Gilera Runner Purejet 2007, Workshop Manual, Page: 116 / 257

Dirty fuel filter
Fuel supply vent clogged
5. Ignition system
Faulty spark plug
Faulty coil
Faulty screened cap
6. Suction circuit
Air filter dirty
7. Others
Incorrect reset of the gas valve position sensor
2 Injection system faults may be caused by loosened connectors. Make sure that all connections are
efficient.
Check the connections as follows:
1. check that the terminals are not bent.
2. check that the connectors are properly engaged.
3. check if the fault can be fixed by slightly vibrating the connector.
3 Check the entire system before replacing the ECU
If the fault is fixed by replacing the ECU, install the original ECU again and check if the fault occurs
again.
4 For troubleshooting, use a multimeter with internal resistance of more than 10 Ohm / V.
Inappropriate instruments may damage the ECU.
The preferred instruments have a definition of more than 0.1V and 0.5 Ohm , precision must be more
than ±2%.
autodiagnosis
Self-diagnosis
The injection system is provided with a self-diagnostic function.
The system recognises faults by analysing and comparing electric signals. This recognises a missing
signal and an unexpected signal.
Depending on the case, the ECU can use base parameters set in the program, thus allowing an ac-
ceptable operation of the engine. Otherwise it may limit the engine performance to force idle operation
only.
For faults relating to the essential system components, vehicle safety is ensured, although engine per-
formance cannot be guaranteed. For example, when a fault to the ignition system is detected, injection
is also disabled, thereby safeguarding the catalyser.
The auto-diagnostic system also warns the driver. Faults are reported according to three priority levels:
pure jet injection
Runner Purejet
INJ PJ - 116