Camshaft position sensor (DPRV, also known as phase sensor) on Nissan Almera Classic - A critical element of the engine management system. Its incorrect operation leads to ignition failures, increased fuel consumption and even the inability to start the engine. Owners Almera Classic (especially with engines QG15DE And QG18DE) often encounter errors P0340 or P0345, which directly indicate problems with this sensor.

Unlike the crankshaft sensor, which is located at the bottom of the cylinder block, the camshaft sensor is located on Almera Classic "hiding" in a less obvious place. Finding it is complicated by the dense layout of the engine compartment and the presence of plastic protective covers. In this article you will find exact coordinates of the sensor location with reference to visual landmarks, as well as step-by-step diagnostic instructions without using an expensive scanner.

Design and principle of operation of the camshaft sensor on Almera Classic

Phase sensor on Nissan Almera Classic refers to inductive type (in some modifications - based on the Hall effect). Its main task is to fix the angular position of the camshaft and transmit a signal to ECU (electronic control unit) for the correct formation of injection and ignition pulses. Unlike the crankshaft sensor, which reads the revolutions, the DPRV is responsible for phasing of cylinders.

Structurally, the sensor consists of:

  • 🧲 Permanent magnet (in inductive models) or semiconductor element (in Hall sensors)
  • 🔌 Housings with a connector for connecting to the wiring harness
  • 📶 A sensing element that reacts to a metal tooth or recess on the camshaft master disc
  • 🔧 Mounting flange with a bolt hole (usually M6)

On Almera Classic with engines QG15DE/QG18DE sensor generates one pulse per full revolution of the camshaft (unlike the crankshaft sensor, which produces a signal with each pulley tooth). This allows ECU accurately determine the position of the piston in the compression stroke for the first cylinder and synchronize the operation of the injectors.

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If after replacing the camshaft sensor the engine does not start, check for metal shavings at its end - they may block the signal. Clean the sensor and reinstall.

Where is the camshaft sensor located on Nissan Almera Classic: photo and diagram

On Nissan Almera Classic (body B10 And N16) the camshaft sensor is located on the cylinder head on the air filter side. Exact location:

  • 🔍 Under the plastic valve cover (when viewed from the front of the car - to the left of the oil filler neck)
  • 🔧 Near the first cylinder, closer to the front of the engine
  • 🔌 Connected to gray wiring harness (connector with lock)

Visually, the sensor is a cylindrical body with a diameter of ~20 mm with a protruding wire 15–20 cm long. To access it you need to:

  1. Remove the decorative plastic engine cover (snap off the 4 clips).
  2. Disconnect the sensor's power connector (press the latch and pull up).
  3. Unscrew the fastening bolt with a wrench 10 mm.
How to distinguish a camshaft sensor from a crankshaft sensor?

The crankshaft sensor on the Almera Classic is located at the bottom of the cylinder block, next to the generator drive pulley. It has a more massive body and is connected to a harness with a thick black wire. The DPRV is located on the cylinder head and has a gray connector.

Engine model Exact sensor location Original sensor code Analogs (articles)
QG15DE (1.5 l) Cylinder head, to the left of the oil filler neck 23731-4M500 BOSCH 0 261 210 115, ERA 550453
QG18DE (1.8 l) Cylinder head, under the plastic casing, next to the 1st cylinder 23731-4M510 DENSO 550101, FEBI 35330
GA16DE (1.6 l, rare) Cylinder head, intake manifold side 23731-6J000 HITACHI CPS-A003

Important: On Almera Classic with a QG18DE engine, the camshaft sensor may be hidden under the metal screen of the fuel rail. To access it you will need to remove the ramp or bend the screen.

