Perkins M250C - Transmission Oil Pressure Is High

KENR9126 67
Troubleshooting Section
Throttle S igna l
Monitor the status for “Throttle Position” on the
electronic service tool. Verify that the status for
“Throttle Pos
ition” is stable and that the engine is able
to reach high idle speed. Refer to the appropriate
diagnostic functional test for your application:
•
Troubleshooting, “Throttle Position Sensor - Test”
•
Troublesho
oting, “Speed Control (PWM) - Test”
Fuel Rail Pressure
1. If service has recently been performed on the
engine, air may be present in the fuel system.
Check for a
ir in the fuel system.
2. Check the pressure in the fuel system.
Electrical Connectors
Disconne
ct the J1/P1/E-C1 and J2/P2/A-C1 ECM
connectors. Inspect each connector for moisture
and corrosion. Also, inspect the harness and
connect
ors for the unit injectors from the ECM to the
valve cover. Refer to the diagnostic functional test
Troubleshooting, “Electrical Connectors - Inspect”.
Electronic Unit Injectors
1. Use the
electronic service tool to perform the
injector solenoid test in order to determine if all of
the injector solenoids are being energized by the
ECM.
2. Perform the cylinder cutout test on the electronic
servi
ce tool in order to check the performance of
each cylinder. Refer to the diagnostic functional
test Troubleshooting, “Injector Solenoids Circuit -
Test”
.
Intake Manifold (Boost) Pressure Sensor
1. Monitor the status of “Intake Manifold (Boost)
Pressure” for normal operation on electronic
serv
ice tool. When the engine is not running,
“Intake Manifold (Boost) Pressure” should be
0kPa(0psi).
Air Inlet and Exhaust System
1. Che
ck the air filter restriction indicator for a
plugged filter. If necessary, service the engine.
2. Ch
eck the air inlet and exhaust system for
restrictions and/or leaks.
Fuel Supply
1. Visually check the fuel level in the fuel tank. Do not
rely on the fuel gauge only. If necessary, add fuel
to the fuel tan
k. If the engine has been run out of
fuel, it will be necessary to prime the fuel system.
2. Check the fue
l lines for the following problems:
restrictions, collapsed lines, and pinched lines. If
problems are found with the fuel lines, repair the
lines and/o
r replace the lines.
3. Check the fuel tank for debris or foreign objects
which may bl
ock the fuel supply.
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.
4. Prime the
fuel system if any of the following
procedures have been performed:
•
Replace
ment of the fuel filters
•
Service on the low-pressure fuel supply circuit
•
Replacement of unit injectors
Note: A
sight glass in the low-pressure supply line is
helpful in diagnosing air in the fuel.
5. Check f
uel quality. Cold weather adversely affects
the characteristics of the fuel.
6. Check
the filtered fuel pressure while the engine is
being cranked. If the fuel pressure is low, replace
the fuel filters. If the fuel pressure is still low, check
the f
ollowing items: fuel transfer pump and fuel
pressure relief valve.
i04012482
Tra
nsmission Oil Pressure Is
High
Pr
obable Causes
Relief valve f ailure
Recommended Actions
Relief Valve Failure
1
.
L
ocate the relief valve for the transmission oil.
2. Remove any blockages and check the operation
of the relief valve.