Potential Cause: Faulty Engine Control Module (ECM)
Symptoms:
- Engine cranks but doesn't start.
- Check Engine light is on.
- Engine may stall or run rough when idling.
- Fuel economy may decrease.
- Emissions may increase.
Troubleshooting:
1. Check the battery: Make sure the battery has enough power to start the engine. A weak battery can cause the ECM to malfunction.
2. Check the fuel system: Make sure the fuel system is delivering fuel to the engine. A clogged fuel filter or faulty fuel pump can prevent the engine from starting.
3. Check the ignition system: Make sure the ignition system is functioning properly. A faulty spark plug or ignition coil can prevent the engine from starting.
4. Check the ECM: If the battery, fuel system, and ignition system are all functioning properly, the ECM may be faulty.
Repair:
If the ECM is faulty, it will need to be replaced. Replacing the ECM is a complex and expensive repair, so it is important to be sure that the ECM is actually the cause of the problem before having it replaced.
Prevention:
There are no known ways to prevent the ECM from failing. However, regular maintenance can help to keep the ECM functioning properly. This includes changing the oil and filter regularly, using high-quality fuel, and avoiding driving in extreme weather conditions.
