Battery; Can Not Reach Top Engine Rpm - Perkins NJ Series Troubleshooting Manual

48
Troubleshooting Section

Battery

Note: This is not an electronic system problem.
Probable Causes
• Charging circuit
• Battery
•
Auxiliary device
Recommended Actions
Charging Circuit
If a fault in the battery charging circuit is suspected,
refer to Troubleshooting, "Alternator Will Not Charge".
Faulty Battery
1. Check that the battery is able to maintain a charge.
Refer to Testing and Adjusting, "Battery - Test".
2. If the battery does not maintain a charge,
replace the battery. Refer to the Operation and
Maintenance Manual, "Battery - Replace".
Auxiliary Device
1. Check that an auxiliary device has drained the
battery by being left in the ON position.
2. Charge the battery.
3. Verify that the battery is able to maintain a charge
when all auxiliary devices are switched off.
Can Not Reach Top Engine
RPM
Note: If this fault occurs only under load, refer to
Troubleshooting, "Low Power/Poor or No Response
to Throttle".
Probable Causes
•
Diagnostic codes
• ECM parameters
• Throttle signal from the throttle position sensor
i02344743
• Air intake and exhaust system
•
Fuel supply
• Individual malfunctioning cylinders
• Electronic unit injectors
Recommended Actions
Diagnostic Codes
Check for active diagnostic codes on the electronic
service tool. Troubleshoot any active codes before
continuing with this procedure.
ECM Parameters
1. Ensure that the problem is not a programmed
parameter.
2. Ensure that the correct mode was selected by
using the electronic service tool.
3. Use the electronic service tool to verify the correct
engine rating for the engine.
4. Use the electronic service tool to verify the
maximum engine speed limit.
5. Use the electronic service tool to verify the
following parameters at maximum speed: the
boost pressure, the smoke limit, the torque limit,
and the amount of fuel that is delivered.
6. Use the electronic service tool to reset the
parameters to the OEM specifications.
7. Ensure that the repairs have eliminated the
performance problems.
8. If the repairs have not eliminated the faults
i02528131
proceed to "Throttle Signal for the Throttle Position
Sensor".
Throttle Signal for the Throttle Position
Sensor
1. Use the electronic service tool and observe the
signal for the throttle position sensor. Make sure
that the throttle reaches the 100% raw position
and the calibrated position.
2. If the signal is erratic, refer to Troubleshooting,
"Analog Throttle Position Sensor Circuit - Test" or
refer to Troubleshooting, "Digital Throttle Position
Sensor Circuit - Test".
SENR9982-01