Phase (camshaft) sensor on Nissan Almera Classic: diagnostics and repair

Nissan Almera Classic (also known as N16 in the B10 body) is one of the most popular sedans on the secondary market due to its reliability and ease of maintenance. However, even such time-tested cars have weaknesses. One of them is Camshaft position sensor (CPR), whose malfunction can lead to floating speed, loss of power and even engine failure to start. In this article we will look at how to independently diagnose the problem, select a spare part and replace the sensor without contacting service.

Feature Almera Classic with engines QG15DE And QG18DE The point is that the camshaft sensor here plays a key role in the ignition control system. Its signal synchronizes the operation of injectors and ignition coils with the valve timing. If the sensor fails, the ECU goes into emergency mode, which can lead to increased fuel consumption by 15–20% and the risk of catalyst damage due to incorrect fuel mixture. At the same time, many owners confuse the symptoms of a DPRV malfunction with problems with the distributor or throttle valve.

Signs of a malfunctioning camshaft sensor on a Nissan Almera Classic

The first “bells” about problems with the DPRV are often ignored, since they are similar to malfunctions of other systems. However, there are specific symptoms that directly point to the sensor:

• 🔥 Engine stalls at idle or it works unstably (the speed “floats” in the range of 500–1000 rpm).
• ⚡ Check Engine light comes on with errors P0340 (“Camshaft position sensor circuit malfunction”) or P0345 (“Incorrect DPRV signal”).
• 🚗 Power drop when accelerating, especially at speeds above 3000, the car “stumbles” and does not pick up speed.
• 🔧 Difficulty starting the engine (the starter turns, but the engine does not “catch” or starts only after 2-3 attempts).
• 💨 Increased fuel consumption (1–2 liters more than usual) due to an over-enriched mixture.

It is important to distinguish a DPRV malfunction from problems with crankshaft sensor (DPKV). If the second one fails, the engine will not start at all, while if the camshaft sensor fails, the engine may work, but intermittently. Also on Almera Classic sometimes it crashes Idle air regulator (IAC), but in this case the errors in the ECU will be different (P0505 or P0507).

⚠️ Attention: If the dashboard lights up Check Engine, and the engine begins to “trouble”, do not rush to change spark plugs or coils. First check the camshaft sensor - its diagnosis takes 10 minutes and does not require special equipment.

Where is the camshaft sensor located on Nissan Almera Classic?

On Almera Classic with engines QG15DE And QG18DE The camshaft sensor is installed at the top of the cylinder head, next to first cylinder. Exact location:

• 📍 On the right in the direction of travel (if you look at the engine from the radiator side).
• 🔧 Under the valve cover, next to the intake camshaft.
• 🔌 Attaches with one bolt 10 mm and has a connector with 3 wires (signal, ground, power supply +5V).

To get to the sensor you will need:

1. Remove decorative plastic cover motor (held on by 4 latches).
2. Disconnect power connector from the sensor (press the latch and pull up).
3. Unscrew fastening bolt 10mm wrench.

On some modifications Almera Classic (for example, with an air conditioner), access to the sensor may be difficult due to pipes and wiring. In this case, you will have to temporarily remove intake manifold or remove disturbing elements to the side.

How to distinguish a camshaft sensor from a crankshaft sensor?

The camshaft sensor on Almera Classic has black or dark gray body with markings 23731-4M200 or similar. The crankshaft sensor is located below, on the cylinder block next to the flywheel, and has a metal body with a ring magnet.

How to check the camshaft sensor on a Nissan Almera Classic?

Diagnosis of DPRV can be done in three ways: visually, multimeter And via OBD-II scanner. Let's start with the simplest thing - inspecting the sensor.

1. Visual inspection

Remove the sensor and inspect it for:

• 🔍 Cracks or chips on the body (especially in the place where the connector is attached).
• 🧲 Contamination with metal shavings — it can block the signal.
• 💧 Traces of oil or antifreeze — liquid getting inside the sensor leads to a short circuit.

