Low Power/Poor Or No Response To Throttle - Perkins NJ Series Troubleshooting Manual

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Troubleshooting Section
Engine Oil Suction Tube
1. Check the inlet screen on the oil suction tube
and remove any material that may be restricting
oil flow.
2. Check the joints of the oil suction tube for cracks
or a damaged joint that may allow air leakage into
the supply to the oil pump.
3. If no faults are found, refer to "Engine Oil Pump".
Engine Oil Pump
1. Inspect the components of the engine oil pump for
excessive wear. Repair the oil pump or replace
the oil pump, if necessary. Refer to Disassembly
and Assembly, "Engine Oil Pump - Remove",
Disassembly and Assembly, "Engine Oil Pump -
Install" and Disassembly and Assembly, "Engine
Oil Relief Valve - Remove and Install".
2. If no faults are found, refer to "Bearing Clearance".
Bearing Clearance
Inspect the engine components for excessive bearing
clearance or damaged bearings. If necessary,
replace the bearings and/or the components. Inspect
the following components for excessive bearing
clearance:
• Crankshaft main bearings
• Connecting rod bearings
• Camshaft front bearing
•
Idler gear bearing
Low Power/Poor or No
Response to Throttle
Probable Causes
• Diagnostic codes
•
ECM parameters
• Electrical connectors
• Air intake and exhaust system
•
Valve lash
• Turbocharger
• Fuel supply
•
Low compression (cylinder pressure)
• Individual malfunctioning cylinder
• Electronic unit injectors
Recommended Actions
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.
ECM Parameters
1. Use the electronic service tool to make sure that
the FLS and FTS parameters have been correctly
entered.
2. Use the electronic service tool to ensure that the
correct mode was selected.
3. Use the electronic service tool to verify that the
correct engine rating has been provided.
4. Use the electronic service tool to verify the
maximum engine speed limit.
5. Ensure that the repairs have eliminated the
performance problems.
i02535524
6. If the repairs have not eliminated the faults
proceed to "Electrical Connectors".
Electrical Connectors
1. Turn the keyswitch to the ON position.
2. Use the electronic service tool to verify that
the intake manifold pressure is 0 ± 0.5 kPa
(00 ± 0.070 psi). Check the 5 V sensor supply
for the intake manifold pressure. Refer to
Troubleshooting, "5 Volt Engine Pressure Sensor
Supply Circuit - Test".
3. Use the electronic service tool to verify the throttle
position status.
SENR9982-01
NOTICE