Troubleshooting Nissan Murano Won't Start: Common Causes and Solutions (2024)

By Brian Wong, Reviewed by: Kurt Niebuhr, Updated on April 19, 2024

1. Introduction

The Nissan Murano is a popular mid-size crossover SUV that has been in production since 2003. It has gained a reputation for its sleek design, comfortable interior, and versatile performance. As with any vehicle, the Nissan Murano may encounter issues that can affect its performance, including starting problems. Understanding the potential causes of a Nissan Murano not starting can help owners diagnose and address these issues promptly.

One common cause of a Nissan Murano not starting is a faulty battery. A weak or dead battery can prevent the engine from turning over or provide insufficient power to the starter motor. Symptoms of a battery-related issue may include dim headlights, clicking sounds when turning the key, or no response at all. It is recommended to check the battery voltage using a multimeter to ensure it is within the appropriate range.

The fuel system is another area to investigate when troubleshooting a Nissan Murano that won't start. Insufficient fuel levels can occur due to oversight or leaks. It is essential to verify that the fuel tank has an adequate amount of fuel. If the fuel level is sufficient, the fuel pump may be the culprit. A malfunctioning fuel pump can result in a lack of fuel delivery to the engine, causing starting issues. Symptoms of a faulty fuel pump can include the engine not receiving fuel or experiencing a loss of power. Additionally, a clogged fuel filter or faulty fuel injectors can disrupt fuel flow, leading to rough idling, misfires, or a decrease in engine performance.

The ignition system plays a crucial role in starting the Nissan Murano. Worn or fouled spark plugs can prevent proper ignition, resulting in starting difficulties. Symptoms of faulty spark plugs can include misfires, rough idling, or poor acceleration. Ignition coils and wires are also susceptible to wear and tear, which can lead to inconsistent spark delivery. A malfunctioning ignition system may exhibit symptoms such as engine misfires, lack of power, or difficulty starting.

Other potential causes of a Nissan Murano not starting include issues with the security system, a malfunctioning engine control unit (ECU), or additional mechanical and electrical problems. A faulty immobilizer or key fob can prevent starting by disabling the ignition system. Malfunctions in the ECU can disrupt crucial engine functions, leading to starting difficulties or engine stalling. It's important to consider other possibilities such as a faulty ignition switch, damaged wiring, or sensor issues that may be affecting the starting process.

2. Check the Battery and Electrical System

2.1. Inspect the Battery

When troubleshooting a Nissan Murano that won't start, one of the primary areas to inspect is the battery and electrical system. A weak or dead battery can often be the cause of starting issues. Here are some steps to follow when inspecting the battery:

1. Check the battery visually: Begin by visually inspecting the battery for any visible signs of damage, such as corrosion, leakage, or loose connections. Ensure that the battery terminals are securely connected.

2. Test the battery voltage: To determine the health of the battery, you can use a multimeter to measure the battery voltage. Set the multimeter to the DC voltage setting and connect the positive (red) lead to the positive terminal of the battery and the negative (black) lead to the negative terminal. A fully charged battery typically reads around 12.6 volts. If the voltage is significantly lower, it may indicate a weak or discharged battery.

3. Attempt a jump-start: If the battery voltage is low, you can try jump-starting the vehicle. Connect the positive (red) jumper cable to the positive terminal of the Murano's battery and the other end to the positive terminal of a working vehicle's battery. Then, connect the negative (black) jumper cable to the negative terminal of the working vehicle's battery and the other end to a metal ground point on the Murano (e.g., a bolt or unpainted metal surface). Start the working vehicle and let it run for a few minutes, then attempt to start the Murano. If it starts successfully, it indicates that the battery was the issue.

4. Test the charging system: If the Murano starts after a jump-start but experiences starting issues again later, it could indicate a problem with the charging system. With the engine running, use the multimeter to measure the battery voltage. It should read around 13.5 to 14.7 volts. If the voltage is significantly lower or higher, it may indicate a faulty alternator or voltage regulator, which should be inspected by a professional.

