Bravo-Brava
Electrical system
Preheating control system
55.
CHECKING GLOW PLUGS
If there are difficulties in starting, make sure that all the plugs are working properly. The electrical conti-
nuity of each plug should be checked using a digital ohmmeter (Ohm=0.6 at 20°C). It is advisable to
carry out this check with the plugs fitted to the cylinder head, as the faulty plug may not appear to be
faulty if checked when dismantled from its seating, without the deforming effect caused by the pressure
of assembly. Also check that the engine stop solenoid on the fuel injection pump is not short-circuited,
broken or disconnected.
NOTE Remember that difficulties in starting may be due to an engine with excessively worn seals, a
faulty starter motor or a discharged or badly connected battery.
MAIN OPERATING FAULTS IN THE PREHEATING SYSTEM
Fault
Wait-to-start warning
light does not come on
The engine has difficu-
ly in starting
The engine does not
start
Cause
Warning light bulb blown
Connecting cable between warning
light and pin 5 of the control unit broken
Faulty control unit giving insufficient
preheating times
Electronic control unit not earthed
One or several plugs faulty
Circuit between ignition switch and tag
terminal 3
( + 15)
of control unit broken
Circuit between ignition switch and en-
gine stop solenoid on pump broken
Ignition switch faulty
Remedy
Replace bulb
Clean corroded cable ends or
replace cable
Replace control unit
Check that pin 1 of the
con-
trol unit is earthed
Replace faulty plugs
Restore the connection
Replace ignition switch
Copyright Fiat Auto
157
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