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The G Sensor monitors any abnormal vertical motion of the vehicle (such as a rough road condition like going over bumps or hitting potholes) and helps the power control module (PCM) determine if the changes in the crankshaft speed are due to engine misfire or are driveline induced.
You can look for a poor connection at the PCM...or a damaged harness. The G Sensor shares PCM 5V and ground terminals with the MAP sensor...a damaged MAP sensor or harness could cause the alarm. And finally, the G Sensor will give correct voltages to the PCM only if it is level and mounted securely to its bracket.
Hello Wayne. When you depress your accelerator pedal it increases the voltage output of the throttle position sensor mounted on the end of the throttle shaft. No one sensor adjusts timing though. The inputs from several sensors are integrated inside the ECU computer. Then the ECU adjusts the timing accordingly. Base timing is taken from the crankshaft position sensor and the camshaft position sensor. Engine temperature, engine load, revs per minute, gear ratio, speed all have the most effect, but there are others that will have slight effect as well. If you have any more questions leave them in "add comments" and I will return your question.