The engine may fail to start due to an electrically shorted sensor. Some of the sensors may internally short and not blow any fuses. A technician may find no spark and no operation of the fuel injectors in the diagnosis. One way a technician may isolate the defective sensor is by disconnecting sensors one by one to see if the engine starts.
Crank but No Start Condition and No Spark on Mazda B2500
Average mileage: 193,000 (120,000–266,000)
Engine affected: 2.5L 4 Cylinder
7 people reported this problem
1998 Mazda B2500 - 2.5L 4 Cylinder
Truck would turn over fine but not start. Next day, no problem. Next day same problem. Intermittent for about a week,then totally would not start. Had no spark.