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1 The throttle position sensor (IPS) is
mounted on the outside of the right-hand
carburettor and is keyed to the throttle shaft.
The sensor provides the ignition control unit
with information on throttle position and rate
of opening or closing.
2 When the ignition is first switched on, or
while the engine is running, the throttle
position sensor performs its own selfdiagnosis
in the event of failure or faulty
wiring. When a fault occurs, the tachometer
will be seen to display zero rpm for 3 seconds,
then 3000 rpm for 2.5 seconds, then the
actual engine speed for 3 seconds,
whereupon it will repeat the cycle until the
engine is switched off.