Troubleshooting

RENR2696-01 59
Troubleshooting Section
Bearing Clearance
Inspect the engine components for excessive bearing
clearance. If necessary, replace the bearings and/or
the component
s. The following list is an example
of the components that should be inspected for
excessive bearing clearance:
•
Crankshaft main bearings
•
Connecting ro
d bearings
•
Camshaft bearings
i01798135
Low Power/Poor or No
Response to Th rottle
Probable Causes
•
Refer to logged codes.
•
Fuel supply
•
Air intake and exhaust system
•
Individual cylinder problem
•
Valve lash
•
Low compression (cylinder pressure)
•
Fuel injection nozzles
•
Turbocharger (if equipped)
•
ECM parameters
•
Electrical connectors
Recommended Actions
NOTICE
Do not crank the engine continuously for more than
30 seconds. Allow the starting motor to cool for two
minutes before cranking the engine again.
Diagnostic 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 - Tes
t”.
2. Ensure that the fuel system has been primed.
Refer to Syste
ms Operation, Testing and
Adjusting, “Fuel System - Prime”.
3. Check the dies
el 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, Testing 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 ch
eck the fuel tank for fuel. The fuel
gauge may be faulty.
9. If the engin
e 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 tempe
rature is below 0 °C (32 °F), check
for solidified fuel (wax).
12. If the repa
irs 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 a
ir intake and the exhaust system for
the following defects:
•
Blockages
•
Restrictions
•
Damage to the air intake and exhaust lines and
hoses
4. Make all necessary repairs to the engine.
5. Ensure tha
t the repairs have eliminated the
diagnostic code.
6. If the prob
lem has not been eliminated, proceed
to “Individual Malfunctioning Cylinders”.