8-VALVE 1.4
ENGINE
FIAT PUNTO TRAINING OUTLINE
Fiat Auto S.p.A.
After Sales Training
4.5.2 Self-diagnosis and recovery
The control unit self-diagnosis system checks correct operation of the system and signals any
anomaly by means of a warning light (MIL) on the instrument board, the colour and ideograph
of which comply with the European normalization standards.
This warning light signals both the engine management faults and the anomalies found by the
EOBD diagnosis strategies.
The MIL warning light operation logic is as follows:
with both the key and the instrument board ON, the warning light illuminates and remains ON
until the engine has been started;
the control unit self-diagnosis system checks the signals from the sensors and compares them
with the permitted limit data.
Fault signalling upon engine starting:
the warning light’s failure to go out after the engine has been started indicates the presence of
an error stored in the control unit.
Fault signalling during operation:
the blinking warning light comes on to indicate possible catalyst damage due to misfire;
the warning lights illuminates and remains ON steadily to indicate the presence of engine
management faults or EOBD diagnosis faults.
The control unit defines each time the type of recovery depending on the broken components.
The recovery parameters are managed by the unbroken components.
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