Tennant ATLV 4300 Service Manual page 95

ENGINE WILL NOT RUN
Engine turns over, but won't start.
Check the key switch: With a voltmeter, check for battery voltage at the key switch terminal AC (wire 2/BRN) with any
Replace the key switch
Check wiring and repair or, reset
or replace circuit breaker CB- -1.
Check the oil pressure
switch:
Disconnect wire 10A/
GRN and check the oil
pressure switch with an
ohmmeter connected to
the pressure switch
terminal and engine
ground. Crank the
engine for a few
seconds to see if the
contacts change from a
closed to an open
condition Caution,
Replace
keep clear of rotating
relay M2
fan and belt drive!
no
Replace the oil
pressure switch or
check for low oil
pressure problem.
ok
Engine runs
ATLV 4300 330495 (10- -98)
First check to make sure :
1. Battery is charged.
2. Fuel in the fuel tank.
3. Unrestricted air filter.
4. Engine oil at full level.
5. CB- -1 is not tripped
Engine will not run
13/BLK wire while the key switch is in the on position.
no
Check engine circuit breaker:With a voltmeter, check for battery voltage at CB- -1, wire 3/BLU with
any 13/BLK wire while the key switch is in the on position.
no
Does the oil pressure light turn on with the key switch in the run position, and then go out after
cranking the engine for a while?
no
Checking M2 Relay :
With M2 installed, disconnect the electric fuel pump. Using a voltmeter, look for battery voltage
at the main harness connector to the fuel pump wires 9A/BRN and 13Q/BLK while trying to
start the engine.Caution, keep clear of rotating fan and belt drive! Battery voltage should
be present while the engine is cranking and after the oil pressure lamp
no
Check for fuel delivery from the fuel pump to the engine while
no cranking the engine.
Replace
fuel
pump
Disconnect the diesel fuel solenoid mounted to the side of the engine.
Check for battery voltage at each of the 4/YEL and 3/BLU wires with
no respect to ground, while cranking the engine and after the oil
ok
pressure light has gone out.
ok
Replace fuel
ok
solenoid
ok
Starter motor
will not crank
ok
ok
Caution, keep clear of rotating fan and belt drive!
yes
Caution, keep clear of rotating fan and belt drive!
Caution, keep clear of rotating fan and belt drive!
Checking the fuel solenoid:
Remove the diesel solenoid from the engine and reconnect to the
main harness. Disconnect the 4/YEL wire from the starter solenoid to
prevent the starter motor from turning. Turn the key switch to the start
positionand notice if the plunger on the solenoid moves.
ELECTRICAL
no See previous page
goes out.
yes
ok
ok
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