New Holland WorkMaster 50 Service Manual page 758

Electrical systems - FAULT CODES
DTC 137-12-Averaged rail pressure is outside the expected
tolerance range
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.
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.
Context:
The Engine Control Unit (ECU) A-9000 monitors fuel rail pressure using the rail pressure sensor B-9004. After a fuel
pressure evaluation, if the ECU A-9000 suspects that the Pressure Relief Valve (PRV) should be open but has not
opened, this fault occur. If this fault is active, the ECU A-9000 has performed step one for achieving limp home mode,
a fuel pressure increase. 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 the PRV should be open but is not open.
Possible failure modes:
1. Faulty PRV, unable to open or partially open.
2. Faulty PRV fuel back-flow, clogged or damaged.
3. Faulty rail pressure sensor B-9004, drifted signal.
4. Faulty ECU A-9000, software.
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