The Basics of Testing an ECM to Find Out its Problems

An electronic control module is an electronic computer that controls some of the most important functions in your car through different components. It receives signals from different sensors installed on the car and then sends command signals to actuators to perform tasks such as injecting fuel into the engine’s combustion chambers. It also affects the air-to-fuel mixture in the combustion chamber, gear shifting, throttle position, ignition, and more.

When your ECM malfunctions, you may see a sudden drop in your car’s performance. Even though a drop in performance indicates an ECM problem, it doesn’t specify the type of problem. You’ll need to consult an ECM expert for that. Let’s take a look at how experts test ECM to find out the right ECM problem.

Signs that Indicate ECM Problems

Before we get to how experts test the ECM, let’s look at some common signs that indicate ECM failure or malfunction in vehicles:

• Low Mileage
• Draining Battery
• Engine Stalling or Misfiring
• Engine not Starting
• Low Acceleration
• Problems with gear shifting
• Excessive emissions
• Check the engine light on the dashboard

These problems can also occur due to other reasons, but they are common when the ECM malfunctions. Make sure to get your car checked by an ECM expert before getting anything done.

ECM Testing

The only way to determine the exact problem with your ECM is to inspect it using an OBD or an OBD II scanner. It scans the ECM and determines where the problem lies. Some of the common tests OBD scanners run include:

Diagnostic Test

Initially, ECM experts run diagnostic tests to detect the errors the scanner returns. This is done to make sure if the ECM is malfunctioning or not. For example, if your engine is misfiring, the scanner should display an error code that says the engine is misfiring due to a malfunctioning cylinder. If not, the ECM is not the problem and is working fine. Similarly, the test is done for all problems you face with your car.

Functionality Test

The functionality test is done to ensure every component in the engine is working fine and is working as expected.

Rationality Test

This test is done after the functionality test, and the sensors are checked to see if they are sending the right signals to the ECM. The signals should be accurate and not contradict for the car to perform well.

Circuit Test

If none of the problems show up, experts run a circuit test to check if the wiring is intact and if there’s no short circuit or any other wiring problems in the ECM.

If you’re looking for an ECM expert to get your ECM tested, repaired, or replaced, CATECM can help you.

We are a trusted ECM repair and reprogramming company. Our ECM experts can inspect your ECMs and perform the necessary ECM repairs or reprogramming. Furthermore, we also have remanufactured ECMs to replace your old ECM. All of our products and services come with a one-year warranty.

Get in touch with us now for more information.