Check engine light is on and the car hardly can't start..Suzuki vitara.How can i know what the problem is?

you must test this procedure. God bless you
When you turn the ignition ON before starting the car, the "Check engine" light is supposed to come on indicating that the engine computer (also could be called ECM, PCM, or ECU) is powered on. If the "Check engine" light does not come with the ignition ON, it's possible that there is no power coming to the engine computer (e.g., due to a broken wire, faulty main relay, burnt fuse, etc.) or that there is a problem with the engine computer itself.

The check engine light is because all check engine light codes are caused by components that affect emissions. It's not actually an engine problem, it's a problem with either your O2 sensor, MAF sensor, fuel/air ratio, pyrometer, or exhaust.

obd2 scanner

You'll have to figure out if it is a fuel or ignition problem.
Is the check engine light on ?
could be several things including the fuel pump, pump relay, ignition module, or coil

You must have the engine control module scanned for fault codes first to see what might be causing this.

The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light (or Service Engine Soon or small picture of an engine) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested

It may to check the glow main fuse first,while I head for my diagrams and check further for this.Let us know any info on vehicle running or starting prior to this fault.

Take the car to an autoparts store and have them scan the computer for any fault codes stored. The check engine light is to alert you that the computer has noted a fault in one of the car's systems. Getting the codes will show what the computer has noted and curb the need for speculation. Most parts stores will perform the scan for free. Hope this helped and best wishes.

Check if there's a spark in the cable going to the distributor. If there's none then you may have a problem in the ignition system components. A defective air flow sensor can also cause a no start. If spark is present, you may want to visit the fuel system of your car.

Take your rig.. drive it to a gas station.. fill the tank up with gas.. also fill 2 jugs of gasoline at the same time... put the jugs in the back of it.. now drive as far as you can until the rig runs out of gas.. then, take the two jugs of gas.. pour it all over the rig, inside and out.. now light it a-blaze, then walk to your nearest car dealer and buy a new car..

sounds like a dead cylender. check fire, plugs,compression. if all test well could be a partialy clogged injector.