5. Consider battery replacement: If the battery fails to hold a charge or exhibits other signs of significant deterioration, such as an old age or repeated starting issues, it may be necessary to replace it with a new one. Ensure that the replacement battery has the correct specifications for the Murano, including the correct voltage and size.

Inspecting the battery and electrical system is an important first step in diagnosing starting problems with a Nissan Murano. Remember to take safety precautions when working with the battery, such as wearing protective gloves and eyewear. If you are unsure about performing these inspections yourself, it is recommended to consult a qualified mechanic for a professional evaluation and necessary battery replacements.

2.2. Test the Battery Voltage

When troubleshooting a Nissan Murano that won't start, one crucial step is to test the battery voltage. This test helps determine the health and charge level of the battery. Here's a detailed guide on how to test the battery voltage:

1. Gather the necessary tools: To test the battery voltage, you will need a multimeter, also known as a volt-ohm meter (VOM). Ensure that the multimeter is set to the DC voltage setting.

2. Safety precautions: Before proceeding, it's important to take some safety precautions. Put on protective gloves and eyewear to protect yourself from any potential hazards while working with the battery.

3. Locate the battery: The battery is typically located in the engine compartment of the Nissan Murano. Refer to the owner's manual or consult a service manual if you're unsure about its location.

4. Turn off the engine and accessories: Ensure that the Murano's engine is turned off, and all electrical accessories, such as lights and the radio, are turned off as well. This will provide an accurate reading of the battery voltage.

5. Connect the multimeter: Take the multimeter and connect the positive (red) lead to the positive terminal of the battery. The positive terminal is usually marked with a "+" sign or a red cover. Then, connect the negative (black) lead to the negative terminal of the battery. The negative terminal is typically marked with a "-" sign or a black cover.

6. Read the battery voltage: Once the multimeter is properly connected, observe the reading on the display. A fully charged battery typically reads around 12.6 volts or slightly higher. If the voltage is significantly lower, it may indicate a weak or discharged battery. On the other hand, a voltage reading of 10 volts or less suggests a severely discharged battery.

7. Interpret the voltage readings: Understanding the voltage readings can provide insight into the condition of the battery. Here are some general guidelines:
- 12.6 volts or higher: The battery is fully charged or in good condition.
- 12.4 to 12.5 volts: The battery is about 75% charged.
- 12.2 to 12.3 volts: The battery is approximately 50% charged.
- 12.0 volts or lower: The battery may be discharged and requires recharging or replacement.

8. Disconnect the multimeter: Once you have recorded the battery voltage, disconnect the multimeter by removing the leads from the battery terminals. Start with the negative (black) lead, followed by the positive (red) lead.

Testing the battery voltage provides valuable information about the battery's charge level. If the voltage is low, attempting to recharge the battery may resolve the starting issue. However, if the battery consistently fails to hold a charge, it may be necessary to replace it with a new one.

Remember, this guide provides general instructions, and it's important to refer to the specific vehicle's manual for accurate information and any precautions specific to your Nissan Murano model. If you're unsure about performing the battery voltage test or need further assistance, it's recommended to consult a qualified mechanic or automotive technician for professional guidance.

2.3. Examine the Alternator and Starter

When troubleshooting a Nissan Murano that won't start, it is important to examine the alternator and starter as part of the battery and electrical system inspection. The alternator and starter play crucial roles in the vehicle's starting process. Here's a detailed guide on how to examine the alternator and starter:

1. Safety precautions: Before beginning any inspection or maintenance work, ensure the Murano's engine is turned off, and the key is removed from the ignition. Put on protective gloves and eyewear to prevent any accidents or injuries.

2. Examine the alternator: The alternator is responsible for charging the battery and powering the electrical systems of the vehicle while the engine is running. Start by visually inspecting the alternator for any visible signs of damage, such as loose connections, frayed wires, or worn-out belts. Check that the alternator is securely mounted and there are no signs of oil leaks or corrosion around it.

3. Inspect the alternator wiring: Examine the wiring connected to the alternator, including the positive and negative terminals. Ensure that the connections are tight and free of corrosion. Corroded or loose connections can prevent the alternator from functioning correctly.

