New Holland WorkMaster 50 Service Manual page 741

DTC 134-00-Intake manifold pressure sensor drifted high
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors boost pressure using the intake manifold pressure sensor B-9001.
Boost pressure is compared to environmental pressure by the ECU A-9000. If the ECU A-9000 determines that the
difference between measured boost pressure and environmental pressure is greater than 0.1 bar (1.5 psi), this fault
will occur.
Cause:
The ECU A-9000 has determined that boost pressure is greater than environmental pressure by 0.1 bar (1.5 psi).
Possible failure modes:
1. Faulty intake manifold pressure sensor B-9001, internal failure.
2. Faulty ECU A-9000, software.
Solution:
1. Verify fault is present and active.
Use the Electronic Service Tool (EST) to check the status of this fault.
A. If the fault is present and active, continue with Step 2.
B. If the fault is no longer present or in an inactive state, the fault may be intermittent and not currently active.
Continue with Step 4.
2. Use the Electronic Service Tool (EST) to check the status of following related faults:
DTC 134-03 - Intake manifold pressure sensor voltage is higher than expected
DTC 134-04 - Intake manifold pressure sensor voltage is lower than expected
A. If any of the listed faults are active, diagnose them first and then return to this fault.
B. If none of the listed faults are active, continue to Step 3.
3. Replace the intake manifold pressure sensor B-9001.
Use the EST to verify the status of this fault, .
A. If the fault is no longer active, return the machine to service.
B. If the fault is still active, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
4. Visually inspect the relevant harnesses and connectors for damage, bent or dislocated pins, corroded terminals,
or broken wires. Verify that the connectors are fully installed. Flex the harnesses involved to reveal intermittent
breaks or shorts in the wiring concerned. Operate the machine while you monitor the display.
A. If you find damage or the display indicates other than normal display readings, then repair the damage discov-
ered during the inspection or locate and repair the other than normal display condition and verify that the error
has been resolved.
B. If you do not find damage and the display indicates only normal readings, then erase the fault code and continue
operation.
Electrical systems - FAULT CODES
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