Tennant ATLV 4300, Service Manual, Page: 95 / 206

ELECTRICAL
4-27
ATLV 4300 330495 (10--98)
ENGINE WILL NOT RUN
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
Starter motor
will not crank
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,
keep clear of rotating
fan and belt drive!
Engine runs
See previous page no Engine turns over, but won’t start.
Engine will not run
no
ok
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 goes out.
Replace
relay M2
ok
ok
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? Caution, keep clear of rotating fan and belt drive!
ok
Check the key switch: With a voltmeter, check for battery voltage at the key switch terminal AC (wire 2/BRN) with any
13/BLK wire while the key switch is in the on position.
no
Check wiring and repair or, reset
or replace circuit breaker CB--1.
ok
no
Check for fuel delivery from the fuel pump to the engine while
cranking the engine.
Caution, keep clear of rotating fan and belt drive!
ok
ok
yes
Replace the oil
pressure switch or
check for low oil
pressure problem.
no
yes
no
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
respect to ground, while cranking the engine and after the oil
pressure light has gone out.
Caution, keep clear of rotating fan and belt drive!
Replace the key switch
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.
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.
ok
no
Replace
fuel
pump
Replace fuel
solenoid
ok