2. Check with a multimeter

To test, you will need a multimeter in resistance measurement mode (200 Ohm) and voltage (20 VDC). Procedure:

1. Disconnect the sensor connector and check resistance between pins 1 and 2 (usually these are signal and ground wires). Normal value: 550–750 Ohm.
2. Reconnect the connector and check voltage between pin 3 (power) and ground with the ignition on. Must be 4.5–5 V.
3. Crank the engine with the starter (without starting) and measure voltage between pins 1 and 2. It should vary in the range 0.3–4.5 V.

If the resistance approaches zero or infinity, and there is no voltage, the sensor is faulty. Also worth checking wiring integrity from the sensor to the ECU (contacts may oxidize or fray).

3. Diagnostics via OBD-II

Connect the scanner (for example, ELM327) to the connector OBD-II (located under the steering wheel) and count the errors. Codes associated with DPRV:

Error code	Description	Probable Cause
P0340	Camshaft sensor circuit malfunction	Wire break, contact oxidation, sensor malfunction
P0341	Signal mismatch between DPRV and DPKV	Timing belt misalignment, sensor damage
P0345	Incorrect sensor signal	Sensor contamination, magnetic core damaged
P0335	Crankshaft sensor circuit malfunction	The problem is not in the DPRV, but in the DPRV or its wiring

If the scanner shows an error P0340, but visually the sensor is intact, check connector condition — often oxidation of contacts leads to signal loss. Also make sure that The timing belt did not jump a tooth, otherwise the synchronization of the shafts will be disrupted.

Which camshaft sensor should I choose for Nissan Almera Classic?

Original sensor from Nissan has an article number 23731-4M200 (for engines QG15DE/QG18DE). Its average price is 2500–3500 rubles. However, there are high-quality analogues on the market that are cheaper:

Manufacturer	Article	Price, rub.	Notes
Nissan (original)	23731-4M200	2500–3500	1 year warranty, best quality
Denso	5503101	1800–2200	Japanese quality, compatible with Almera Classic
Bosch	0 261 210 115	1500–1900	German brand, suitable for QG series
ERA	550310	800–1200	Budget option, resource ~50 thousand km

When choosing an analogue, pay attention to:

• 🔧 Engine compatibility (indicated on the packaging).
• 🧲 Presence of a magnetic core — without it, the sensor will not read pulses.
• 📦 Complete set (the box should contain an O-ring and a mounting bolt).

⚠️ Attention: When buying a sensor from disassembly, check it with a multimeter - many “used” sensors are already worn out and will not last long. Also avoid cheap Chinese analogues without a brand - they often fail after 10-20 thousand km.

Step-by-step instructions for replacing the camshaft sensor

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

• 🔧 10 mm wrench (or ratchet head).
• 🔌 Flat blade screwdriver (for disconnecting the connector).
• 🧴 A rag and contact cleaner (for example, WD-40).

Sequence of actions:

1. Disable negative battery terminal (this will reset errors in the ECU).
2. Remove decorative engine cover (pull up on the latches).
3. Disconnect sensor connectorby pressing the latch.
4. Unscrew fastening bolt with a 10 mm wrench and remove the sensor.
5. Clear seat from dirt and oil.
6. Install new sensor (don't forget the O-ring!) and tighten the bolt to torque 8–10 Nm.
7. Connect the connector and replace the engine cover.
8. Connect the battery and start the engine. If Check Engine does not go out, reset the errors with the scanner.

After replacing the sensor, the engine may be unstable for the first 5–10 minutes - this is normal, since the ECU is “retrained” for the new signal. If after 10–15 km the error P0340 appeared again, check:

• 🔌 Quality of contact in the connector (possibly oxidation).
• 🔧 Bolt tightening — the sensor should fit tightly, without play.
• 🔄 Timing belt offset (if the marks are knocked down, the signal will be incorrect).