4. Test the alternator output: With the engine running, you can perform a basic test to check the alternator output. Use a multimeter set to the DC voltage setting and connect the positive (red) lead to the positive terminal of the battery and the negative (black) lead to the negative terminal. The multimeter should display a voltage reading between 13.5 and 14.7 volts if the alternator is operating properly. If the voltage reading is significantly lower or higher, it may indicate a faulty alternator that requires further inspection or professional assistance.

5. Inspect the starter: The starter motor is responsible for cranking the engine and initiating the combustion process. Visually inspect the starter for any signs of damage, such as loose connections, worn-out wires, or excessive dirt and debris. Check that the starter is securely mounted and there are no leaks or damage to the surrounding components.

6. Listen for starter noises: While attempting to start the Murano, listen for any unusual noises coming from the starter. Grinding, clicking, or whirring sounds may indicate a faulty starter motor or a problem with the starter solenoid.

7. Check starter connections: Examine the wiring and connections attached to the starter. Ensure that the connections are tight and free of corrosion. Corroded or loose connections can prevent the starter from receiving the necessary power to crank the engine.

8. Test the starter motor: If the starter motor is suspected to be faulty, it can be tested using a specialized starter motor test machine or by consulting a professional mechanic. Testing the starter motor's performance and electrical draw can help determine if it needs to be repaired or replaced.

By examining the alternator and starter, you can identify any potential issues that may be causing the Nissan Murano not to start. If you observe any significant damage, loose connections, or suspect a malfunction, it is recommended to consult a qualified mechanic or automotive technician for further inspection and necessary repairs or replacements. They have the expertise and specialized equipment to accurately diagnose and address alternator and starter-related problems.

3. Fuel System Inspection

3.1. Check Fuel Level

When troubleshooting a Nissan Murano that won't start, it is essential to check the fuel level as part of the fuel system inspection. Insufficient fuel levels can cause starting issues and prevent the engine from firing up. Here's a detailed guide on how to check the fuel level:

1. Park the vehicle on a level surface: Ensure that the Murano is parked on a flat surface to obtain an accurate reading of the fuel level.

2. Locate the fuel gauge: The fuel gauge is typically located on the dashboard, near the speedometer or within the instrument cluster. It provides a visual representation of the fuel level in the tank.

3. Observe the fuel gauge: With the ignition turned on, take note of the position of the fuel gauge needle or the digital fuel level display. The gauge usually ranges from "Empty" or "E" to "Full" or "F." If the fuel level is close to or at the "Empty" mark, it may indicate that the fuel tank needs to be refueled.

4. Refuel the vehicle: If the fuel level is low or near "Empty," it is necessary to refuel the Murano. Locate a nearby gas station and follow proper refueling procedures. Open the fuel door, insert the fuel nozzle into the fuel filler neck, and select the appropriate fuel grade for your Murano. Fill the tank until the nozzle automatically shuts off, indicating that the tank is full.

5. Check for fuel leaks: After refueling, inspect the area around the fuel tank and the fuel filler neck for any signs of fuel leaks. Look for the smell of gasoline or any visible wet spots or drips. If you notice a fuel leak, it is crucial to address the issue immediately and seek professional assistance, as fuel leaks can be dangerous.

6. Attempt to start the Murano: After refueling, attempt to start the vehicle. If the starting issue was due to low fuel, the engine should now start without any problems. However, if the Murano still won't start, it may indicate an issue beyond the fuel level, and further investigation is necessary.

Checking the fuel level is a straightforward step in troubleshooting a Nissan Murano that won't start. It is important to ensure an adequate fuel supply to the engine. If the fuel level is low, refueling should be the first course of action. However, if the fuel tank is filled, and the starting problem persists, other areas of the fuel system, such as the fuel pump, fuel filter, or injectors, may require inspection by a qualified mechanic or automotive technician. They can provide a more in-depth diagnosis and necessary repairs to address fuel system-related issues.

