Engine System, Diesel 231Service Manual – CS7000
There are several conditions that will override the user’s engine speed request.
• High pressure wash forces to run speed.
• If the engine is at idle speed, the engine will be forced to the run speed when sweeping only or vacuuming
only. The force idle (neutral time-out) will return the engine to idle speed.
• If the engine is at idle or run speed, the engine will be forced to maximum power speed when scrubbing
only or scrubbing and sweeping. The force idle (neutral time-out) will return the engine to idle speed.
• If the override is run speed, the user can change between maximum power speed and run speed.
• If the override condition goes away (e.g. sweep system turns off) and the user has not changed the engine
mode, the engine is returned to the mode before the forced override.
The controller is capable of identifying some fault conditions and displaying a fault code. A ashing LED
displays the fault conditions. When power is rst applied to the controller, the LED will ash just once for
one second to indicate that the LED is operational. If there is more than one fault, the LED will ash them
all. If there are no faults the LED will ash once every reset and from then on indicate the detection of
engine speed. The controller will attempt to shut the engine down for all faults and will not permit starting
after reset with fault 1, 5 and 6.
Note: If any fault in the APECS governor control system causes the engine to stall, the Engine
Warning message will be displayed on the control panel. This is because once the engine
stalls, engine oil pressure is lost and the main machine controller responds as it always does
when it sees a loss of oil pressure after the engine has been running. This means the main
machine controller will display the engine warning message and remove the power supply
from the APECS controller causing it to power down and turn off its status LED light.
Flash Code Fault Remedy
1 APECS unit not calibrated Calibrate APECS unit
2 Engine Speed Excessive Check parameter setting. Overspeed criteria may be
too sensitive
Check for electrical noise entering controller.
Check wiring and connections.
Check case ground.
Make sure linkage moves freely, without backlash.
Check tip of speed sensor.
3 Engine Speed too low Check parameter settings.
Check linkage and the actuator travel.
Check load and make sure it is not greater than the
capacity of the engine.
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