The crankshaft position sensor (CPS) is one of the most critical elements of the engine management system. Nissan Almera Classic (models B10 And N16 with motors GA16DE, QG15DE, QG18DE). Its failure leads to a complete stop of the engine or serious malfunctions. Despite its simple design, this sensor often causes “unexplained” problems: from floating speed to the inability to start the car.

In this article we will analyze all symptoms of DPKV malfunction, we will learn how to check it with a multimeter and an oscilloscope, and also show you how to replace the sensor yourself - with photos and step-by-step instructions. We will pay special attention specific "jambs" of Almera Classic, which are not described in standard manuals: for example, why a new sensor may not work due to corrosion on the connector, or how to fool the ECU when driving temporarily without DPKV.

1. How does the crankshaft sensor work on Almera Classic?

DPKV on Nissan Almera Classic — inductive type (unlike Hall sensors on some modern cars). It reads pulses from a ring gear mounted on the flywheel or crankshaft pulley. Working principle:

  • 🔄 The crown has 58 teeth with two teeth missing (the so-called “zero” gap) - this is a synchronizing mark for the ECU.
  • 📡 The sensor generates alternating current as the teeth pass past its core.
  • 🖥️ The ECU analyzes the frequency and amplitude of the signal, determining the position of the crankshaft, engine speed and the moment of spark/fuel supply.

On Almera Classic the sensor is located on rear of the cylinder block (from the gearbox side), next to the flywheel. He is easily identified by long wire with connector, which goes to the ECU wiring harness. Feature of the model: on QG15DE/QG18DE motors the sensor is attached with one M6 bolt, which often sticks - when replacing it it is easy to break.

📊 What engine does your Almera Classic have?
  • GA16DE (1.6 l)
  • QG15DE (1.5 l)
  • QG18DE (1.8 l)
  • Other

2. Signs of a faulty crankshaft sensor

Symptoms of DPKV failure on Nissan Almera Classic can be divided into three groups: critical (the car does not drive), medium (it drives, but poorly) and hidden (diagnosed only by a scanner).

Fault type Symptoms Error code (if any)
Critical The engine does not start, the starter spins “idling”, there is no spark and no fuel injection P0335, P0336
Average Floating speed, failures during acceleration, detonation, loss of power P0300 (multiple misfires)
Hidden Periodic "glitches" of the tachometer, difficulty starting "hot" There may be no mistakes!

⚠️ Attention: On Almera Classic with motor GA16DE faulty DPKV is often disguised as problems with camshaft sensor (P0340). If the scanner shows both errors, start diagnosing with the crankshaft!

One more unique symptom for Almera: if the DPKV fails The cooling fan may turn on immediately after turning the ignition key (even on a cold engine). This is due to the fact that the ECU does not receive a signal about the rotation speed and activates emergency modes.

3. How to check the crankshaft sensor on Almera Classic?

Diagnosis of DPKV can be done in three ways: visual inspection, test with a multimeter And checking with an oscilloscope. Let's start with the simplest.

3.1. Visual inspection

Remove the sensor (unscrew one bolt M6 and carefully pull it out of its seat). Please note:

  • 🔍 Cracks or chips on the housing (especially at the base of the connector).
  • 🧲 Metal shavings at the end of the sensor - a sign of wear on the flywheel ring.
  • 🟢 Oxidation of contacts in the connector (a common problem on Almera due to its close location to the exhaust manifold).

3.2. Checking with a multimeter

Switch the tester to resistance measurement mode (2000 Ohm). Connect the probes to the sensor terminals (polarity is not important). Normal resistance for Almera Classic:

  • 📊 550–750 Ohm (for motors GA16DE/QG15DE).
  • 📊 650–850 Ohm (for QG18DE).

If resistance 0 ohm (short circuit) or ∞ (break) - the sensor is faulty. Also check isolation: one probe on the sensor body, the second on any output. There must be resistance ∞.

Remove the sensor and inspect for damage|

Check winding resistance (550-850 ohms)|

Check insulation (should be ∞)|

Inspect the connector for oxidation|

Check the power circuit (12V at the connector with the ignition on) -->

3.3. Checking with an oscilloscope (the most accurate method)

Connect the oscilloscope to the sensor terminals (in AC). Start the engine (or crank the starter). healthy signal should look like this:

  • 📈 Pulse amplitude: 0.5–1.5 V (depending on rpm).
  • 📏 The length of the “failure” (sync pulse) is exactly two teeth.
  • 🔄 There is no “bouncing” or missing impulses.

⚠️ Attention: On Almera Classic with mileage >150 thousand km, the flywheel ring gear often wears out. If the oscillogram shows uneven pulses or “double” peaks - the problem may not be in the sensor, but in the mechanical part!

What to do if you don't have an oscilloscope?

Can be used LED probe (LED + 1 kOhm resistor). Connect it to the sensor terminals and crank it with the starter. A working DPKV will blink the LED with a frequency proportional to the crankshaft speed. If there is no blinking or they are chaotic, the sensor is faulty.

4. Replacing the crankshaft sensor on Nissan Almera Classic

To replace you will need:

  • 🔧 Head on 10 mm (for fastening bolt).
  • 🔧 Extension and ratchet handle.
  • 🧲 Magnet (so as not to drop the bolt into the pan).
  • 🧴 Mediator lubricant (to protect the new sensor from corrosion).

Step by step instructions:

  1. Disable negative battery terminal (required!).
  2. Disconnect the sensor connector (press the lock and pull up).
  3. Unscrew the fastening bolt (it often sticks - do not use excessive force!).
  4. Carefully pull out the sensor. If it "sits" tightly, rock it from side to side.
  5. Clean the seat from dirt and metal shavings.
  6. Install a new sensor (original part number: 23731-4M200 or analogues ERA 550463, FEBI 27326).
  7. Tighten the bolt firmly 8–10 Nm (do not overtighten!).
  8. Connect the connector and battery terminal.

