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Home >> Infiniti >> 1990 >> M30 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Optical Ignition System Checks (M30) >> Input Signal Circuit
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Input Signal Circuit

Turn ignition switch off. Disconnect ECU and resistor and condenser harness connector. Using ohmmeter, check continuity between ECU terminal No. 1 and resistor and condenser terminal "c". Continuity should be present. If continuity is not present, repair or replace wiring harness or connectors.