The situation when the engine stops starting due to lack of spark is one of the most common problems in cars. Nissan Almera Classic. This model, based on the Renault Symbol, is equipped with a reliable 16-valve engine, but it is also susceptible to certain types of faults in the ignition system. When you turn the key in the lock, the starter turns the engine, but there is no starting, and you only hear the empty sound of the fuel pump.
The lack of a spark can be caused by many factors: from banal oxidation of contacts to failure of critical electronic components. Owners Nissan Almera Classic Often you have to deal with problems with the ignition module or crankshaft position sensors, which are the “heart” of the engine management system. Correct diagnostics allows you to avoid unnecessary expenses on replacing faulty parts.
In this article we will analyze in detail the fault finding algorithm, paying special attention to the specifics of the electrical circuit of this particular model. We will look at what tools are needed for checking and how to distinguish a trivial breakdown from a complex failure in the electronic control unit. You can carry out initial diagnostics yourself without contacting an expensive service.
Primary diagnostics of the ignition system and power check
The first step when detecting an engine starting problem is a visual inspection and basic measurements. You need to make sure that the battery has sufficient charge, as low voltage can interfere with the operation of the ignition coils and electronic control unit (ECU). Even if the starter cranks the engine, the voltage may drop to critical values at which the ignition module does not generate high voltage.
Check the fuses that control the ignition system and fuel pump. IN Nissan Almera Classic Often the EFI or IGN fuse located in the block under the hood fails. If the fuses are good, proceed to checking the relay. The fuel pump relay and ignition relay should make a characteristic click when the ignition is turned on.
It is important to check for voltage on the ignition module itself. This is a critical step that newbies often miss. The lack of power at the module connector will immediately indicate a problem in the wiring or in the relay block.
- 🔍 Use a multimeter to check the voltage at the battery terminals (normal 12.6V and above).
- ⚡ Inspect the fuse box for blown fuses.
- 🔧 Check the relay clicks when you turn on the ignition by touching them with your finger.
⚠️ Attention: Do not try to check for a spark by unscrewing a spark plug and applying it to ground if you do not know how to do this correctly on fuel-injected cars. This may cause the ECU to fail due to a high voltage short circuit.
Analysis of the operation of the ignition module and coils
On the engine Nissan Almera Classic (engine code QG16DE) an ignition system with two coils combined into one module is installed. Each coil is responsible for two cylinders operating simultaneously (Waste Spark system). If there is no spark on all the spark plugs, the problem most likely lies in the module itself or in its control.
Ignition module Nissan Almera Classic is the most vulnerable node. It is located directly on the valve cover and is exposed to high temperatures and vibrations. Over time, the insulation inside the coils deteriorates, or the power transistors inside the module fail. This may not appear visually, but when checked with a multimeter, a break in the primary or secondary winding is detected.
To check, you need to remove the connector from the module and ring the windings. The resistance of the primary winding should be in the range of 0.4–0.6 Ohms, and the secondary winding should be about 9–12 kOhms. If the indicators fall outside these limits, the module requires replacement. It is also worth checking the integrity of high-voltage wires if they are used, although spark plugs with integrated tips are often used on this model.
- 🛠️ Remove the ignition module and visually inspect it for cracks or signs of breakdown.
- 📏 Measure the resistance of the coil windings using an ohmmeter.
- 🔌 Clean the contacts of the module connector from oxidation and apply dielectric grease.
- No power supply to the module
- The module itself burned out
- Problem with sensors
- Other
The role of crankshaft and camshaft position sensors
The electronic engine control unit cannot generate a spark if it does not see the position of the pistons. For this, crankshaft position sensors (DPKV) and camshaft position sensors (DPRV) are used. On Nissan Almera Classic DPKV malfunction is one of the most common causes of complete loss of spark. If the sensor does not transmit a signal, the ECU simply does not understand when to give a spark.
The crankshaft sensor is located on the clutch housing and is very vulnerable to contamination. Metal shavings, dirt or oil can coat the sensor element, distorting the signal. Often it is enough to simply clean the sensor of deposits for the system to work. However, if the sensor has an internal coil break, it will need to be replaced.
Checking the DPKV is carried out with a multimeter in resistance measurement mode. The nominal resistance for this sensor is usually between 500 and 1000 ohms. It is also important to check the gap between the sensor and the flywheel ring gear. If the gap is too large or the sensor has moved, there will be no signal.
- 🧹 Carefully clean the tip of the crankshaft sensor from dirt and metal dust.
- 📐 Check the resistance of the DPKV sensor (should be around 500-1000 Ohms).
- 🔩 Make sure the sensor is in the correct position and there are no gaps.
⚠️ Attention: Even minimal damage to the crankshaft sensor wire insulation can lead to loss of spark when the engine heats up. The wire must be intact along the entire length to the connector.
Operation and diagnostics of the electronic control unit
Sometimes the reason for the lack of a spark lies in the very “brain” of the car - the electronic control unit (ECU). This happens less frequently than an ignition module failure, but it is possible. IN Nissan Almera Classic The ECU often suffers from power supply problems or from moisture getting inside the housing.