3.2. Verify Fuel Pump Functionality

When troubleshooting a Nissan Murano that won't start, verifying the functionality of the fuel pump is a crucial step in the fuel system inspection. The fuel pump is responsible for delivering fuel from the tank to the engine, and a malfunctioning fuel pump can prevent proper fuel delivery and cause starting issues. Here's a detailed guide on how to verify the fuel pump functionality:

1. Safety precautions: Before starting any inspection or maintenance work, ensure that the Murano's engine is turned off, and the key is removed from the ignition. Put on protective gloves and eyewear to prevent any accidents or injuries.

2. Locate the fuel pump relay and fuse: The fuel pump relay and fuse are typically located in the engine compartment fuse box. Refer to the owner's manual or the fuse box cover for the exact location and identification of the fuel pump relay and fuse.

3. Inspect the fuel pump relay and fuse: Visually inspect the fuel pump relay and fuse for any signs of damage, such as melted plastic, loose connections, or a blown fuse. If the relay or fuse appears damaged, it may indicate a problem with the fuel pump circuit, and the faulty component should be replaced.

4. Check for power supply to the fuel pump: With the ignition turned on, use a multimeter set to the DC voltage setting to check if power is being supplied to the fuel pump. Locate the fuel pump electrical connector, which is usually found near the fuel tank or along the fuel line. Connect the positive (red) lead of the multimeter to the power supply wire and the negative (black) lead to a known ground point. A voltage reading of approximately 12 volts should be present. If there is no voltage, it suggests an issue with the power supply to the fuel pump.

5. Listen for the fuel pump operation: While an assistant turns the ignition key to the "ON" position (without starting the engine), listen for a faint humming sound coming from the fuel tank. This sound indicates that the fuel pump is functioning correctly. If you don't hear any noise, it may indicate a faulty fuel pump that needs to be replaced.

6. Check fuel pressure: If the fuel pump appears to be operational but the Murano still won't start, it is advisable to check the fuel pressure using a fuel pressure gauge. This requires specialized equipment and is typically performed by a professional mechanic or automotive technician. Proper fuel pressure ensures adequate fuel delivery to the engine for combustion.

7. Inspect fuel lines and connections: While inspecting the fuel pump, visually inspect the fuel lines and connections for any signs of leaks, cracks, or loose fittings. Fuel leaks or damaged lines can result in insufficient fuel reaching the engine, causing starting issues.

Verifying the functionality of the fuel pump is an important step in troubleshooting a Nissan Murano that won't start. If any issues are detected during the inspection, it is recommended to consult a qualified mechanic or automotive technician for further diagnosis and necessary repairs. They have the expertise and specialized tools to accurately assess the fuel pump and fuel system to resolve starting problems effectively.

3.3. Inspect Fuel Filter and Injectors

When troubleshooting a Nissan Murano that won't start, inspecting the fuel filter and injectors is an important step in the fuel system inspection. The fuel filter and injectors play vital roles in ensuring proper fuel flow and combustion within the engine. Here's a detailed guide on how to inspect the fuel filter and injectors:

1. Safety precautions: Before starting any inspection or maintenance work, ensure that the Murano's engine is turned off, and the key is removed from the ignition. Put on protective gloves and eyewear to prevent any accidents or injuries.

2. Locate the fuel filter: The fuel filter in the Nissan Murano is typically located along the fuel line, either underneath the vehicle or in the engine compartment. Consult the owner's manual or a service manual to determine the exact location.

3. Inspect the fuel filter: Visually inspect the fuel filter for any signs of damage, such as cracks, leaks, or clogs. A clogged or dirty fuel filter can restrict fuel flow and cause starting issues. If the fuel filter appears damaged or excessively dirty, it should be replaced with a new one.

4. Remove and replace the fuel filter: If the fuel filter needs to be replaced, carefully follow the manufacturer's instructions or consult a service manual for the specific Murano model. Relieve the fuel system pressure, disconnect the fuel lines from the filter, and remove the old filter. Install the new filter, ensuring the correct orientation and proper connection of the fuel lines.

