<em>Nissan Almera N16</em> crankshaft sensor: how to recognize a fault and replace it yourself

Nissan Almera N16 is a popular sedan known for its reliability, but even it has its weaknesses. One of them is Crankshaft position sensor (CPS), whose malfunction can immobilize the car at the most inopportune moment. This small sensor is responsible for synchronizing the operation of the fuel system and ignition, and its failure is often disguised as other problems: from bad gasoline to faulty spark plugs.

In this article we will look at how diagnose DPKV failure on Almera N16 (including versions with engines QG15DE And QG18DE), which error codes indicate a problem, and whether it is possible to do without a service visit. And also - detailed replacement instructions with photos, choosing an original sensor and life hacks that will save time and money.

What is a crankshaft sensor and how does it work? Almera N16

Crankshaft position sensor (CPKV, aka crankshaft position sensor) is inductive or Hall sensor, which reads pulses from the toothed disk on the crankshaft. On Almera N16 is used exactly inductive type: It generates alternating current when metal teeth pass past its core. These pulses are converted into a signal for ECU (electronic control unit), which calculates based on them:

• 🔹 Fuel injection timing — when to open the injectors.
• 🔹 Ignition timing — when to apply a spark to the spark plugs.
• 🔹 Engine speed - to adjust the operation of systems.

On Almera N16 The sensor is located next to the flywheel, on the gearbox housing (battery side). He is easily identified by two-pin connector and fastening with one bolt. A special feature of the model is its sensitivity to dirt and mechanical damage: even a small crack in the case or metal shavings on the magnet can distort the signal.

If the DPKV fails, ECU loses synchronization and goes into emergency mode - or completely blocks the engine from starting. And on Almera N16 this happens often sporadically: the car may start “every time” or stall while driving, which complicates diagnostics.

Signs of a malfunction of the DPKV on Nissan Almera N16

Symptoms of a broken crankshaft sensor often coincide with malfunctions of other systems, so it is important to pay attention to complex of signs. Here are typical "calls" for Almera N16:

• 🚗 Engine won't start or it starts after 3–5 attempts (the starter turns, but there is no flash in the cylinders).
• ⚡ "Floating" speed at idle speed (tachometer needle twitches in the range of 500–1500 rpm).
• 💥 Detonation during acceleration — knocking in the engine, loss of power.
• 🔴 Check Engine lights up and goes out randomly (especially after driving through puddles or washing).
• 🛑 The car stalls while driving, then starts only after 10-15 minutes.

On Almera N16 with engine QG18DE faulty DPKV often appears misfires in cylinders 1–4 (code P0300–P0304). And on the version with QG15DE more common complete startup failure without preliminary symptoms.

Key feature: if the problem is in DPKV, then the error may not be recorded in the ECU memory! This is due to the fact that if there is no signal from the sensor, the control unit simply “does not see” the crankshaft and does not record the code. Therefore, diagnostics must be carried out at the moment of failure.

⚠️ Attention: If after washing the engine or heavy rain the car stops starting, in 70% of cases the DPKV is to blame. Water enters the connector or sensor contacts, causing a short circuit. Before replacing, try drying the sensor with a hairdryer (without overheating!) and clean the contacts.

Error codes associated with DPKV on Almera N16

When scanning Nissan Almera N16 diagnostic scanner (for example, ELM327 or Launch CReader) a malfunction of the crankshaft sensor can be manifested by the following codes:

Error code	Description	Probable Cause	Urgency
P0335	Crankshaft position sensor circuit malfunction	Broken wiring, oxidation of contacts, failure of DPKV	⭐⭐⭐⭐⭐
P0336	DPKV signal range/performance	Mechanical damage to the sensor, metal shavings on the magnet	⭐⭐⭐⭐
P0340	Malfunction of the camshaft sensor circuit (may be false if there are problems with the camshaft sensor)	Synchronization is disrupted due to an incorrect signal from the crankshaft	⭐⭐⭐
P0300	Multiple misfires	The computer cannot correctly calculate the injection timing due to a failure of the DPKV	⭐⭐⭐⭐

Important: code P0340 (camshaft sensor) on Almera N16 often appears along with DPKV errors. This is due to the fact that the ECU uses the signals from both sensors to synchronize the valve timing. If the crankshaft is silent, the control unit may mistakenly “think” that the problem is in the camshaft.

