Nissan Almera N16 will not start: a complete analysis of the reasons and solutions

Nissan Almera N16 (2000-2006) is a reliable sedan, but even it is not immune to starting problems. If your car refuses to start, the reasons may lie either in a simple discharged battery or in serious malfunctions of the fuel system or electronics. In this article we will look at all possible reasonswhy Almera N16 does not respond to the key or starts and immediately stalls, and we will also give step by step instructions for diagnosing and troubleshooting.

A special feature of this model is its sensitivity to the quality of fuel and electronics. For example, The Nats immobilizer often blocks starting due to a failure in the key chip or antenna, and the fuel pump may fail after refueling with low-quality gasoline. We will not limit ourselves to general advice, but will give specific recommendations taking into account the design Almera N16 (engines QG15DE, QG16DE, QG18DE).

1. Battery: first check when starting failure

Let's start with the most obvious - battery. B Nissan Almera N16 Even a weak battery charge can cause the starter to turn slowly or not respond at all. This is especially true in the cold season, when the battery capacity drops by 30–40%.

How to check:

• 🔋 Terminal voltage: must be at least 12.6 V (with the ignition off). If less 12.2 V - the battery is low.
• 🔌 Oxidation of contacts: White coating on the terminals increases resistance. Clean with sandpaper and lubricate Lithol.
• 🚗 Test under load: when trying to start, the voltage should not drop below 10 V. If it falls, the battery is faulty.

If the battery is discharged, but after “lighting up” or charging the car starts, the problem is in the generator or current leakage. B Almera N16 often fails generator relay regulator (article 23100-4M000), which leads to undercharging.

⚠️ Attention: If after replacing the battery the car starts, but after a day or two it refuses again - check leakage current. Norm for Almera N16 - up to 50 mA. An excess indicates a short circuit in the wiring or faulty equipment (for example, an alarm system).

2. Starter: why does it click but doesn’t turn?

If you hear when you turn the key single clicks or series of frequent clicks, but the starter does not rotate the engine - the problem is in it or in its power supply circuit. B Almera N16 starter (23300-4M000) often fails due to:

• 🔧 Bendix wear - does not engage with the flywheel.
• 🔥 Burnt contacts of the solenoid relay — The starter clicks, but does not turn.
• 🛢️ Thickened grease — in winter the starter can “stick”.

Diagnostics:

1. Check starter fuse (F30, 10A in the block under the hood).
2. Tap the starter housing with a hammer (not too hard!) - if after that it starts working, the problem is burnt contacts.
3. Check the voltage at solenoid relay terminal when turning the key. Must be 12 V.

Symptom	Probable Cause	Solution
Single click, starter does not turn	Defective solenoid relay or battery	Check the battery, replace the relay or starter
The starter turns but does not engage	Worn bendix or flywheel crown	Replacing the bendix or flywheel
Starter works intermittently	Contact oxidation or brush wear	Contact cleaning, starter repair

If the starter turns, but the engine does not start, the problem is fuel system or ignition. More about this in the following sections.

Check fuse F30 (10A)

Make sure there is 12V coming to the solenoid relay

Tap the starter housing (lightly!)

Check the ground on the body near the starter

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3. NATS immobilizer: why the car doesn’t see the key

Nissan Almera N16 equipped with a system NATS (Nissan Anti-Theft System), which often causes startup failure. If the dashboard flashes red key — the immobilizer does not recognize the chip in the key or there is a failure in the system.

Reasons:

• 🔑 Dead battery in the key (if the key has buttons).
• 📡 Immobilizer antenna malfunction (located around the ignition switch).
• 💻 Failure in the NATS control unit (reflashing required).
• 🔧 Damage to the chip in the key (often after falling or getting wet).

How to bypass the immobilizer temporarily:

1. Try it second key — if it starts, the problem is in the first place.
2. Check NATS fuse (F10, 10A in the cabin block).
3. Disconnect the battery for 10 minutes - sometimes the error resets.

⚠️ Attention: If after replacing the battery or removing the terminals Almera N16 stopped starting - required retraining keys via a diagnostic scanner (for example, Consult-III). You can't do this on your own!

How to check the immobilizer antenna?

The NATS antenna in the Almera N16 is a coil around the ignition switch. To check its functionality:

1. Remove the plastic trim of the steering column.

2. Check the integrity of the antenna wires (often chafed or oxidized).

3. Measure the coil resistance - it should be ~500 Ohms.

If the antenna is faulty, the immobilizer will not be able to read the signal from the key and the car will not start.

4. Fuel system: why the engine does not catch

If the starter turns, but the engine Almera N16 does not start or stalls immediately after starting - the problem is fuel system. The most vulnerable nodes:

• ⛽ Gasoline pump - often fails after refueling with bad fuel.
• 🔧 Fuel filter - clogs after 30–40 thousand km.
• 🛢️ Injectors - become clogged due to low quality gasoline.
• 📉 Fuel pressure regulator — may “stick” in the open position.

Diagnostics:

1. Check Can you hear the sound of the fuel pump? when the ignition is turned on (in the rear of the cabin). If not, the pump is faulty or there is no power.
2. Measure fuel rail pressure:
   • Norm for QG16DE: 3.0–3.5 bar.
   • If the pressure is lower 2.5 bar - the problem is in the pump or filter.

Check fuel pump fuse (F15, 15A) and relay (in the block under the hood).

If the fuel pump works, but no fuel flows, check fuel lines for kinks or cracks. B Almera N16 The tube under the bottom of the rear wheel often wears out.

