The situation when the car engine Nissan Almera stops starting due to lack of spark on all cylinders at once, is one of the most difficult to diagnose in the ignition system. Unlike problems with one spark plug or coil, where the engine runs erratically but starts, lack of spark at all coils means a complete failure in the control circuit or power supply to the ignition system. This often happens suddenly, leaving the driver in a difficult situation, especially if the problem arose on the road or during the cold season.
The reasons for this phenomenon can be either banal blown fuses or serious malfunctions of the electronic engine control unit (ECU). Car owners Nissan Almera new generation (G15) are often faced with design features where all coils receive control signals from one central module. If this module fails or does not receive correct data from the sensors, the spark disappears instantly.
In this article we will analyze in detail the fault finding algorithm, starting from the simplest checks and ending with the diagnosis of electronic components. You will need a basic set of tools and a multimeter to identify the source of the problem yourself. Understanding the principles of operation of the ignition system will help you save significant money on car service costs.
Primary diagnostics of the electrical circuit and fuses
The first step in solving a no-spark problem is to check the integrity of the power supply. Ignition system Nissan Almera protected by a number of fuses located in the engine compartment and in the vehicle interior. If the main fuse that supplies voltage to the coils or control unit has blown, the spark will disappear on all cylinders at once. It is necessary to carefully inspect the fusible links for rupture or melting.
Often the problem lies not in the fuse itself, but in poor contact in its holder or oxidation of the connector contacts. Even if the fuse is visually intact, it is recommended to check the voltage at the fuse output with the ignition on. Use the multimeter in constant voltage mode to ensure that the coils are receiving a stable 12 volts.
Pay attention to the ignition relay and fuel pump relay, as in some modifications Nissan Almera The ignition module power circuit is powered through the fuel pump relay. If the relay does not operate, the control unit may not send a signal to the coils, or the module itself will not have power.
Analysis of the operation of crankshaft and camshaft position sensors
Ignition system of a modern car Nissan Almera completely depends on the signals from the crankshaft position sensors (DPKV) and camshaft position sensors (DPRV). If the ECU does not receive a signal from the DPKV, it cannot determine the ignition timing and will not issue a command to open the keys in the coils. As a result, there is no spark on all spark plugs, regardless of the serviceability of the coils themselves.
The crankshaft position sensor often fails due to contamination by metal shavings that accumulate at its end, or due to damage to the winding. In some cases, the problem may not be with the sensor itself, but with the gap between the sensor and the crankshaft pulley, which may have changed due to wear or improper installation.
To check the sensor, you need to measure the resistance of its winding with a multimeter. The values should be within factory specifications, typically ranging from 500 to 1500 ohms, depending on the engine model. If the resistance is infinite (open) or zero (short), the sensor requires replacement.
- 🔍 Check the gap between the sensor and the crankshaft toothed disk, it should be within 0.5–1.5 mm.
- 🔌 Inspect the sensor connector for oxidation, moisture or mechanical damage to the contacts.
- 📉 Compare the resistance readings with the nominal values in the technical documentation.
Diagnostics of the ignition module and coils
Although it is less likely that all the coils will fail at the same time, it is this unit that is often the culprit of problems. In cars Nissan Almera an individual ignition system is used, where each spark plug has its own coil. However, if the coils are combined into a single control unit or have a common power source, the failure of one element can affect the operation of the entire system.
Checking ignition coils requires a careful approach. It is necessary to remove the connectors from each coil and check the presence of power at the contacts. If there is voltage but no spark, the problem may be in the control signals from the ECU or in the ignition modules themselves. Sometimes an interturn short circuit occurs inside the coil, which is not visually visible, but blocks operation.
It is important to check the integrity of high-voltage wires (if any) and spark plug tips. In older models Nissan Almera the wires could be frayed or oxidized, which leads to current leakage and lack of spark. On newer models where the coils fit directly onto the spark plugs, check for cracks in the coil body.
For accurate diagnostics, it is recommended to use a spark generator or ground the spark plug to the engine body while turning it with the starter. This will allow you to visually verify the presence or absence of a spark. If there is a spark, but it is weak and pink, this may indicate low voltage in the on-board network or a grounding problem.
- ⚡ Check the voltage at the power contact of each coil with the ignition on.
- 🔧 Inspect the coil body for cracks, traces of breakdown or soot.
- 🔌 Make sure that control signals from the ECU are supplied to the coils (check with an oscilloscope or test lamp).
Problems with the electronic control unit (ECU)
The most difficult and expensive option is a malfunction of the electronic engine control unit. The ECU is responsible for processing sensor signals and generating control pulses for the ignition coils. If the unit receives power but does not output a signal to the coils, the problem may be with its internal electronics or a software glitch.
A common cause of ECU failure is moisture or condensation getting into the connectors. Moisture causes a short circuit that can burn out the output transistors responsible for driving the coils. Problems can also arise due to voltage surges in the on-board network or incorrect connection of diagnostic equipment.
To check the ECU, you need to make sure that all the necessary signals are present: power, ground, signal from the crankshaft sensor. If all these conditions are met, but there is no spark, there is a high probability of a malfunction of the unit itself. In this case, professional diagnostics using specialized equipment or replacement of the ECU is required.
⚠️ Attention: Before replacing the ECU, you must make sure that the problem is not caused by external factors, such as a short circuit in the wiring or faulty sensors that could damage the control unit.
