ECM is one of the most important parts of a diesel truck and it should be checked quite often to identify any fault or issues. Here in this article, you will come to know about the 4 steps on how to diagnose engine computer of trucks.

Visual inspection is essential to check engine control modules in your truck. It helps in identifying any physical defects related to an ECM. Often, a faulty ECM can be a result of a burnt circuit board or poor wirings. Hence, performing a visual checking is something that every car owner can do at home, and it is referred to as one of the first tests to identify a defective ECM.

Today, in this article, you will know about the four steps to diagnose the fault Engine Computer Module (PCM, ECU or ECM) and to identify whether there is a major problem. The steps are visual inspections, simple swapping, use of scanner and elimination.

1. Visual Inspection

When you are doing the visual inspection, you should first start checking the PINs. You must be sure that they are all upright and in intact condition. Once done, you should move to the smell test. You can whiff by the plug of the circuit unit; it will help you know whether the unit is okay or not. If you are getting any particular odour of burnt plastic, it indicates that there is an issue with the ECM. At this point, you should further inspect the board by opening the unit.

When you open the unit, you can inspect the burnt components or any corrosion inside. If a defect is found, the Engine truck Computer needs immediate replacement.

2. Simple Swapping

For this step, simple swapping can be done. This process is very effective when you are working with an old car model. In the case of OBD-1, the Engine Computer does not need reprogramming of ECM. If you find any replacement unit that matches exactly with OEM number while putting the replacement part in the vehicle, if this unit can communicate with the module, this is an indication that the unit needs replacement.

3. Use The Scanner To Check

For the third step, you can choose a tool like a scanner. Plugging the scanner with OBD-II port will help you to know whether codes are coming out from the Engine Computer or not. Once you have recognized the faulty codes, you can identify the cause of the engine computer's problem.

4. Process Of Elimination

Step 4 involves the process of elimination. When you diagnose the issue with Engine Computer by the elimination process, you can focus on two items- the Inputs and Outputs. The Inputs are the battery, ignition switch, fuses and sensors. The outputs are Fuel injectors, spark plugs, fuel pumps and starters.

With the use of inputs, you can trace whether the power is getting to Engine Computer or not. You then start off with the battery of the engine. Check whether there is enough voltage coming out or not. If the Engine Computer is getting enough voltage, then inspect the other parts. Make sure that injectors or the fuel pump are getting the required signals.

If these four steps do not help you diagnose the Engine Computer, make you consult any technician who will provide the best services.