Pin 13 is speed signal - won't have any code or no code flashes. Pin 19 seems to take some cycles to reset. Nothing to worry about - codes should be gone if you're getting no flashes.

One way to check for chain problems is take off the lower oil pan and look for nylon bits of the upper chain guide. A timing chain jump is almost always (perhaps always) accompanied by a shattering of the upper chain guide (usually passenger side), the debris of which ends up in the oil pan in fairly short order. To me it's easier than taking off the value cover. But compression test is a good next step too.

One more thought - if you think it's one cylinder try pulling spark plug wires one at a time. Also with a stethoscope on each injector you can confirm that all are firing.