Internal combustion engine Nissan Sunny FB15 requires the owner to pay close attention to the ignition system and fuel supply control. One critical element here is the crankshaft position sensor. If this element fails, the car will no longer start because the electronic control unit loses synchronization with the movement of the pistons.
Many owners are faced with a situation where the car stalls while driving or does not respond to turning the ignition key. In such cases, it is often the fault DPKV (crankshaft position sensor). Replacing this part on a model with an HR or MR series engine is a procedure that you can perform yourself if you know the nuances of access and the sequence of actions.
Ignoring a sensor malfunction can lead to a complete failure of the power unit along the way, which is especially dangerous when driving on the highway. Synchronization The operation of the injectors and ignition system completely depends on the signal coming from this device. Therefore, timely diagnosis and replacement is the key to reliable operation of your Nissan Sunny.
Symptoms of malfunction and causes of failure
Problems with the crankshaft sensor can be recognized by a number of specific signs that manifest themselves in the behavior of the car. Most often, the driver notices that the engine starts with difficulty, and sometimes it does not start at all, although the starter turns properly. This occurs due to the lack of signal about the position of the pistons.
Other warning signs include sudden loss of power while driving, floating idle speed, and detonation. The electronic control unit tries to compensate for the lack of data by operating in emergency mode, which causes unstable operation of the motor. Sometimes the icon on the dashboard lights up Check Engine.
The reasons for the breakdown can be very different. The main factor is natural wear of the magnetic core or breakage of the internal winding. The performance is also affected by overheating, vibration and the ingress of technical fluids onto the sensor body.
It is important to note that often the problem lies not in the device itself, but in its connector or wiring. Oxidation of the contacts or damage to the wire insulation can simulate a sensor failure. Therefore, before purchasing a new part, you must carefully check the electrical circuit.
Preparation of tools and selection of spare parts
For a successful replacement, you will need a minimum set of tools, which most car enthusiasts have. You don't need fancy equipment, but having quality keys will make the task much easier. The main tool will be a socket wrench or a 10 mm socket for unscrewing the fastening bolt.
In addition to the keys, prepare a flat-head screwdriver to carefully disconnect the connector and a rag to clean the work area. If the sensor is difficult to access, a ratchet extension may be needed. Also don't forget a new sensor and possibly sealant if required by specification.
When choosing a spare part, it is critical to pay attention to the article number and manufacturer. Original from Nissan guarantees durability, but there are high-quality analogues from brands like Bosch or Denso. Don't skimp on this part, as cheap knockoffs often have incorrect clearance or a weak magnetic field.
Original catalog number for most HR series engines on Nissan Sunny FB15 usually begins with the prefix 23731. Before purchasing, be sure to check the number on the old sensor housing with the number on the new part, as engine modifications may differ.
- HR12DE
- HR15DE
- MR18DE
- Other
Sensor localization and access features
On series engines HR, installed on Sunny FB15, the crankshaft sensor is located at the bottom of the engine, on the gearbox side. This place is considered not the most convenient for maintenance, since access to it is often blocked by elements of the subframe or exhaust system.
You will have to crawl under the car or lift it up to see the installation area. The sensor is attached to the clutch housing or cylinder block in close proximity to the flywheel. This is where the toothed disk is located, along which the pulses are read.
Sometimes, for comfortable access, you need to remove the engine guard or unscrew a few subframe bolts to create room for your hands. This depends on the specific configuration and year of manufacture of the car. Be prepared that work may take longer due to cramped conditions.
Attention: Before climbing under the car, make sure it is stable. Using a jack without safety stops is strictly prohibited, as you will be working with tools in an awkward position.
β οΈ Attention: Before starting work, be sure to disconnect the negative terminal of the battery. This will eliminate the risk of a short circuit if the wiring is accidentally touched.
Step-by-step replacement instructions
The replacement process begins with de-energizing the vehicle and preparing the workplace. Find the sensor, clean its housing from dirt and oil so that it does not fall onto the engine when dismantling. Then carefully disconnect the electrical connector by pressing the latch.
You need to unscrew one mounting bolt that holds the sensor. Use a 10mm socket, being careful not to strip the threads. Once the bolt is removed, the sensor can be removed. Sometimes it sits tightly, so you can wiggle it slightly, but not too much, so as not to damage the wiring.
Inspect the seat on the engine block. If there are traces of oil or metal, clean it thoroughly. Install the new sensor, lightly lubricating the O-ring with engine oil for ease of installation. Tighten the fastening bolt with the correct torque (usually about 10 Nm), but do not overdo it.
Connect the electrical connector until you hear a characteristic click. This guarantees reliable contact. After assembly, be sure to check that the wire does not touch hot engine parts or moving parts.
βοΈ Check before launch
It is important not to forget about setting the gap if the design of the sensor implies this, although on most modern models it is adjusted itself during installation. If you have access to a diagnostic scanner, you can reset engine management system errors.
Start the car and listen to the engine. It should run smoothly without misfiring. If the car starts on the first try and the idle speed is stable, then the job was completed successfully. Do a test drive to ensure there are no problems under load.