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How To Fix Polaris RZR Throttle Position Sensor Issues

How To Fix Polaris RZR Throttle Position Sensor Issues

With its reputation for conquering some of the toughest trails out there, it’s no surprise that the Polaris RZR is the go-to side-by-side for many motorheads (source). But like any other vehicle, the RZR can have its share of issues, such as with the throttle position sensor. So, how do you fix Polaris RZR throttle position sensor issues?

You can fix a Polaris RZR throttle position sensor issues by checking the sensor, connectors, and wiring for corrosion or damage and then cleaning, repairing, or replacing them if necessary.

This article will describe a few easy fixes for a faulty throttle position sensor on a Polaris RZR. Let’s get started!

1. Inspect the Throttle Position Sensor

The first thing you should do if you’re having throttle position sensor issues is to inspect the sensor itself. You can do this by removing the sensor and checking for any damage or debris. If the sensor is damaged, you’ll need to replace it. 

When checking the sensor, pay particular attention to:

  • The electrical connector: This is where the signal from the sensor is sent to the engine control unit. Ensure the connector is securely connected and there’s no damage or corrosion.
  • The wiring: Check for any signs of damage or wear on the wiring leading to the sensor. If there are any breaks or frayed wires, they will need to be repaired or replaced.
  • The mounting: You’ll find the throttle position sensor fixed onto the throttle body itself. Ensure it’s securely in place and that there are no loose wires or other debris.

Here’s a quick video from Ratchets And Wrenches that demonstrates how to test your throttle position sensor using a multimeter:

How to Test a Throttle Position Sensor (TPS) - With or Without a Wiring Diagram

Note: If you need a multimeter for testing your sensor, I recommend the AstroAI Multimeter Digital Multimeter (link to Amazon). It’s a versatile and affordable tool that will also come in handy for all sorts of tasks around the garage, including testing voltage, current, and resistance.

2. Check the Connectors and Wiring for Corrosion 

Another issue that can make the throttle position sensor malfunction is corrosion (source). There are several areas where corrosion can build up, such as:

  • The connector: Corrosion around the connector can make it difficult for signals to flow between the sensor and the ECU.
  • The wiring: The wires can also become corroded, which can cause shorts and lead to inaccurate readings from the sensor.
  • The ground wire: The ground wire provides a path for the electrical current to flow. Corrosion in the ground wire can cause problems with the transmission of the signal from the sensor.

If any of these areas are corroded, it is important to clean them off before continuing to use the sensor.

3. Check for a Faulty ECU

The ECU (engine control unit) – or power control module – is responsible for processing signals from the throttle position sensor (source). If the ECU is damaged, it may not be able to process these signals correctly, which can cause glitches with the sensor.

You’ll need to have the ECU repaired or replaced if it’s damaged. To check for a faulty ECU, you’ll need to consult your vehicle’s service manual.

Once you’ve located the ECU, you’ll want to check for signs of physical damage, which include:

  • Cracks in the casing: These can be caused by physical impact or overheating.
  • Loose or damaged connectors: Check the electrical connectors for any signs of damage or wear.
  • Missing or damaged chips: If you see any missing or damaged chips, the ECU will need to be replaced.
  • Water damage: This is a common issue, especially if the ECU is located in the engine bay. Rust and corrosion are common indicators of water damage.

If you notice any of these signs of damage, consult a qualified mechanic.

4. Replace the Battery

A weak or dead battery is another common cause of throttle position sensor malfunctions. The battery provides power to the ECU, and if it’s not working properly, the ECU may not be able to process the signal from the sensor correctly.

To check if the battery is the cause of the issue: 

  1. First, make sure the battery’s voltage is within the normal range of 12 – 14 volts. Use a voltmeter to measure the voltage. A reading below 12 volts means that the battery should be recharged.
  2. Next, check the terminals of the battery for corrosion. If they’re corroded, they may need to be cleaned or replaced. 
  3. Finally, check the cables that connect the battery to the rest of the car. Make sure they’re tight and free of corrosion. 

Note: If you need to change the battery, here are a few guidelines to follow: 

  • Make sure to replace it with the right battery. Check your owner’s manual to confirm the correct battery for your vehicle.
  • Choose the right type of battery. You could go with either the sealed lead-acid battery (which is relatively easy to maintain) or the flooded lead-acid battery (which may need occasional touch-ups, such as adding water to the cells.)
  • Follow the instructions in your service manual. Every car is different, so it’s important to follow the instructions in your service manual when changing the battery.
  • If you’re not comfortable changing the battery, take it to a qualified mechanic. That way, you can be sure it will be done properly.

5. Update the Control Module’s Software 

Software issues may also be the reason your sensor isn’t working correctly. The software that controls the sensor may be out of date or may have become corrupt. 

To update the software, you’ll need to consult a qualified mechanic or dealership. They’ll be able to update the software for you and make sure it’s working properly.

6. Replace the Throttle Position Sensor 

If none of the other solutions work, you may need to replace the throttle position sensor altogether. That’s a job that should be done by a qualified mechanic.

Here’s what to expect when you take your car to a mechanic to have the throttle position sensor replaced: 

  1. The mechanic will start by checking the codes stored in the ECU. They’ll use a scanner to read the codes and determine which ones are related to the throttle position sensor.
  2. Next, they’ll check the wiring harness for any signs of damage.
  3. After that, they’ll test the sensor to see if it’s working properly.
  4. Finally, they’ll replace the sensor and clear the codes from the ECU.
  5. Once the new sensor is installed, the mechanic will test it to ensure it works properly. 

7. Take Your Polaris RZR to a Qualified Mechanic

If you’re looking for a time-saving solution that requires little effort, then the best thing to do is to take your Polaris RZR to a qualified mechanic. They’ll be able to diagnose the problem and find the right solution for you.

Besides, if you’re not comfortable working on your RZR, it’s always best to leave it to a professional. That way, you can be sure the job is done right, and you won’t have to worry about making things worse.

Wrap Up

Throttle position sensor issues are common on Polaris RZRs. If you’re having throttle position sensor issues, try each solution in this article until you find the one that works for you. 

And if you’re not comfortable working on your RZR, take it to a qualified mechanic or dealership.

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