Why the <em>Nissan Almera Classic</em> won’t start: a complete analysis of the reasons and solutions

Nissan Almera Classic (also known as Nissan Sunny B10 in some markets) is a reliable car, but even it is not immune to starting problems. If your car refuses to start, the reasons may lie either in a banal discharged battery or in serious malfunctions of the fuel system or electronics. In this article, we will analyze all possible scenarios - from simple to complex - and also give clear instructions on how to diagnose and fix the problem yourself.

Feature Almera Classic (especially with engines GA15DE And QG15DE) - sensitivity to fuel quality and spark plug condition. For example, after refueling with low-octane gasoline (AI-92 instead of AI-95), the engine may not start due to detonation, even if there were no problems before. Another common problem is oxidation of contacts in the fuse box, which leads to loss of power to the starter or ECU.

Before taking your car to a tow truck for service, go through our checklist. In 70% of cases, the fault can be fixed on site in 10–30 minutes. And if the problem is more serious, you will at least know what to expect from the diagnosis and how much it will cost.

1. Checking the battery - where to start diagnostics

The first thing to do if Nissan Almera Classic If it won't start, check the battery. Even if everything worked fine yesterday, the battery could be discharged overnight due to:

• 🔌 Headlights or radio left on (a common reason for owners Almera with an alarm that does not turn off the power completely).
• 🌡️ Frost: at −20°C, the battery capacity drops by 30–40%, and the starter does not have enough strength to crank the crankshaft.
• 🔧 A faulty generator that does not charge the battery while driving.
• 🕒 Natural aging: the average battery life is 3–5 years.

How to check the battery without instruments:

1. Turn the ignition key to position ON (but do not start the engine). If all the lights on the dashboard are on, but you hear relay clicks when you try to start, the battery is low.
2. Turn on the high beams: if the headlights are dim or go out when you press the signal, the battery needs charging.
3. Try "lighting" from another car. If after this the car starts, the problem is definitely in the battery.

⚠️ Attention: If you hear a crackling sound or a burning smell when lighting a cigarette, immediately disconnect the wires! This is a sign of a short circuit in the on-board network, and further attempts may lead to a fire.

If the battery is discharged, but the problem persists after charging or replacing, check:

• 🔋 Leakage current (norm - no more than 50 mA). How to measure: Disconnect the negative terminal, connect a multimeter in ammeter mode between the terminal and the wire. If the readings are above 100 mA, look for a “gluttonous” consumer (the alarm or audio system is often to blame).
• 🔄 Generator: When the engine is running, the voltage on the battery should be 13.8–14.5 V. If it is less, the generator does not charge the battery.

2. Starter: clicks, but does not turn or is silent

If you hear clicks when you turn the key, but the starter does not turn the engine, the problem may be:

• 🔧 Solenoid relay (common illness Almera Classic - oxidation of contacts or breakage of the winding).
• 🔌 Poor contact between the battery and the starter (check the ground on the body and the terminals).
• ⚙️ Bendix wear or starter bushings (a grinding or squealing noise is heard).

Starter diagnostics:

1. Check whether the voltage reaches the starter: when you turn the key, you should hear a clear click of the retractor relay. If there is no click, the problem is in the control circuit (fuse, relay, ignition switch).
2. If there is a click, but the starter does not turn, try knocking on its body with a hammer (not too hard!). Sometimes this helps to “wake up” a jammed bendix.
3. Check the fuse F10 (10 A) in the block under the hood - it is responsible for the starter circuit.

Symptom	Probable Cause	Solution
Clicks, but the starter does not turn	Low battery or poor contact	Charge the battery, clean the terminals
Single click and silence	Defective solenoid relay	Replace relay or starter
The starter turns, but slowly	Worn brushes or bearings	Disassemble and clean the starter
Grinding noise on startup	Bendix wear	Replace bendix or starter

If the starter turns, but the engine does not “catch”, the problem is not in it, but in the ignition or fuel supply system. Continue to the next sections.

