Operation Manual of WEICHAI GENSET
Faults and Troubleshooting Methods of Diesel Engine
1. Start failure or start difficulty of diesel engine
Cause analysis: The following problems—starting system fault, fuel supply system fault,
and intake system fault may contribute to failure in starting of the diesel engine. If the
start failure is not caused by the above reasons, check whether the speed sensor and
wiring are correct.
Tab. 4-1 Faults of starting system
S/N Fault
1
The control system is not
powered ON
2
The battery is low or is
damaged
3
The fuse in control box is
blown
4
Fault of starter relay
5
Circuit fault
6
Fault of starter motor
Treatment method
Close the power switch of control box system
Check the battery voltage. In case of under-
voltage, charge it by floating charging device.
In case of damage, maintain and replace the
battery if necessary
Replace the fuse
Replace the starter relay
Eliminate any open circuit and poor contact;
check the connection for oxidation and clean
it if necessary
Contact after-sales service personnel for
repair or replacement
Tab. 4-2 Faults of fuel supply system
S/N Fault
Treatment method
1
There is no fuel in the
fuel tank
Filling of fuel
2
Fault of shutdown Check the shutdown solenoid valve and
solenoid valve
replace it if necessary
3
The fuel filter or the Replace the fuel filter and check the fuel hose
intake pipe is blocked for blockage
4
The suction pipe joint of Tighten all filter pipe joints from the fuel tank
fuel supply pump is loose to the fuel pump
5
Fault of fuel supply pump
Contact after-sales service
repair or replacement
personnel for
6
Fault of fuel injection Contact after-sales service personnel for
pump
repair or replacement
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