📊 What engine is installed on your Almera Classic?
  • QG15DE (1.5 l)
  • QG18DE (1.8 l)
  • GA16DE (1.6 l)
  • Other

Symptoms of a Malfunctioning Camshaft Sensor

Malfunction of DPRV on Nissan Almera Classic manifests itself as typical mistakes in memory ECU, so behavioral symptoms engine. The most common signs:

  • ⚠️ Check Engine light comes on with errors P0340 (“Phase sensor circuit malfunction”), P0345 (“Incorrect sensor signal”) or P0335 (if the problem also affects the crankshaft sensor).
  • 🔥 Poor engine starting (especially when “hot”), prolonged cranking of the starter.
  • ⛽ Increased fuel consumption (by 10–15%) due to suboptimal injection.
  • 🚗 Jerks and dips during acceleration at speeds of 2000–3000 rpm.
  • 🔧 Power drop and “dullness” of the engine under load.

Feature Almera Classic is that if the DPRV breaks down ECU goes into emergency modeusing only the signal from the crankshaft sensor. In this case:

  • The engine starts but is unstable.
  • The variable valve timing system (if equipped) is disabled.
  • The toxicity of the exhaust increases (an error on the lambda probe may light up).
⚠️ Attention: If the dashboard flashes Check Engine and the engine stalls 2-3 seconds after starting, the problem may not be in the sensor, but in power supply circuit break or damage to the connector. Check contacts for oxidation!

How to check the camshaft sensor on Almera Classic without a scanner

You can diagnose DPRV yourself using multimeter or even LED probe. Below are step-by-step instructions for both methods.

Method 1: Test with a multimeter (measure resistance and voltage)

To test an inductive sensor:

  1. Remove the sensor from the engine (disconnect the connector and unscrew the bolt).
  2. Switch the multimeter to resistance measurement mode (200 Ohm).
  3. Connect the probes to the sensor terminals. Normal resistance for Almera Classic: 500–700 Ohm.
  4. If resistance 0 ohm (short circuit) or ∞ (break), the sensor is faulty.

For Hall sensors:

  1. Connect +12V to one of the contacts (usually the central one), and minus - to the body.
  2. Measure the voltage on the signal wire. When a metal object rotates near the end of the sensor, the voltage should change in the range 0–5V.

Method 2: Check with an oscilloscope or LED probe

A more accurate way is to analyze the signal with an oscilloscope. Connect the test leads to the signal wire and ground, then crank the engine with the starter. Healthy sensor will show even pulses with amplitude 0–5V and clear fronts. If the signal is “smeared” or absent, the sensor needs to be replaced.

For express testing without instruments:

  • Disconnect the sensor connector.
  • Start the engine. If he won't start — the problem is definitely in the DPRV or its circuit.
  • If the engine starts (albeit with difficulty), the malfunction may be in contamination of the sensor with metal shavings.

Clean the installation site from oil and dirt|Check the integrity of the connector and wires|Compare the new sensor with the old one by article number|Apply thermal paste to the end of the sensor (for better contact)|Tighten the bolt with a torque of 8–10 Nm-->

Step-by-step replacement of the camshaft sensor on Nissan Almera Classic

Replacing the DPRV with Almera Classic takes no more than 20 minutes. You will need:

  • 🔧 Key on 10 mm (or head with extension).
  • 🧴 Heat-resistant paste (optional, for better contact).
  • 🧤 Gloves (so as not to contaminate the sensitive element of the sensor).

Instructions:

  1. Disconnect the negative battery terminal (to avoid mistakes ECU).
  2. Remove the decorative engine cover (snap off the 4 plastic clips).
  3. Press the sensor connector lock and disconnect it. Check contacts for oxidation.
  4. Unscrew the sensor mounting bolt with a wrench 10 mm and carefully remove it.
  5. Clean the seat from oil and metal shavings (use WD-40 and a lint-free cloth).
  6. Install the new sensor by aligning the protrusions on the housing with the grooves in the cylinder head. Tighten the bolt firmly 8–10 Nm.
  7. Connect the connector and return the decorative cover to its place.
  8. Connect the battery and start the engine. Let it idle for 2-3 minutes.
⚠️ Attention: If after replacing the sensor the error P0340 remains, reset it through the diagnostic connector or by disconnecting the battery for 10 minutes. If the error appears again, check the sensor's power supply circuit (open or short circuit to ground).
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On an Almera Classic with a QG18DE engine, when replacing the camshaft sensor, be sure to check the condition of the sealing ring. Its damage leads to air leaks and false errors in the intake system.

