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HomeHow to Bypass Crank Position Sensor: A DIY Guide.

How to Bypass Crank Position Sensor: A DIY Guide.

To bypass the crank position sensor, you need to disconnect it from the vehicle’s wiring harness. One of the most crucial sensors in a vehicle is the crank position sensor.

It detects the position and speed of the crankshaft, which helps the engine management system to determine the fuel injection and ignition timing. However, if the crank position sensor fails or provides inaccurate readings, it can lead to starting problems and engine misfires.

Bypassing the crank position sensor can be a temporary solution, but it should only be done when necessary. This article will guide you on how to disconnect the crank position sensor from the vehicle’s wiring harness.

How to Bypass Crank Position Sensor: A DIY Guide.


What Is A Crank Position Sensor (Cps)?

Definition Of Cps

A crank position sensor (cps) is an essential component of a car’s engine management system. It is responsible for monitoring the position and speed of the engine’s crankshaft and sending this data to the car’s main computer. The cps works in conjunction with other engine sensors to help the engine control unit (ecu) determine the right amount of fuel to be used during combustion.

  • Cps monitors position and speed of engine’s crankshaft
  • Sends data to car’s main computer
  • Helps ecu determine the right amount of fuel to use

Importance Of Cps In Car Engines

Since the cps is responsible for maintaining accurate timing of the engine, it plays an integral role in a car’s performance. Without a functioning cps, the engine may not start, cause the car to stall, or suffer from poor acceleration, which could lead to increased fuel consumption and damage to the engine.

  • Maintains accurate timing of the engine
  • Plays an integral role in a car’s performance
  • Engine may not start or cause the car to stall without a functioning cps

By understanding the definition and importance of a cps in a car’s engine management system, you can identify the critical role it plays in the overall performance of the vehicle. Regular maintenance of the sensor is necessary to ensure it continues to function correctly.

If you experience any issues with your engine’s performance, consulting a mechanic and getting your cps tested should be one of the first steps you take.

Symptoms Of A Bad Crank Position Sensor

Common Symptoms Of A Bad Cps

Your car’s crank position sensor (cps) is a critical component of your vehicle’s ignition system. A malfunctioning cps might produce a range of symptoms such as:

  • Your car not starting at all, or it might go off unexpectedly while driving
  • Engine misfire or fluctuation in rpms while driving
  • Check engine light turning on, indicating a fault in the car’s system
  • Vibrations or knocking sounds emanating from the engine

How A Bad Cps Can Affect Car Performance

A bad cps can contribute to extensive mechanical issues within your car’s engine. It could cause severe damage to the car’s timing belt or even harm the engine’s valves, leading to expensive repairs. Below are some ways a malfunctioning cps can affect the car’s general performance:

  • Reduced fuel efficiency – the car will consume more fuel than usual
  • A decrease in power – the engine may feel less potent while driving
  • Difficulty starting – the engine may take longer to start or won’t start at all
  • Stalling during operation – the engine may stop running abruptly while driving

Importance Of Identifying A Bad Cps

It is essential to identify the symptoms of a bad cps and repair or replace it as soon as possible. Understanding how the cps functions and spotting problems early on may help prevent severe engine issues. Below are the reasons why identifying and fixing a bad cps is crucial:

  • Improved performance – repairing the cps can also resolve other performance issues in the car
  • Cost-effective – replacing a faulty cps early may save you from severe engine damage, saving you money on costly repairs
  • Prevent accidents – unexpected engine shut-down could cause accidents when driving in traffic.

By understanding the signs of a bad cps, keeping your car in excellent condition, and regularly replacing parts, you can help ensure your vehicle’s reliable performance.

Tools And Materials Needed For Bypassing Crank Position Sensor

If you are having trouble with your crank position sensor, you may consider bypassing it. This process requires some tools and materials that you may not have lying around in your garage. In this section, we will discuss the tools and materials you will need, where to purchase them, and the estimated cost of the materials.

List Of Required Tools And Materials

To bypass a crank position sensor, you will need a few things to get started. These include:

  • Screwdrivers: You may need both a phillips-head and slotted screwdriver for this process.
  • Wire cutters/stripper: If you need to cut or strip any wires, you must have a wire cutter/stripper on hand.
  • Electrical tape: This will be needed to hold the wires in place.
  • Soldering iron: In case of any broken wires or connections, a soldering iron is a must-have tool.
  • Butane torch/cigarette lighter: You’ll need this to heat up the soldering iron.
  • Multimeter: You’ll need this to test and verify the electrical connections.

Where To Purchase These Materials

You may find these tools and materials at your local hardware store or online retailers such as amazon, home depot, or lowe’s. These retailers offer great deals and are known for their wide selection of tools and materials for anyone who needs them.

Estimated Cost Of Materials

The cost of tools and materials needed for bypassing a crank position sensor may vary depending on the brands and your location. A basic kit of the above-listed materials can cost anywhere from $50 to $100, but you can find some good deals online with a little research.

Keep in mind that although the materials may seem costly, it may still be cheaper than taking your car to a mechanic to replace the sensor.

Having the right tools and materials is essential when it comes to bypassing the crank position sensor. By following our guide, you will have a clear understanding of what you need to purchase and where to find them. Remember, if you are not confident in your ability to perform this task, it might be best to consult a professional mechanic to avoid any mishaps.

Step-By-Step Guide To Bypassing Crank Position Sensor

Are you experiencing issues with your car’s engine that the diagnostic test reveals as a problematic crank position sensor (cps)? It can be an expensive repair job, but there is a bypass solution. Bypassing the cps can save you money and time, provided that you do it correctly.

Here’s a step-by-step guide on how to bypass the cps correctly using a simple jumper wire method.

