Repair Manual

17
IGNITION AND INJECTION
17 - 23
WORKING MODE
IN CASE OF INTERVENTION ON THE MONO-MOTRONIC INJECTION
SYSTEM
Prior to the engine start up one should check the correct connection of the battery; the battery
should be well loaded and its terminals should be cleaned and well tightened up.
The maximum supplying voltage of the system should not excel 15 V.
The battery should be disconnected only after stopping the engine, the contact key being on
the position “St” (contact closed).
The electronic control unit can be disconnected only after closing the contact and
disconnecting the battery terminal (-).
For checking the cylinders compression one should interrupt the power supply of the relays
(R
1
– R
2
) of the injection system.
The ignition system should be disconnected, turning the contact key on the position “0”, prior
the interventions at the ignition system.
For instance:
- changing the engine system components
- connection to the engine tester
- connection to the checking bench
The cables in the engine compartment should be well placed in order not to be in
contact with the hot areas or with the moving parts of the engine.
In case of charging the battery form a redresser, the battery should be first disconnected from the
electric system of the vehicle.
WARNING !
1 – Only fuel without lead should be supplied, otherwise the catalytic converter will
be damaged. Use only fuel or oil additives recommended by the constructor.
2 – You should avoid bumping the catalytic converter
3 – The engine should be fit for working with the catalytic converter under normal
conditions (injection, ignition). In case of miss-ignition, supplying problems and power
losses stop the car, for avoiding the overheating of the catalytic converter; the later can
also be damaged by the too extended use of the starter in case of difficult start up.
4 – In case that fuel with lead is used by mistake, prior to changing the ë rod or the
catalytic converter one should refill the tank twice with no-lead fuel.
5 – Taking into consideration the high pressure of the fuel supplying system, all the
joints between pipes and hoses should be well tightened up with the adequate gaskets,
in order to avoid the possible fuel losses, which might lead to vehicle fire hazard.
DIAGNOSTIC
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