Workshop Manual

REG. CODE
1-5302-509
MODEL N°
50778
DATE OF ISSUE
10.06.99
REVISION 00
DATE
10.06.99
ENDORSED
COMPILER TECO/ATI
62
IGNITION
XII
152
151
This warning applies to engines LGW 523 and 627
Take care to fix the harness wires in the correct way to
prevent coils from forming.
Electromagnetic fields could create abnormal voltage values
leading to faulty operation in the ignition system.
LGW 627 ignition system
Components
1 Sensor with Hall effect
2 Electronic module serial N° 122.2193.109 (see fig. 156)
2 Electronic module serial N° 122.2193.114 (see fig. 158)
3 Coil
4 Coil
5 Wire for cylinder N° 1 spark plug
6 Wire for cylinder N° 2 spark plug
Main components of the LGW 627 ignition system (fig. 152)
Foreword : A phase sensor and two high voltage coils with one
output are activated.
1 Timing pulley of the camshaft with lamination (in configuration 1
for engine LGW 627 at 90°) to transmit to the sensor with Hall
effect
2 Electronic module
3 Cover situated on the camshaft on the timing system side with
the Hall effect sensor installed
4 Coils
Apply a 6 Nm driving torque to remount the enabling (switching
plate).
Operating principle
In engine LGW 627, the two laminations 1 are at 90° to each other.
Module 2 waits for the engine to accomplish a complete starting
cycle (two crank shaft turns) to set the signal from laminations 1 in
phase with the cylinders.
The starter motor must therefore remain engaged for about 1
second before the first spark is produced.
Following this, module 2 will alternate its control of coils 4 on each
lamination passage.