Diagnostica

DIAGNOSTICA

The system is equipped with an autodiagnostics function which is designed to verify an irregular state for the following components:

Actuators
injectors
coils
charcoal filter solenoid valve
engine idle adjustment actuator
electric fuel pump relay
climate control relays (if fitted)

Sensors
engine speed sensor
vehicle speed sensor
Lambda sensor
butterfly position sensor
coolant temperature sensor
detonation sensor

Location of diagnostic connector

If a fault is detected and confirmed, it is permanently stored in the memory and the relevant sensor is excluded from the system until normal operation has been restored.

The detection of a confirmed fault usually involves the warning light in the dashboard coming on: it goes out when the fault conditions no longer exist.

NOTE During starting, the warning light is:
- on for about 4 seconds,
- off for 0.1 seconds;
- kept on/off permanently according to whether or not "permanent" errors are present.

Working with the diagnostic equipment, it is possible to carry out a complete fault diagnosis of the system, which consists of three stages:

• display of a series of functional parameters (with the engine switched off or running);
• display of the errors and their cancelling;
• activation of certain actuators (active diagnosis).

Recovery strategy

If a fault is detected with the sensors/actuators, the control unit, where possible, replaces the missing information, reconstructing it using software (recovery) to allow the opertion of the engine.