⚠️ Attention: On Almera Classic after replacing the DPKV no need to reset adaptations (as opposed to the camshaft sensor). However, if the engine does not start, check:

  • 🔌 Connector polarity (mixed up wires are a common mistake!).
  • 🔧 The gap between the sensor and the flywheel crown (must be 0.5–1.5 mm).
💡

Before installing a new sensor, apply a thin layer mediator lubricant at its end. This will prevent corrosion and make future replacement easier.

5. Common mistakes when replacing and how to avoid them

Even experienced craftsmen make mistakes when working with DPKV on Nissan Almera Classic. Here are the most common:

  • 🔧 Broken mounting bolt. The bolt often gets stuck - do not try to unscrew it by force. Use WD-40 or heat the bolt with a hair dryer. As a last resort, drill it out and cut a new thread. M6×1.0.
  • 🔌 Damaged connector. On Almera, the wiring to the DPKV often rubs against the gearbox bracket. Check the integrity of the insulation and solder damaged wires.
  • 🧲 Metal shavings. If there were chips on the old sensor, be sure to check the condition of the flywheel crown! A worn ring will lead to rapid failure of the new DPKV.

One more non-obvious problem: After replacing the sensor, the engine may run unstably due to magnetization of metal chips on the flywheel. Solution:

  1. Remove the starter and clean the flywheel of chips.
  2. Check the flywheel runout (tolerance: no more than 0.3 mm).
💡

If after replacing the DPKV the engine does not start, but the starter turns, check sensor power circuit (12V on the connector when the ignition is on). Often the problem lies in a broken wire or an oxidized contact in the ECU.

6. How much does the sensor cost and where is the best place to buy?

Prices for DPKV for Nissan Almera Classic vary depending on the manufacturer and place of purchase:

Manufacturer Article Price (RUB) Where to buy
Original (Nissan) 23731-4M200 2500–3800 Official dealers, Exist.ru
ERA (Italy) 550463 800–1200 Autodoc, Autosphere
FEBI (Germany) 27326 1100–1500 Emex, Spare parts stores
StartVolt (Russia) SC210101 500–700 Ozon, Wildberries

⚠️ Attention: On Almera Classic Sensors are often counterfeited ERA And FEBI. The original ERA has:

  • 🏷️ Hologram on the package.
  • 🔍 Logo engraved on the body (not a sticker!).
  • 📦 Comes with an O-ring.

If your budget is limited, you can take StartVolt - it's cheaper, but service life ~30–50 thousand km. For a long-term solution, the original is better or FEBI.

7. Is it possible to drive without a crankshaft sensor?

Technically - no. Engine Nissan Almera Classic will not start without a signal from the DPKV, since the ECU will not be able to determine the position of the crankshaft to supply spark and fuel. However there is temporary solutions for emergency situations:

  • 🔧 "Dummy" ECU. Some craftsmen connect a resistor 680 Ohm between the contacts of the DPKV connector. This allows you to start the engine, but it will work extremely unstable (only for getting to the service station!).
  • 📡 Flashing the ECU. On some firmware versions you can disable the DPKV check, but this requires specialized equipment.

⚠️ Attention: Driving without DPKV or with a “bleeder” leads to:

  • 💥 Detonation (due to incorrect ignition timing).
  • 🔥 Overheating (The ECU does not adjust the mixture composition).
  • 🚗 Increased wear piston group.

If the sensor fails on the road, the best option is towing or call a tow truck. "Collective farm" methods of starting an engine are justified only in hopeless situations!

Frequently asked questions (FAQ)

🔧 What gap should be between the crankshaft sensor and the flywheel on Almera Classic?

Optimal clearance - 0.5–1.5 mm. If the gap is larger, the signal will be weak (especially at high speeds). If less, there is a risk of mechanical damage to the sensor due to beating of the flywheel. Checked using feeler gauge or caliper.

🚗 Is it possible to clean the crankshaft sensor if it is dirty?

Yes, but only mechanical part (the end that faces the flywheel). Use lint-free cloth And isopropyl alcohol. Do not use acetone or gasoline - they will damage the plastic case. If the problem is in the winding (break or short circuit), cleaning will not help - only replacement.

🔍 Why doesn't the new crankshaft sensor work?

The reasons may be the following:

  1. 🔌 Poor contact in the connector (oxidation or wire break).
  2. 🧲 Metal shavings on flywheel (magnetized and interferes with signal reading).
  3. 🔧 Incorrect clearance between the sensor and the ring.
  4. 🖥️ ECU malfunction (less often, but it happens).

Check first connector voltage (must be 12V with the ignition on). Then use an oscilloscope to verify that the sensor generates a signal.

💰 How much does it cost to replace a crankshaft sensor in a service?

Cost of work in services:

  • 🔧 Standard replacement: 800–1500 rub.
  • 🔧 Replacement with flywheel cleaning: 2000–3000 rub.
  • 🔧 Diagnostics + replacement: 2500–4000 rub.

Self-replacement takes 20–40 minutes and allows you to save up to 3000 rub..

📊 What errors does the ECU give when there are problems with DPKV?

On Nissan Almera Classic most often found:

  • P0335 — malfunction of the DPKV circuit.
  • P0336 — DPKV signal is outside the permissible range.
  • P0300 — random/multiple misfires (indirect sign).
  • P0340 - camshaft sensor error (often appears along with P0335).

If there are no errors, but there are symptoms, check oscillogram or use a tester to measure the sensor resistance.