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5 Troubleshooting Guidelines
Some simple typical diesel engine fault modes, possible causes and troubleshooting steps are listed in the table
below. If any one of modes occurs in engine operation, it is required to eliminate it by taking appropriate measures.
Otherwise, it would lead to severe engine failure. For simple engine faults, you can locate and eliminate them on your
own according to the sequence of possible causes (namely the steps of locating problems). For complex faults,
contact SDEC’s after-sale service center (spare@sdecie.com) for technical guidance.
No Fault mode No Fault mode
1 Alternator refuses to charge or fails to
charge enough
16 Diesel knock
2 Starting motor fault 17 Excessive noise
3 Engine is difficult to start or will not start 18 Black smoke
4 Engine starts, but will not keep running 19 White smoke
5 Liable misfire or unsteady speed 20 Blue smoke
6 Liable misfire at low speed 21 Fuel consumption too much
7 Engine cannot reach rated speed under load 22
Coolant temperature above normal --
gradual overheat
8 Engine power output low 23
Coolant temperature above
normal—sudden overheat
9 Rough running and misfiring 24 Coolant temperature below normal
10
Unexpected engine halt or misfire in
deceleration
25 Coolant contamination
11 Poor acceleration 26 Oil consumption too much
12 Engine will not stop 27 Oil pressure too high
13 Unsteady idle speed and engine hunting 28 Oil pressure too low
14 Rough running at idle speed 29 Oil contamination
15 Excessive vibration
Fault mode 1˖Alternator refuses to charge or fails to charge enough
Possible cause Correction
The instrument or indicator light failure Check and replace the instrument or indicator light
The battery connector(s) is loose or eroded Clean and tighten the battery connector(s)
The drive belt slip or failure of the belt tensioner
Check and replace the belt and check the spring
performance of the tensioner
Poor terminal contact of the alternator Tighten all terminal connects of the alternator
Fault mode 2˖Starting system fault
Possible cause Correction
The terminals and connectors of the starting
circuit and/or the battery are loose, open or
eroded
Clean and tighten all the terminals and the
connectors
Insufficient battery output
Adopt a battery with sufficient output or add some
more batteries in parallel
Starting motor fault Check the starting motor
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