Spark Plug Anti-Flood; Tps/Isc Reset - KYMCO Downtown 350i Repair Manual

6.Fuel System
Downtown 350i

Spark Plug Anti-Flood

When no failure code occurs and pressing starter switch repeatedly can still not
start the engine the spark plug maybe fouled and there may be a flooded engine.
Perform the spark plug anti-flood to purge the fuel in the engine.
Make sure the battery voltage is greater than 12 V.
1. Close the throttle, turn the ignition switch to ON.
2. Open and hold the throttle fully, pressing starter switch more than 3 seconds.

TPS/ISC Reset

● If the throttle is being moved when the throttle body or TPS is installed it can
cause a hard to start engine or incorrect idling speed.
● ISC has a motor inside, which controls air bypass valve to obtain a smooth
idling speed. The ECU may record the incorrect ISC position when the ECU or
the throttle body has been reinstalled. It can cause
engine stop, hard to start engine or rough idling speed.
The throttle position sensor (TPS) and idle air bypass valve (ISC) have to be
reset when throttle body, MAP, TPS, ISC or ECU have been reinstalled.
TPS/ISC RESET PROCEDURE
1. Put the side stand up and engine stop switch is at "RUN".
2. Turn the key to the OFF position.
3. Fully open the throttle.
4. Turn the key to the ON position.
5. Release the throttle after waiting for eight seconds.
6. Turn the key to the OFF position.
7. Turn the key to the ON position.
8. TPS and ISC have been reset successfully. If fail to reset, repeat the steps
from 1 to 8.
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