DODGE RAM 1500 CRANKS BUT WON'T START DIAGNOSIS & FIX

Introduction

This tutorial provides a step-by-step guide to diagnosing and fixing a problem where a 2012 Dodge Ram 1500 with a V6 3.7L engine cranks but does not start. This issue can often be linked to a faulty fuel pump or related components. By following these steps, you can systematically identify the cause and apply the necessary fixes.

Step 1: Gather Necessary Tools

Before starting diagnostics, ensure you have the right tools on hand. Suggested tools include:

• Lisle 69300 Master Relay Test Jump Set
• Relay Switch Bypass Kit
• Fuse Buddy Mini Current Loop
• THINKTOOL PRO Bi-Directional OBD2 Scanner

These tools will help you test the electrical components and fuel system.

Step 2: Initial Observations

• Check the vehicle's dashboard for warning lights.
• Verify that the battery is in good condition and fully charged.
• Listen for the fuel pump priming sound when turning the ignition to the "ON" position.

Step 3: Test the Fuel Pump Relay

1. Locate the fuel pump relay in the fuse box.
2. Use the relay test jump set to bypass the relay:
   • Connect the jumper wires as per the instructions included with your tool.
   • If the fuel pump activates, the relay may be faulty.

Step 4: Check Fuel Pump Operation

1. Access the fuel pump:
   • Remove the access panel or fuel tank as needed.
2. Test the fuel pump:
   • Disconnect the fuel line and place a container beneath it.
   • Turn the ignition to the "ON" position to check for fuel flow.
   • If no fuel flows, the pump may need replacement.

Step 5: Inspect Fuel Lines and Filter

• Examine the fuel lines for any leaks, clogs, or damage.
• Check the fuel filter for blockages. A clogged filter can prevent fuel from reaching the engine.

Step 6: Scan for Diagnostic Trouble Codes

1. Connect the OBD2 scanner to the vehicle's diagnostic port.
2. Retrieve any stored codes that could indicate issues with the engine or fuel system.
3. Address any relevant codes found, which may guide you to further repairs.

Step 7: Perform Additional Tests if Necessary

• If issues persist, consider testing:
  • Crankshaft position sensor
  • Camshaft position sensor
  • Ignition system components

Conclusion

By following these steps, you can effectively diagnose the problem with your Dodge Ram 1500 that cranks but won't start. Always work safely and methodically to identify the root cause of the issue. If you find that the problem persists after following these steps, it may be beneficial to consult a professional mechanic for a more in-depth diagnosis.