Nissan Repair: 87 pathfinder weak spark, power transistor, ecu

Question
87 pathfinder, very weak spark dtc ,code 21 , driving and just died with no restart approx 250000, replaced coil still very weak spark

Answer
Hi Jim,

You probably have a wiring fault (the circuit between the power transistor unit and ECU is opened). Power Transistor may be faulty, replace if NG. I also spent an hour looking around the web and found nothing that had a different fix than this.