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Yugo L4-1300cc 1.3L (1991)

Powertrain Management > Ignition System > Ignition Control Module > Component Information > Testing and Inspection > Output Transistor Signal Test > Page 709

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Ignition Control Module: Testing and Inspection
Output Transistor Test

Refer to Fig. 5 when performing the following procedure.

Fig. 5 Bosch Motronic Electronic Engine Control System Terminal Identification

1.

Using a suitable digital ohmmeter, check resistances are as follows: 

a. Probe output transistor terminal 4 with positive lead of ohmmeter and terminal 2 with negative lead of ohmmeter. Resistance should be

690-790 ohms. Reverse ohmmeter connections, resistance should be 720-820 ohms.

b. With output transistor blue wire disconnected from ignition coil negative terminal, probe transistor terminal 4 with positive lead of ohmmeter

and the end of the blue wire with negative lead of ohmmeter. Resistance should be 670-770 ohms. Reverse ohmmeter connections, resistance
should be infinite.

c. With output transistor blue wire disconnected from ignition coil negative terminal, probe transistor terminal 2 with negative lead of ohmmeter

Powertrain Management > Ignition System > Ignition Control Module > Component Information > Testing and Inspection > Output Transistor Signal Test > Page 709

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