5. Inspect the fuel injectors: The fuel injectors are responsible for delivering fuel to the engine in a precise spray pattern for optimal combustion. Visually inspect the fuel injectors for any signs of leaks, clogs, or damage. Look for wet spots, signs of fuel leakage, or excessive dirt or debris around the injectors. If any issues are detected, further inspection or professional assistance may be required.

6. Clean the fuel injectors: Over time, fuel injectors can become clogged or dirty, affecting their performance. If no visible issues are detected, but the Murano still experiences starting problems, it may be necessary to clean the fuel injectors. Professional fuel injector cleaning services or fuel injector cleaning kits are available, which use specialized cleaning solutions to remove deposits and restore injector functionality.

7. Consider professional diagnosis: If inspecting the fuel filter and injectors does not resolve the starting issue, it is advisable to consult a qualified mechanic or automotive technician for a more in-depth diagnosis. They have the expertise and diagnostic tools to perform fuel system tests, such as fuel pressure tests or injector flow tests, to pinpoint any underlying problems accurately.

Inspecting the fuel filter and injectors is an essential step in troubleshooting a Nissan Murano that won't start. By ensuring a clean and unobstructed fuel flow, you can promote proper combustion and improve starting performance. If any issues are identified during the inspection, timely replacement or cleaning of the fuel filter and injectors can help resolve starting problems. However, if the starting issue persists, professional assistance should be sought for further diagnosis and necessary repairs.

4. Ignition System Examination

4.1. Check Spark Plugs

When troubleshooting a Nissan Murano that won't start, checking the spark plugs is an important step in the ignition system examination. Spark plugs play a crucial role in igniting the air-fuel mixture in the engine cylinders, and faulty spark plugs can lead to starting issues. Here's a detailed guide on how to check the spark plugs:

1. Safety precautions: Before starting any inspection or maintenance work, ensure that the Murano's engine is turned off, and the key is removed from the ignition. Put on protective gloves and eyewear to prevent any accidents or injuries.

2. Locate the spark plugs: The spark plugs are typically located on the engine cylinder head, and their number depends on the specific engine configuration. Consult the owner's manual or a service manual to determine the exact location and number of spark plugs.

3. Remove the spark plug wires or ignition coil: Depending on the Murano's engine, you may need to remove the spark plug wires or ignition coil to access the spark plugs. Carefully disconnect the wires or coil following the proper procedure, taking note of their positions for reinstallation.

4. Inspect the spark plugs: Visually inspect each spark plug for any signs of damage or wear. Look for worn electrodes, excessive carbon deposits, oil fouling, or corrosion. These issues can hinder the spark plug's ability to produce a strong spark for ignition.

5. Check the spark plug gap: The spark plug gap refers to the distance between the center electrode and the ground electrode. Use a spark plug gap tool to measure the gap, comparing it to the manufacturer's specifications. If the gap is too wide or too narrow, it may affect the spark plug's performance and should be adjusted accordingly or replaced.

6. Clean or replace the spark plugs: If the spark plugs appear dirty, fouled, or damaged, they may need cleaning or replacement. Cleaning can be done using a spark plug cleaner or wire brush to remove carbon deposits and dirt. However, if the spark plugs are heavily worn or damaged, it is advisable to replace them with new ones.

7. Reinstall the spark plugs and wires or ignition coil: Once the spark plugs have been cleaned or replaced, carefully reinstall them into their respective cylinder heads. Ensure proper tightening, but avoid overtightening, as it can damage the spark plugs or cylinder head threads. Reconnect the spark plug wires or ignition coil following the correct order and orientation.

8. Consider professional assistance: If checking and cleaning/replacing the spark plugs does not resolve the starting issue, it may be necessary to consult a qualified mechanic or automotive technician for further diagnosis. They can perform additional tests, such as spark plug spark tests or ignition system inspections, to identify any underlying ignition system problems.

Checking the spark plugs is a vital step in troubleshooting a Nissan Murano that won't start. By ensuring the spark plugs are in good condition and properly gapped, you can promote reliable ignition and improve starting performance. If any issues are identified during the inspection, timely cleaning or replacement of the spark plugs can help address starting problems. However, if the starting issue persists, professional assistance should be sought for a more comprehensive ignition system examination and necessary repairs.

