4-2. Unit Troubleshooting (Cont)..
TEST OR INSPECTION
Test starter. Use a multimeter and ensure that there are 12V to the starter when the ignition switch is
turned to START.
If there are 12V of power to the starter but it does not turn over, replace it (see paragraph 4-52).
ENGINE CRANKS BUT DOES NOT START.
Test the battery for low charge (see paragraph 4-20).
Replace battery as necessary (see paragraph 4-20).
Check the air restriction indicator. If it shows red, check the air cleaner filter element.
Replace the filter element as necessary (see paragraph 4-44).
Ensure that the exhaust system is not clogged.
Clear the exhaust system or replace as necessary (see paragraph 449).
Ensure that the fuel tank strainer element is clear of obstructions.
Clear the strainer element as necessary (see paragraph 4-46).
Ensure that the fuel is clean and free of contamination.
Drain the fuel tank, fuel filters, fuel pump, and fuel injector pump. Fill the fuel tank with clean fuel
and prime the fuel system (see paragraph 4-42).
Check the throttle control solenoid and circuit breaker. Turn ignition switch to ON and check the voltage
across the circuit breaker with a multimeter. The meter should read 12V. Turn ignition switch to ON and
check the action of the throttle control solenoid. If it does not activate, check the voltage across the
terminals with a multimeter.
Replace the circuit breaker as necessary.
If the voltage is less than 9V ensure the terminal connections are secure. If the voltage remains
below 9V, replace the solenoid (see paragraph 4-48).
Ensure that the fuel filter elements are clean.
Replace both filter elements as a set. Discard the old filter elements; do not attempt to clean or
reuse them (see paragraph 4-42).
Always prime the fuel system whenever a part of the fuel system has been disconnected or
equipment could be damaged.
Test the fuel pump. Disconnect the fuel line from the discharge side of the fuel pump. Crank the engine.
A well defined spurt of fuel should flow from the pump every other revolution of the engine.
Replace the fuel pump as necessary (see paragraph 4-43).