Every Chevrolet truck has an engine control module that manages the electronic components of the engine and monitors sensors for errors.XPROG-M V5.60 Returning the ECM to its factory state may be necessary to troubleshoot or resolve a number of problems.

Remove the nut from the negative battery cable using a socket set or wrench. Slide the cable off of the battery and set it aside.

Turn the headlight switch to the "On" position to drain the ECM of any remaining power. Wait at least 10 minutes,MB SD compact 4 then turn it back to the "Off" position.

Replace the negative battery cable by reversing the previous steps. Tighten the nut until it feels secure, paying attention not to overtighten it. The ECM has now been reset.

Tips & Warnings

If you find it difficult to keep the battery cable from touching the negative terminal,Creader CRP229 use a non-conductive material such as rubber as a barrier.
The negative cable is the black one marked with a minus sign.
Do not allow the negative cable to touch the positive one, or allow your tool to bridge the two terminals.

How to Tell If a Ford ECM Is Good?

The electronic control module in a Ford cannot diagnose itself, so it gives you other signs to let you know that it is bad. The major sign is that it will give erroneous or non-existent codes when you scan the ECM with a code scanner. If the ECM malfunctions, the vehicle may or may not run,wiTech MicroPod 2 depending on which circuit or circuits are burned or defective.

Plug the code scanner into the data link port under the driver's side dashboard. Turn the key to the "On" position. Press the "Read" button on the scanner.

Write down all the codes you read. Cross-reference the codes to the code sheet that comes with the scanner. Write down the meaning of the codes. If a code does not appear on the code sheet but does appear on your list, circle it. This means the ECM is suspect.UPA USB If there are several codes that appear on your list, but when you compare them to the sheet, it seems clear that not that many things could be wrong with the engine at the same time, the ECM is also suspect.

Turn the ignition key to the "Off" position. Bring your wrench and set of sockets to the car. Remove the negative battery cable, using the appropriate wrench and set it aside, ensuring that it does not touch metal. Remove the passenger-side kick panel -- the panel by your feet on the side of the car, using the appropriate sockets.Vagcom 15.7 Remove the bolts holding the three wiring harness connectors onto the computer, using the appropriate socket.

Pull the connectors straight out from the computer, taking care not to bend the pins. Unbolt the computer from its bracket, using the appropriate socket. Remove the cover on the back of the computer, using the appropriate socket. Smell the computer. If it smells like dead fish, the computer is bad. Look for burned circuits -- burned circuits will have brown burn marks on or near them. If you see burned circuits, the computer is bad.