BI620123
Service Manual
FAULT DIAGNOSIS GUIDE The electronic shutdown system is designed to stop the engine whenever something endangers the machine or the operator. There can be various such events. If the engine suddenly stops, the display LEDs will probably indicate what is wrong. With the electronic shutdown system switched on and the engine not running, the oil pressure, the coolant circulation, the solenoid and the charging display LEDs must be on, so ignore them. They are only important when the engine is running. Following examples of fault diagnosis: 1.
Engine stops, all display LEDs go out: This is likely to be a wire break in the power supply line or in the start/reset line.
2.
Engine stops, some display LEDs are still on: This may be due to a fault in the solenoid circuit. The solenoid display LED will be on when the engine has stopped, but if the on/off toggle switch is toggled (i.e. electronic shutdown system powered down and up again), the solenoid display LED on the display should go out after 17 seconds. If it does not, the fault is in the solenoid wiring or in the solenoid itself.
3.
Engine stops, some display LEDs are still on: Look for a display LED that should not be on, because the stop is likely to be due to one of the field sensors tripping. Check which display LED is on beside the four that signal the engine has stopped. The electronic shutdown system does not differentiate between a sensor signaling alarm and its wire or connection breaking. First check whether the alarm is valid (is engine or gas temperature high or coolant low etc.). A display LED may also be flashing. This means that the fault is in the wire to the relevant sensor, e.g. a short between the wires, and a short to frame. If a display LED is flashing, examine the appropriate wire.
4.
Engine stops, some display LEDs are still on: Look for a display LED that should not be on. If there is not one, trouble is likely to be due to either the oil pressure or the coolant circulation sensors. Toggle the on/off toggle switch and try starting the engine again. The engine should run for about 25 seconds even if there is no oil pressure and/or no coolant circulation. Watch the oil pressure gauge. If that is in order but the engine still stops after 25 seconds, it is likely that coolant circulation has stopped.
5.
Engine stops, one or both methane alarms flash: This means that either the methane detector itself is faulty, or its cable is damaged.
6.
Engine keeps running, but all display LEDs flash: This means that the battery voltage is low. Attention to the battery and charging is required.
Rev. 0
FBL 10 LHD/Utility Serial No. 80042
257
