PIAGGIO 2005 XEVO 400ie, Руководство по ремонту

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15. 12V-12Ah Battery
16 . Starter motor
17 . Start-up remote control switch
20. Starter button
32. Rear light
A. Stop light bulbs
43. Injection load remote control
45. Fuel injector
48. Instrument panel
50. HV coil
51. Immobilizer aerial
52. Decoder
53. Injection ECU
54. Intake air temperature sensor
55. Fuel pump
56. Diagnosis connector
57. Electric fan remote control
58. Engine rpm sensor
59. Stepper motor
60. Engine temperature sensor
61. Throttle valve potentiometer
62. Lambda probe
The coolant temperature sensor is installed on the engine head and provides the indications for the
digital instrument and for the injection.
It is realised with two electrically different sections.
The injection section is realised with an NTC sensor connected to a 5V powered circuit. The resistance
variation causes a variation of the circuit voltage. Such voltage is combined with a temperature value.
By this value, the control unit can manage the engine operation, optimising it for all temperatures.
A failure of this circuit causes the switching on of the injection telltale light and the tripping of the safeties
(among which the electric fan continuous start). In these conditions, the engine works, even though not
in an optimum way, always safeguarding the catalytic converter integrity.
A false temperature value that falls within the range of possible temperatures is a failure very difficult
to manage. This can cause a failure of the safeties and an improper management of the ignition. Such
failure is more easily detected upon the engine start-up.
To check the sensor and related circuit, proceed as follows:
1 - Connect the injection diagnostic tester and select the menu on the "errors" function.
Check whether faults have been recorded regarding the coolant temperature sensor.
YES go to 3 NO go to 2
Injection
XEVO 400ie
INJEC - 234