THDC / THDCP - 954 / 955 / 974 (Rev. 06/03)
THDC / THDCP - 954 / 955 / 974 (Rev. 06/03)
1-18
1-18
P
Prro
ob
blle
em
m
C
Ca
au
us
se
e
C
Co
orrrre
ec
cttiio
on
n
20.
20. Engi
Engine runs ro
ne runs rough
ugh
or misfires
or misfires
(Continued)
(Continued)
2.
2. Engi
Engine oper
ne operatin
ating in low
g in low ambi
ambient
ent
temperatures.
temperatures.
3.
3. Elec
Electron
tronic faul
ic fault codes ar
t codes are acti
e active
ve
..
4.
4. Fu
Fuel
el le
leak.
ak.
5.
5. Fuel
Fuel grad
grade is no
e is not cor
t correc
rect or fu
t or fuel
el
quality is poor.
quality is poor.
6.
6. Ai
Air i
r in t
n the f
he fuel
uel..
7.
7. Fuel
Fuel fil
filter(
ter(s) ar
s) are plugg
e plugged.
ed.
8.
8. Over
Overhead adj
head adjust
ustment
ments are i
s are incor
ncor--
rect.
rect.
9.
9. Engi
Engine mo
ne mounts
unts are w
are worn o
orn or dam
r dam--
aged.
aged.
2.
2. Refe
Refer to
r to the C
the Cumm
ummins
ins Engin
Engine
e
Operation and Maintenance
Operation and Maintenance
Manual.
Manual.
3.
3. Re
Refer
fer to
to the
the
QSM11 Fault Code
QSM11 Fault Code
Information
Information
chart in this section.
chart in this section.
4.
4. Chec
Check the fue
k the fuel lin
l lines, fu
es, fuel con
el connec-
nec-
tions, and the fuel filters for leaks.
tions, and the fuel filters for leaks.
5.
5. Refe
Refer to Cor
r to Correc
rection 1. o
tion 1. of Prob
f Problem
lem
17. of this troubleshooting chart.
17. of this troubleshooting chart.
6.
6. Chec
Check for ai
k for air in the f
r in the fuel and ti
uel and tighten
ghten
fuel connections and
fuel connections and filter
filter..
7.
7. Repl
Replace f
ace fuel f
uel filt
ilter(
er(s).
s).
8.
8. Meas
Measure an
ure and adjus
d adjust the ov
t the overhea
erhead
d
settings
settings.
. Refer to t
Refer to the Cummi
he Cummins
ns
Engine Operation and Mainte-
Engine Operation and Mainte-
nance Manual.
nance Manual.
9.
9. Vis
Visuall
ually chec
y check engi
k engine moun
ne mounts and
ts and
replace if necessary.
replace if necessary.
10.
10. Contact a Cum
Contact a Cummins Author
mins Authorized
ized
Repair Facility.
Repair Facility.
21.
21. Engi
Engine shuts of
ne shuts off
f
unexpectedly or
unexpectedly or
dies during decel-
dies during decel-
eration
eration
1.
1. Elec
Electron
tronic faul
ic fault codes ar
t codes are acti
e active.
ve.
2.
2. Batt
Battery v
ery volt
oltage supp
age supply to t
ly to the elec
he elec--
tronic control module (ECM) has
tronic control module (ECM) has
been lost.
been lost.
3.
3. Engi
Engine wi
ne will n
ll not re
ot restar
start.
t.
4.
4. Fuel i
Fuel inlet r
nlet restr
estrict
iction or air i
ion or air in the
n the
fuel.
fuel.
5.
5. Low
Low batt
battery
ery volt
voltage.
age.
6.
6. Loos
Loose wir
e wire on mas
e on master di
ter disco
sconnect
nnect
switch.
switch.
7.
7. Fuel
Fuel cuto
cutoff v
ff valve i
alve is cl
s closed.
osed.
8.
8. Fuel
Fuel grad
grade is no
e is not cor
t correc
rect or fu
t or fuel
el
quality is poor.
quality is poor.
1.
1. Re
Refer
fer to
to the
the
QSM11 Fault Code
QSM11 Fault Code
Information
Information
chart in this section.
chart in this section.
2.
2. Chec
Check the bat
k the batter
tery conne
y connecti
ctions.
ons.
Check the fuses and the un-
Check the fuses and the un-
switc
switched
hed battery supply
battery supply circ
circuit.
uit.
3.
3. Refe
Refer to Pr
r to Proble
oblems 14
ms 14. and 15.
. and 15. of
of
this troubleshooting chart.
this troubleshooting chart.
4.
4. Check
Check fuel tan
fuel tank, fuel
k, fuel filter
filter, fuel
, fuel
lines, connections and fuel cooling
lines, connections and fuel cooling
plate.
plate.
5.
5. Chec
Check batt
k battery po
ery power s
wer suppl
upply cir
y cir--
cuits.
cuits.
6.
6. Isol
Isolate and ti
ate and tighten wi
ghten wire conn
re connecti
ection.
on.
7.
7. Chec
Check for l
k for loose w
oose wire
ires and pow
s and power to
er to
the fuel cutoff valve solenoid.
the fuel cutoff valve solenoid.
8.
8. Refe
Refer to Cor
r to Correc
rection 1. o
tion 1. of Prob
f Problem
lem
17. of this troubleshooting chart.
17. of this troubleshooting chart.
9.
9. Cont
Contact a Cu
act a Cumm
mmins Au
ins Author
thorize
ized
d
Repair Facility.
Repair Facility.
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