This video is about troubleshooting the problem of ECU/ECM of maruti 800 car and also for the check engine light problem.
If the ECU/ECM is faulty then the check engine light will not show any light in the meter cluster and the car will not start with the bad ecu. First of all you need to be sure you have a good battery with 12 volt + and then check all the wires if they are properly connected without any breakdown.
Then make sure your relays are working , swap then to check if they are good , then turn the key to start position and check the voltage coming to the relays as there should be 3 out 4 wires should have voltage on fuel pump relay when the key is at on position .
If you got the voltage then its good if not then that means there could be a wire breakdown or ecu fault, to ensure that check the voltage output from the ECU/ECM on the 2 wires of same color black in red stripe one , both should have 12 volt + in it. if not then the ECU/ECM is faulty.
After going throw all the process if you found out that the ECU/ECM is faulty then make a repair to it or replace ir, then check if it resolve the problem.
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Hope this video is helpful for you
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