How to Bypass Crank Position Sensor : Ultimate Guide.

To bypass crank position sensor, cut the wires that run from the sensor to the ecu and connect them with a jumper wire. The sensor is responsible for providing the ecu with information about the rpm and position of the crankshaft.

If the sensor is faulty, the engine may not start. The crank position sensor is a vital component in any vehicle’s ignition system. Without it, the engine cannot start or even run properly. However, there are times when the sensor fails and causes issues like stalling, misfire, and no start.

In such cases, the only option is to replace the sensor. But what if you need to get the car running immediately and cannot replace the sensor right away? That’s where bypassing the crank position sensor comes into play. In this article, we will discuss how to bypass the crank position sensor and get your vehicle back on the road quickly.

How to Bypass Crank Position Sensor  : Ultimate Guide.


Understanding The Cps And Its Malfunctions

The crank position sensor (cps) is a significant component in your vehicle that helps to regulate its ignition and fuel injection system. However, just like other electrical parts of your car, a malfunction can occur. In this section, we’ll discuss the different types of cps, the symptoms of a cps problem, and the most common reasons for cps malfunctions.

Types Of Cps And Their Differences

Depending on the engine type, there are two types of cps; magnetic and hall effect sensors. Here are some key points to consider with each type:

– Magnetic Cps:

  • Uses a magnet to register the position of the crankshaft.
  • Generates an electric signal that is sent to the ecu (electronic control unit).
  • It’s known for its durability, reliability and has a longer lifespan compared to the hall effect sensor.

– Hall Effect Cps:

  • Uses a semiconductor to register the crankshaft position.
  • Creates a voltage signal that the ecu sends to the engine control module.
  • Provides a more accurate reading compared to the magnetic cps.

Diagnosis Of Crank Position Sensor Failure Symptoms

Detecting cps issues can be tricky, and it’s crucial to diagnose the problem accurately. Here are some typical cps malfunctions symptoms to check:

  • Intermittent starting problems where the engine randomly won’t start.
  • The check engine light is triggered.
  • Reduced engine performance or stopping completely while driving.
  • Rough idling and stalling, especially when stopping or accelerating.
  • Sudden drops in rpm while driving.

Common Causes Of Cps Malfunctions

Apart from the sensor itself, cps issues are caused by several reasons. Here are the most common ones:

  • Damaged wiring or connections leading to the cps can disrupt the electrical signal.
  • Exposure to high temperatures, leading to sensor damage or continuous operation.
  • Dirty or contaminated cps components can prevent accurate readings and result in malfunction.
  • Over-cranking the engine leading to faulty readings by the sensor.

Knowing the different types of cps, their differences, the symptoms of a failing sensor, and common causes of cps malfunctions is vital for maintaining vehicle performance. Regular vehicle maintenance, inspection, and replacement of the cps when necessary will go a long way in preventing engine failure.

Ways To Bypass Cps

The crank position sensor (cps) is one of the essential parts of a vehicle’s engine management system that plays a crucial role in providing feedback to the electronic control module (ecm). This feedback is instrumental in ensuring that the ignition and fuel injection timing are accurate, and the engine runs smoothly.

However, when a cps goes bad, your vehicle’s engine will not start, or it may run erratically. Replacing a faulty cps can be expensive, so some mechanics recommend bypassing the cps altogether. There are three ways to bypass a faulty cps.

Mechanical Bypass Of Crank Position Sensor

Mechanical bypassing of cps is a do-it-yourself method for an emergency solution. The cps generates electrical signals when the engine rotates, and you can bypass it mechanically by using any of the following methods:

  • Using a screwdriver or other metallic object by inserting it into the bolt hole on the cps and rotating the engine manually.
  • Shimming the cps by adding a piece of metal or other objects to the cps shaft to adjust the gap.

Electrical Bypass Of Crank Position Sensor

An electrical bypass is another alternative to mechanical bypass of cps. The best way to achieve this is by purchasing an ignition lead wire, attaching it to the cps connector, and connecting the other end to an ignition coil.

  • Purchase an ignition lead wire.
  • Cut off the connector ends of the cps and attach the ignition lead.
  • Connect the other end of the ignition lead to the ignition coil.

Programming Bypass Of Crank Position Sensor

The third way to bypass a cps is by programming your vehicle’s ecm to ignore the cps signal. This is a more advanced approach, and it requires specialized equipment such as a tuning software or programmer with the necessary features.

  • Program or tune the ecm to ignore cps signal.
  • Ensure that your ecm has those features required to bypass cps.
  • Set your vehicle to zero crankshaft position.

Bypassing a faulty cps is not advisable as it can lead to potential engine damage. However, in cases of emergencies, the methods described above can be helpful. Remember to consult an expert mechanic before attempting to bypass your vehicle’s cps.


Pros And Cons Of Bypassing Cps

Bypassing the crank position sensor (cps) may solve some car troubles. Cps is responsible for determining the position of the crankshaft, which is crucial for fuel injection, spark sequence, and other critical processes that support engine efficiency. However, bypassing cps also has its fair share of drawbacks.

This article will discuss the advantages and disadvantages of bypassing cps, as well as safety concerns to ensure that you make an informed decision.

Advantages Of Bypassing Cps

  • Eliminates mechanical problems: The cps can be damaged by wear and tear, causing malfunctions that affect the engine’s performance. Bypassing the cps means that the faulty sensor will no longer be inhibiting the engine’s operation.
  • Saves on repairs: Replacing a damaged cps can be costly. Bypassing it can be an inexpensive solution to temporarily keep your car running.
  • A temporary solution: If a new cps is not readily available, bypassing can be a temporary fix until the new part arrives, which can be convenient for drivers in a hurry.