If all external components are in good condition, power is supplied to the module, the sensors produce signals, but there is no spark, it is worth checking the control unit. Often the problem is oxidation of the contacts in the ECU connector or a malfunction of the ignition relay inside the unit itself. It is also possible that the traces on the board may be damaged due to overheating or power surges.
For in-depth diagnostics, you will need a diagnostic scanner that can read error codes and check whether the ECU sees signals from the sensors. If the scanner connects, but does not see the engine or produces critical errors in the ignition control circuits, this is a reason to contact professionals to repair the ECU board.
☑️ ECU checklist
Wiring and grounding problems
An electrical circuit must be closed for current to flow. Used cars often have problems with ground (grounding). If the negative wire of the ignition module or ECU is oxidized or rotted, the spark will disappear, even if all parts are in good condition. This is a classic problem that is easily missed by a superficial diagnosis.
Carefully inspect the wiring harnesses leading to the ignition module and sensors. On Nissan Almera Classic Due to vibration, the wires can rub against the body or engine, causing a short circuit or break. Pay special attention to where the wire passes through the partition into the passenger compartment and areas near moving engine parts.
Check the main grounding points. Often the engine "ground" is attached to the body or gearbox with a bolt that rusts over time. Cleaning and retightening these contacts will often solve the problem without replacing any expensive parts. Use stripped contacts and copper grease to prevent future oxidation.
- 🔩 Find the main engine ground bolts and tighten them.
- 🧵 Inspect the wiring harnesses for chafing insulation.
- 🔦 Check the integrity of the contacts in the connectors for oxidation.
What to do if the wire is frayed?
If you find a frayed wire, do not try to simply cover it with electrical tape. It is necessary to clean the damaged area, twist the wires and solder them, and then insulate them with heat shrink tubing.
Comparison table of faults and probable causes
For ease of diagnosis, we have collected the main symptoms and their corresponding causes in one table. This will help you quickly navigate the problem without wasting time on unnecessary checks. Please note that some symptoms may overlap, so a comprehensive approach is always preferable.
| Symptom | Probable Cause | Difficulty of repair |
|---|---|---|
| The starter turns, but there is no spark | Ignition module is faulty | Average |
| No spark, fuel pump not working | Relay or fuse problem | Low |
| No spark, crankshaft sensor error | Broken or dirty DPKV | Low |
| There is a spark, but there is no start | Fuel delivery or compression problem | High |
| The spark only disappears when it's hot. | Crack in the coil or oxidation of contacts | Average |
Before purchasing a new ignition module, be sure to check for error codes with a scanner. Sometimes the problem is solved by flashing the ECU, which is cheaper than replacing the module.
Step-by-step instructions for replacing the ignition module
If diagnostics show that the ignition module is faulty, it must be replaced. The process does not require special skills, but requires accuracy. On Nissan Almera Classic The module is mounted directly on the engine valve cover, making it easily accessible.
First you need to disconnect the negative terminal of the battery for safety. Then disconnect the wire connectors from the module. Unscrew the three bolts securing the module and carefully remove it. When installing a new module, make sure that the gasket (if included) is installed correctly to prevent oil from getting inside.
After installing the new module, connect the connectors and connect the battery terminal. Start the engine and check idle speed. If everything is done correctly, the engine should start and run smoothly. Do not forget to erase error codes if they were recorded in the ECU memory.
- 🔑 Disconnect the battery before starting work.
- 🔧 Remove the connectors and unscrew the module mounting bolts.
- ⚙️ Install the new module, maintaining tightness.
Replacing the ignition module is the most effective way to restore spark if the sensors and wiring are good.
FAQ: Frequently asked questions
Can the spark fail due to bad fuel?
Bad fuel itself will not cut off the spark, but it can clog the injectors or cause detonation, causing the engine to stall. However, if the engine stalls and does not start, the reason is most often electrical, and not the quality of gasoline.
What to do if there is no spark on one cylinder?
If there is spark on two cylinders but not on one, the problem is most likely in the high voltage wire or a specific coil inside the module. On Nissan Almera Classic the module has two coils, and if one of them burns out, the spark will be lost on two cylinders at the same time.
How to check DPKV without a multimeter?
It is difficult to check the sensor without a multimeter, but you can try to visually inspect it for damage. You can also temporarily replace the sensor with a known good one, if possible. If the engine starts to start, it means the old sensor is faulty.
Why does the spark disappear only after the engine warms up?
This is a classic sign of a bad ignition coil or module. When heated, materials expand, and cracks in the insulation can complete or break a circuit. It is thermal expansion that often leads to loss of spark on a hot Nissan Almera Classic engine.
Is it possible to drive if the spark disappears periodically?
It is absolutely forbidden to drive with a missing spark. This can lead to catalytic converter failure due to unburned fuel entering the exhaust system. In addition, unstable engine operation can cause the engine to stall in a dangerous situation.