The throttle position sensor (TPS) on a Mazda Protege delivers information about the current position of the throttle to the powertrain control module (PCM). In turn, the PCM adjusts the spark timing and fuel mixture to better accommodate engine load changes. The TPS may require readjustment if the module's voltage falls out of specification range, resulting in delayed throttle response. Adjusting the TPS takes a relatively short amount of time and requires only basic tools to complete the task.
Locate the TPS on the throttle body near the air intake hose. Verify that the throttle valve is closed. Unplug the connector from the throttle position sensor.
Measure the resistance between the TPS connector terminals "A" and "C" with a multimeter. The TPS should read between 4.0 and 5.5 volts. If the TPS reads outside of this range, the sensor must be adjusted.
Loosen the throttle position sensor retaining screw with a Phillips-head screwdriver. Adjust the TPS by moving it back and forth until the voltage is between 4.0 and 5.5 volts.
Hold the TPS in place and tighten the retaining screw with the Phillips-head screwdriver. Measure the TPS with the multimeter once more to make sure the new settings have been achieved.
