Kubota WG1605-E3, Diagnostic Manual

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ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-11
No Start
Checks Action
DEFINITION: The engine cranks OK but does not start.
Preliminary Checks • Refer to Important Preliminary Checks.
Control Module Checks
• Check the battery cranking voltage, voltage should not be less then 9.0 VDC.
• Check the inline fuse in the ECM battery power circuit. Refer to Engine Controls Schematics.
• Check battery power, ignition power and ground circuits to the ECM. Refer to Engine Control
Schematics. Verify voltage and/or continuity for each circuit.
Sensor Checks
• Check the TMAP sensor.
• Check the Camshaft position (CMP) and Crankshaft (CKP) position sensors.
• Check the Gasoline pressure sensor.
Fuel System Checks
• Check for fuel pump electrical circuit.
• Verify proper fuel pump pressure.
• Verify proper Fuel rail pressure.
• Refer to the Gasoline Fuel System Diagnosis.
• Check Electrical connections at the injectors.
Ignition System Checks
• Check for the proper primary side ignition voltage output.
• Verify that the spark plugs are correct.
• Check the spark plugs for the following conditions:
– Wet plugs
– Cracks
– Wear
– Improper gap
– Burned electrodes
– Heavy deposits
• Check for loose ignition coil connections at the coil.
Engine Mechanical Checks
• Check for the following:
– Vacuum leaks
– Improper valve timing
– Low compression
– Bent pushrods
– Worn rocker arms
– Broken or weak valve springs
– Worn camshaft lobes
Exhaust System Checks
• Check the exhaust system for a possible restriction:
– Inspect the exhaust system for damaged or collapsed pipes.
– Inspect the muffler for signs of heat distress, or for possible internal failure.
• Check for possible plugged catalytic converter. Refer to Restricted Exhaust System Diagnosis.
KiSC issued 12, 2016 A