Engine management system on a crossover Nissan Murano first generation (body Z50) is a complex mechanism where the synchronization of the operation of the injectors and the ignition system directly depends on the signals from the position sensors. One of the key elements here is the crankshaft position sensor (CPS), which is often called the synchronization sensor. Without its correct operation, the electronic control unit simply will not be able to determine the moment of fuel injection and spark formation, which will lead to the inability to start the engine or its unstable operation.
Owners of a crossover with an engine VQ35DE Often faced with a situation where the car suddenly stalls or refuses to start after a long period of parking. In most cases, the problem lies precisely in the failure crankshaft sensor. This device operates in aggressive conditions of constant vibration and high temperatures, so its service life is not endless. Understanding the operating principles and symptoms of a malfunction will help you save time and money on diagnostics.
Operating principle and design features of DPKV on Murano Z50
The operation of the device is based on the electromagnetic principle. The sensor reads the teeth of a special disk mounted on the crankshaft pulley and converts mechanical movement into an electrical impulse. For Nissan Murano Z50 This is a critical element because the engine control system (ECU) uses this data to calculate ignition timing and injection timing. If the signal disappears, the control unit goes into emergency mode or completely blocks the start.
Structurally DPKV It is an inductor with a magnetic core, enclosed in a plastic housing. It is installed in close proximity to the crankshaft damper pulley, usually at the bottom of the engine, on the radiator side. The distance between the end of the sensor and the ring gear must be strictly regulated, since even a small gap affects the signal strength. Modern systems use an analog signal, which is then digitized by a computer.
It is important to note that on the engine VQ35DE a two-channel synchronization system is used, where the DPKV works in tandem with a camshaft position sensor (CPR). However, it is the crankshaft sensor that is the main one for determining engine speed. If it fails, the system loses the “main stroke” of the motor. Without this signal, the injectors will not receive the injection command, and the ignition coils will not receive the spark command.
- 🔍 The sensor works on the principle of inductance, responding to changes in the magnetic field.
- ⚙️ Located at the bottom of the engine, closest to the damper pulley.
- 🚫 If there is no signal, the engine stalls immediately after starting or does not start at all.
⚠️ Attention: By car Nissan Murano Z50 Often there is a problem with oxidation of contacts in the sensor connector due to moisture and road reagents. This can cause symptoms identical to the failure of the device itself.
Typical malfunction symptoms and error codes
Recognize a breakdown crankshaft sensor possible by a number of characteristic signs that appear suddenly. The most obvious symptom is that the engine starts, runs for a couple of seconds and then stalls. This happens because when the starter rotates, the sensor still produces a signal, but as soon as the engine goes into independent operation mode, the signal is lost due to unstable operation of the element itself or an open circuit. It is also possible that there is a complete lack of response to turning the key in the ignition switch.
Another common symptom is floating idle speed and jerking during acceleration. If the sensor begins to “sin” only when heated, then the problem may be in the thermal stability of the coil winding. When cold, the resistance is normal, but when warmed up, a break inside the coil makes itself felt. In this case, the car may drive normally when cold, but stall when hot. This is a classic problem with many Japanese cars of the period.
The light on the dashboard will come on. CHECK ENGINE. For accurate diagnostics, it is necessary to read error codes through an OBDII scanner. The most common codes for Nissan - these are P0335 (open circuit of the crankshaft position sensor) and P0336 (incorrect sensor signal). Sometimes additional codes associated with misfires (P0300-P0306) may occur, since the ECU cannot synchronize the operation of the cylinders without the DPKV signal.
- 🔴 Instant engine stop immediately after starting.
- 🔧 The Check Engine light is constantly on or flashes when under load.
- 🌡️ Problems with starting only on a warm engine.