Steps To Bypass Cps

Before you begin, ensure that you have the necessary tools:

  • A jumper wire
  • Electrical tape

Once you have these tools, you can begin the process:

  • Access the cps connector: Locate the cps connector, which is usually near the engine block. Consult your car’s owner manual if you’re unsure.
  • Clip the wire: Cut the wire that runs from the sensor to the computer using a wire cutter.
  • Strip the wires: Use wire strippers to strip the ends of the wire that runs from the computer, and the wire that runs from the sensor.
  • Connect the jumper wire: Wrap the stripped wire ends around the jumper wire and secure them in place with electrical tape.
  • Insulate the wires: Use electrical tape to insulate the bare wires and cover the jumper wire.
  • Test the engine: Start the engine to check if it works properly. If it does, then you have successfully bypassed the cps.

Precautions And Safety Measures To Take During The Process

Before and during the cps bypass process, it’s essential to take precautions to ensure your safety and avoid any damage to your car.

  • Disconnect the battery: Before you begin, disconnect the battery to prevent electrical shock.
  • Use insulated tools: Ensure that the tools you use are insulated to avoid electrical shocks.
  • Wear gloves: Wear gloves to protect your hands and reduce the risk of injury.
  • Clean the area: Ensure that the area around the cps connector is clean and dry.
  • Consult an expert: If you’re not confident in completing this process, consult an expert for help.

Common Mistakes To Avoid

Here are some common mistakes to avoid when bypassing the cps:

  • Cutting the wrong wire: Ensure that you cut the right wire to prevent any irreversible damage to your car
  • Using the wrong tools: Use the right tools for this process, as using the wrong ones can cause damages to the wires
  • Forgetting to insulate the wires: Failing to insulate the wires properly can lead to electrical shorts and even fires.
  • Reversing the polarity: Make sure you connect the wires correctly, or you risk reversing the polarity.

By following the steps mentioned above and taking the necessary precautions, you can safely bypass the cps and get your car on the road again without breaking the bank.

Testing The Bypassed Crank Position Sensor

How To Test The Cps After Bypassing

Now that you have bypassed the crank position sensor (cps), it’s important to test it to make sure everything is working correctly. Here are the key points to keep in mind:

  • First, turn the key in the ignition to the “on” position, but do not start the engine. You should see the check engine light and the battery light come on. If they don’t, there may be an electrical problem.
  • Next, use a multimeter (set to dc volts) to test the voltage of the cps signal wire. This wire should have a voltage reading between 0.3 and 1.8 volts when the engine is idling.
  • If you don’t see any voltage, or the voltage is outside of the acceptable range, then there may be a problem with the cps wiring or the car’s computer.
  • Finally, use a scan tool to read any error codes that may be present. If there are no error codes, and the voltage on the cps signal wire is within the correct range, then your bypassed cps is working properly.

Common Problems To Look Out For After Bypassing

Bypassing the crank position sensor can solve some problems, but it can also create others. Here are some common issues to be aware of:

  • The check engine light may remain on, even if everything is working correctly. This is because the car’s computer is programmed to expect a signal from the cps, and when it doesn’t receive one, it assumes there is a problem.
  • The car may run rough or hesitate during acceleration. This is because the cps provides crucial information about the position of the crankshaft, which the car’s computer uses to determine when to fire the spark plugs. Without this information, the spark timing may be off.
  • The car may not start at all. If the cps bypass is not done correctly, or if there is an electrical problem elsewhere in the car’s system, the engine may not start.

Keep these common problems in mind when testing your bypassed cps, and be prepared to troubleshoot further if necessary.

Final Testing Before Starting The Car Engine

Before starting the car engine, there are a few final tests to perform to ensure everything is working correctly:

  • Turn the key in the ignition to the “on” position, but do not start the engine. Make sure the check engine light and the battery light come on, and then turn off after a few seconds.
  • Use a scan tool to read any error codes that may be present. If there are any codes, address them before attempting to start the engine.
  • Finally, try starting the engine. If it starts and runs smoothly, then your bypassed cps is working correctly. If there are still problems, you may need to troubleshoot further or seek professional help.

By following these testing procedures, you can be confident that your bypassed cps is working correctly and your car is ready to hit the road.

Frequently Asked Questions On How To Bypass Crank Position Sensor

How Do I Know If My Crank Position Sensor Is Bad?

You may experience problems like engine misfiring, stalling, or no-start. Also, check engine light codes like p0335 and p0336 may come up on the scanner.

What Happens If I Bypass The Crank Position Sensor?

Bypassing the position sensor can cause problems like erratic ignition timing, reduced fuel efficiency, increased emissions, and possibly engine damage.

How Can I Bypass The Crank Position Sensor?

You’ll need to consult a professional mechanic to bypass the crank position sensor because it requires a lot of technical expertise and specific tools.

Can I Still Drive My Car With A Faulty Crank Position Sensor?

You can start your car with a faulty crank position sensor, but the vehicle may stall or not run at all while driving. It’s best to get it fixed immediately.

How Much Does It Cost To Replace A Crank Position Sensor?

The cost of replacing a crank position sensor depends upon the type of car you have and the location of the sensor. However, the cost can range from usd 150 to usd 250.


After going through the above steps, it is quite clear that bypassing the crank position sensor is not a difficult task. But, it is important to understand the risks and how it can impact the performance of your engine. If you do decide to bypass the sensor, make sure to follow the steps carefully and ensure that you’ve done it in the right way.

However, if possible, it’s better to replace the sensor or fix the underlying issue instead of bypassing it. At the end of the day, prioritizing the safety and longevity of your vehicle is essential. Moreover, it’s always recommended to consult a mechanic or a professional before attempting any diy fixes to avoid further complications.

With that being said, we hope this guide was helpful, informative, and made the process of bypassing the crank position sensor a lot easier for you.



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