Gilera Runner Purejet 2007, Workshop Manual, Page: 137 / 257

COMPONENTS LAYOUT
1 ECU
2 TPS (Throttle Position Sensor)
3 Coolant temperature sensor
A + 12V under panel
B + 12V fixed
The gas valve position sensor (TPS) is an integral part of the throttle body, and therefore it cannot be
removed. The sensor receives 5V power supply (measured electronically) by the ECU. The 5 V power
supply is used for both the TPS sensor circuit and for the coolant temperature sensor circuit. The TPS
sensor is of the dual track type, i.e., with two resistive tracks that generate two opposite signals defined
as TPS1 and TPS2. Signal TPS1 increases with the gas valve opening increase. Signal TPS2 decrea-
ses with the gas valve opening increase. The two signals will therefore be equivalent in a single point,
corresponding to mean opening (50%). The two signals are converted into a percentage value of open-
ing of the gas valve. The dual track system allows a greater control, since signals TPS1 and TPS2 are
compared to each other and to a reference map. When TPS signals missing, or not matching what
expected, are detected, the auto-diagnostic is started and the relevant fault is coded. Faults are reported
according to three priority levels. TPS signals along with the rpm - phase signal are the basis references
for the integrated injection - ignition system functionality.
The check of the gas valve position sensor and relevant circuit can be performed using scooter diag-
nostic testers.
Specific tooling
020460Y Scooter diagnosis and tester
Runner Purejet
pure jet injection
INJ PJ - 137