3. Problems with the fuel system: gasoline does not flow

If the starter turns, but the engine does not start, check the fuel supply. On Almera Classic with injector (QG15DE) common problems:

• 🛢️ Clogged fuel filter (it is recommended to change every 20,000 km, but many people forget).
• ⚡ Faulty fuel pump (when you turn on the ignition, you should hear a slight hum from the gas tank).
• 🔌 Problems with the fuel pump relay (check relay R17 in the block under the hood).
• 💧 Water in the gas tank (especially relevant after refueling at questionable gas stations).

How to check fuel supply:

1. When turning the key to position ON listen: if you cannot hear the pump operating (a slight buzzing for 2-3 seconds), check its power supply. The pump is located in the gas tank, under the rear seat.
2. Check the pressure in the fuel rail: this requires a pressure gauge and an adapter. Normal pressure is 2.5–3.0 bar. If there is no pressure, the problem is in the pump, filter or pressure regulator.
3. Disconnect the fuel line from the rail and lower it into a container. When you turn on the ignition, gasoline should come out of the hose. Be careful - gasoline is under pressure!

⚠️ Attention: If there is air in the fuel system (for example, due to a cracked hose), the engine will take a long time to “seize” or will not start at all. Check all connections for leaks.

If fuel is supplied but the engine does not start, check:

• 🔥 Spark on the candles (more on this in the next section).
• 📊 Crankshaft position sensor (if it is faulty, the ECU does not issue a command for fuel injection).

How to check a fuel pump without a pressure gauge?

If you don't have a pressure gauge, you can temporarily disconnect the return hose (going from the ramp to the gas tank) and lower it into a bottle. When you turn on the ignition, gasoline should come out of the hose under good pressure. If the stream is weak, the pump is faulty or the filter is clogged.

4. Ignition system: no spark or weak spark

If fuel is supplied but the engine does not start, the problem may be a lack of spark. On Nissan Almera Classic with engine QG15DE common faults:

• 🔥 Spark plug wear (recommended replacement interval is 30,000 km, but when driving on gas - 15,000 km).
• 📏 Breakdown of high-voltage wires (checked in the dark - if there are sparks, the wires need to be changed).
• 🔧 Ignition coil malfunction (on Almera Classic the individual coil on cylinder 1 often fails).
• 📊 Problems with the ECU (for example, after an unsuccessful “chip tuning” or a power surge).

How to check spark:

1. Unscrew the spark plug from cylinder 1, insert it into the high-voltage wire and attach it to ground (for example, to the valve cover).
2. Have a helper crank the starter. If there is no spark, the problem is in the spark plug, wire or coil.
3. Swap the high-voltage wires of the 1st and 4th cylinders. If the problem has moved to the 4th cylinder, the wire is to blame.

If there is no spark at any spark plug, check:

• 🔌 fuse F9 (15 A) — he is responsible for the ignition system.
• 📊 Crankshaft position sensor (CPS): If it is faulty, the ECU does not command sparking. Check the resistance of the sensor (the norm is 500–700 Ohms).

5. Electronics and sensors: why the ECU “shuts down” the engine

Modern Nissan Almera Classic (especially after 2006) are equipped with an electronic control unit (ECU), which can block the engine from starting if key sensors malfunction. Most often the culprits are:

• 📊 Crankshaft position sensor (CPS) - if it is faulty, the ECU does not know when to supply spark and fuel.
• 🌡️ Coolant temperature sensor (DTOZH) - if it breaks down, the ECU can flood the spark plugs with fuel.
• 🚗 Throttle Position Sensor (TPS) — if he “lies”, the engine will stall or not start.
• 🔧 Immobilizer — if the key is not recognized, the ECU blocks the start (the immo light flashes on the dashboard).

How to check sensors:

1. DPKV: measure the resistance between the terminals (the norm is 500–700 Ohms). If there is no resistance, the sensor is faulty.
2. DTOZH: when the engine is cold, the resistance should be ~3–4 kOhm, when the engine is warm - ~0.3 kOhm.
3. Immobilizer: If the immo light flashes quickly (2 times per second), the key is not recognized. Try a second key or reboot the system (disconnect the battery for 10 minutes).

If the ECU completely fails, resetting the errors may help. To do this:

1. Disconnect the negative terminal of the battery for 15–20 minutes.
2. Plug it back in and try starting the car.
3. If the problem persists, you need a diagnostic scanner (for example, ELM327) to read errors.

