The Throttle Position Sensor (TPS) on the Honda is mounted onto the firewall on the driver's side of the engine next to the master brake cylinder. The TPS is designed to read the throttle position and adjust the throttle as needed to allow the Honda engine to run properly. Occasionally, the electro-mechanical parts can wear out or need to be adjusted to keep the vehicle running efficiently. You can adjust the TPS in just a few minutes.
Turn the engine on and let it warm up for about five minutes. Shut the engine off and locate the AWS hose in the back of the carburetor attached to the curved inlet pipe near the throttle arm.
Remove the AWS hose from the inlet pipe to access the TPS sensor on the firewall. Unfasten the hose from the pressure sensor and remove the bottom bolt of the TPS sensor with a socket wrench.
Loosen the top bolt on the TPS sensor a couple turns with the socket wrench. Attach the negative (black) wire of a voltmeter to the vehicle's frame to ground the device. Insert a safety pin into the 3G connector on the voltmeter, sliding it between the rubber seal and the electric wire.
Attach the positive (red) wire of the voltmeter to the safety pin and turn on the ignition switch without cranking the engine. Check the closed and open voltages on the meter.
Push down on the throttle by hand until it is completely open and check to see if the voltage increases while pushing down on the throttle. Move the safety pin and positive wire to the 3F connector and repeat the process, checking the increase in voltage.
Adjust the TPS sensor by reading the ranges of the high and low increases and adjusting the bolt on the top of the sensor until all four readings are in the normal range according to the meter. Secure the bolt at the bottom of the TPS sensor and attach the hoses to the sensor and inlet pipe.
