How to Test Harley Twist Grip Sensor

The Harley-Davidson twist grip sensor is a device that measures the amount of torque applied to the motorcycle’s throttle. This information is then used by the engine control unit (ECU) to adjust the fuel delivery and ignition timing. Testing the twist grip sensor is a relatively simple process that can be done with a multimeter.

  • Check for power at the sensor
  • If there is no power, check the fuse and wiring
  • With the power on, check for continuity between the two wires at the sensor
  • There should be continuity when the throttle is in the closed position and no continuity when the throttle is open
  • If there is still no power or continuity, replace the sensor
Harley Twist Grip Sensor
Harley Twist Grip Sensor

What is a Twist Grip Sensor?

A twist grip sensor is a type of rotary encoder that is used to measure the angular position of a shaft or axle. The sensor consists of a housing with two channels that are each filled with an electrically conductive liquid.

A rotating metal plate in the housing completes the circuit between the two liquids as it turns, and this change in electrical resistance is used to determine the angle of rotation.

How Do You Test a Motorcycle Tps?

If you’re having trouble with your motorcycle’s throttle position sensor (TPS), there are a few tests you can do to see if it’s the culprit. First, check for any loose or corroded wires. Next, test the TPS with a multimeter to see if the resistance is within the specified range.

Finally, use a scan tool to check for proper TPS operation.

How Do You Reset the Throttle Position Sensor on a Harley Davidson?

If your Harley Davidson is starting to have issues with idling, stalling, or hesitations, it might be time to reset the throttle position sensor. This sensor is responsible for sending information about the position of the throttle butterfly valve to the electronic control module. When this sensor gets out of alignment, it can cause all sorts of problems with your bike’s performance.

Fortunately, resetting the throttle position sensor is a relatively easy process that you can do at home with just a few tools. To start, you’ll need to locate the TPS on your Harley Davidson. On most models, it’s located on the right side of the carburetor body near the throttle cable bracket.

Once you’ve found it, use a flathead screwdriver to loosen the retaining screws and pull off the electrical connector. Next, use a small adjustable wrench to turn the TPS counterclockwise until it stops. This will ensure that the throttle plate is in its fully closed position when you go to reinstall it.

Once you’ve done that, reinstall the TPS making sure that the electrical connector is properly seated and tightened down before moving on. Now it’s time to adjust the TPS so that it’s sending accurate information to your ECM. To do this, you’ll need a code reader or scan tool that can access your bike’s computer system.

With the code reader connected, turn the ignition switch to “On” but don’t start the engine. You should see a reading on the code reader display that says something like “TPS Closed Position Learning.” If not, consult your bike’s service manual for specific instructions on how to enter diagnostic testing mode.

With the correct display showing, hold down the accelerator pedal all the way to the floor and count to five out loud slowly. Then release the pedal and count to five again out loud Slowly before repeating the entire process two more times for a total of three cycles or 15 seconds total time holding The pedal down.

What is a Tgs on a Harley?

A TGS, or Touring Gear Shift, is a type of shifter found on some Harley-Davidson motorcycles. It is similar to a manual transmission but uses an electronic shift actuator instead of a mechanical linkage. The TGS was introduced in 2007 on the Harley-Davidson Road King and Ultra Classic models.

It became standard equipment on all touring models in 2008. The main advantage of the TGS is that it allows the rider to keep both hands on the handlebars while shifting gears. This can make for a more comfortable ride, especially when riding for long periods of time.

The TGS also eliminates the need for a clutch lever, which can be convenient for riders with limited hand strength or dexterity. To shift gears with a TGS, the rider simply presses a button on the left handlebar to upshift, or a button on the right handlebar to downshift. The motorcycle’s computer automatically adjusts engine speed and throttle position to ensure smooth gear changes.

Harley Twist Grip Sensor Reset

If your Harley’s twist grip sensor has stopped working, you may be able to reset it yourself. The twist grip sensor is located on the right handlebar and is used to control the throttle. If the sensor isn’t working, it can cause problems with the engine and make riding difficult.

To reset the twist grip sensor, first, make sure that the bike is in neutral and the engine is off. Then, disconnect the battery and wait for a few minutes. Once the battery is disconnected, press and hold the start button for five seconds.

After you’ve held the start button for five seconds, reconnect the battery and turn on the ignition. If your Harley’s twist grip sensor still isn’t working after you’ve tried resetting it, you may need to take it to a dealer or mechanic for further diagnosis.

How to Replace Harley Twist Grip Sensor

If your Harley is equipped with a twist grip sensor, you may need to replace it at some point. Here’s how to do it:

1. Remove the old sensor. This will be located on the handlebar, near the grips. Use a wrench or socket to remove the sensor’s mounting bolts.

2. Clean the area where the new sensor will be mounted. This will ensure good contact between the sensor and the handlebar.

3. Install the new sensor in the reverse order of removal. Be sure to use thread lock compound on the mounting bolts, and tighten them to spec.

4. Reconnect any wiring that was disconnected during removal, and test the new sensor by starting up your Harley and twisting the throttle grip.

Harley Twist Grip Sensor Problems

Harley-Davidson motorcycles are known for their quality and durability. However, even the best machines can have problems from time to time. One common issue that riders may experience is with the twist grip sensor.

The twist grip sensor is responsible for sending a signal to the motorcycle’s computer when the throttle is turned. This information is then used to adjust the engine speed accordingly. If the twist grip sensor isn’t working properly, it can cause all sorts of problems for the rider.

One symptom of a faulty twist grip sensor is an engine that revs erratically or doesn’t respond correctly to throttle input. This can make it very difficult to ride smoothly, and can even be dangerous in some situations. Another common problem is false engine codes being thrown by the computer, which can lead to unnecessary repairs being carried out.

If you’re experiencing any issues with your Harley’s twist grip sensor, it’s important to get it checked out as soon as possible by a qualified mechanic. In most cases, replacing the sensor will fix the problem and have you back on the road in no time!


The Harley-Davidson electronic throttle is operated by a twist grip sensor. This sensor tells the motorcycle’s computer how much throttle to apply based on the amount of twist applied to the grip. If the sensor isn’t working properly, it can cause problems with acceleration and engine speed.

Testing the sensor is a relatively simple process that can be done with a multimeter.


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