Ground Circuit Test (Elantra)

Turn ignition off. Disconnect both ignition coils 2-pin harness connectors, see Figure. Also disconnect ECM 81-pin harness connector, see Figure. Measure resistance between ignition coil-1 connector terminals No. 1 and ECM connector terminals No. 4 (Green wire). Also measure resistance between ignition coil-2 connector terminals No. 1 and ECM connector terminals No. 5 (Yellow wire). Resistance should be one ohm or less. If resistance is not as specified, repair open or short circuit (in Green or Yellow wire) between suspect ignition coils and ECM. For circuits identification, see WIRING DIAGRAMS article.