No Start - Kohler KG2204 Service

3.3. No Start

Definition: The engine cranks but does not start.
Checks
Preliminary Checks
ECM Checks
Sensor Checks
Fuel System Checks
Ignition System Checks
Engine Mechanical Checks
Exhaust System Checks
Figure 3-5 No Start Troubleshooting
TP-6903 5/16a
Action
None
 Use Spectrum to :
o Check for proper communication with the ECM
o Check battery power, ignition power and ground circuits to the ECM.
 Check the TMAP sensor.
 Check the crankshaft position sensor for output (rpm). This can be verified by an RPM
signal on Spectrum.
Note: A closed gas supply valve will create a no start condition.
 Verify proper operation of the shut-off solenoid valves.
 Check for air intake system leakage around the fuel pressure regulator, air-fuel mixer
and throttle body.
 Check for air intake system leakage at all connections between the air-fuel mixer and
throttle body on turbocharged engines.
 Check the fuel system pressures.
 Check for the proper ignition voltage output.
 Verify that the spark plugs are correct.
 Check the spark plugs for the following conditions:
o Wet plugs (oil fouling)
o Cracks.
o Wear.
o Improper gap.
o Burned electrodes.
o Heavy deposits.
 Check for bare or shorted ignition leads.
 Check for loose ignition coil connections at the coil.
 Check for the following:
o Manifold vacuum leaks.
o Air-fuel mixer vacuum leaks.
o Charge air cooler leaks on turbocharged engines.
o Engine vacuum leaks.
o Improper valve timing.1
o Low compression.
o Improper valve clearance.
o Worn rocker arms.
o Broken or weak valve springs.
o Worn camshaft lobes.
 Check the exhaust system for a possible restriction:
o Inspect the exhaust system for damaged or collapsed pipes.
o Inspect the muffler for signs of heat distress or for possible internal failure.
 Check that the turbocharger turbine and compressor blades do not rub or bind against
the turbocharger housing.
Fuel System Troubleshooting 49