1. No Spark:
* Ignition Coil: This is a common culprit. Test the coil's primary and secondary windings for continuity and resistance using a multimeter. You'll need a wiring diagram to identify the correct terminals. A bad coil will either not produce voltage or have very low output.
* Ignition Control Module (ICM): This module controls the ignition coil. A faulty ICM can prevent the coil from firing. Testing this requires more specialized equipment and knowledge or consulting a repair manual.
* Crankshaft Position Sensor (CKP): This sensor tells the ICM the engine's rotational position, which is crucial for timing the spark. A bad CKP sensor will prevent the engine from starting. Testing involves checking for voltage and signal output using a multimeter and possibly an oscilloscope (for signal waveform analysis).
* Cam Position Sensor (CMP): Some models use a CMP sensor in addition to or instead of a CKP sensor. Similar testing applies as with the CKP sensor.
* Distributor (If equipped): Older Dakotas may have distributors. Check the rotor, cap, and wires for wear, cracks, or corrosion. A bad distributor cap or rotor can cause intermittent or no spark.
* Ignition Switch: A faulty ignition switch might not be sending power to the necessary components.
* Wiring: Check all wiring related to the ignition system for shorts, breaks, or loose connections. Look carefully at the connections at the coil, sensors, and distributor (if equipped).
2. No Fuel:
* Fuel Pump: This is the most common cause of no fuel. Listen for the fuel pump's whine when you turn the key to the "on" position (not starting). If you don't hear it, it could be faulty, or the relay or fuse supplying it could be bad. You can also check fuel pressure at the fuel rail with a fuel pressure gauge.
* Fuel Pump Relay: A bad relay will not allow power to reach the fuel pump. Try swapping the relay with a known good one from another circuit (check your owner's manual for relay locations and functions).
* Fuel Filter: A clogged fuel filter restricts fuel flow. Replace the filter if it's old or dirty.
* Fuel Injectors: Though less likely to cause a complete no-start, faulty injectors can prevent fuel delivery. This requires more advanced diagnostic testing.
* Computer (PCM): The Powertrain Control Module can cut off fuel delivery if it detects a problem. This usually is accompanied by other symptoms (check engine light). Diagnostics with a scan tool are necessary.
* Fuel Pump Fuse: Check for a blown fuse in the fuse box.
Troubleshooting Steps:
1. Check the basics: Make sure the battery has a good charge, the battery cables are clean and tight, and the grounds are secure.
2. Listen for the fuel pump: Turn the key to the "on" position. Do you hear it prime?
3. Check for spark: Remove a spark plug wire, hold the wire end near the engine block (grounded), and have someone crank the engine. Look for a spark. If you have no spark, focus on the ignition system.
4. Check fuses and relays: Inspect relevant fuses and relays.
5. Use a multimeter: Test components as described above. You'll need a multimeter to test voltage, continuity, and resistance.
6. Consult a repair manual: A repair manual for your specific year and model Dakota is invaluable for wiring diagrams and component testing procedures.
If you're not comfortable working with automotive electrical systems, it's best to take the vehicle to a qualified mechanic. Improper diagnosis and repair could lead to further damage or injury.