How to check if DPKV is to blame?

1. Count errors by the scanner (if any).
2. Reset the errors and see if they appear again.
3. Check oscilloscope signal shape (ideally amplitude 0.5–1.5 V, frequency depends on revolutions).
4. Measure sensor resistance multimeter (standard for Almera N16: 500–700 Ohm).

How to check the crankshaft sensor for Almera N16 without scanner

Not everyone has a diagnostic scanner, but that's not a problem. Check DPKV for Nissan Almera N16 possible using multimeter or even visually. Here are the step-by-step instructions:

1. Visual inspection

• 🔍 Check it out sensor housing for cracks or chips (especially near the connector).
• 🧲 Inspect the end of the sensor - there should not be any metal shavings or dirt.
• 🔌 Make sure that the connector fits tightly and there is no oxidation (green coating) on the contacts.

2. Resistance check

Switch the multimeter to resistance measurement mode (2000 Ohms) and connect the probes to the sensor terminals. Norm for Almera N16:

• 📊 500–700 Ohm - the sensor is OK.
• 🚫 0 ohm - short circuit (replacement required).
• 🚫 ∞ (infinity) - winding break.

3. Inductance test (optional)

If there is megohmmeter, measure the inductance of the winding - it should be within 200–400 mH. Also check insulation resistance (between the housing and the terminals): at a voltage of 500 V it must be at least 20 MOhm.

4. Checking the power circuit

Disconnect the DPKV connector and check:

• 🔋 Availability +12 V on one of the contacts (with the ignition on).
• 🔌 "Mass" on the second contact (resistance to the body should be close to 0 Ohm).

⚠️ Attention: On Almera N16 with automatic transmission, if the DPKV circuit is broken, it may gear selector locked in position "P". This is protection against accidental movement when the engine is not running. If the car does not start and does not change gears, first check the DPKV!

Step-by-step instructions for replacing the crankshaft sensor with Almera N16

Replacing DPKV with Nissan Almera N16 takes no more than 30 minutes and does not require special tools. You will need:

• 🔧 Key on 10 mm (or head with extension).
• 🧴 WD-40 or similar penetrating lubricant (if the bolt is stuck).
• 🧤 Clean gloves (so as not to contaminate the new sensor).
• 📏 Probe 0.5–1 mm to check the gap.

Sequence of actions:

1. Disconnect the battery (remove the negative terminal) to avoid short circuit.

2. Disconnect sensor connector — press the latch and pull it up.

3. Unscrew fastening bolt 10mm wrench. If it does not give in, treat it WD-40 and wait 5-10 minutes.

4. Carefully remove the sensor. Please note o-ring - if it remains in the nest, remove it.

5. Clean the seat from dirt and metal shavings (you can use carbcleaner).

6. Install new sensor, making sure the O-ring is in place. Tighten the bolt firmly 8–10 Nm (do not overtighten!).

7. Connect the connector and check gap between sensor end and flywheel - he must be 0.5–1.5 mm.

8. Connect the battery and start the engine. If errors remain, reset them with a scanner or by disconnecting the terminal for 10 minutes.

Important nuance: on Almera N16 after replacing the DPKV it may be necessary throttle adaptation (if the ECU has reset). To do this:

1. Turn on the ignition for 5 seconds (without starting the engine).
2. Turn off the ignition for 10 seconds.
3. Start the engine and let it idle for 2-3 minutes.

What to do if after replacing the DPKV the car still does not start?

If the engine does not start even with a new sensor, check:

1. **Connection polarity** - on Almera N16 The DPKV connector has a key, but sometimes it is bypassed during makeshift repairs.

2. **Wiring integrity** - check the wires from the sensor to the ECU (they often fray near the exhaust manifold).

3. **Condition of the toothed disk** on the crankshaft - if the teeth are chipped, the signal will be incorrect.

4. **Supply voltage** - must be 12 V on one of the connector contacts.

