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Home >> Jeep >> 2006 >> Grand Cherokee Laredo, 4.7 N, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Emissions System >> Emissions >> Operation >> Non-Monitored Circuits >> Secondary Ignition Circuit
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Secondary Ignition Circuit

The PCM cannot detect an inoperative ignition coil, fouled or worn spark plugs, ignition cross firing, or open spark plug cables.

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