- Engine won't start
- The car stalls while driving
- The revolutions are floating
- Check Engine Error Is Constantly On
Diagnostic and testing methods with a multimeter
Before you run to the store for a new spare part, you should make sure that the problem is in the sensor, and not in the wiring or connector. Diagnosis begins with a visual examination. It is necessary to remove the engine protection and find the sensor itself, located below. Check the integrity of the housing, the absence of mechanical damage and the reliability of the connector. It often happens that the wire simply rubs against a pulley or motor housing.
For electrical testing, you will need a multimeter. First check the coil winding resistance. Connect the probes of the device to the sensor contacts (usually there are two terminals). Normal resistance for Nissan Murano Z50 varies in the range from 500 to 1500 Ohms (the exact value depends on the batch and temperature). If the device shows “infinity” or zero, the sensor is faulty. It is also worth checking for a short circuit between the contacts and the sensor body (ground).
It is important to check the voltage at the connector with the ignition on. One of the wires should supply a signal from the ECU, and the second should be a signal wire. If there is no power at the connector or there is no signal, the problem may be in the wiring or the control unit itself. Use the wiring diagram for your year to determine the exact pin assignment. Never try to test the circuit with the ignition on, so as not to burn the ECU.
☑️ Sensor diagnostics
The process of replacing the crankshaft position sensor
Replacement DPKV on Nissan Murano Z50 - a task of medium complexity. You will need a lift or pit as the sensor is accessed from underneath the vehicle. You will need a standard set of wrenches, a 10mm socket (usually a single bolt on the sensor) and a new sensor. Before starting work, be sure to disconnect the negative terminal of the battery to avoid a short circuit.
The process begins with dismantling the plastic crankcase protection. Next, disconnect the electrical connector from the sensor by pressing the latch. Unscrew the mounting bolt and carefully remove the old sensor. Be careful: the housing may be stuck, so do not use excessive force to avoid damaging the seat. Inspect the O-ring on the old sensor and make sure that the new one is also present and in working order.
Installing a new crankshaft sensor happens in reverse order. Insert it into the seat and tighten the bolt to the torque recommended by the manufacturer (usually about 10 Nm). Do not overtighten the bolt as the sensor housing is plastic and may crack. Connect the connector until you hear a characteristic click. After installation, be sure to clear the errors with a scanner and check the engine operation. Start the engine and make sure it runs smoothly and does not stall.
Do I need to train the sensor?
On most VQ35DE engines, crankshaft sensor training is not required after replacement. The ECU automatically picks up the signal. However, if the error does not clear, it is recommended to carry out the initialization procedure through the diagnostic scanner.
⚠️ Attention: When replacing, be sure to use the original O-ring or its high-quality equivalent. If the ring is out of shape, the sensor may become unstable due to changes in clearance to the ring gear.
Selection of spare parts: original or analogue?
There is a huge selection on the auto parts market. crankshaft sensors. Official original part number for Nissan Murano Z50 (VQ35DE engine) - 23731-EN01A or 23731-EN00A. The original sensor guarantees accurate signals and a long service life, but its price can be quite high. Many owners are looking for more affordable options, and here it is important not to make a mistake with the choice of manufacturer.
Among analogues, brands have proven themselves well NTK And Denso, who are often suppliers to the conveyor belt. These sensors show excellent results in signal accuracy and temperature resistance. However, there are many counterfeits of these brands on the market, so it is better to buy spare parts from trusted suppliers. Cheap Chinese analogues often have unstable resistance characteristics and can fail after just a couple of months of operation.
When choosing, pay attention to the markings and quality of the plastic of the case. Counterfeits often have rough casting seams, and the connector may not fit well to the sensor. Also pay attention to the length of the wire and the shape of the connector - they must match the original. If you are not sure about the choice, it is better to consult with a specialist or order the part according to the vehicle’s VIN code to eliminate any discrepancies.
| Part type | Approximate resource | Benefits | Disadvantages |
|---|---|---|---|
| Original (Nissan) | 150,000+ km | Perfect compatibility, quality guarantee | High price |
| Original analogue (NTK/Denso) | 100,000+ km | Excellent quality, price lower than the original | Risk of counterfeiting |
| Budget analogue | 30,000 - 50,000 km | Low cost | Unstable operation, frequent failures |
Before purchasing a new sensor, be sure to check the condition of the crankshaft pulley. If the teeth on the damper pulley are damaged or contaminated with oil, even a new sensor will produce erroneous signals.
