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(1)  Make sure that the engine is safe: S Set the ELECTRIC MASTER key switch to OFF. S Set the ENGINE MASTER switch to OFF. S Set the power lever to IDLE. 
(2)  Remove the engine cowlings.  Refer to Section 71-11. 
(3)  Disconnect the airplane main battery.  Refer to Section 24-34. 
(4)  Remove the coolant radiator.  Refer to Section 75-01. 
(5)  Remove the left pilot’s seat.  Refer to Section 25-10. 
(6)  Remove the instrument panel cover.  Refer to Section 25-10. 
(7)  Remove the power lever.  Refer to Paragraph 2.A. 
(8)  Release the 2 electrical connectors from the ECU.  Refer to Figure 3. 
(9)  Release the connections at these terminal blocks: S Glow. S ECU Bus. S Instruments and Annunciator Panel.  Behind the instrument panel. 

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Detail Steps/Work Items  Key Items/References 
(10)  Disconnect the engine wire harness and bonding cables from these electrical sensors: S Crankshaft 1. S Crankshaft 2. S Camshaft 1. S Camshaft 2. S Coolant temperature. S Oil temperature. S Oil pressure. S Manifold air temperature. S Fuel rail pressure regulator. S Fuel rail pressure sensor. S Propeller governor. S Gear temperature. S Waste gate valve solenoid. S Fuel injectors. S Glow plugs. S Waste gate control valve.  At the front right crank case. At the front left crank case. On inlet valve cover between cyl. 3 & 4. On inlet valve cover between cyl. 1 & 2. At the thermostat valve. At the bottom of the oil case. At the rear side of the oil filter housing. On the intercooler outlet pipe. At the rear end of the fuel rail. At the front side of the fuel rail. At the right side of the reduction gear. At top left of front bearing reduction gear. At the lower crankshaft cover. At each fuel injector. At the lower crankshaft cover. At the lower crankshaft cover. 
(11)  Remove the cable-ties and clamps that attach the cable harness to the engine and structure.  Make a note of the type and location of each attachment. 
(12)  Remove the shields for the feed-through at the firewall. 
(13)  Carefully move the harness aft through the firewall.  Take care not to damage the connectors. 
(14)  Remove the harness from the airplane. 

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DA 40 Series AIRCRAFT AMM
Manifold Pressure
Hose to ECU

Oil Pressure Sensor
　
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