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yugo Workshop Repair Guides


Yugo L4-1300cc 1.3L (1991)

Powertrain Management > Ignition System > Relays and Modules - Ignition System > Ignition Control Module > Component Information > Testing and Inspection > Output Transistor Signal Test > Page 718

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Fig. 6 Output Transistor Control Pulse

c. Using an oscilloscope, check control pulse at terminal 4 of output transistor is as shown in Fig. 6 with engine cranking and running.
d. If no pulse exists and connections and wiring check OK, replace ECU.
e. If all possible faults are eliminated and no spark exists, perform test procedures described under ``Output Transistor Test.'' 

Powertrain Management > Ignition System > Relays and Modules - Ignition System > Ignition Control Module > Component Information > Testing and Inspection > Output Transistor Signal Test > Page 718

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