New Holland WorkMaster 50 Service Manual page 755

Electrical systems - FAULT CODES
DTC 137-02-Fuel pressure relief valve reached maximum allowed
opening count
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 the fuel Pressure Relief Valve (PRV). If the ECU A-9000 determines
that the PRV has exceeded its maximum open count, 50 times, this fault will occur. If the PRV has opened more than
50 times, the PRV must be replaced. 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 has opened more than 50 times.
Possible failure modes:
1. Faulty fuel metering unit Y-9000, stuck open.
2. Faulty rail pressure sensor B-9004, drifted signal.
3. Faulty PRV, opening pressure too low.
4. Faulty fuel back-flow, clogged or damaged.
5. Faulty ECU A-9000, software.
47866583_ 02/12/2015
55.12 [55.DTC] / 34