Disadvantages Of Bypassing Cps

  • An increase in fuel consumption: The cps’s primary function is to optimize fuel injection. Bypassing it can lead to a more intense fuel consumption, which can cost higher fuel costs.
  • Damage to other components: The cps is not a standalone component. Its failure can cause other parts of the engine to fail. Bypassing cps can lead to severe damage to these other systems.
  • Difficult to spot other issues: Bypassing cps can lead to difficulty identifying other engine issues. The vehicle’s computer is unable to recognize cps. Thus, it may not identify other potential problems with the engine that could arise.

Addressing Safety Concerns While Bypassing Cps

  • Expert mechanic required: Bypassing cps is recommended only for expert mechanics. Diy attempts can lead to severe engine damage.
  • Poor engine performance: Bypassing cps can impact engine performance, causing it to stall, misfire, and creating an unsafe driving environment.
  • Hidden engine issues: Bypassing cps can mask other hidden engine issues like failing exhaust gas recirculation or a catalytic converter. These issues could cause the driver and passengers to smell exhaust fumes that lead to fatigue or in extreme cases, carbon monoxide poisoning.

While bypassing cps can be a quick fix, it is crucial to consider the advantages and disadvantages of this option. Working with an expert mechanic is essential, and maintaining regular engine checkups can avoid any significant issues with your vehicle engine.

Step By Step Guide To Bypass Cps

Crank position sensors (cps) are important for ensuring your vehicle’s engine runs smoothly and efficiently. However, if you encounter issues with your cps, you may need to bypass it to keep your vehicle running. In this blog post, we’ll provide a step-by-step guide on how to bypass cps.

Tools And Equipment Required For Cps Bypass

Before we dive into each method of bypassing cps, here are the tools and equipment you’ll need:

  • Gloves
  • Flat-head screwdriver
  • Wrench
  • Multimeter
  • Wire cutters
  • Splice connectors
  • Electrical tape

Mechanical Method

The mechanical method of bypassing cps involves physically removing the cps and tricking the vehicle’s system into thinking it’s still in place. Here’s how:

  • Locate the cps on your vehicle’s engine
  • Use a flat-head screwdriver to remove the sensor’s screws and unplug it from the wiring harness.
  • Use a wrench to remove the cps ring from the timing gear.
  • Replace the cps ring with a spacer of the same thickness to keep the timing gear in place.
  • Replug the wiring harness and turn on the vehicle to confirm that it’s running smoothly.

Electrical Method

The electrical method involves bypassing the cps’s signal to the vehicle’s computer by splicing wires. Here’s how:

  • Locate the cps and unplug it from the wiring harness.
  • Use a multimeter to identify the wires that carry the cps signal.
  • Cut those wires and strip a small amount of insulation from each end.
  • Use splice connectors to connect the ends of the cut wires.
  • Wrap electrical tape around the splice connectors to secure them and prevent any short circuits.
  • Replug the wiring harness and turn on the vehicle to confirm that it’s running smoothly.

Programming Method

The programming method involves using software to change the vehicle’s computer settings to bypass the cps. However, this method is more complex and requires advanced knowledge of vehicle programming. We recommend consulting with a professional if you’re interested in this approach.

Bypassing cps involves either a mechanical, electrical, or programming method. With the right tools and equipment, it’s possible to bypass cps and keep your vehicle running smoothly without replacing the sensor. Remember to consult with a professional if you’re unsure about which method to use or encounter any issues during the process.

Frequently Asked Questions Of How To Bypass Crank Position Sensor

What Is A Crank Position Sensor?

A crank position sensor is a device in your car that monitors the position of the engine’s crankshaft. It allows the engine control unit to determine where each piston is in its stroke and adjust fuel and ignition timing accordingly.

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

If your vehicle is having trouble starting, is stalling out, or is misfiring, it could be a sign that your crankposition sensor is bad. You can also check the sensor for wear or damage, or use a diagnostic tool to check for error codes related to the sensor.

Can I Bypass My Crank Position Sensor?

Yes, you can bypass your crank position sensor in some circumstances, but it is not recommended. Doing so can cause damage to your engine or other parts of your vehicle, and will likely cause the engine to perform poorly.

How Do I Bypass My Crank Position Sensor?

The process for bypassing your crank position sensor may vary depending on your vehicle make and model. However, in most cases it involves manually setting the timing and fuel injection settings, which can be difficult to get right and may cause engine damage.

Should I Attempt To Bypass My Crank Position Sensor?

No, bypassing your crank position sensor is not recommended. It is much safer and easier to replace the sensor if it is malfunctioning or causing problems with your engine. Always consult with a qualified mechanic or technician before attempting any major repairs or modifications to your vehicle.


It is evident that the crank position sensor plays an essential role in the overall functionality of a vehicle. However, if a faulty sensor is preventing the engine from starting and running correctly, knowing how to bypass it can be crucial.

With the steps outlined in this post, you can bypass the crank position sensor and get your vehicle back on the road. Remember to take all necessary precautions and follow the instructions carefully to avoid damaging your vehicle or causing harm to yourself.

With a little bit of patience and the right tools, you can successfully bypass the crank position sensor and keep your car running smoothly. So, the next time you face this situation, don’t panic. Just refer back to this guide and save yourself time, money, and a trip to the mechanic!


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