4.2. Inspect Ignition Coils and Wires

When troubleshooting a Nissan Murano that won't start, inspecting the ignition coils and wires is an important step in the ignition system examination. The ignition coils are responsible for converting the low voltage from the battery into a high voltage needed to create a spark at the spark plugs. The ignition wires, also known as spark plug wires, deliver the high voltage from the ignition coil to the spark plugs. Here's a detailed guide on how to inspect the ignition coils and wires:

1. Safety precautions: Before starting any inspection or maintenance work, ensure that the Murano's engine is turned off, and the key is removed from the ignition. Put on protective gloves and eyewear to prevent any accidents or injuries.

2. Locate the ignition coils: The ignition coils are typically mounted on or near the engine cylinder head. Depending on the Murano's engine, there may be individual ignition coils for each spark plug or a single coil pack that serves multiple cylinders. Consult the owner's manual or a service manual to determine the exact location of the ignition coils.

3. Inspect the ignition coils: Visually inspect each ignition coil for any signs of damage, such as cracks, melted plastic, or corrosion. Damaged or faulty ignition coils can result in a weak or no spark, leading to starting issues. If any issues are detected, the ignition coil may need to be replaced.

4. Check the ignition wires: Follow the ignition wires from the ignition coils to the spark plugs. Inspect the wires for any signs of wear, cracks, or damage. Damaged ignition wires can cause a loss of spark or crossfire, resulting in starting problems. If the ignition wires appear worn or damaged, they should be replaced.

5. Inspect wire connections: Ensure that the ignition wires are securely connected to both the ignition coil and the spark plugs. Loose or improperly connected wires can cause intermittent spark or no spark at all. If any connections are loose, reseat them properly.

6. Perform a spark test: With the ignition coils and wires visually inspected, you can perform a spark test to verify their functionality. Start by disconnecting one ignition wire from its spark plug. Insert a spark plug tester into the wire, and then ground the tester to a metal part of the engine. Have an assistant crank the engine while you observe the tester for a strong, visible spark. Repeat this test for each ignition wire. If a weak or no spark is observed, it may indicate a faulty ignition coil or wire.

7. Consider professional assistance: If inspecting the ignition coils and wires does not resolve the starting issue, it is advisable to consult a qualified mechanic or automotive technician for further diagnosis. They have the expertise and diagnostic tools to perform advanced tests, such as coil resistance tests or oscilloscope readings, to accurately assess the ignition system and determine any underlying problems.

Inspecting the ignition coils and wires is an important step in troubleshooting a Nissan Murano that won't start. By ensuring that these components are in good condition and properly connected, you can promote reliable spark generation and improve starting performance. If any issues are identified during the inspection, timely replacement of faulty ignition coils or wires can help address starting problems. However, if the starting issue persists, professional assistance should be sought for a more comprehensive ignition system examination and necessary repairs.

5. Other Potential Causes

5.1. Security System Malfunction

When troubleshooting a Nissan Murano that won't start, a security system malfunction can be one of the potential causes. The security system is designed to prevent unauthorized access to the vehicle and may sometimes trigger false alarms or malfunctions that can interfere with the starting process. Here's a detailed guide on how to address a security system malfunction in the Nissan Murano:

1. Check the key fob battery: A weak or dead battery in the key fob can cause communication issues between the key and the vehicle's security system. Replace the key fob battery with a new one and ensure it is properly inserted.

2. Try a spare key: If available, try starting the Murano with a spare key. A malfunctioning key fob or a key with a damaged transponder chip can prevent the security system from recognizing the correct authorization signal.

3. Reset the security system: Some security system malfunctions can be resolved by resetting the system. Start by disconnecting the vehicle's battery for about 15 minutes. Reconnect the battery and try starting the Murano again. This process can help reset the security system and resolve minor glitches.

4. Check for security system indicators: Look for any security system indicators on the dashboard or instrument cluster. These indicators can provide valuable information about the status of the security system. Refer to the owner's manual or a service manual for the specific meaning of each indicator.

