Camshaft sensor on Nissan Almera Classic: diagnostics, errors and do-it-yourself replacement

Nissan Almera Classic (also known as Nissan Sunny N16 in some markets) is a reliable sedan, but even it has its weaknesses. One of them is Camshaft position sensor (CPR), or phase sensor. Its malfunction leads to engine malfunctions, increased fuel consumption and even the inability to start the car. In this article we will look at how accurately determine sensor failure on Almera Classic with QG15DE/QG16DE/QG18DE engines, what errors it gives, and how to replace it yourself without contacting service.

The camshaft sensor is responsible for synchronizing the operation of the injection and ignition systems. It reads the position of the camshaft and transmits the data to ECU (electronic control unit), which adjusts the timing of fuel and spark supply. If the sensor fails, the engine goes into emergency mode, which is fraught with serious consequences. For example, on Almera Classic With an automatic transmission, a faulty DPRV can cause jerks when changing gears or the transmission locking in one mode.

Signs of a malfunctioning camshaft sensor on a Nissan Almera Classic

Symptoms of DPRV failure Almera Classic often confused with malfunctions of other systems - for example, problems with spark plugs or fuel pumps. However, there are specific signs that directly indicate a phase sensor:

• 🔥 Floating speed at idle speed (tachometer needle twitches in the range of 500–1500 rpm).
• ⚡ Misfires in one or more cylinders, especially during cold starts.
• 🛢️ Increased fuel consumption by 15–25% for no apparent reason (for example, from 8 to 10–11 l/100 km).
• 🚗 Difficulty starting the engine — the starter turns, but the engine does not “catch” or starts only after 2-3 attempts.
• ⚠️ Check Engine light on with errors P0340, P0345 or P0335 (more about them in the next section).

On Nissan Almera Classic with engine QG16DE A faulty camshaft sensor may also appear loss of power when overtaking or going uphill. The car seems to be “stupid”, does not respond to the gas pedal, and the malfunction indicator flashes on the dashboard. In some cases, the ECU completely disables fuel injection in one of the cylinders, which leads to vibrations and unstable engine operation.

⚠️ Attention: If on your Almera Classic errors appeared at the same time P0340 (no signal from the camshaft sensor) and P0325 (problems with the knock sensor), do not rush to change both sensors. First check the power circuit and ground - often the problem lies in oxidized contacts or damaged wiring.

Camshaft sensor error codes and their interpretation

When scanning Nissan Almera Classic diagnostic scanner (for example, Launch CReader or ELM327) a faulty DPRV is manifested by the following codes:

Error code	Description	Probable Cause	Criticality level
P0340	There is no signal from the camshaft position sensor	Sensor faulty, open circuit, contact oxidation	⭐⭐⭐⭐ (high)
P0345	Incorrect camshaft sensor signal (out of range)	Damage to the sensor, misalignment of the mark on the camshaft, problems with the computer	⭐⭐⭐ (average)
P0335	Malfunction of the crankshaft position sensor circuit (secondary error for problems with DPRV)	Problems with synchronization of crankshaft and camshaft signals	⭐⭐⭐⭐ (high)
P0300	Multiple misfires	Consequence of incorrect data from the DPRV leading to incorrect injection	⭐⭐ (low)

Error P0340 - the most common Almera Classic. It may appear periodically (for example, in humid weather due to water getting into the sensor connector) or constantly. If the code only occurs when the engine is cold, the problem often lies in crack in the sensor housing or wear and tear of its internal electronics. On a hot engine, the sensor may temporarily “go away”, but the problem cannot be ignored - over time it will lead to serious malfunctions in the operation of the ECU.

For accurate diagnostics, it is recommended not only to read errors, but also to check the sensor parameters in real time. For example, using the program Nissan Consult or a universal scanner, you can see whether the DPRV produces a signal when the engine is rotated by the starter. If the readings are missing or fluctuate chaotically, the sensor must be replaced.

Where is the camshaft sensor located on Nissan Almera Classic?

On Nissan Almera Classic with engines QG15DE, QG16DE And QG18DE The camshaft position sensor is installed in the upper part 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).
• 🔧 Attaches with one bolt to 10 mm.
• 🔌 Has a connector with three wires: +5V (food), GND (mass) and SIGNAL (signal wire).

