Engine start at Nissan Primera P12 can suddenly turn into a real headache if the Check Engine light comes on on your dashboard. Drivers often encounter an error code P0335, which indicates a faulty crankshaft position sensor circuit. Without a signal from this element, the electronic control unit ECU it just doesn’t know at what point to supply the spark and fuel, which is why the engine stops starting.
Ignoring this problem leads to a complete stop of the vehicle at the most inopportune moment. On Nissan Primera With engines of the QR or SR series, this malfunction occurs quite often due to the design features of the ignition system. It is important to understand that the problem may lie not only in the sensor itself, but also in the wiring, or even in mechanical damage to the flywheel ring gear.
The essence of the problem and the principle of operation of the sensor
Crankshaft position sensor, or DPKV, is a critical component of the engine management system. Its task is to monitor the speed of rotation of the shaft and its exact position at each moment in time. The ECU uses this data to synchronize the operation of the injectors and the ignition system. If the signal is missing or distorted, the control unit goes into emergency mode or completely blocks the start.
On Nissan Primera P12 This sensor is usually installed in the cylinder block area, close to the crankshaft pulley. It works on the inductive principle, generating alternating current when the teeth of a special reflector disk pass past the sensitive element. Any violation in this chain leads to the appearance of a code P0335 in error memory.
Symptoms can manifest themselves in different ways: from unstable idling to complete inability to start the car. Sometimes the engine may start and stall after a few seconds because the signal disappears when it warms up. In other cases, the car is simply silent when you turn the key, showing no signs of life.
The main causes of error P0335
The causes of failure are divided into electrical and mechanical. Most often, the culprit is the sensor itself, whose sensitive element fails due to overheating or vibration. However, on Nissan A common problem is broken contacts in the connector or oxidation of the wires going to the control unit.
Sometimes the problem lies in the wiring. The long route from the sensor to the ECU passes through areas with high temperature and vibration. The insulation may fray, causing a short to ground or an open circuit. It is also worth checking the integrity grounding the sensor itself, since poor ground contact distorts the signal.
Mechanical damage should also not be discounted. If the teeth on the crankshaft damper pulley are broken or have excessive play, the sensor will not be able to read the position correctly. In rare cases, the cause is a displacement of the timing marks, which changes the rotation phases and disrupts synchronization.
- 🔥 Overheating and failure of the internal winding of the sensor
- 🔌 Oxidation of contacts in the electrical connector
- ⚡ Open or short circuit in the wiring harness
- 🛠️ Damage to the crankshaft ring gear or damper
Circuit Diagnostics and Sensor Test
For accurate diagnostics, you need a multimeter and, preferably, an oscilloscope. Start by visually inspecting the sensor connector. It must be dry, clean, free of oil or corrosion. If the connector is oxidized, it must be cleaned and treated with contact lubricant.
Then ring the sensor itself. Disconnect the connector and measure the resistance between the contacts. For most models Nissan normal resistance ranges from 500 to 1500 ohms. If the device shows infinity or zero, the sensor must be replaced immediately.
It is important to check the supply voltage if the sensor is active (although Primera often has passive ones). When the ignition is turned on, a voltage of about 5 or 12 volts should be present at the corresponding contacts of the connector, depending on the circuit. No power will indicate a problem with the ECU circuit or fuse.
- The car won't start at all
- The engine starts and stalls
- Unstable idle speed
- Problems only after warming up
Step-by-step instructions for replacement and setup
Replacing the sensor with Nissan Primera P12 - the procedure is not the most complicated, but it requires care. You will need a set of wrenches, a new sensor and possibly a jack for access from below. First you need to remove the negative terminal from the battery to avoid a short circuit.
The sensor is accessible from below the vehicle. On SR series engines it is located closer to the gearbox, on QR - in the pulley area. Unscrew the mounting bolt, disconnect the connector and carefully remove the old element. Install the new sensor, observing the gap if it is adjustable, and tighten the bolt.
After installation, be sure to clear the error using a diagnostic scanner or by disconnecting the battery. If the error does not disappear immediately, check the quality of the connection. Sometimes ECU adaptation is required, although on most Nissan this happens automatically the first time you start it.
☑️ Check before replacement
⚠️ Attention: Make sure the new sensor has the correct stem length. Improper clearance between the sensor and the ring gear can cause it to bang against the ring when the engine is running, causing mechanical failure.
The influence of wiring quality on system operation
Wiring is a weak point in many Nissan vehicles. In the harness going to the sensor, the wires may rub against the body or engine elements. This creates spurious signals that the ECU interprets as an error. P0335. This is especially true for cars with a mileage of more than 150,000 km.