- Engine stalls at idle
- Problems starting in cold weather
- Check Engine Light Flashing
- Complete lack of response when turning the key
Diagnostic Error Code and Scanner
Modern cars Nissan Almera equipped with a self-diagnosis system that records errors in the ECU memory when malfunctions occur. Connecting an OBD-II scanner will provide an error code that will indicate a specific problem. For example, code P0351-P0354 indicates a problem with the ignition coil circuit, while P0335 indicates a problem with the crankshaft position sensor.
However, the presence of an error code does not always mean that the part is faulty. Sometimes the error can be caused by a bad connection in the connector or a temporary glitch in the system. Therefore, after reading the codes, it is necessary to carry out the visual inspection and electrical checks described in the previous sections.
If the scanner cannot connect to the ECU or does not read data, this may indicate a problem with the communication line (K-line or CAN-bus) or a complete lack of power to the control unit. In this case, the diagnosis should begin with checking the fuses and wiring going to the diagnostic connector.
| Error code | Description | Possible reason |
|---|---|---|
| P0335 | Crankshaft position sensor circuit malfunction | Broken sensor, broken wiring, contamination |
| P0340 | Camshaft Position Sensor Circuit Malfunction | Sensor malfunction, timing chain problems |
| P0351-P0354 | Ignition coil circuit malfunction | Burnt coil, broken wire, ECU malfunction |
| P0562 | Low voltage on-board network | Dead battery, faulty alternator |
☑️ Checklist for checking the ignition system
Influence of grounding and wiring quality
Often the problem of lack of spark lies in poor grounding of the ignition system. All coils and ECUs require a reliable connection to the vehicle body. If the ground point is oxidized, weakened, or burnt out, current will not be able to pass through the coil and a spark will not occur. This is especially true for used cars, where corrosion can affect the mounting bolts.
Check all major engine and body ground points. Clean them of any rust or paint, then tighten the bolts securely. Also inspect the wiring harnesses going to the coils and the ECU. Frayed insulation can lead to a short circuit to ground, which will block the operation of the system.
In some cases, the problem may be in the wiring itself, which over time loses its properties or breaks inside the insulation. Such defects are difficult to detect visually, so it is recommended to test the circuits with a multimeter, checking the resistance and the presence of breaks.
- 🔧 Find all engine grounding points and clean them to a metallic shine.
- 🔍 Inspect the wiring harnesses for signs of overheating, melting or rodents.
- 📏 Measure the resistance of the grounding circuit, it should be close to zero.
What to do if the ECU is flooded with water?
If the ECU is flooded with water, you must immediately disconnect the battery and disassemble the unit. Gently wash the board with alcohol, dry it and check for corrosion. In some cases, chip replacement is required.
Specifics of HR12DE and HR16DE engines
Cars Nissan Almera Most often equipped with HR series engines. These engines have their own characteristics in the ignition system. For example, on the engine HR12DE (1.2 liter) uses a compact coil unit that can be sensitive to overheating. On a more powerful HR16DE (1.6 liter) coils are located separately, which simplifies their replacement, but complicates wiring diagnostics.
One of the typical problems with HR engines is the failure of the camshaft position sensor due to gear wear. If the marks are misaligned, the ECU cannot synchronize the coils correctly, resulting in a lack of spark. In such cases, it is often necessary to replace the camshaft gear and reconfigure the valve timing.
It is also worth paying attention to the ignition system with direct fuel injection (if installed), where spark requirements are higher. Coil breakdown occurs faster under such conditions, and replacement should be done as a set to avoid imbalance in engine operation.
⚠️ Attention: When replacing sensors on HR series engines, use only original spare parts or high-quality analogues, since cheap sensors often have incorrect characteristics and cause false errors.
Before removing the ignition coils, be sure to mark their serial number or position so as not to be confused during installation, especially if they have different characteristics.
Final check and recovery algorithm
After completing all the checks, you need to reassemble the system and try to start the engine. If a spark appears, but the engine is running unsteadily, check the spark plugs for carbon deposits or oil. Perhaps the problem was not only in the electrical part, but also in the mechanical part of the engine.
If there is still no spark, try replacing the known-good coil or sensor with a test one. This will help localize the problem. As a last resort, the ECU may need to be replaced, but this should be the last resort after ruling out all other options.
Remember that regular diagnostics and maintenance of the ignition system will help avoid similar problems in the future. Change spark plugs and check the condition of the wiring every 30-40 thousand kilometers to ensure reliable operation of the car Nissan Almera.
A lack of spark on all coils is most often caused by a faulty crankshaft sensor, problems with the ECU power supply, or poor grounding, and not by the simultaneous failure of all coils.
Frequently Asked Questions
Why did the spark disappear on all coils at the same time?
This usually indicates a problem in a common element of the system: lack of power to the coils, a faulty crankshaft position sensor, ECU failure, or an open circuit in the overall control circuit.
Can a bad battery cause no spark?
Yes, if the battery voltage drops below a critical level, the ECU may not have enough power to generate a spark, although the starter may still be turning the engine.
How to check the crankshaft sensor without a scanner?
It is necessary to measure the resistance of the sensor winding with a multimeter. If the resistance is normal, check for the presence of alternating voltage at the terminals when cranking the starter.
What to do if the ECU does not send a signal to the coils?
Check for power and ground on the ECU itself. If there is power but no signal, the output transistors inside the unit may be damaged and require repair or replacement.
Do I need to change all the coils if one burns out?
It is recommended to change all coils at the same time, since they have the same mileage and operating conditions. If one fails, the others may soon follow suit.