Laser FWD L4-1753cc 1.8L SOHC (1993)
Fuel Injector: Initial Inspection and Diagnostic Overview
Harness Inspection
Step 1
Step 2
Actuator Inspection
Checking Operation Sound
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Using a sound scope, check the operation sound ("chi-chi-chi") of injectors during idling or during cranking.
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Check that as the rotating speed increases, the frequency of the operating sound also increases.
Note: If the injector you are checking is not operating, you may hear the operating sound of the other injectors.
Note: If no operating sound is heard from the injector being checked, check the injector drive circuit.
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If there is nothing wrong with the circuit, a defective injector or engine control module is suspected.