Frequent mistakes when diagnosing and replacing DPRV

Even experienced car owners make mistakes when working with the camshaft sensor. Here are the most common:

  • 🔧 Ignoring connector check. Oxidized or damaged contacts can simulate a sensor failure. Always clean the connector WD-40 or contact lubricant.
  • 🔍 Confusion with sensors. On Almera Classic The camshaft sensor is often confused with the knock sensor (located on the cylinder block) or temperature sensor (built into the thermostat).
  • 🛠️ Incorrect bolt tightening. Weak tightening leads to vibrations of the sensor, and excessive tightening leads to damage to the housing. Use a torque wrench!
  • 🚗 Replacement without resetting errors. After installing a new sensor an error P0340 need to reset, otherwise ECU will continue to operate in emergency mode.

Another typical problem is ingress of metal shavings to the end of the sensor. On Almera Classic with a mileage of more than 150 thousand km, this occurs in 30% of cases. Chips occur due to wear on the camshaft or bearing bed. If after replacing the sensor the error returns after 1–2 thousand km, you need to flushing the oil system or cylinder head repair.

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

Is it possible to drive with a faulty camshaft sensor?

Technically possible, but not recommended. ECU will go into emergency mode using only the signal from the crankshaft sensor. This will lead to:

  • Increased fuel consumption (up to +20%).
  • Loss of power (especially at rpm above 3000).
  • Unstable operation at idle.
  • Increased load on the catalyst (may fail).

On Almera Classic with engine QG18DE Driving for a long time with a faulty air pressure control valve can lead to overheating of the 1st cylinder due to incorrect injection.

Which camshaft sensor is better to choose for replacement: original or analogue?

Original sensors (Nissan 23731-4M500/4M510) more reliable, but more expensive (from 3,500 rubles). High-quality analogues:

  • BOSCH 0 261 210 115 — the best option in terms of price/quality (~2200 rubles).
  • DENSO 550101 - a high resource, but there are fakes.
  • ERA 550453 - a budget option (~1500 rubles), but more often fails.

When purchasing, check:

  • The presence of a hologram and factory markings.
  • Winding resistance (must be 500–700 Ohm).
  • Integrity of the O-ring.
Why doesn't P0340 go away after replacing the sensor?

The reasons may be as follows:

  1. Damaged wiring from sensor to ECU (check the circuit for open circuit with a multimeter).
  2. Faulty itself ECU (rare, but found on cars with mileage >200 thousand km).
  3. The drive disk is misaligned on the camshaft (for example, after repairing the cylinder head).
  4. Error not cleared (disconnect the battery for 10 minutes or use a diagnostic scanner).
  5. Defective new sensor (check its resistance before installation).

On Almera Classic with engine QG18DE common problem - corrosion of contacts in the connector ECU (the unit is located under the glove compartment). Clean your contacts Pin 27 And Pin 45 (for DPRV).

Is it possible to clean the camshaft sensor instead of replacing it?

Yes, but only if the problem is contamination of the sensitive element with metal shavings. To clean:

  1. Remove the sensor from the engine.
  2. Wipe the end with a lint-free cloth soaked in isopropyl alcohol or WD-40.
  3. Blow with compressed air (do not use metal brushes!).
  4. Check the winding resistance (should be within normal limits).

If after cleaning the error remains, the sensor must be replaced. Do not clean Hall sensors (they are not restored).

How to check the camshaft sensor power circuit?

To check the circuit:

  1. Disconnect the sensor connector.
  2. Turn on the ignition (without starting the engine).
  3. Multimeter in mode 20V DC measure the voltage between:
    • Red dipstick → central contact of the connector.
    • Black dipstick → weight (for example, a bolt on the cylinder head).
  • Normal Voltage: 12V (food) and 5V (signal).
  • If there is no voltage, check the fuse EF15 (10A) in the mounting block and the integrity of the wires.

    • On Almera Classic DPRV wires often rub against the intake manifold. Inspect the harness for damage to the insulation.