1. Check the Fuses: Start with the simplest things first. Consult your owner's manual to locate the fuse(s) related to the ignition system (often labeled "ignition," "ECM," or similar). Check them for continuity with a test light or multimeter. Replace any blown fuses.
2. Ignition Switch: A faulty ignition switch can prevent power from reaching the coil. With the key in the "ON" position, check for power at the ignition switch's output wires using a multimeter. If no power is present, the switch is likely the culprit.
3. Crankshaft Position Sensor (CKP Sensor): The CKP sensor tells the computer the engine's rotational position. If it's malfunctioning, the computer won't send the signal to fire the coil. This sensor is often located on the engine block near the crankshaft. You'll need a multimeter to check its output signal (consult a wiring diagram).
4. Cam Position Sensor (CMP Sensor): Similar to the CKP sensor, a faulty CMP sensor can prevent the ignition system from functioning. This sensor is typically located on the camshaft. Test this sensor with a multimeter, referencing a wiring diagram.
5. Power Distribution Module (PDM) or Engine Control Module (ECM): These modules control various electrical functions, including the ignition system. A faulty PDM or ECM can prevent power from reaching the coil. Diagnosing these requires more advanced testing tools or a professional mechanic.
6. Wiring Harness: Inspect the wiring harness leading to the coil for any damage, breaks, or corrosion. A broken wire can interrupt the power flow. Repair or replace any damaged wiring.
7. Coil itself: While less likely if there's no power reaching it, a faulty coil is possible. However, you should check for power *before* testing the coil itself.
8. Relays: There might be relays involved in the ignition system's power circuit. Check these for proper operation.
Tools You'll Need:
* Test light: To check for power at various points in the system.
* Multimeter: To measure voltage and continuity.
* Wiring diagram: Essential for tracing wires and identifying components. A Haynes or Chilton repair manual for your specific year and model Dodge Spirit will be very helpful.
Important Considerations:
* Safety First: Disconnect the negative battery terminal before performing any electrical testing.
* Wiring Diagram: A wiring diagram is crucial for tracing the power path to the coil. Without one, troubleshooting will be significantly more difficult.
* Professional Help: If you're not comfortable working with automotive electrical systems, it's best to take your car to a qualified mechanic.
By systematically checking these components, you should be able to pinpoint the cause of the problem. Remember to consult a wiring diagram for your specific vehicle to accurately test each component.
