Checks- Adjustments And Repair Operations On The; Bosch Motronic Me 3.1 Injection/Ignnition System In Addition To The Fault Diagnosis - Fiat Bravo Service Manual

Hide thumbs Also See for Bravo:

Table of Contents

Bravo- Brava 9

CHECKS - ADJUSTMENTS AND REPAIR OPERATIONS ON THE BOSCH MOTRONIC ME 3.1

INJECTION/IGNITION SYSTEM IN ADDITION TO THE FAULT DIAGNOSIS

WHEN WORKING ON A VEHICLE EQUIPPED WITH A MOTRONIC

SYSTEM, OBSERVE THE FOLLOWING PRECAUTIONS:

- do not start up the engine with the terminals for the electrical connections not properly con-

nected or slack at the battery poles:

- do not use a rapid battery charger to start the engine:

- never disconnect the battery from the on board system with the engine running;

- when recharging the battery, disconnect it first from the system;

- if the vehicle goes into a drying oven after painting, at temperatures in excess of 80 "C, then the

injection/ignition electronic control unit must be removed first;

- never connect or disconnect the electronic control unit multiple connector with the ignition

switch in the ON position;

- always disconnect the negative battery lead before carrying out electrical welding on the vehi-

It should be remembered that this system has a memory which is always supplied (stand-by

memory) which contains all the self-adjustment figures. If the battery is disconnected then this

information is lost and can only be acquired again after a certain length of time so this operation

should be carried out as infrequently as possible.

If the engine control unit or the motorized butterfly casing is being replaced, the self-learning procedure

must be carried out for the return spring inside the butterfly casing and m a x i m u m / m i n i m u m motorized

butterfly valve angular positions.

Checking the resistance

The resistance of the solenoid valve can be

measured by disconnecting the connector and

connecting an ohmmeter as illustrated in the

Resistance: 17.5-23.5 ohm at 20 °C

Wiring connector

The numbers indicate the corresponding c o n -

trol unit pins

INJECTION/IGNITION