Why? because there aren't nearly as many factors that control whether your fuel pump turns on. Your lack of fuel pressure is your main concern. At this point, I wouldn't worry about the spark plugs just yet. try some of that and let us know what you find. The ECU should still give the OK to start with a bad temp sensor-will most likely give a check engine light, though. try unplugging the engine coolant outlet water temperature sensor (this is the one that tells the computer how hot the engine is). If the temp gauge is always at hot, even after hours of not driving, then the sensor could be bad. bad relay (try switching it out for something less useful, like the A/C relay, if they're the same) faulty wiring (shorting to ground, which would cause a blown fuse) no prime pulse signal from the ECU (could be back to the 'bad ECU' idea above) So you put the key in and turned it to "on"? Did you wait and listen for the fuel pump prime pulse before starting to crank? What have you done to determine that the fuel pump is not getting electricity? cam position sensor is bad (the sensor is on the left side of the valve cover on the 2.0L) otherwise it won't spark even if it's good. did you check more than one plug? Make sure that you hold the spark plug against the engine block or a good ground when checking. I would not just to this conclusion unless it was only 1 coil that wasn't sparking. Without looking at ECU flowcharts (you'd have to work for Mazda to get them), I don't think that the temp gauge pegged at hot would stop the car from starting. This can be one of the most frustrating problems to diagnose.
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