Operation Section Basic Troubleshooting(LP) The MI-07 systems are equipped with built-in fault diagnostics. Detected system faults can be displayed by the Malfunction Indicator Lamp (MIL) and are covered in the Advanced Diagnostics section. Items such as fuel level, plugged fuel lines, clogged fuel filters and malfunctioning pressure regulators may not set a fault code by the Small Engine Control Module (SECM). Below are basic checks that should be made before referring to the Advanced Diagnostics section, if engine or drivability problems are encountered. Locating a problem in a propane engine is done exactly the same way as with a gasoline engine.
Consider all parts of the ignition and mechanical systems as well as the fuel system.
56 Problem Probable Cause Corrective Action Engine Cranking but Will Not Start Fuel container empty Fill fuel container z Do not exceed 80% of liquid capacity Liquid valve closed Slowly open liquid valve Excess flow valve closed Reset excess flow valve z Close liquid valve z Wait for a “click” sound z Slowly open liquid valve Plugged fuel line Remove obstruction from the fuel line z Close liquid fuel valve z Using caution, disconnect the fuel line (some propane may escape) z Clear obstruction with compressed air z Re-connect fuel line z Slowly open liquid fuel valve z Leak test Broken Fuse - SECM Replace Fuse for SECM z See Maintenance Section, Fuses replacement Clogged fuel filter Repair/replace as required z See Maintenance Section, LP Fuel Filter replacement Faulty vapor connection between the pressure regulator/converter and the mixer Check connection z Verify no holes in hose z Clamps must be tight z Look for kinked, pinched and/or collapsed hose Fuel Lock-off malfunction Repair/replace Fuel Lock-off z See Engine Service Manual Pressure regulator/converter malfunction Test pressure regulator/converter operation z See Engine Service Manual Incorrect air/fuel or ignition/spark control See Advanced Diagnostics No VR Sensor Signal Verify the VR signal is present z See Advanced Diagnostics