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yugo Workshop Repair Guides


Yugo L4-1300cc 1.3L (1991)

Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Description and Operation > Page 637

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Fig. 9 ECU Injection Signal

2.

If test steps 1a through c of this procedure prove good, and malfunction still exists, proceed as follows: 

a. Connect a suitable oscilloscope to one fuel injector. Signal should be as shown in Fig. 9.
b. If signal is not as specified, check all wires and connections to fuel injectors and injector spring plugs.
c. If all test prove good, and malfunction still exists, replace ECU and retest. 

Powertrain Management > Fuel Delivery and Air Induction > Fuel Injector > Component Information > Description and Operation > Page 637

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