5. Check for immobilizer issues: The Murano may be equipped with an immobilizer system that prevents the engine from starting without the correct key. If the immobilizer system malfunctions or fails to recognize the key, it can prevent the engine from starting. In such cases, professional assistance may be required to diagnose and repair the immobilizer system.

6. Inspect the door locks: Faulty or malfunctioning door locks can trigger the security system and prevent the engine from starting. Check that all doors are fully closed and locked. Lubricate the door locks if they appear stiff or difficult to operate.

7. Consult the owner's manual: The owner's manual provides specific information about the security system in the Nissan Murano. Refer to the manual for troubleshooting tips, security system reset procedures, or any known issues related to the security system.

8. Seek professional assistance: If the security system malfunction persists or you are unable to diagnose the issue on your own, it is recommended to consult a qualified mechanic or authorized Nissan service center. They have the necessary expertise and diagnostic tools to accurately diagnose and repair security system malfunctions.

A security system malfunction can be a potential cause of a Nissan Murano not starting. By following these steps and addressing any issues with the key fob, key, immobilizer, or door locks, you can potentially resolve security system-related starting problems. If the problem persists, professional assistance should be sought for a more in-depth diagnosis and repair.

5.2. Check Engine Control Unit (ECU)

When troubleshooting a Nissan Murano that won't start, checking the Engine Control Unit (ECU) is another potential step to consider. The ECU, also known as the engine control module, is responsible for managing various engine functions and systems. A malfunctioning ECU can disrupt the starting process and prevent the engine from running properly. Here's a detailed guide on how to check the ECU:

1. Safety precautions: Before working on the ECU or any electrical components, ensure that the Murano's engine is turned off, and the key is removed from the ignition. It is also recommended to disconnect the vehicle's battery to prevent any electrical mishaps.

2. Locate the ECU: The ECU is typically located in the engine compartment, but its exact position may vary depending on the Murano's model and year. Consult the owner's manual or a service manual to determine the specific location of the ECU.

3. Inspect the ECU connections: Carefully examine the wiring harness and connectors attached to the ECU. Look for any loose, damaged, or corroded connections. Faulty connections can disrupt the communication between the ECU and other engine components, affecting the starting process. If any issues are detected, repair or replace the affected connectors.

4. Check for ECU error codes: The ECU is designed to store error codes when it detects a problem with the engine or related systems. Use an OBD-II scanner or a compatible diagnostic tool to retrieve the stored error codes from the ECU. The error codes can provide valuable insight into the specific issues affecting the starting process.

5. Clear ECU error codes: After recording the error codes, clear them from the ECU's memory using the diagnostic tool. Clearing the error codes will reset the ECU and allow you to monitor if any new codes reappear during subsequent starting attempts.

6. Perform an ECU reset: An ECU reset can help recalibrate the ECU and restore its default settings. To perform an ECU reset, disconnect the vehicle's battery and leave it disconnected for approximately 15 minutes. Reconnect the battery and try starting the Murano again. This process can help reset the ECU and potentially resolve starting issues caused by minor ECU glitches.

7. Consider professional assistance: If inspecting and resetting the ECU does not resolve the starting problem, it is advisable to consult a qualified mechanic or authorized Nissan service center. They have the expertise and specialized diagnostic equipment to perform advanced ECU tests, such as ECU reprogramming or replacement, to accurately diagnose and repair ECU-related issues.

Checking the Engine Control Unit (ECU) is an important step when troubleshooting a Nissan Murano that won't start. By inspecting the ECU connections, retrieving and clearing error codes, and performing an ECU reset, you can potentially address starting issues caused by ECU malfunctions. If the problem persists, professional assistance should be sought for a more in-depth diagnosis and repair of the ECU or related components.

5.3. Additional Mechanical or Electrical Problems

When troubleshooting a Nissan Murano that won't start, there can be additional mechanical or electrical problems that may cause the issue. While the previous sections covered some common causes, it's important to consider other potential factors. Here are some additional problems to investigate:

1. Check the fuel pump relay: A faulty fuel pump relay can prevent the fuel pump from receiving power, resulting in a no-start condition. Locate the fuel pump relay in the fuse box or relay panel. Inspect the relay for signs of damage or corrosion. If necessary, replace the relay with a new one.

