Fiat Uno Manual

Digiplex (electronic) ignition - checks and adjustments
Ignition system / Digiplex (electronic) ignition - checks and adjustments


1 Without special equipment, any work on the system components should be restricted to the following.

Engine speed sensor
2 The gap between the sensor and the teeth of the flywheel should be between 0.25 and 1.3 mm (0.0099 to 0.0512 in). Any deviation will be due to mechanical damage to the sensor, no adjustment being possible.

TDC sensor
3 The gap between the sensor and one of the TDC reference marks on the crankshaft pulley should be between 0.4 and 1.0 mm (0.016 to 0.039 in).

4 Any deviation will be due to the sensor plate becoming loose. To reposition it will necessitate setting No. 1 piston at TDC which can only be carried out accurately by your dealer using special tools.

Supply circuit and continuity of coil primary winding
5 Connect a test lamp between contacts 11 and 9 of the multi-plug having first pulled it from the control unit.

6 Switch on the ignition, the test lamp should come on. If it does not, either the connection at the positive pole of the control unit or the coil primary winding is open.

Control unit earth
7 Connect a test lamp between contacts 8 and 9 of the multi-plug having first pulled it from the control unit. Switch on the ignition, the test lamp should come on. If it does not, improve the earth connection.

Fig. 4.10 Engine speed sensor gap (Sec 10)
Fig. 4.10 Engine speed sensor gap (Sec 10)

Fig. 4.11 TDC sensor gap (Sec 10)
Fig. 4.11 TDC sensor gap (Sec 10)

Fig. 4.12 Test lamp connected between terminals 11 and 9 of control unit
Fig. 4.12 Test lamp connected between terminals 11 and 9 of control unit multi-plug (Sec 10)

Fig. 4.13 Test lamp connected between terminals 8 and 9 of control unit
Fig. 4.13 Test lamp connected between terminals 8 and 9 of control unit multi-plug (Sec 10)


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