1) Ensure that the handbrake is up.
2) Put the gear lever into neutral.
3) Turn the ignition key to MAR. Instrument panel warning lights
will
come on.
4) Wait for warning lights 
to turn off.
5) Wait for the instrument panel warning light
to go out. The hotter the engine is,
the quicker this will happen.
6) Press the clutch pedal down to the floor without touching the accelerator.
7) Turn the key to AVV immediately after the
warning light goes out. If you wait
to long, you will lose the benefit of the work done by the glow plugs.
The warning light
will flash (for approximately 60
seconds) at start-up or during prolonged cranking to signal a fault in the glow
plug heating system. You can use the vehicle as usual if the engine starts but you
should contact a Fiat Dealership as soon as possible to have problem seen to.
If the engine does not start at the first attempt, return the ignition key to STOP before trying to start the engine again.
If with key at MAR warning light 
stays on, turn the key to STOP and then
to MAR again; if the warning light stays on, try with the other keys provided.
If you still cannot start the engine, get in touch with Fiat Dealership.
IMPORTANT
Never leave the ignition key at MAR when the engine is off.
See also:
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