A bike has a throttle position sensor if it is fuel injected. The throttle position sensor (TPS) is a major electrical sensor of modern motorcycles controlling or regulating the supply and flow of fuel to the engine. It provides direct signals to the fuel injection system. This article will show you how to identify and fix a Harley Davidson's throttle position sensor problem.
The Performance of The TPS
As part of the motorcycle's fuel system, the Throttle Position Sensor performs the following functions:
- Determines the position of the throttle and communicates it to the engine control module (ECM).
- Determines the correct air-fuel mixture in the engine
Identifying The Harley Davidson's Throttle Position Sensor Problem
Many things could cause damage to a TPS: It could be mechanical problems, electrical (wiring/ connections), or physical damage. Here is how to know if a TPS is bad.
- Unsteady When Idling
You can easily detect a bad TPS if your Harley Davidson doesn't remain steady while idling. Likely, your engine isn't getting enough fuel, and your TPS is not reporting it. That will result in an unsteady bike while idling. Perhaps your TPS is worn by repeated movement and twisting of the throttle. Lack of fuel will cause the motorcycle to turn off while idling or experience rough or slow idling, making it unsafe for the rider and other road users.
- Power And Acceleration Issues
The throttle sensor is bad if it's not providing correct fuel readings to the engine ECU. The bike may refuse to exceed a certain speed limit even if you are throttling hard. It can even turn off the rider because of the failure to provide the right input to the fuel injection system.
Causes Of The Problem
- Vibration and Environmental Conditions
- High operating temperature
- Repeated movement and twist of the throttle
Effects Of The Problem
- Results of poor fuel economy
- Limited Performance
Any problem with the throttle position sensor can result in low speed, stiff throttle, hesitation, surging at certain throttle points, stalling, and in most cases, a drop in gas mileage.
Primarily, a failed throttle position sensor (TPS) affects the functionality of a bike, especially how it runs and accelerates. The effect is usually minimal if it is quickly detected and well managed.
What To Do? Proposed Solution
You should follow these solutions to enjoy the fun in Harley Davidson bikes and drive safely:
- Regular Fuel System Inspection And Maintenance
It would be best to regularly clean the throttle body connection, idle air control, and apply dielectric grease. The plugs should also be cleaned and recapped. You can get a NOX sensor-safe cleaner to spray and let the body of the throttle dry. That can be helpful. Do all basic checks for any leakage, loose wire, all mounting screw, and tighten the loose screws.
- Call A Professional Mechanic For Proper Diagnosis
If you don't have the necessary kits to care for your TPS, your best bet would be to hire a professional. A digital storage oscilloscope is the most effective way to test a TPS. To service it correctly, ensure you have the service manual for your model, a good multimeter, and a micro lead test kit. Before working on it, explore several kinds of tests to confirm the exact problem with your Harley Davidson's model.
- Replacing Parts
It could be spark plugs, plug wires, or coils. However, replacing a bad TPS is highly recommended (not cleaning it) because it takes a lot of time to dismantle the parts and assemble them back. Also, replacing the worn contact surface may fix the failed throttle position sensor problem faster than cleaning it. That is purely electrical, and you must ensure that you have disconnected the battery before starting work.
To carefully unplug the old sensor, remove mounting screws, unplug, and dispose of it according to local regulations. Then, mount and screw the new sensor. Ensure to wear work gloves to care for your hands. Find a good workspace to park your Haley Davidson motorcycle and work on it.
About the authors
The CarAraC research team is composed of seasoned auto mechanics and automotive industry professionals, including individuals with advanced degrees and certifications in their field. Our team members boast prestigious credentials, reflecting their extensive knowledge and skills. These qualifications include: IMI: Institute of the Motor Industry, ASE-Certified Master Automobile Technicians; Coventry University, Graduate of MA in Automotive Journalism; Politecnico di Torino, Italy, MS Automotive Engineering; Ss. Cyril and Methodius University in Skopje, Mechanical University in Skopje; TOC Automotive College; DHA Suffa University, Department of Mechanical Engineering
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