The 2.4L engine's unique ignition system has the ignition coils situated directly over each plug. No spark plug wires are used.
If a coil is replaced on the 3.1L engine, it may not be numbered like the factory coil. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your guide to reflect how your engine is wired.