⚠️ Attention: On Nissan Almera Classic After disconnecting the battery, throttle adaptation may be reset. To avoid speed drift, after connecting the battery, let the engine idle for 5–10 minutes.

6. Mechanical faults: when it's not an electrical issue

If all previous checks fail, the problem may be mechanical. On Nissan Almera Classic most often found:

• 🔧 Broken timing belt - if the belt breaks, the valves may bend (on the engine QG15DE this is guaranteed overhaul).
• 🛠️ Seized camshaft or crankshaft - the starter will not be able to crank the engine.
• 💨 Compression problems — if there is no pressure in the cylinders (for example, due to a burnt-out cylinder head gasket), the engine will not start.
• 🔥 Hydraulic compensators — if they are jammed, the engine will “knock” and will not start.

How to check the mechanics:

1. Timing belt: remove the top belt cover and check its integrity. If the belt is torn or loose, replacement is required.
2. Compression: To check you need a compression gauge. Normal pressure is 12–14 bar in each cylinder. If the pressure in one cylinder is 30% lower, look for the cause (burnt valve, stuck rings).
3. Jamming: Try cranking the engine by hand (using the crankshaft pulley bolt). If it does not rotate, it is most likely jammed.

If the engine is stuck, do not try to start it with the starter - this can lead to even more serious damage. In this case, towing to a service center and engine disassembly is required.

7. External factors: why the car doesn’t start “just like that”

Sometimes Nissan Almera Classic refuses to start due to external reasons not related to breakdowns. Common scenarios:

• ❄️ Winter launch: at −25°C and below, gasoline may freeze in the fuel line (especially if there is little fuel in the tank). The solution is to add antigel or move the car to a warm garage.
• 💧 Water in the gas tank: If you refueled at a questionable gas station the day before, water could condense and block the fuel filter. The solution is to drain the gasoline and flush the tank.
• 🔑 Other people's keys: if there are keys from another car with an immobilizer nearby (for example, Nissan Primera or Toyota Corolla), they may block your key's signal.
• 🚗 After washing: If the car does not start after washing the engine, check the moisture in the fuse box and on the ignition coil. Dry with a hairdryer.

If the car does not start after a long period of inactivity (for example, after a winter in the garage), check:

• 🐭 Rodent nests — mice often chew through wires, especially in the engine compartment.
• 🔋 Oxidation of contacts — after inactivity, all connectors (especially on the ECU and starter) may oxidize. Clean them with WD-40.

FAQ: Frequently asked questions about the launch Nissan Almera Classic

The car won't start, but the starter turns. Where to start checking?

First check the fuel supply (can you hear the pump) and spark at the spark plugs. If there is fuel, but no spark, the problem is in the ignition system (coil, wires, spark plugs). If there is a spark, but the engine does not “catch”, check the compression and crankshaft sensor.

After replacing the battery, the car does not start. What's the matter?

Probably, the ECU settings have gone wrong or the immobilizer does not recognize the key. Try:

1. Disconnect the battery for 10 minutes and connect it back.
2. Use the second key.
3. Check the immobilizer fuse (F20, 10 A).

The starter clicks but does not turn. What to do?

This is a sign of a discharged battery or a faulty solenoid relay. Try:

1. "Light up" from another car.
2. Tap the starter with a hammer (sometimes it helps if the relay is stuck).
3. Check the fuse F10 (10 A) and starter relay.

The car starts and immediately stalls. What is the reason?

Most often this is:

• Faulty idle speed sensor (IAC).
• Clogged fuel filter (there is not enough fuel for constant work).
• Air leak through a cracked hose or intake manifold gasket.

Check the errors with a scanner - this will indicate a specific problem.

What kind of gasoline to pour into Nissan Almera Classicso that there are no problems with launching?

Officially recommended AI-95. If you fill AI-92, problems may appear:

• Detonation under load (knock of "fingers").
• Clogged injectors (due to additives in 92 gasoline).
• Problems with starting in cold weather (92 gasoline evaporates worse).

If you have to pour 92nd, add an octane corrector (for example, Liqui Moly).