To get to the sensor you need to:

1. Remove the decorative engine cover (if installed).
2. Disconnect the power connector by pressing the latch.
3. Unscrew the fastening bolt with a wrench 10 mm.
4. Carefully remove the sensor from its seat.

On some versions 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 dismantle the interfering elements or work using an extension for the key.

How to distinguish a camshaft sensor from a crankshaft sensor?

The camshaft sensor on the Almera Classic has a more compact housing (about 5 cm in length) and is located in the upper part of the cylinder head. The crankshaft sensor is larger, located on the oil pan closer to the gearbox and has a two-pin connector (as opposed to the three-pin connector for the DPRV).

How to check the camshaft sensor for functionality?

Before replacing the sensor, it must be checked - often the problem lies in the wiring or connector. For diagnosis you will need:

• 🔧 Multimeter (in voltmeter and ohmmeter mode).
• 🔌 A screwdriver with a flat blade (for pressing the connector lock).
• 📊 Diagnostic scanner (optional, to check the signal).

Step 1. Checking power and mass

Disconnect the sensor connector and turn on the ignition (do not start the engine). Use a multimeter to measure the voltage between the contacts +5V (usually the middle wire) and GND (ground, often black or brown wire). Normal value - 4.5–5.2 V. If there is no voltage, check the fuse EF15 (10A) in the mounting block and wiring integrity.

Step 2. Checking the winding resistance

Set the multimeter to ohmmeter mode and measure the resistance between the signal contact and ground. For original sensor Nissan (article 23731-4M200 or 23731-4M205) normal resistance - 500–700 Ohm. If the readings tend to zero or infinity, the sensor is faulty.

Step 3: Check Signal (Advanced Method)

To do this, you will need to connect a multimeter in millivoltmeter mode to the signal wire and rotate the engine with the starter. A working sensor should produce an alternating voltage in the range 0.3–4.7 V. If there is no signal or is stable at zero, the sensor must be replaced.

⚠️ Attention: On Almera Classic with engine QG18DE When checking the camshaft sensor, be sure to disconnect the connector knock sensor (located on the cylinder block). Otherwise, the ECU may generate false errors due to signal conflicts.

Choosing a new sensor: original vs analogues

For Nissan Almera Classic The original camshaft sensor has the following part numbers:

• 23731-4M200 (for engines QG15DE/QG16DE).
• 23731-4M205 (for QG18DE).

The cost of the original is from 3,500 to 5,000 rubles. However, there are high-quality analogues on the market that are not inferior in reliability:

Manufacturer	Article	Price, rub.	Features
Bosch	0 261 210 115	2 200–2 800	High signal accuracy, suitable for all QG series motors
Denso	5503100	2 500–3 000	Original supplier for Nissan, long service life
ERA	550433	1 500–1 900	Budget option, but build quality is worse than the original
Febi	23731	2 000–2 400	Good price/performance ratio, suitable for QG16DE

When choosing an analogue, pay attention to body material - for the original sensor it is made of heat-resistant plastic, while cheap fakes often use fragile ABS plastic, which cracks when the temperature changes. Also check availability magnetic core — without it, the sensor will not be able to correctly read the camshaft position.

If you buy a used sensor (for example, at a disassembly site), be sure to check its resistance and external condition. There should be no cracks on the case, and the connector contacts should not be oxidized. Even minor damage can cause the sensor to malfunction 1-2 months after installation.

Step-by-step instructions for replacing the camshaft sensor

Replacing the DPRV with Nissan Almera Classic takes no more than 20–30 minutes and does not require special tools. You will need:

• 🔧 Key on 10 mm (or ratchet head).
• 🔨 Screwdriver with a flat blade (for the connector lock).
• 🧴 WD-40 or similar lubricant (if the bolt is stuck).
• 🧤 Clean gloves (so as not to contaminate the new sensor).

Step 1. Preparation

Disconnect the negative terminal of the battery to avoid short circuit. Remove the decorative engine cover (if there is one) and clean the area around the sensor from dirt - this will prevent debris from getting into the mounting hole.

Step 2. Removing the old sensor

1. Press the connector latch and disconnect it from the sensor.
2. Key on 10 mm Unscrew the fastening bolt.
3. Carefully remove the sensor by rocking it from side to side (do not use excessive force to avoid breaking the housing!).

