2009 Yamaha F40 Outboard Service Manual, Page 89Get this manual
TRBL SHTG Symptom 2
Troubleshooting
Cause Checking step Check the fuel injector operation using the YDISCheck the fuel injector resistanceCheck the fuel injector input voltageCheck for wiring continuity between the fuel injector and the main relayCheck for wiring continuity between the fuel injector and the engine ECMReplace the fuel injectorReplace the engine ECMCheck the timing beltCheck the compression pressureCheck the valve clearanceCheck the rocker arm for damageCheck the camshaft for damageCheck the valve and valve seat for wearCheck the piston and piston ring for damageCheck the cylinder for scratchRefer to page 5-21 5-21 5-21 5-21 A-3 5-21 A-3 6-38 7-19 7-15 7-1 7-2 7-41 7-41 7-37 7-51 7-53
Fuel not supplied (some Fuel injector malfunction cylinders) Short, open, or loose connection in fuel injector circuit
Compression pressure is low