Mazda generally do not fit a valve to test the fuel pressure. You would need to fit an in-line (T fitting)check point to check for good fuel pressure from pump.
Tapping the CMP should not affect the engine. I would replace the sensor and/or check the wiring if you feel it is playing a part in your non start issue
Camshaft Position Sensor
The Camshaft Position (CMP) sensor detects camshaft angle at 180-degree intervals (4-cylinder) or 120-degree intervals (6-cylinder) and sends a signal to the PCM. The CMP sensor also detects cylinder No. 1 TDC (4-cylinder) or No. 1 and No. 4 TDC (6-cylinder) and sends a signal to the PCM. The CMP signal is used for fuel synchronization. For CMP sensor location, see CAMSHAFT POSITION SENSOR LOCATIONS table. On MPV, the CMP sensor pulses once per camshaft revolution.
Monday, July 19th, 2010 AT 4:13 AM