Which crankshaft sensor to choose for Almera N16: original vs analogues

Original crankshaft sensor for Nissan Almera N16 has an article number 23731-4M000 or 23731-4M005 (depending on the year of manufacture). Its average price is 2500–3500 rubles. But there are also high-quality analogues on the market:

Manufacturer	Article	Price, rub.	Features
Nissan (original)	23731-4M000	2500–3500	1 year warranty, perfect compatibility
Bosch	0 261 210 115	1800–2200	High quality, fits most Japanese cars
ERA	550447	1200–1500	Budget option, but there are frequent cases of defects
Blue Print	ADG02303	1600–1900	Good price/quality ratio

What is important to know when choosing:

• 🔍 Check the packaging - original sensor Nissan has a hologram and serial number.
• 🧲 Magnetic core should attract metal objects (if not, the sensor is defective).
• 📏 Length and diameter must match the original (sometimes analogues have different dimensions).

Advice: if you buy a non-original sensor, take it with you old — in the store you can compare their weight. The original weighs approx. 120–140 grams, and cheap fakes are often lighter due to savings on copper in the winding.

Common mistakes when replacing DPKV and how to avoid them

Even experienced car owners sometimes make mistakes that lead to repeated breakdowns. Here TOP 5 misses when replacing the crankshaft sensor with Almera N16:

• 🔧 Tightening the fastening bolt → a crack in the sensor body or thread failure in the block.
• 🧴 Ignoring the O-ring → oil and dirt getting on the contacts.
• 🔌 Incorrect connector connection → reverse or poor contact.
• 🧲 Installing the sensor without cleaning the seat → metal shavings are attracted to the magnet and distort the signal.
• 📏 Failure to maintain clearance → if the sensor is recessed or protrudes, the signal will be weak.

How to avoid problems:

1. Use torque wrench for tightening the bolt (torque 8–10 Nm).
2. Before installing a new sensor blow out the seat with compressed air.
3. Check wiring integrity - often a break occurs near the connector.
4. After replacement reset errors scanner or disconnecting the battery.

⚠️ Attention: On Almera N16 with engine QG18DE after replacing the DPKV it may be necessary reset ECU adaptations. If the speed “floats” after starting, perform the idle speed learning procedure (instructions are in the service manual).

FAQ: Frequently asked questions about the crankshaft sensor on Almera N16

Is it possible to drive with a faulty DPKV?

No. If the sensor fails completely, the engine won't start. If it works intermittently, misfires are possible, which leads to catalyst overheating and increased fuel consumption. Driving for a long time with a faulty DPKV can damage it. ignition coils And injectors.

What clearance should there be between the DPKV and the flywheel?

Optimal clearance for Almera N16 — 0.5–1.5 mm. If the gap is larger, the signal will be weak; if less, the sensor may touch the flywheel. You can check the gap feeler gauge or a caliper.

Why did error P0335 remain after replacing the DPKV?

Possible reasons:

• 🔌 Poor contact in the connector (oxidation or wire breakage).
• 🔧 Malfunction toothed disc on the crankshaft (teeth chipped).
• 🖥️ Problems with ECU (diagnostics required).
• 🔋 Low voltage in the on-board network (less than 11.5 V).

Check signal oscillogram - if the amplitude is less than 0.3 V, the problem is not with the sensor.

Is it possible to clean the DPKV instead of replacing it?

Yes, but only if the problem is pollution. Clean the end of the sensor and the mounting socket from metal shavings and oil using:

• 🧴 Carbcleaner (leaves no traces).
• 🧹 Soft brush (for example, a toothbrush).
• 🧲 Magnet - to remove metal particles.

If the problem remains after cleaning, the sensor must be replaced.

Where to buy original DPKV for Almera N16 inexpensively?

Original sensor 23731-4M000 can be found:

• 🛒 Official Nissan dealers - expensive, but 1-2 year warranty.
• 🌍 Online stores (Exist.ru, Autodoc, Emex) - often there are discounts up to 30%.
• 🔄 Used markets (Avito, Drom) - risk of running into a faulty sensor.
• 🏗️ Showdown - 2-3 times cheaper than the original, but without a guarantee.

Tip: check the sensor when purchasing multimeter on site (resistance 500–700 Ohm).