Perkins NJ Series Troubleshooting Manual page 75

SENR9982-01
4. Run the engine until the speed is equal to the
maximum no-load speed.
5. Use the electronic service tool to make sure that
the throttle is set to reach the maximum no-load
speed.
6. If the maximum no-load speed can not be obtained
refer to Troubleshooting, "Throttle Switch Circuit
- Test" and Troubleshooting, "Mode Selection
Circuit - Test".
7. If the engine speed is erratic refer to
Troubleshooting, "Analog Throttle Position Sensor
Circuit - Test" or Troubleshooting, "Digital Throttle
Position Sensor Circuit - Test".
8. If the fault has not been eliminated, 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 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. If the fault has not been eliminated, proceed to
"Valve Lash".
Valve Lash
1. Check the valve lash and reset the valve lash, if
necessary. Refer to Testing and Adjusting, "Engine
Valve lash - Inspect and Adjust".
2. If the repair does not eliminate the fault proceed
to "Turbocharger".
Turbocharger
Note: The turbocharger that is installed on this
engine is a nonserviceable item. If any mechanical
fault exists, except for the wastegate actuator, then
the turbocharger must be replaced. The wastegate
actuator can be replaced.
1. Ensure that the mounting bolts for the turbocharger
are tight.
2. Check that the oil drain for the turbocharger is not
blocked or restricted.
3. Check that the compressor housing for the
turbocharger is free of dirt and debris.
4. Check that the turbine housing for the turbocharger
is free of dirt and debris.
5. Check that the turbine blades rotate freely in the
turbocharger.
6. Ensure that the wastegate on the turbocharger is
adjusted correctly. Refer to Testing and Adjusting,
"Wastegate - Inspect". If the wastegate actuator
is faulty, replace the wastegate actuator. Refer
to Disassembly and Assembly, "Turbocharger -
Disassemble" and Disassembly and Assembly,
"Turbocharger - Assemble".
7. If necessary, replace the turbocharger. Refer
to Disassembly and Assembly, "Turbocharger
- Remove" and Disassembly and Assembly,
"Turbocharger - Install".
8. Check that the repairs have eliminated the faults.
9. If the fault has not been eliminated, proceed to
"Fuel Supply".
Fuel Supply
1. Visually check the fuel tank for fuel. The fuel
gauge may be faulty.
2. Ensure that the fuel supply valve (if equipped) is
in the full OPEN position.
3. If the temperature is below 0 °C (32 °F), check
for solidified fuel (wax).
4. Check the primary filter/water separator for water
in the fuel.
5. Check for fuel supply lines that are restricted.
6. Check that the low pressure fuel lines are tight
and secured properly.
7. Check the fuel filters.
8. Check the diesel fuel for contamination. Refer to
Testing and Adjusting, "Fuel Quality - Test".
9. Check for air in the fuel system. Refer to Testing
and Adjusting, "Air in Fuel - Test".
10. Ensure that the fuel system has been primed.
Refer to Testing and Adjusting, "Fuel System -
Prime".
11. Check the fuel pressure. Refer to Testing and
Adjusting, "Fuel System Pressure - Test".
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Troubleshooting Section