Possible reasons why electrics prevent the car from starting:
1. Dead battery
* Check the battery with a voltmeter. The voltage must be at least 12.6 V.
* If the battery is low, start the car using the cigarette lighter cords or replace the battery.
2. Faulty starter
* When you turn the key, you hear a click, but the engine does not start.
* Check the starter by knocking on its housing. If the engine starts, replace the starter.
* Check the voltage at the starter using a voltmeter. It must be at least 12 V.
3. Problems with the ignition system
* Faulty spark plugs, ignition wires or ignition coil may prevent the engine from starting.
* Check spark plugs and wires visually for damage.
*Use a multimeter to check the voltage at the ignition coil.
4. Faulty crankshaft position sensor
* The crankshaft position sensor tells the ignition system when to fire the spark plugs.
* A faulty sensor can lead to misfiring or complete starting failure.
* Scan the vehicle for trouble codes that may indicate a faulty crankshaft position sensor.
5. Wiring problems
* Broken, corroded or damaged wires can disrupt the electrical system and prevent the engine from starting.
* Visually inspect the wiring for damage.
* Use a multimeter to check the integrity of the wires.
6. Faulty immobilizer
* An immobilizer is an anti-theft device that can prevent the engine from starting if it does not recognize the correct key.
* Check the immobilizer indicator on the dashboard. It should go out after inserting the key.
* If the immobilizer light remains illuminated, contact a qualified mechanic.
7. Faulty engine control unit (ECU)
* The ECU controls many of the vehicle’s electrical systems, including the ignition system and fuel injection system.
* A faulty ECU can lead to starting problems or even complete engine failure.
* Have ECU problems diagnosed by a qualified mechanic.