
RENR5622 39
Troubleshooting Section
Intermittent Sensor Problem
Check for any recently logged diagnostic codes.
Check the connectors and wiring for any signs of
damage. Refer
to the diagnostic functional test
Troubleshooting, “Inspecting Electrical Connectors”.
i02421020
Can Not Reach Top E n gine
RPM
SMCS Code: 1000-038; 1901-038
Note: If this problem occurs under load, refer to
the diagnostic procedure Troubleshooting, “Low
Power/Po or Or No Respon se To Throttle ”.
Probable Causes
•
Derated engine
•
Cold mode
•
Flash file
•
Throttle signal
•
Fuel supply
•
Air inlet restriction
•
Exhaust restriction
•
Leaks in air system
•
Valve adjustment
•
Injectors
•
Faulty accessory equipment
Recommended Actions
Derate
Connect Caterpillar Electronic Technician (ET) and
check for an active derate event. A derate status
flag will appear on Cat ET if an active engine derate
is occurring. In order to view active events, go to
the “Events” menu under “Diagnostics”. Refer to
Troubleshooting, “Troubleshooting with an Event
Code” for the specific events for this application.
Cold Mode
Use Cat ET to verify that the engine has exited
cold mode. A status flag will appear if the engine is
operating in cold mode. This may limit engine speed.
Flash File
Verify that the correct flash file has been installed.
Throttle Signa
l
Use Cat ET in order to monitor the status of the
throttle. Obs
erve the throttle position. Verify that the
throttle position is smooth from low idle to high idle.
The throttle position should reach 100 percent at
high idle.
Fuel Sup ply
Check fuel lines for the following problems:
restrictions, collapse, and pinched line. Repair the
lines and/or
replace the lines.
1. Check the fuel tank for foreign objects which may
block the fue
l supply. Check for air leaks in the
suction line of the fuel pump. Prime the fuel system
after you perform the following procedures:
•
Replacing the fuel filters
•
Workingont
he low pressure fuel supply circuit
•
Replacing fuel injectors
2. Cold weather adversely affects the characteristics
of the fuel. Refer to the Operation and
Maintenanc
e Manual for information on improving
the characteristics of the fuel during cold weather
operation.
3. Check the fuel pressure during engine cranking.
Check the fuel pressure after the fuel filter. Refer
to the Syst
ems Operation/Testing and Adjusting
manual for the correct pressure values. If the fuel
pressure is low, replace the fuel filters. If the fuel
pressure i
s still low, check the following items: fuel
transfer pump, fuel transfer pump coupling, and
fuel pressure regulating valve.
Air Inlet Restriction
Replace p
lugged air filters and/or clean the filters.
Leaks in the air inlet manifold system can lower Inlet
manifold pressure.
Exhaust Restriction
Check the
exhaust system for restrictions and/or for
leaks.
Valve Ad
justment
Check the valve lash setting.