It is recommended to test each wire from the sensor connector to the ECU connector. Look for hot spots where the insulation may have melted. If the wire is damaged, it must be replaced with one of a similar cross-section and insulation quality. Do not use simple twists without heat shrink.
Often the problem is the "ground". If the sensor's ground point has oxidized or become loose, the signal will be unstable. Locate the ground mounting location on the engine, strip it down to bare metal and tighten securely. This simple step often solves the problem without replacing expensive parts.
What should I do if the error returns immediately after a reset?
If the P0335 error appears again immediately after cleaning, this indicates that the problem is not in the sensor itself, but in the power circuit, a broken wire, or a faulty ECU. It is necessary to carefully check the integrity of the harness and the presence of voltage at the contacts with the engine running.
Specifics of QR20 and QR25 engines on Primera
Series engines QR, installed on Primera P12 have their own characteristics. The crankshaft position sensor is located here so that it is exposed to splashes of oil and dirt, which accelerates its wear. In addition, on these motors there is often a problem with the damper pulley, which over time dries out and becomes loose.
When diagnosing QR20DE and QR25DE, be sure to check the condition of the timing belt. If the marks are off by even one tooth, this can cause timing errors, which the ECU can interpret as a problem with the crankshaft sensor. A visual inspection of the teeth on the crankshaft pulley is mandatory.
It is also worth noting that on these motors the sensor often fails after the engine overheats. If you have previously experienced overheating, replacing the sensor is the first thing to do when the error occurs. However, do not forget to check the wiring, as high temperature could damage the insulation in the harness.
| Parameter | Norm | Deviation | Action |
|---|---|---|---|
| Sensor resistance | 500–1500 Ohm | Infinity / 0 Ohm | Replacing the sensor |
| Supply voltage | 5–12 V | 0 V | Checking the ECU circuit |
| Zer to the pulley | 0.5–1.0 mm | More than 1.5 mm | Sensor replacement/gasket |
| Connector status | Clean, dry | Oxidation, oil | Cleaning or replacement |
Professional diagnostic methods
If standard diagnostics do not produce results, professional equipment will be required. An oscilloscope will allow you to see the waveform in real time. Even if the sensor resistance is normal, the waveform may be distorted due to internal defects.
On Nissan Primera P12 is often helped by checking the signal at idle. Connect an oscilloscope to the signal wire and crank the engine with the starter. You should see smooth sine waves. If the waves are interrupted or have dips, the problem is in the pulley teeth or mechanical play.
Sometimes the problem lies in the control unit itself. If there is moisture or oxidation on the ECU connector, it may cause signal loss. In such cases, it is necessary to disassemble and clean the ECU board, or replace the unit with a known good one.
Before purchasing a new sensor, be sure to compare it with the original one in terms of markings and appearance. Cheap analogues may have incorrect clearance, which will lead to rapid failure and repeated error P0335.
Results and recommendations for prevention
Error P0335 on Nissan Primera P12 is a serious signal that requires immediate attention. Ignoring the problem may result in the car remaining inoperable while away from home. Regularly checking the condition of the sensor and wiring will help avoid sudden breakdowns.
Remember that quality diagnostics saves money. Replacing the sensor without checking the wiring often does not solve the problem, and the error returns after a while. Always check the continuity of the circuit and the condition of the contacts before installing new parts.
Regularly checking the condition of the crankshaft sensor connector and clearance is the best prevention of error P0335 on Nissan Primera P12.
⚠️ Attention: Never try to start an engine with a faulty crankshaft position sensor, as this may damage the ECU due to constant timing attempts and incorrect injector operation.
Frequently Asked Questions
Is it possible to drive a Nissan Primera with P0335?
No, you can't drive. The engine will either not start or will operate extremely unstable, which can lead to a stop in traffic. Additionally, repeated attempts to start can damage the starter and battery.
Can P0335 be caused by bad gasoline?
Indirectly - yes. Bad fuel can lead to detonation, which causes severe engine vibration. These vibrations can loosen the sensor or damage fragile wiring, resulting in signal failure.
How much does it cost to replace a crankshaft sensor?
The cost of the sensor itself varies from 1,500 to 5,000 rubles, depending on the brand. The replacement job usually takes 30-60 minutes and is inexpensive if the sensor is easily accessible.
Do I need to reset the error after replacing it?
Yes, definitely. The error may remain in the computer's memory and the Check Engine light may continue to light even after the problem has been eliminated. The reset can be done through a diagnostic scanner or by disconnecting the battery for 10-15 minutes.
Which sensor is better to install: original or analogue?
It is recommended to install an original Nissan sensor or high-quality analogues from well-known brands (for example, Denso). Cheap Chinese copies often have unstable characteristics and quickly fail.