MoTeC M880 - Manual (Page 22)

20 Installation
Sensors
Throttle Position Sensor
The Throttle Position sensor must be a potentiometer type, older switch types
are not suitable. The sensor will produce a voltage proportional to the angle of
the throttle plate.
Throttle sensors generally have a dead band at either end and must be pre-
loaded to avoid the dead band.
The Setup Parameters TPHI and TPLO must be set to indicate the fully
closed and fully open positions. These parameters must be reset any time the
sensor is moved or replaced. It is very important to set these parameters with
the butterfly in exactly the same place each time.
The resistance element inside the sensor may wear due to vibration in high
performance engines which can cause erratic readings. It is best to replace
the throttle position sensor periodically.
Avoid high pressure washing as this may penetrate the seals and damage the
sensor.
For wiring details refer to the appropriate MoTeC drawing.
MAP Sensor
The MAP (Manifold Absolute Pressure) sensor measures Absolute Pressure
(ie. pressure relative to a vacuum).
0 kPa Absolute = Complete Vacuum
100 kPa = 1 Bar = 14.5 PSI
Atmospheric Pressure at sea level is approximately 100 to 102 kPa,
depending on the day.
MAP sensors normally produce a voltage between 0 and 5V, depending on
the pressure.
The pressure sensor may be used to measure the inlet manifold pressure or
to measure the barometric pressure depending on the Load Sensing
arrangement detailed earlier.
The ECU Sensor Setup parameters must be set to indicate the type and
pressure range of the sensor.