Step 3: Install a new sensor

1. Clean the seat from oil and dirt (you can use alcohol or carburetor cleaner).
2. Install the new sensor, aligning it with the groove on the block head.
3. Tighten the fastening bolt (tightening torque - 8–10 Nm, do not overtighten!).
4. Connect the connector until the latch clicks.

Step 4. Check

Connect the battery and start the engine. If the error P0340 disappeared, and the engine runs smoothly - the replacement was successful. If Check Engine is still on, reset the errors with a scanner or by disconnecting the battery terminal for 10 minutes.

⚠️ Attention: On Almera Classic With an automatic transmission, it may be necessary to replace the camshaft sensor throttle adaptation. To do this you need:

1. Start the engine and warm up to operating temperature.
2. Turn off the ignition for 10 seconds.
3. Repeat the start and let the engine run for 1-2 minutes at idle speed.

If adaptation does not help, contact the service to reset adaptations via Nissan Consult.

Common replacement mistakes and how to avoid them

Even experienced car owners sometimes make mistakes when replacing DPRV with Almera Classic. Here are the most common ones:

• 🔧 Tightening the fastening bolt - this leads to deformation of the sensor body and its incorrect operation. The tightening torque should not exceed 10 Nm.
• 🔌 Incomplete connector connection - if the latch does not click, the contact will be unreliable and the error P0340 will be back in a few days.
• 🧴 Dirt getting into the mounting hole — even small particles can disrupt the operation of the sensor. Always clean the installation area.
• 🔄 Using a sensor from another engine - for example, a sensor from QG15DE not suitable for QG18DE, despite the external similarity.
• 🚗 Ignoring check after replacement - if you do not reset the errors and test the engine, you may miss other problems (for example, faulty wiring).

Another common mistake is buying a sensor without checking its resistance. Even a new sensor may be defective, so before installation, be sure to measure the resistance between the signal contact and ground (there should be 500–700 Ohm).

If the problem persists after replacing the sensor, check:

• Integrity of the wiring from the sensor to the ECU (wires near the exhaust manifold often fray).
• Condition toothed disc on the camshaft - if it is damaged, the sensor will not be able to read the signal.
• Job ECU - in rare cases, the control unit may be faulty.

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. The engine will operate in emergency mode, which will lead to:

• Increased fuel consumption (up to +30%).
• Loss of power (especially noticeable when overtaking).
• Accelerated wear of the catalyst due to incorrect composition of the fuel mixture.

On Almera Classic With an automatic transmission, long-term driving with a faulty air flow control valve can lead to transmission malfunctions.

How to distinguish a faulty camshaft sensor from problems with the crankshaft sensor?

Main differences:

Symptom	Camshaft sensor	Crankshaft sensor
The engine stalls while driving	Rarely	Often
Won't start at all	Starts, but is difficult	Doesn't start at all
Errors in the ECU	P0340, P0345	P0335, P0336

If the engine does not start at all, in 90% of cases the crankshaft sensor is to blame.

How long does the camshaft sensor last on Almera Classic?

Service life of the original sensor - 100,000–150,000 km. However, it may fail earlier due to:

• Oil or antifreeze gets on the connector.
• Engine overheating (for example, with a faulty thermostat).
• Mechanical damage (impacts during repairs).

Analogues serve on average 60,000–80,000 km, but quality brands (for example, Bosch or Denso) can work longer.

Is it possible to clean the camshaft sensor?

Cleaning is possible only in one case - if there is oxidation or dirt. To do this:

1. Remove the sensor and wipe its housing with alcohol.
2. Clean the connector contacts with an eraser or a special liquid (for example, Contact Cleaner).
3. Blow out the seat with compressed air.

If the sensor is faulty due to internal damage (broken winding, cracked housing), cleaning will not help - replacement is required.

Where to buy an original sensor for Almera Classic?

Original sensors Nissan can be purchased:

• In official dealerships (1 year warranty, but the price is higher).
• In trusted online stores (for example, Exist.ru, Autodoc, Emex).
• On disassembly (cheaper, but without a guarantee - be sure to check before buying!).

The cost of the original is from 3,500 rubles. When purchasing, check whether the sensor is suitable for your engine type (QG15DE/QG16DE/QG18DE).