5. Ignition system: spark plugs, coils, wires

If the engine Almera N16 the starter spins, but does not engage - check ignition system. Most likely problems:

• ⚡ Spark plug wear — recommended replacement interval: 30,000 km.
• 🔌 Breakdown of high-voltage wires - check in the dark (sparks will be visible).
• 🛠️ Ignition coil malfunction - often fails on engines QG18DE.
• 📡 Malfunction in the ignition control unit - requires diagnostics with a scanner.

How to check:

1. Unscrew candles and inspect them:
   • Black carbon is a rich mixture or oil in the combustion chamber.
   • White soot is a poor mixture.
   • Cracks on the insulator - the spark plug is broken.
2. Check spark:
   • Remove the high-voltage wire and insert a known-good spark plug into it.
   • Place the spark plug on the ground and crank the starter. If there is no spark, the problem is in the coil or wires.

B Almera N16 often fails ignition module (article 22448-4M000). If the engine stalls or does not start when hot, check it first.

6. Electronics and sensors: hidden reasons

If all of the above is ok, but Almera N16 stubbornly won't start - the problem may lie in electronics. The most problematic sensors:

• 🌡️ Crankshaft position sensor (CPS) - if faulty, the engine will not start.
• 🌡️ Coolant temperature sensor - affects the composition of the mixture.
• 🛢️ Mass air flow sensor (MAF) - If there is a malfunction, the engine may not start.
• 🔧 Throttle Position Sensor (TPS) — often fails at mileage >100 thousand km.

Diagnostics:

1. Check error codes via diagnostic connector (OBD-II). For Almera N16 any scanner that supports the protocol will do ISO 9141-2.
2. Measure the resistance of the sensors:
   • DPKV: 500–700 Ohm.
   • Temperature sensor: 2–6 kOhm (depends on temperature).

Check power supply to sensors - must be 5 V or 12 V (depending on type).

If the scanner shows an error P0335 (DPKV malfunction) - the sensor must be replaced. B Almera N16 it is located on the oil pump cover (bottom of the engine, 近 flywheel).

⚠️ Attention: If after washing the engine or rain the car stops starting, check tightness of sensor connectors. B Almera N16 The contacts of the mass air flow sensor and the air pressure sensor are often oxidized.

7. Mechanical faults: timing belt, compression

If the engine Almera N16 does not start, but the starter turns easily (without resistance), and the exhaust pipe smells of gasoline - check mechanical part:

• 🔗 Broken timing belt - engines QG15DE/QG16DE/QG18DE valve bend at the break!
• 🛠️ Low compression - if below 10 bar in one or more cylinders.
• 🔧 Camshaft failure - rare, but happens on long runs.

How to check:

1. Remove timing belt cover and inspect it for cracks or breaks.
2. Measure compression:
   • Norm for QG16DE: 12–14 bar.
   • The spread between cylinders should not exceed 1 bar.

Check timing marks - if shot down, the engine will not start.

If the timing belt breaks - don't try to start the car! B Almera N16 this is guaranteed to lead to bent valves and expensive repairs.

8. Additional reasons: from alarms to USSR

Sometimes Almera N16 won't start for unknown reasons:

• 🚨 Alarm - may block starting due to a malfunction in the central locking or shock sensor.
• 🔋 Discharged alarm key fob - some models block the immobilizer.
• 🛠️ Malfunction of the electric power steering (EGUR) - rare, but may affect startup.
• 🔌 Bulk Wire Oxidation — check the contact on the body near the battery.

If the car does not start after installing new equipment (radio, alarm), check correct connection. B Almera N16 wires are often mixed up IGN1 And IGN2, which leads to startup blocking.

FAQ: Frequently asked questions about launching Nissan Almera N16

The car does not start, the starter does not turn, but the dashboard is on. What's the matter?

Most likely the problem is starter or its power circuit. Check:

• fuse F30 (10A).
• The starter relay is in the block under the hood.
• Contacts on the solenoid relay (often oxidize).
• Ground on the body (wire from the battery to the body).

If you hear a click when you turn the key, but the starter does not turn, it is faulty solenoid relay.

The engine starts, but immediately stalls. What to do?

Reasons:

• NATS immobilizer faulty (red key flashes).
• Injectors clogged or low fuel pressure.
• DMRV does not work - The engine starts, but immediately stalls.
• Air leak through cracks in the manifold or gaskets.

Check fuel rail pressure And error codes scanner.

After replacing the battery, the car does not start. Why?

Probable reasons:

• NATS immobilizer settings have been reset — key retraining is required.
• The terminals are oxidized when installing a new battery.
• The "zero" sensor has fallen off (for example, DPKV) - you need to reset the errors using the scanner.

If the red key is on, you cannot do without diagnostic equipment.

The car starts only with a pusher. What's the problem?

This indicates:

• Faulty crankshaft position sensor (CPS).
• Problems with the fuel pump (does not create the required pressure at idle).
• Failure in the engine control unit (ECU).

Check timing marks - if shot down, the engine will only be started from the tug.

How to check if the fuel pump is working in Almera N16?

Verification methods:

1. When you turn on the ignition you should hear buzzing sound from under the rear seat (the pump is running).
2. Check fuse F15 (15A) And fuel pump relay.
3. Measure fuel rail pressure (norm: 3.0–3.5 bar).
4. Remove the hose from the ramp - when you turn on the ignition, fuel should flow.

If the pump does not pump, check pump weight (attached to the body under the rear seat).