APRILIA SCARABEO 500 - 2008, Service Station Manual

Page: 236 / 324

Possible Cause Operation
Ignition advance
Fuel supply Fuel pressure (low)
Injector flow (low)
Injector seal (poor)
Correctness of the parameters Coolant temperature
Intake air temperature Stepper throttle valve posi-
tion (steps and actual opening)
Cleaning the auxiliary air pipe and air filter effi-
ciency throttle valve
Engine stops at idle
ENGINE DOES NOT HOLD IDLING/ IDLING IS UNSTABLE/ IDLING TOO LOW
Possible Cause Operation
Faults detected by self-diagnosis Pump relay
HV coil
Injector
Revolution timing sensor
Air temperature
Coolant temperature
Ignition efficiency Spark plug
Ignition timing
Correctness of the parameters Throttle valve position sensor
Stepper
Coolant temperature sensor
Intake air temperature sensor
Intake system cleaning Air filter
Diffuser and throttle valve
Supplementary air pipe and Stepper
Intake system seal (seepage) Intake manifold - head
Throttle body - manifold
Intake manifold
Filter housing
Fuel supply (low pressure) Fuel pump
Pressure regulator
Fuel filter
Injector flow
Engine does not rev down
ENGINE DOES NOT RETURN TO IDLING/IDLING TOO HIGH
Possible Cause Operation
Faults detected by self-diagnosis Pump relay
HV coil
Injector
Revolution timing sensor
Air temperature
Coolant temperature
Ignition efficiency Ignition timing
Correctness of the parameters Throttle valve position sensor
Stepper
Injection
SCARABEO 500
INJEC - 236