Operation Manual / 4 Product description / TPS44-H.. - TPS52-H..
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8.5 Speed measurement system
No signal or poor signal amplitude of the speed measurement
Turbocharger The speed sensor was acci-
dentally fitted with an additional
gasket.
An enlarged distance between
the sensor tip and the signal-
emitting sealing disc reduces
the voltage amplitude of the
speed signal.
The screw plug for the sensor is fitted with an addi-
tional gasket (copper ring).
For information regarding the disassembly and as-
sembly of the speed sensor, refer to chapter Replac-
ing the speed sensor [➙ 28].
Install the speed sensor without the additional gasket
(copper ring).
Sensor or cable defective Contact an ABB Turbocharging Service Station.
Order new speed sensor (86505) (refer to chapter
Ordering spare parts [➙ 93]).
Replacing the speed sensor [➙ 28].
Table 27: Malfunction of the speed measurement system – No signal or poor signal amplitude
Turbocharger Sensor tip contaminated, since
it is magnetic and can attract
metallic particles. This reduces
the distance to the signal-
emitting sealing disc, which
can lead to amplification of the
noise component and, hence,
to false triggering.
For information regarding the disassembly and as-
sembly of the speed sensor, refer to chapter Replac-
ing the speed sensor [➙ 28].
Dismantle the sensor, clean the sensor tip, and fit the
sensor back on with the specified tightening torque.
Table 28: Malfunction of the speed measurement system – Measured speed too high
Contact ABB Turbocharging Service Station
Table 29: Malfunction of the speed measurement system – Measured speed too low
Other causes of malfunction
If none of the measures described above remedy the malfunction, have the
speed measurement system checked by an ABB Turbocharging Service Sta-
tion.
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