Troubleshooting A Throttle Positioning Sensor

by Rosa Koch

A throttle positioning sensor is a device used for providing information to the engine computers in vehicles. These computers will, in turn, use the data in giving drivers the right amount of power they need. However, at times, sensors tend to suffer complications and result to stumbling acceleration or engine hesitation.

Troubleshooting such devices would entail that their location first be searched throughout the vehicle compartment. Although, usually, they are located in the exteriors of carburator plate shafts or throttle bodies. They often come in small boxes with some wires out their electrical connectors.

Before you start troubleshooting though, make sure that these electrical connectors are all unplugged. One thing you need to test the device for is supply voltage. For this, attach both the negative leads and the positive ones to the terminal references of the voltage wires. Doing so will give you the voltage readings.

Checking whether the TPS can send signal voltages would also be a common troubleshoot phase. The process would involve inserting pins on signal voltage wires and ground wires then connecting these to voltmeter probes. Doing so will give owners the meter readings required. In case none appears, then the TPS may need to be repaired or replaced.

Consider testing the resistance of the device. Connect the wire contacts and sensor supplies to your ohmmeter probes. Try opening and then closing your throttle plates manually for the resistance. If you think the reflected amount is too drastic, then replace your TPS.

Sometimes, you may find that sensors do not really need to be repaired or replaced. Adjusting them might just suffice. Make sure that you consider this first so you can save yourself from the unnecessary costs of unneeded fixing.

Loosening the mounting screws of a throttle positioning sensor will need to be done in case adjustments are necessary. Referencing the ohmmeter, sensors must then be rotated just until one has obtained the desired resistance. The mounting screws should be tightened again after this.

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