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Table 7: Malfunction table for spool position sensor
Malfunction
Occurrence possible
Pro-
0-km
to
Sensor
x
x
supplies
incorrect
signal
Sensor does
x
x
not supply
a signal
Sensor does
x
x
not supply
a signal
Sensor
(x)
x
supplies
incorrect or
x
no signal
x
x
14 Troubleshooting
The Table 7 is intended to support troubleshooting. This table is not exhaustive.
Issues may occur in practice that are not listed here.
A control unit to which the sensor is connected can often detect errors by
means of the sensor signal. What type of errors are detected depends on the
hardware of the control unit used and the software running on the control unit.
The indication or display of an error, e.g. via a display or a diagnostic tool,
depends on the machine concept. If necessary, observe the instruction manual
of the control unit manufacturer.
14�1 Malfunction table
Possible cause
Operation
Mixing up the connection lines
when connecting the sensor to the
superior control system.
x
Sensor was mechanically damaged
from the outside during operation.
x
Incorrect or faulty voltage supply:
- Sensor supply voltage is missing.
- Sensor supply voltage is too low.
x
Humidity has entered the wiring
harness or the sensor.
The input resistances RPU and/or
RPD of the control unit are either
too large (high resistance) or too
small (low resistance).
x
The ground line of the sensor
is not connected to the sensor
ground of the control unit.
There is a "potential shift" due to
different grounds between sensor
and higher-level control
Troubleshooting | PSM
Remedy
Check the wiring and/or the wiring harness both
at the sensor connector and at the superior control.
Check the sensor for obvious damage:
Cracks in the housing, cracks in the connector
chamber, damage due to external mechanical
influence.
Measure the supply voltage at the contacts of
the sensor and make sure that all contacts in the
mating connector are correctly fitted and latched.
Make sure that the mating connector is connected
to the sensor until latching.
The seals of the wiring harness connector are
defective or the cable/sensor has been damaged.
Check whether the sensor is operated within
its "operating limits" and make sure that the
input resistances and the input capacitances of
the connected control unit are within the limits
specified in data sheet 95190.
Make sure that the ground of the sensor is
connected to the respective ground of the control
unit with a low resistance. Measure the connection.
RE 95190-B/2021-08-12, Bosch Rexroth AG
21/24
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