Problem: Vehicle was brought in because the MIL (Malfunction Indicator Light) was on and the engine had a slight misfire.
Details: The technician connected a scan tool and found DTC P0303 – Cylinder three misfire. No other DTCs were found. First, he checked the coil and spark plug. Both components tested fine. Next, he checked the injector trigger signal with a scope. It looked normal. After he was satisfied the problem was not fuel or ignition related, he checked the compression pressure pattern in cylinder #3 with the scope.
Confirmed Repair: In this case, the fuse box in the rear cargo area was defective. The technician replaced the fuse box and the 0 to 5-volt reference returned to the network. This one repair fixed all of the issues the customer was experiencing.