Warning: High Voltage! Be careful when working with the ignition system.
The electronic ignition system consists of a key, battery, coil, distributor, high-voltage wires and spark plugs (see fig. 5.1).
Fig. 5.1 Location of ignition system components:
1 - key;
2 - candle;
3 - high voltage wire;
4 - distributor;
5 - battery;
6 - coil;
7 - Radio interference suppressor;
8 - main fuse.
The distributor is driven by the camshaft. On early models, the distributor was equipped with centrifugal and vacuum ignition timing regulators. On later models, ignition timing is controlled by an electronic module. Injection engine models are equipped with distributors from Toy o Denso, while carburetor engines are equipped with distributors from Hitachi and Go o Denso. Both units are identical, the main difference being the physical arrangement of components such as the breaker, stator, magnet, and magnetic resistance (see fig. 5.2a and 5.2b).
Fig. 5.2a TOYO DENSO distributor
1 - distributor cap;
2 - cap;
3 - rotor shaft;
4 - breaker housing;
5 - breaker;
6 - cover gasket;
7 - distributor housing;
8 - sensor housing;
9 - coupling;
10 - holder;
11 - pin;
12 - thrust washer;
13 - rubber ring;
14 - vacuum regulator diaphragm;
15 - wire holder;
16 - stopper;
17 - rotor;
18 - lock washer;
19 - thrust plate;
20 - bearing;
21 - thrust washer;
22 - shaft;
23 - centrifugal regulator weights;
24 - springs;
25 - breaker disk;
26 - magnet;
27 - stator;
28 - screw;
29 - magnetic resistance;
30 - rotor (runner).
Fig. 5.2b HITACHI distributor:
1 - pin;
2 - thrust washer;
3 - rubber ring;
4 - body;
5 - oil seal;
6 - vacuum regulator diaphragm;
7 - shaft;
8 - centrifugal regulator weights;
9 - spring;
10 - magnetic resistance;
11 - pin;
12 - primary wire;
13 - rotor (runner);
14 - sealing contact;
15 - lid;
16 - rubber ring;
17 - sensor-interrupter;
18 - screw;
19 - breaker disk;
20 - cap;
21 - thrust washer;
22 - rotor shaft;
23 - magnet;
24 - stator;
25 - thrust plate;
26 - bearing;
27 - coupling;
28 - holder.
Since 1988, injection models have been equipped with a shaft angular position sensor, which is located between the cylinder head and the distributor. These models use a self-diagnosis system for the state of the injection and ignition systems. The self-diagnosis error codes are listed in Chapter 6.
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