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% 2. Description and Operation
% Figure 1 shows the schematic diagram of the engine control system. The system has a Full Authority % Digital Engine Control (FADEC) System. In this AMM we call it the engine control system.
% The system has two independent computers, either of which can provide all control functions for the % engine and propeller. The system has these main parts:
%) Two digital engine control units (ECU A and ECU B located in one box below the pilot’s seat).
%) An electrical harness that connects the ECU's to the engine, the power lever, the annunciator % panel, control buttons and some instruments.
%) Sensors that measure engine parameters.
%) An electrical power lever located in the center console.
%) Control buttons for setting the second ECU in an emergency and testing the control system.
%

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% Figure 1: Engine Control System Schematic Diagram %
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Engine Controls
AMM

% A. Engine Control Units
% The ECU A and ECU B are contained in one box located under the pilot’s seat in the cockpit. A % harness connects the box to the engine, the power lever and some instruments.
% In the usual operation, the alternator supplies power for the system. If the alternator fails, the ECU % B automatically takes over and the ECU backup battery provides power. Refer to Section 24-33 % for more data about the electrical supply for the engine control system.
% The annunciator panel at the top of the instrument panel has two amber caution lights for the % engine control system (marked ECU A and ECU B).
% The ECU SWAP switch on the left of the instrument panel lets you toggle between ECU A and % ECU B. For all normal operation, the switch is set to AUTOMATIC and the ECU A controls the % engine. You should only set the system to ECU B for testing.
% Note: The ECU SWAP switch only operates to change from ECU A to ECU B. If you % toggle back to AUTOMATIC, then ECU B remains in control until: % -the power lever is set to IDLE, and % -you push and hold the ECU TEST button until both ECU caution lights on the % annunciator panel go off.
% The ECU TEST button on the left of the instrument panel lets you test the system. Refer to Section % 71-01 for the ECU test procedure.
% B. Electrical Harness
% The electrical harness is an engine component. The harness connects the power lever and sensors % to the ECU A and ECU B. It also provides connections for the ECU buttons, warnings and some % engine instruments.
% The electrical harness comes through the firewall on the left side. P-clamps and ty-raps attach the % electrical harness to the engine. The harness goes forward and divides to go down both sides of % the engine.
% The cables on the right side pass mainly along the cylinder head. They connect to the fuel pressure % regulator, fuel pressure sensor, fuel injectors and camshaft position sensors. A cable goes to the % intercooler outlet. Cables also go forward and down to the glow plugs, waste gate, right and left % crankshaft position sensors, gearbox temperature sensor, coolant temperature sensor, and % propeller governor.
% The left side of the engine has cables to the sensors for oil pressure and oil temperature and % cables for the starter and alternator.
% The repair of the electrical harness is limited to damage that occurs near the ends of the cables, % outside of the isolated section. If a cable fails within the isolated section, then you must replace the % complete harness.
　
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