Frequent mistakes during diagnostics and repairs
One of the most common mistakes is replacing the sensor prematurely without checking the wiring. Owners Nissan Murano Z50 often they change a part several times in a row, not realizing that the problem is a broken wire in the harness. Wires can rub against the motor housing or pulley, especially in the bend area. Be sure to check the integrity of the insulation and test the circuit from the sensor connector to the ECU connector.
Another mistake is ignoring cleanliness. The sensor operates in conditions of constant contamination with oil and dirt. If metal shavings or an oil film has accumulated on the end of the sensor or on the pulley teeth, this may distort the signal. Before installing a new sensor, thoroughly clean the seat and the crankshaft pulley itself. Use degreaser and rags to remove any dirt.
It is also worth noting the error associated with incorrectly setting the gap. On some models, the sensor has a fixed position, but if the O-ring is installed crooked or damaged, the gap may change. This will result in the signal being too weak or, conversely, too strong. The correct clearance is the key to stable engine operation, so do not neglect to use a new O-ring when replacing.
- ⚠️ Do not change the sensor without checking the wiring and connector.
- 🧹 Clean the installation site from oil and dirt before installation.
- 🔩 Check the tightening of the fastening bolt - overtightening is dangerous for the body.
⚠️ Warning: Do not try to “fix” an old sensor by re-soldering the contacts or cleaning the coil. This is a temporary solution and does not guarantee stable operation of the engine control system.
Prevention and care of the ignition system
To extend life crankshaft sensor and the entire synchronization system, simple operating rules must be followed. Regularly changing your engine oil and using quality lubricants will help prevent oil from getting into electrical connectors. It is also recommended to periodically inspect the engine wiring for mechanical damage, especially after off-road driving.
It is important to monitor the condition of the spark plugs and coils. Misfires can create noise that the ECU may interpret as a faulty crankshaft sensor. Timely replacement of spark plugs and checking the coils will help avoid false alarms of the system. If you feel that the engine has begun to operate unstably, do not delay diagnosis - ignoring the problem can lead to serious consequences.
Use quality fuel. Impurities in gasoline can cause detonation, which increases engine vibration. Excessive vibrations accelerate wear on the sensor and can lead to destruction of its internal components. High-quality fuel and regular maintenance are the best prevention of problems with the ignition and timing systems.
Regular wiring diagnostics and cleanliness in the engine compartment are the main factors for the long service life of the crankshaft sensor on the Nissan Murano Z50.
Questions and answers (FAQ)
Is it possible to drive with a faulty crankshaft sensor?
No, it is impossible to drive with a faulty crankshaft sensor. The engine will either not start or will stall immediately after starting. In some cases, if the sensor is unstable, the engine may run, but with serious interruptions, which is dangerous when driving on the highway.
How much does it cost to replace a crankshaft sensor on a Nissan Murano Z50?
The cost of the spare part itself varies from 2000 to 6000 rubles, depending on the manufacturer (original or analogue). The cost of service work ranges from 1,500 to 3,000 rubles, since access to the sensor is from below the car.
Can the crankshaft sensor affect fuel consumption?
Yes, a faulty sensor can cause the engine management system to malfunction, causing the mixture to become rich or lean. This significantly increases fuel consumption and reduces vehicle dynamics.
How often should the crankshaft sensor be replaced?
There is no official replacement regulation. The sensor is considered a resource part and is replaced as it fails. Under normal operating conditions, it can last more than 100,000 km, but in practice it often fails earlier due to vibrations and temperature changes.