Fault table
14
1.
EDC self-diagnosis
2.
Starter motor turns over engine slowly or not at all
3.
Starter motor turns, engine fails to start, engine fails to start / difficult to start when cold
4.
Engine stalls (dies) during operation, no longer starts (starter motor turns),
engine fails to start / difficult to start when hot
5.
Sudden, temporary engine shutdown, engine does not reach full revs
6.
Engine runs at idle speed only, no throttle response
7.
Engine runs at increased idle speed only, no throttle response
8.
Rated engine speed significantly reduced (even at no load)
9.
Reduced power output in all ranges
10. Irregular engine operation, loss of traction
11. Unstable idle speed, engine surges, misfiring, engine knocking
12. Engine judder
13. Unusual combustion noises
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. Lubrication oil pressure too low
19. Lube oil pressure too high
20. Lube oil consumption too high
21. Engine too “loud” / mechanical noises
22. Idle speed cannot be adjusted with idle speed operating unit
Possible causes
x x x
x x
x
x
Fuel low pressure system: air in system (turn on ignition when bleeding system)
x x x
x x x x
x
x
Fuel low pressure system: feed pump, main filter
x
x
x x x o x
x
Fuel high pressure system: injectors defective / clogged / leaking / coked
x
x x x
o
Fuel high pressure system: pressure lines
−
constriction, cavitation, leaking
x
x
o x x x x
o
Fuel high pressure system: high-pressure pump worn
x
x
x x x o
Pedal value sensor (driving lever signal) defective: connection lines, short circuit,
interruption
x
x
EDC rpm sensor defective, lead defective
x
x o
EDC rpm sensor, polarity reversed
x
x x x o
o o
o
EDC detects incorrect engine speed (interference signal on rpm sensor lead)
x
x
x
EDC boost pressure sensor: faulty, incorrect, implausible with atmospheric pres-
sure sensor, line fault
x
x
o x
Exhaust turbocharger leaking or defective
x
Turbine and compressor wheel in the turbocharger soiled (running off balance)
x
Intercooler leaking, defective
x
o
x x
o
x
EDC coolant temperature sensor: faulty, line fault
x
x x
EDC charge-air temperature sensor: faulty, line fault
o
x
x
Radiator fouled or failure of cooling system (temperatures too high)
x
Coolant level too low, air in the coolant circuit
x
V-belt for coolant pump drive not tensioned correctly
x
x
Incorrect V-belt tension
x
Coolant pump leaking, defective / thermostat defective, does not open
x
Coolant lines leaking, blocked or twisted
x
Coolant entering combustion chamber (cylinder head / gasket leaking)
x
x x o
o
Power supply to EDC control unit interrupted or battery voltage too low
x
o o o
EDC control unit defective (internal fault)
x
Incorrect EDC control unit (check MAN part number)
x
Afterrunning not completed
x
x
Thermostat defective
x
Engine bearings worn
Summary of Contents for D 2842 LE 620
Page 1: ......
Page 2: ......
Page 20: ...Engine views D 2842 LE 620 18 7 1 2 4 3 5 6 7 1 2 4 11 9 10 8...
Page 136: ...134...
Page 137: ...135 Service Data...
Page 163: ...161 Special tools...
Page 164: ...Special tools 162 1 2 3 4 5 6 7 8 9 10 11 11 1 11 2 12 12 1 12 2 13 14...
Page 166: ...Special tools 164 15 1 15 2 15 3 15 4 15 5 1 2 7 15 6 3 4 5 6 15 7...
Page 170: ...Special tools 168 3 1 4 29 5 6 2 29 30 31 32 33 34 35...
Page 172: ...Special tools 170 36 37 38 39 42 40 41 44 2 44 1 44 43 1 43 2 43 3 43 45 46...
Page 178: ...176...
Page 179: ......
Page 180: ......