Common mistakes when replacing the camshaft sensor

Even experienced car owners sometimes make mistakes that lead to repeated breakdowns or new problems. That's what can't do when replacing DPRV with Almera Classic:

• 🚫 Use sensor without O-ring - this will lead to air leaks and unstable engine operation.
• 🚫 Tighten the fastening bolt with a force of more than 10 Nm - You can break the thread in the block head.
• 🚫 Connect the connector to the sensor before its final installation. — there is a risk of damaging the contacts.
• 🚫 Ignore DPKV errors — if the crankshaft sensor is faulty, replacing the DPRV will not solve the problem.

Another common mistake is buying a sensor without testing. For example, on Almera Classic with engine QG18DE sometimes sensors are installed from Nissan Primera (article 23731-4M205), which are identical in appearance but have a different resistance range. This results in an error P0345 and unstable engine operation.

Also not worth it reset ECU errors before replacing the sensor. If after resetting the engine starts and runs normally, this does not mean that the problem is solved - the error may appear again after a few kilometers. Always fix the cause first and then reset Check Engine.

Cost of service work vs. self-replacement

Camshaft sensor replacement cost Nissan Almera Classic in service depends on the region and level of the service station. On average the prices are:

Service	Cost, rub.	Notes
Diagnostics (read errors)	500–1000	No repairs, just checking
Replacing the camshaft sensor	1000–1500	Excluding cost of spare parts
Comprehensive diagnostics (checking DPRV, DPVKV, wiring)	1500–2500	Includes contact cleaning and signal testing

Replacing it yourself will only cost the cost of the sensor (800–3500 rub.), but will require time and minimal skills in working with the tool. If you are not confident in your abilities, it is better to contact the service - errors during replacement (for example, damage to the connector or incorrect installation) can result in more expensive repairs.

You can save money if:

• 🔧 Remove the old sensor yourself and take it to a service center to have it checked (many service stations charge less for on-the-table diagnostics).
• 🛒 Buy the sensor yourself (services often charge 20–30% on spare parts).
• 📱 Use mobile scanner (For example, ELM327 for 500 rub.) to reset errors after replacement.

FAQ: Frequently asked questions about the camshaft sensor on Nissan Almera Classic

Is it possible to drive with a faulty camshaft sensor?

Technically possible, but not recommended. In emergency mode, the ECU uses only the signal from the crankshaft sensor, which leads to:

• Increased fuel consumption (up to +20%).
• Loss of power (especially at rpm above 3000).
• Risk of catalyst damage due to incorrect fuel mixture.

If the sensor fails completely, the engine may suddenly stall while driving.

How to distinguish a faulty air pressure control valve from problems with the timing belt?

When jumped timing belt errors usually appear P0341 (“Inconsistency between DPRV and DPKV signals”) or P0016 (“Phase mismatch”). There may also be:

• Knock in the engine (if the belt has slipped a few teeth).
• Complete failure to start (if the belt breaks).

In case of malfunction DPRV the engine runs, but intermittently, and errors are usually P0340 or P0345.

Do I need to reset adaptations after replacing the sensor?

On Nissan Almera Classic There is no need to reset adaptations - the ECU will automatically “adjust” to the new sensor after 2-3 startup cycles. However, if the error P0340 left, you can:

1. Reset errors using the scanner.
2. Disconnect the battery for 10–15 minutes (to reset the ECU memory).
3. Drive 5–10 km in gentle mode (without sudden acceleration).

Is it possible to clean the camshaft sensor?

Yes, but only outer part (housing and connector). To clean use:

• 🧴 Contact cleaner (For example, CRC or WD-40 Contact Cleaner).
• 🧼 Cotton buds to remove dirt from the connector.

Do not disassemble the sensor or try to clean its insides - this will damage the magnetic element. If the sensor is dirty internally (for example, metal shavings), it must be replaced.

What other sensors can cause similar symptoms?

On Almera Classic Malfunctions give similar symptoms:

• 🔧 Crankshaft sensor (CPCV) - the engine does not start at all.
• 🔥 Knock sensor - error P0325, “knock of fingers” during acceleration.
• 💨 Mass air flow sensor (MAF) - error P0100, high idle speed.
• ⚡ Ignition coils - misfires, errors P030X (where X is the cylinder number).

For accurate diagnosis it is better to use a scanner OBD-II.