o o EDC control unit defective (internal fault) x x x x o o o x Incorrect EDC control unit (check MAN part number) x EOL programming terminated / voltage interrupt x Afterrunning not completed x EOL programming: Configuration incorrect x x Thermostat defective x Engine bearings worn x x x CAN system (control unit) faulty connection between EDC and MMDS Engine operating data not displayed