New Holland WorkMaster 50 Service Manual page 892

Electrical systems - FAULT CODES
DTC 299-04-Turbocharger boost pressure is lower than expected
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors boost pressure using the intake manifold pressure sensor B-9001.
If the ECU A-9000 determines that boost pressure is lower than expected, this fault will occur. For more information
regarding the troubleshooting of an under-boost condition, see Turbocharger - Troubleshooting (10.250).
Cause:
The ECU A-9000 has determined that boost pressure is lower than expected.
Possible failure modes:
1. Faulty intake plumbing, boost leakage.
2. Faulty air filter, clogged.
3. Faulty wastegate pressure modulator valve Y-9008, if applicable.
4. Faulty boost pressure accumulator, if applicable.
5. Faulty wastegate, sticking.
6. Faulty turbocharger, low efficiency.
7. Faulty intake manifold pressure sensor B-9001, drifted signal.
8. Faulty ECU A-9000, software.
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