Fiat 1998 Marea Weekend, Service Manual

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Braking system
Marea - Marea Weekend
Anti-lock brakes
33.
Warning light signalling A.B.S. failure
1. ABS warning light
2. Braking system failure warning light
P4F0SBD01
With the ignition switch in the ON position, the control unit carries out a static self-control cycle during
which the warning lights (1 and 2) come on.
After about 2 seconds (if the control system does not detect any faults), the warning lights go out.
If the warning light (1) remains on, this means that there is a fault in one or more of the A.B.S. system
components. Under these circumstances, the A.B.S. system is disabled but the EBA system continues
to operate, therefore the braking force continues to be distributed like on a conventional braking system.
If the warning light (1) does not come on, (with the ignition switched on) then the cause of the problem
should be sought in the LED of the actual warning light or in the electrical connection.
At around 6 kph the A.B.S. system is switched on.
When driving at a speed of about 6 kph, the system test cycle starts to operate. If the system component
responses are positive, then the warning light remains switched off. If the response is negative, then the
warning light comes on and the A.B.S. system is automatically deactivated. Braking takes place con-
ventionally.
When the battery is not fully charged, the warning light may come on and the A.B.S. is excluded such as,
for example, in town when driving at very low speeds with all the consumers switched on.
EBA function failure signal
A failure of the EBA function is signalled by the ABS warning light coming on at the same time as the
braking system failure warning light (2) in the instrument panel.
The warning light (2) in the instrument panel coming on not accompanied by the ABS warning light (1)
coming on does not indicate a malfunction of the EBA, but one of the other faults signalled (low brake
fluid level, handbrake applied).
If there is a fault in the EBA, the distribution of the brake force between the front and rear axles tends to
fail with the consequent risk of the rear wheels locking during braking in certain conditions.
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