2. Test the crankshaft position sensor: The crankshaft position sensor provides information about the engine's rotational speed and position. A malfunctioning sensor can disrupt the ignition and fuel delivery, leading to starting issues. Use a multimeter to test the sensor's resistance and voltage output according to the manufacturer's specifications. If the readings are outside the recommended range, the sensor may need to be replaced.

3. Inspect the camshaft position sensor: Similar to the crankshaft position sensor, the camshaft position sensor plays a crucial role in the engine's operation. It provides data about the position and speed of the camshaft. A faulty camshaft position sensor can affect the ignition timing and fuel injection, resulting in starting problems. Test the sensor's resistance and voltage output, and replace it if necessary.

4. Check the engine coolant temperature sensor: The engine coolant temperature sensor monitors the temperature of the engine coolant. If the sensor malfunctions or provides incorrect readings, it can affect the fuel mixture and ignition timing, causing starting difficulties. Use a multimeter to check the sensor's resistance and compare it to the manufacturer's specifications. Replace the sensor if it is out of range.

5. Inspect the timing belt/chain: A worn or broken timing belt/chain can cause the engine's valves and pistons to fall out of sync, leading to a no-start condition. Refer to the owner's manual or service manual for the recommended inspection interval and procedure for the timing belt/chain. If necessary, have a qualified mechanic inspect and replace the timing belt/chain.

6. Test the starter motor: The starter motor is responsible for cranking the engine. A faulty starter motor can prevent the engine from starting. Check for any clicking sounds or grinding noises when attempting to start the Murano. If the starter motor does not engage or spins excessively, it may need to be repaired or replaced.

7. Verify the ignition switch: The ignition switch is responsible for activating the electrical systems and starting the engine. A malfunctioning ignition switch can prevent power from reaching the starter motor and other vital components. Inspect the ignition switch for any signs of damage or wear. If necessary, have a qualified technician test and replace the ignition switch.

8. Check for immobilizer issues: The Murano's immobilizer system may have a fault that prevents the engine from starting. If the immobilizer system is malfunctioning or fails to recognize the key, it can disrupt the starting process. Consult the owner's manual or seek professional assistance to diagnose and address immobilizer-related issues.

It's important to note that troubleshooting and diagnosing additional mechanical or electrical problems may require specialized tools and expertise. If the starting issue persists after checking the items mentioned above, it is recommended to consult a qualified mechanic or authorized Nissan service center for further diagnosis and resolution of the problem.

6. Conclusion

In conclusion, troubleshooting a Nissan Murano that won't start requires a systematic approach to identify and address the underlying causes. By following the steps outlined in this guide, you can diagnose and potentially resolve issues related to the battery and electrical system, fuel system, ignition system, security system, ECU, and other potential mechanical or electrical problems.

It's important to start with basic checks, such as inspecting the battery, verifying the fuel level, and examining the spark plugs. These initial steps can often identify simple issues that can be easily resolved. Moving forward, testing the battery voltage, inspecting the alternator and starter, checking the fuel pump functionality, and examining the fuel filter and injectors can help pinpoint problems related to these components.

Additionally, inspecting the ignition coils and wires, considering security system malfunctions, checking the Engine Control Unit (ECU), and addressing other potential mechanical or electrical problems provide a comprehensive approach to troubleshooting a no-start issue in the Nissan Murano.

It is crucial to remember that these troubleshooting steps are intended as a general guide. Each vehicle may have unique characteristics and specific requirements, and it is recommended to consult the owner's manual or seek professional assistance for accurate diagnosis and resolution.

By thoroughly inspecting and testing various systems and components, you can narrow down the potential causes of a no-start condition in the Nissan Murano and take appropriate steps to address them. Remember to exercise caution when working with electrical components and, if necessary, consult a qualified mechanic or authorized Nissan service center for further assistance.

Frequently Asked Questions (FAQ) About Nissan Murano Starting Issues

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Updated on April 19, 2024