Be aware that each ignition coil fires two spark plugs at the same time, and anything that breaks that circuit will cause both plugs to have a loss of spark. That includes a single bad spark plug wire.
I have a Chrysler DRB3 scanner for my vehicles. Most aftermarket scanners have a test mode similar to Chrysler's "ATM", (automatic test mode), that allows you to command the engine computer to fire the ignition coils without the engine running. See if you have that capability, then check for spark on all four cylinders. If you do, that proves the ignition coils, engine computer, and all the wiring are okay. At that point I would be suspecting a problem with the crankshaft position sensor.
The reason I asked about the number of camshafts is there has been a common problem that causes a loss of spark from one ignition coil, but as far as I know, it only applies to the single-cam engine. The fault code would be "cam and crank sync".
Under your "inputs and outputs" screen, look for the crankshaft position sensor and camshaft position sensor, and see if they are listed with an indication as to whether their signals are showing up during cranking. Mine lists them with a "no" or "present". If either sensor is shown as sending no signal, or it is intermittent, that is the circuit to diagnose. Those sensors often do not set a diagnostic fault code simply from cranking the engine. They set when a stalled engine is coasting to a stop. If the battery was disconnected, that would erase those codes, then they may not set again. That is why the live data screen on your scanner is the best thing to have.
Also, consider that the engine computer will shut the engine down if the timing belt jumps two teeth, to protect the valves. At one tooth off, it is supposed to turn on the "check engine light". At three teeth off, valves could be hit and bent by the pistons. Two teeth off is real close to still running, and it can be right on the borderline where the computer cannot decide if it should stop firing injectors and ignition coils. The symptom often is a failure to fire just one coil.
Thursday, January 5th, 2017 AT 3:24 PM