Troubleshooting

44 RENR2696-01
Troubleshooting Section
Note: If the problem is intermittent and the problem
cannot be dupli
cated, refer to Troubleshooting,
“Intermittent Low Power or Power Cutout”.
Note: If the pr
oblem only occurs under certain
conditions, test the engine under those conditions.
Examples of certain conditions are high rpm, full load
and engine op
erating temperature. Troubleshooting
the symptoms under other conditions can give
misleading results.
Probable Causes
•
Refer to the logged codes.
•
Fuel supply
•
Air intake and exhaust system
•
Individual malfunctioning cylinder
•
Valve lash
•
Low compression (cylinder pressure)
•
Fuel injection nozzles
•
Air inlet hea
ter starting aid
•
Engine speed/timing sensors
•
Throttle position sensor
•
Fuel injecti
on pump
Recommende
d Actions
Logged Codes
Check for active diagnostic codes on the electronic
service tool. Troubleshoot any active codes before
continuing
with this procedure.
Fuel Supply
1. Check the fuel pressure. Refer to Systems
Operation, Testing and Adjusting, “Fuel System
Pressure - T
est”.
2. Ensure that the fuel system has been primed.
Refer to Sy
stems Operation, Testing and
Adjusting, “Fuel System - Prime”.
3. Check the d
iesel fuel for contamination. Refer to
Systems Operation, Testing and Adjusting, “Fuel
Quality - Test”.
4. Check for air in the fuel system. Refer to Systems
Operation, Tes
ting and Adjusting, “Air in Fuel -
Te s t ” .
5. Check that the
fuel lines are tight and secured
properly.
6. Check for fuel
supply lines that are restricted.
7. Check the fuel filters.
8. Visually check the fuel tank for fuel. The fuel
gauge may be faulty.
9. If the engine has a water separator, check for
water in the fuel.
10. Ensure that the fuel supply valve (if equipped) is
in the full OPEN position.
11. If the temperature is below 0 °C (32 °F), check
for solidified fuel (wax).
12. If the repairs do not eliminate the problem
proceed to “Air Intake and Exhaust System”.
Air Intake and Exhaust System
1. Check the air
filter restriction indicator, if equipped.
2. Ensure that the air filter is clean and serviceable.
3. Check the air intake and exhaust systems for the
following defects:
•
Blockages
•
Restrictio
ns
•
Damage to lines or hoses
4. If the repairs do not eliminate the problem proceed
to “Individual Malfunctioning Cylinders”.
Individual Malfunctioning Cylinders
1. With the eng
ine speed at a fast idle, loosen the
high pressure fuel line to the fuel injection nozzle
of number 1 cylinder. Note if there is any reduction
in engine s
peed. Tighten the high pressure fuel
line to the fuel injection nozzle.
2. Individua
lly repeat this procedure for each fuel
injectionnozzle.Ifthereisnotareductioninthe
engine speed proceed to “Check the Air Inlet
Heater Sta
rting Aid”.
3. If there is a reduction in engine speed proceed to
“Valve La
sh”.