Removing the speed sensor on a Nissan Almera Classic: instructions with photos and nuances

Why does the speed sensor fail and when should it be removed?

Speed sensor (DS) on Nissan Almera Classic - A critical element of the engine management system. It transmits data about driving speed to the ECU, which adjusts the fuel supply, transmission operation (on automatic transmission) and even the speedometer readings. Symptoms of a problem often confused with transmission or electronics problems: floating idle speed, non-working speedometer, error P0500 (no DS signal) or P0503 (intermittent signal).

On models Almera Classic (body B10 And N16) the sensor is located on the gearbox - it is removed to replace, clean contacts or diagnose wiring. The peculiarity of this model: the sensor is mounted on a plastic fitting, which over time cracks from vibrations, causing oil leakage from the gearbox. If you ignore the problem, oil will get onto the contacts, which will lead to a short circuit or complete failure of the DC.

Preparing for work: tools and safety precautions

Before you begin dismantling, make sure you have everything you need. You will have to work from below the car, so necessarily use a viewing hole, overpass or lift. If there are none, lift the car with a jack and secure it with stops (working on one jack is dangerous!).

List of tools and materials:

• 🔧 Socket wrench or socket on 10 mm (for the DS mounting bolt).
• 🔌 Screwdriver with a flat blade (for disconnecting the connector).
• 🧤 Gloves (the sensor is often covered with oil and dirt).
• 🧴 A rag and contact cleaner (for example, WD-40 or CRC).
• 🔋 Multimeter (to check the DC after removal).
• 🛢️ Thread sealant (if you plan to reinstall the old sensor).

⚠️ Attention: On Almera Classic with automatic transmission before removing the sensor necessarily Relieve pressure in the torque converter. To do this, turn off the engine, move the selector to position P and wait 10–15 minutes. Otherwise, when the connector is disconnected, oil under pressure may splash onto the electrics.

Where is the speed sensor: diagram and photo

On Nissan Almera Classic The speed sensor is located on the top of the gearbox, closer to the engine shield. It is easy to identify by:

• 🔍 Plastic case with a protruding wire (usually black or gray).
• 🔌 3-pin connector (on some versions - 2 contacts).
• 🔧 The only fastening bolt on 10 mm.

Below is a layout diagram for different types of gearboxes:

Gearbox type	DS location	Features
Mechanics (5-speed)	On top of the gearbox, next to the speedometer drive	The sensor is inserted into a plastic fitting, oil often leaks
Automatic (4-speed)	On the back of the gearbox, closer to the cabin	The connector is protected by a rubber boot, the bolt can be star-shaped
Automatic (CVT)	On the side of the gearbox, next to the valve body	The sensor is integrated with the control unit, requires care

How to distinguish a speed sensor from a crankshaft position sensor?

On Almera Classic The crankshaft sensor is located on the cylinder block (below the ignition coil) and has 2-pin connector. The speed sensor is always on the gearbox and has 3 contacts (signal, ground, power supply +12V).

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Step-by-step instructions for removing the speed sensor

The dismantling process takes 15–30 minutes depending on the type of gearbox. Follow the instructions strictly step by step to avoid mistakes:

1. Disconnect the negative battery terminal. This will prevent short circuits when working with the wiring.

2. Find the sensor according to the diagram above and clean it from dirt with a rag. If the connector is covered with oil, treat it WD-40.

3. Disconnect the connector. Press the latch (usually a plastic tab) and pull the connector up. Don't pull the wires!

4. Unscrew the fastening bolt key on 10 mm. On automatic machines the bolt may be star-shaped T20.

5. Carefully pull out the sensor. It sits in a seat with a rubber seal - do not use force so as not to break the fitting.

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⚠️ Attention: On manual transmissions Almera Classic after removing the sensor it may leak up to 50–100 ml oils Place a rag or container to avoid flooding the garage floor. If the oil is heavily contaminated with metal shavings, this is a sign of wear on the synchronizers or gearbox bearings.

How to check a removed speed sensor

Before installing a new sensor, make sure that the old one is truly faulty. To check, you will need a multimeter in resistance measurement mode (200 Ohm) and voltage (20 V).

Check procedure:

1. Connect the multimeter probes to the contacts 1 (signal) and 3 (mass). Resistance of a working sensor - 70–130 Ohm.

2. Check the voltage between the contacts 2 (food) and 3 (ground) with the ignition on. Must be 12 V.

3. Rotate the sensor by hand (if it has a drive). A working DS will produce voltage pulses 0.5–10 V.

If the readings do not correspond to the norm, the sensor must be replaced. On Almera Classic with a mileage of more than 150 thousand km, it is often not the sensor itself that fails, but its connector: the contacts oxidize or the wires fray.

Installing a new sensor and possible errors

Installing a new sensor is carried out in reverse order, but there are several critical nuances:

• 🔧 Tighten the fastening bolt with effort 8–10 Nm. Overtightening will lead to a crack in the plastic fitting.
• 🧴 Apply sealant on the bolt thread if the sensor is “wet” (there was an oil leak).
• 🔌 Check the connector is secure - it should click. On automatic machines, the connector often “sticks out” due to vibrations.

Typical installation errors:

Error	Consequences	How to avoid
Uncleaned connector contacts	False errors P0500, floating speed	Process contacts CRC or alcohol
Overtightened mounting bolt	Cracked fitting, oil leak from gearbox	Use a torque wrench
Installing a sensor without an O-ring	Air leaks, contact corrosion	Check the completeness of the new sensor

Frequently asked questions about the speed sensor on Nissan Almera Classic

Is it possible to drive with a faulty speed sensor?

Technically possible, but not recommended. On mechanics, this will lead to unstable idle speed and increased fuel consumption. On automatic (Almera Classic AT) The ECU will put the gearbox into emergency mode: gears will be shifted only manually, with jerks. Driving for a long time in this mode will accelerate wear of the clutches.

Which speed sensor is suitable for Almera Classic?

Original article - 39200-4M200 (for manual transmission) and 39200-4M210 (for automatic transmission). Analogues:

• Febi — 21913;
• Blue Print — ADG02103;
• Sasic — 1101010.

For Almera Classic N16 (2006–2012) suitable sensor from Renault Logan first generation (item 7701205760).

Why does the speedometer not work after replacing the sensor?

The reasons may be as follows:

1. The connector is connected incorrectly (the contacts are mixed up).
2. Broken wire from the sensor to the ECU (often frays near the exhaust manifold).
3. The speedometer itself or its drive (on the mechanics) is faulty.
4. ECU errors are not reset (you need to remove P0500 scanner).

Check the circuit with a multimeter: resistance between contacts 1 sensor and output 45 The ECU should be no more 1 ohm.

How to temporarily “deceive” the ECU if the sensor breaks down on the road?

With a manual transmission you can disconnect the sensor connector and close the contacts 1 And 3 (signal and ground) through a resistor 100 Ohm. The ECU will “see” a constant speed 20–30 km/h, which will allow you to get to the service. Automatically this method doesn't work — The checkpoint will remain in emergency mode.

What should I do if the plastic fitting breaks when removing the sensor?

The fitting is part of the gearbox housing, and its replacement requires disassembling the gearbox. Workaround:

1. Remove the remaining fittings with pliers.
2. Apply to the threads of the new sensor anaerobic sealant (For example, Loctite 577).
3. Screw the sensor firmly 10 Nm and let the sealant cure for 2-3 hours.

If the oil leak continues, contact a service center to replace the speedometer drive oil seal (it is located next to the fitting).