HARLEY CODE P1510: MEANINGS, FACTS, SOLUTIONS

Harley Davidson motorcycles, just like any other bike, can experience issues that are diagnosed through error codes. The P1510 code is one such code that can be a frustrating problem for riders as it affects performance.

So, what is the Harley Code P1510 in your Harley? The code indicates a problem with the throttle actuator control (TAC) system. Specifically, it indicates that the signal voltage to the TAC system is out of range. This malfunction affects the operation of the fuel injection system, leading to EFI Limited Performance Mode.

In this guide, we will dive into the potential reasons behind the P1510 code and the various symptoms that it may cause. We will also explore possible solutions to the problem, including simple DIY fixes.

Understanding the Harley Code P1510

The Harley P1510 code indicates a fault with the Throttle Actuator Control (TAC) system. It is responsible for controlling the opening and closing of the throttle body in response to input from the rider’s throttle control.

The TAC system is closly linked to the EFI (Electronic Fuel Injection) system. And that is why it will result to EFI Limited Power (LIMP) mode – the mode associated with this error by many Harley enthusiasts.

How is the TAC Related to EFI?

They work together to ensure proper engine performance. TAC controls the throttle body butterfly valve, which regulates engine airflow.

The EFI system is responsible for regulating the amount of fuel that is injected into the engine. The amount is based on the amount of air that enters. This ensures that the air/fuel ratio is optimized for efficient combustion.

How is the Error Code and the LIMP Mode Triggered?

The TAC system and EFI system communicate with each other through the Engine Control Module (ECM). It receives data from various sensors in the motorcycle and uses this data to control the TAC and EFI systems.

For example, the ECM may receive data from the throttle position sensor to determine the position of the throttle body butterfly valve. It will then adjust the fuel injection to maintain the correct air/fuel ratio.

When the TAC gives wrong data, the EFI will be adjusted wrongly. This causes the ECM to trigger the P1510 error code and force the bike to enter “EFL Limited Performance Mode.” The mode reduces the engine’s power output to protect the engine from damage.

Here’s a visual explanation of Harley LIMP mode.

Symptoms of Harley P1510 Code

Here are the things that will tell you that you have this error:

1.     Check Engine Light

This light is usually located near the speedometer and will alert the rider to a potential problem in the motorcycle’s TAC system. The light will stay on until the issue is resolved. It may flash or remain steady depending on the severity of the problem. If it’s flashing, it is a minor issue with the TAC. When you have a steady lights, it is a serious TAC issue that must be fixed immediately.

2.     Rough Idling and Engine Misfires

Rough idling refers to the engine’s vibration and instability at idle. Normally, a Harley Davidson engine should idle smoothly. But when the engine is experiencing rough idling, it will produce uneven and shaky vibrations. This can be felt through the handlebars or footrests.

On the other hand, engine misfires refer to the incomplete combustion of fuel in one or more cylinders. The result is an irregular firing sequence. This will cause the engine to vibrate and produce a distinct popping or crackling sound.

3.     Reduced Acceleration Power and Top Speed

The motorcycle will enter EFI Limited Performance Mode when the Harley code P1510 is present.

The motorcycle’s performance is severely restricted when the safe mode is active. Your acceleration will be slow, and you will never hit high speeds. It will take longer to hit 60 miles per hour, and you might not go past that.

4.     Stalling and Failure to Start

Stalling occurs when the engine suddenly shuts off while the motorcycle is in motion. The motorcycle will feel like losing power, and the engine will begin to sputter or cut out entirely. In most cases, the motorcycle will stall and then fail to restart.

5.     Other Error Codes Present

This error might be present with others, such as the Harley code p1511.  They will provide additional information about the issue that is causing the P1510.

Note any additional error codes that appear, as they can help diagnose the problem and find a solution.

Causes of Harley P1510 Error Code

Here is what causes this error code in your motorcycle:

1.     Faulty Throttle Position Sensor

The TAC system consists of a throttle position sensor (TPS), which does as its name suggests.

