Troubleshooting Chart - Man D 2876 LE 101 Operating Instructions Manual

Note:
The troubleshooting chart applies to engines with EDC MS5/5.32.
For engines with EDC MS 6.1, not all points are applicable (EDC-specific).
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 shut-down, 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
x x
x
x x
x x
x
x x
x
x
x
x
x x
x x
x = Probable
o = Possible

Troubleshooting chart

14. Excessive smoke emission: White smoke / blue smoke
15. Excessive smoke emission: Black smoke
16. Engine temperature too high (coolant loss)
17. Intermediate engine speed control cannot be activated / does not switch off, engine revs too
high
18. Fuel consumption too high
19. Lubricating oil pressure too low
20. Lubricating oil pressure too high
21. Lubricating oil consumption too high
22. Engine too loud / mechanical noise
Possible causes
Batteries discharged, battery lead connections loose or corroded,
break in power circuit
Crank gear blocked
Starter solenoid switch sticks (clicks) / defective, cable connection loose or da-
maged
Starter / starter interlock relay defective (carbon brushes worked loose / worn,
winding defective, short to ground)
x x x Engine oil viscosity unsuitable, not suitable for ambient temperature, lubricating
oil quality does not correspond to specifications
x Oil level in sump too high
x Oil level in sump too low, oil in sump too thin (mixed with condensate or fuel)
x Engine temperature too high
x Oil filter clogged
x x Oil pressure gauge faulty
x Safety valve in oil circuit defective
(does not close, spring fatigued or broken)
x x Bearing wear
x Oil pump gears worn
x Crankshaft timing gears worn, tooth flank backlash too great
x x Engine cold
x Lubricating oil entering combustion chamber (piston rings worn, piston rings bro-
ken) − valve stem guide worn − overpressure in crankcase (crankcase vent clog-
ged)
x Relief valve in oil circuit faulty (does not open), oil lines / oil galleries clogged
x Leaks in lubricating oil circuit, particularly at turbocharger and oil cooler
o x Piston rings heavily worn, broken
x Piston pin or crankshaft bearing loose
o x Valve stems worn, bent
x Valve clearance not correct
Valves jam
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