New Holland WorkMaster 50 Service Manual page 874

Electrical systems - FAULT CODES
DTC 236-03-Rail pressure sensor value is above maximum offset
Control Module : ECU
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 the fuel Pressure Relief Valve (PRV). If the ECU A-9000 determines
that the PRV has been open for too long, this fault will occur. The PRV opening duration is monitored by the ECU
A-9000 and stored in the EEPROM during after run. This fault is for informational purposes only. If this fault is active,
other fuel system faults may be active that caused this fault to occur. Diagnose any faults that may have caused
this one to occur first, and then return to this fault, DTC 237-Max - Open time of PRV for wear out monitoring had
exceeded maximum value. For more information regarding fuel system troubleshooting, see Fuel injection system
- Troubleshooting (10.218).
Cause:
The ECU A-9000 has determined that the PRV has reached its maximum allowed open time.
Possible failure modes:
1. Faulty PRV, stuck open or worn.
2. Faulty fuel back-flow, clogged or damaged.
3. Faulty fuel metering unit Y-9000, internal failure.
4. Faulty rail pressure sensor B-9004, internal failure.
5. Faulty ECU A-9000, software.
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