TROUBLESHOOTING THE NHEL CONTROL
Trouble
Engine
Cranks But
Does Not Start
Engine Starts
But Stops When
Start Switch
Is
Released
Possible
Cause
1.
Faulty ignition due to worn
or fouled spark plugs, worn
ignition points, incorrect
ignition timing, or faulty
plug wires.
2.
Faulty fuel system due to
carburetor mixture screws
incorrectly adjusted, plugged
fuel filter, faulty regulator,
or faulty fuel solenoid.
3.
Connect a voltmeter between
positive
(+)
terminal on
coil and ground. Check for
battery voltage when
SI
is
placed in the Start position.
If voltage is not present,
fault is due to:
a. open circuit between coil and
control or
b. defective control
PC
board.
1.
Low oil pressure switch not
closing
due
to:
a. low oil pressure
b.
open circuit between
switch and control,
c. defective low oil pressure
switch,
d.
low oil pressure.
2.
K5
relay contacts not opening
due to:
a.
K5
relay circuit open or
b. defective
K5
relay.
3. Output voltage from
generator not being suppled
to control due to:
a. defective charge resistor.
b.
open circuit in wiring between
generator and control,
c. defective bridge rectifier, or
d.
no output voltage from generator
4.
Defective control PC board
1.
2.
3a.
3b.
Refer to Ignition System
section for test and
service procedures
Refer to Fuel System
section for test and
service procedures
Check for continuity and
correct if circuit is
open.
Replace control PC board.
1
a.
1
b.
1
c.
1
d.
2a.
2b.
3a.
3b.
3c,d.
4.
Check oil level and add
oil
if
low
Check for continuity and
correct
if
circuit is open
Replace low oil pressure
switch
Refer to Lubrication system
section for test and
service procedures
Check for continuity and
correct if circuit is open
Replace
K5
relay
Test R6 charge resistor
(2.5
ohm)
and replace if
defective.
Check for continuity and
correct
if
circuit is open
Refer to Generator section
for test and service
procedures.
Replace control PC board
Corrective Action
7-1
2
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
To Next Page
Loading...
Need help?
General
