I have 04 Grand Cherokee 4.7L with multiple engine codes. Check engine codes P1499, P1495, P0136 and three additional codes in the enhanced DTCs P0622,p1282 and P1388. Starts fine, missing and after it warms up ASD relay starts clicking. From my reseach appears all these codes can be related to open or shorted circuits. Could this be traced to one cause such as power distribution box or PCM?
A couple things to look at - check the harness that runs on the back side of the engine block for any sign of rub-through, also check the harness right off of the leak detection pump (harness as it enters main harness on frame). The LDP is located under the left quarter panel behind left rear wheel.