New Holland WorkMaster 50 Service Manual page 964

Electrical systems - FAULT CODES
DTC 535-03-Maximum rail pressure exceeded
Control Module : ECU
NOTE: If the rail pressure sensor B-9004 is replaced, it is necessary to perform the Replacement of the Rail Pressure
sensor - Reset ECU Data with the Electronic Service Tool (EST) before you return the machine to service. See
Common rail pressure sensor - Configure - Reset ECU data (Rail pressure sensor) (55.010), if necessary.
NOTE: If the Pressure Relief Valve (PRV) is replaced, it is necessary to perform the Replacement of the Rail Pressure
Relief Valve (PRV) - Reset ECU Data with the Electronic Service Tool (EST) before you return the machine to service.
See Common rail Relief valve - Configure - Reset ECU data (10.218), if necessary.
Context:
The Engine Control Unit (ECU) A-9000 monitors fuel rail pressure using the rail pressure sensor B-9004. If the ECU
A-9000 determines that rail pressure has exceeded 1790 bar (25955 psi), this fault will occur. A Pressure Relief Valve
(PRV), integral to the fuel rail, is designed to open in the event of an over-pressure in the fuel rail at approximately
1790 bar (25955 psi). If the ECU A-9000 determines that rail pressure has exceeded this threshold, a PRV failure
is assumed. Other active faults may have caused this fault to occur. For more information regarding fuel system
troubleshooting, see Fuel injection system - Troubleshooting (10.218).
Cause:
The ECU A-9000 has determined that rail pressure has exceeded 1790 bar (25955 psi).
Possible failure modes:
1. Faulty fuel back-flow, clogged.
2. Faulty PRV, unable to open to clogged return.
3. Faulty fuel metering unit Y-9000, stuck open or internal failure.
4. Faulty rail pressure sensor B-9004, drifted.
5. Faulty ECU A-9000, software.
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