If the sensor sends the wrong information, the EFI system will make wrong adjustments. This will lead to poor engine performance and P1510 code.

2. Faulty Throttle Body

If the throttle body is faulty, it may not operate properly, causing issues with the TAC system. For example, the butterfly valve may become stuck or may not open fully, causing a reduction in airflow into the engine.

The ECM detects the issue and triggers the P1510 code to indicate a problem with the TAC system.

3. Faulty Wiring or Connections

If there is a short or open circuit in the wiring, it may correlation errors. This will cause intermittent faults that affect the operation of the TAC system.

It will lead to reduced engine performance or limited performance mode activation, triggering the error.

4. Failed Engine Control Module

This is essentially the brain of the engine. It receives signals from various sensors to control the engine’s systems, including the TAC and EFI systems.

Without the ECM, the TAC system would not function properly, triggering the error code. You will also have a problem with other systems, triggering error codes like Harley code p0132 for oxygen sensor.

Step by Step Guide on How to Fix Harley P1510 Error Code

Here is a guide for troubleshooting this code:

1. Check the Connections to Sensors

The sensors to check include TPS and those that control EFI system.

Here are the steps to check the sensors:

• Locate the sensors: The TPS is located on the throttle body, EFI sensors are located in various locations. They include the Manifold Absolute Pressure (MAP) sensor, Engine Coolant Temperature (ECT) sensor, and Intake Air Temperature (IAT) sensor.
• Check the wiring and connections: Check for frayed wires or corroded connections. Repair or replace any damaged wiring or connections.
• Check the sensor readings: Use a multimeter or diagnostic tool for this. Consult the service manual to determine the correct sensor readings for your Harley model.
• Test the sensors: Perform sensor tests as outlined in the service manual. For example, you may need to perform a resistance, voltage, or continuity test.
• Replace faulty sensors: If any sensors fail the tests or have readings outside the specified range, replace them with new ones.

2. Replace the TAC module

Here are the steps involved in replacing the TAC module:

• Locate the TAC module: It is typically near the throttle body or intake manifold.
• Disconnect the electrical connections: The TAC module has connections for power, ground, and signals from the ECM and throttle position sensor. These connectors must be disconnected before the TAC module can be removed.
• Remove the mounting bolts: These bolts must be removed to free the TAC module from its mounting location.
• Install the new TAC module: Once the old one has been removed, the new one can be installed. This will involve securing the new module with mounting bolts and reconnecting the electrical connectors.

3. Do a Throttle Relearn

Throttle body relearn is a procedure that may be required after replacing the TAC module or the throttle body.

The procedure may vary depending on the motorcycle’s make and model, but here is a general overview:

• Turn off the motorcycle’s ignition and remove the key.
• Disconnect the battery cables and wait at least 30 seconds to reset the ECM.
• Reconnect the battery cables and turn on the ignition.
• Turn on the motorcycle’s electrical system, but do not start the engine.
• Twist the throttle grip to its full open position and hold it for 5 seconds.
• Release the throttle grip and allow it to snap closed.
• Wait for 15 seconds and repeat steps 5 and 6 at least two more times.
• Turn off the ignition and remove the key.

4. Replace the ECM

After all other troubleshooting steps have been exhausted, replacing the ECM is the last step in fixing this TAC code. This is an expensive step and should only be considered after ruling out all other possible causes.

You must purchase a new one compatible with your Harley model to replace the ECM. The new ECM must be programmed to match your motorcycle’s specific parameters.

This requires specialized equipment and knowledge. Hence, we recommend that a trained technician or an experienced DIY mechanic perform this step.

FAQs

Here are answers to questions that will come up by the end of reading this article:

Conclusion

So, there you have them- this code’s causes, facts, symptoms and solutions. To prevent Harley Code P1510 from occurring in future, keep your motorcycle’s throttle system clean and well-maintained.

Don’t keep messing with throttle wiring and connections. Also. clean your throttle body and intake manifold periodically. Finally, keep your ECM and other sensors well-maintained. Replace them as needed to prevent malfunctions that can trigger P1510.