New Holland Workmaster 50, Service Manual

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Electrical systems - FAULT CODES
DTC 134-03-Intake manifold pressure sensor voltage is higher
than expected
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors the intake manifold pressure sensor B-9001. If the ECU A-9000
determines that the intake manifold pressure sensor B-9001 signal circuit voltage is greater than
4.92 V , this fault will
occur. If this fault is active, the intake manifold pressure value will be frozen at the last valid value for a preliminary
failure or jump to a fixed replacement value of
0.98 bar ( 14.21 psi ) if the failure is validated.
Cause:
The ECU A-9000 has determined that the intake manifold pressure sensor B-9001 signal circuit voltage is greater
than
4.92 V .
Possible failure modes:
1. Faulty intake manifold pressure sensor B-9001 wiring, short to a voltage source.
2. Faulty intake manifold pressure sensor B-9001 wiring, open circuit.
3. Faulty intake manifold pressure sensor B-9001, internal failure.
4. 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 6 .
2. Check the intake manifold pressure sensor B-9001 wiring for a short to a voltage source.
Disconnect the engine harness (EN) from the intake manifold pressure sensor B-9001 at connector X-9003 .
With the key in the OFF position, use a multimeter to perform the following voltage check on the engine harness
(EN) side :
From To Value
X-9003 pin 4
Chassis ground
There should be no voltage.
With the key in the ON position, use a multimeter to perform the following voltage check on the engine harness
side :
From To Value
X-9003 pin 4 Chassis ground There should be less than 5.5 V
A. If there is voltage, there is a short to battery or switched battery in the intake manifold pressure sensor B-9001
wiring. Use the appropriate service manual, if necessary, to locate and repair the shorted conductor.
B. If there is no voltage, leave connector X-9003 disconnected and continue to Step 3 .
3. Check the intake manifold pressure sensor B-9001 wiring in the engine harness (EN) for an open circuit.
Disconnect the engine harness (EN) from the ECU A-9000 at connector X-9001 .
With the key in the OFF position, use a multimeter to perform the following continuity check on the engine harness
(EN) side :
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