Perkins NJ Series Troubleshooting Manual page 172

172 SENR9982-01
Troubleshooting Section
The fuel rail pump solenoid forms part of the closed
loop control system for the fuel rail pressure in
conjunction with the fuel rail pressure sensor, ECM
and the software. The fuel rail pressure sensor
measures the fuel pressure in the high pressure fuel
rail. The fuel rail pressure sensor signal is processed
by the ECM and software. The measured pressure
is compared to the desired fuel rail pressure for the
given engine operating conditions.
If the fuel rail pump solenoid fails, it is likely that the
fuel will not be pumped into the high pressure fuel rail
and engine shutdown or failure to start the engine is
expected. No fuel rail pressure can be observed on
the status screen of the Perkins Electronic Service
Tool (EST).
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Illustration 68
Typical schematic of the circuit for the fuel rail pump solenoid
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Illustration 69
Typical view of the P2 ECM pin locations for the electrical power supply circuit
(25) Fuel rail pump solenoid PWM signal (26) Fuel rail pump solenoid return