Jeep Cherokee Crank No Start

Introduction

This tutorial will guide you through diagnosing and replacing a faulty camshaft position sensor on a Jeep Cherokee. A malfunctioning camshaft position sensor can cause your engine to crank but not start, leading to frustrating situations. By following these steps, you can efficiently identify the issue and perform the necessary repairs.

Step 1: Gather Required Tools and Materials

Before starting the diagnosis, ensure you have the following tools and materials:

• OBD-II scanner (for diagnosing error codes)
• Multimeter (for electrical testing)
• Wrenches and sockets (to remove the sensor)
• Replacement camshaft position sensor
• Safety gloves and goggles
• Shop towels for cleanup

Step 2: Diagnose the Camshaft Position Sensor

To confirm that the camshaft position sensor is the issue, follow these steps:

1. Connect the OBD-II Scanner

   • Plug the scanner into the vehicle's OBD-II port.
   • Turn on the ignition but do not start the engine.

2. Read Error Codes

   • Check for any error codes related to the camshaft position sensor.
   • Common codes include P0340 (Camshaft Position Sensor Circuit Malfunction) and P0344 (Intermittent Camshaft Position Sensor Signal).

3. Use a Multimeter for Testing

   • Disconnect the sensor's electrical connector.
   • Set the multimeter to the ohms setting.
   • Measure the resistance between the sensor terminals.
   • Consult the vehicle's specifications for acceptable resistance values.

4. Inspect Wiring and Connectors

   • Check for damaged wires or corroded connectors leading to the camshaft position sensor.
   • Repair any visible issues before replacing the sensor.

Step 3: Replace the Camshaft Position Sensor

If the sensor has been confirmed as faulty, proceed with the replacement:

1. Locate the Camshaft Position Sensor

   • Refer to the vehicle's manual for the exact location of the sensor on your Jeep Cherokee.

2. Remove the Old Sensor

   • Disconnect the electrical connector from the sensor.
   • Use the appropriate wrench or socket to remove the mounting bolts.
   • Carefully pull the sensor out of its housing.

3. Install the New Sensor

   • Apply a small amount of oil on the O-ring of the new sensor to ensure a proper seal.
   • Insert the new sensor into the housing and secure it with the mounting bolts.
   • Reconnect the electrical connector.

Step 4: Test the New Sensor

After installation, it's essential to verify that the new sensor is functioning correctly:

1. Start the Engine

   • Turn the ignition key to start the engine.
   • Observe if the engine starts smoothly.

2. Recheck with the OBD-II Scanner

   • Use the scanner again to check for any new error codes.
   • Ensure that the previous codes related to the camshaft position sensor are cleared.

Conclusion

You have successfully diagnosed and replaced the camshaft position sensor on your Jeep Cherokee. Regular maintenance and timely repairs can help avoid future starting issues. If the problem persists after replacing the sensor, consider consulting a professional mechanic for further diagnosis. Always keep your vehicle’s manual handy for specific instructions and specifications.