Engine starting system in a car Nissan Almera Classic is a complex mechanism where each component plays a critical role. The central unit responsible for supplying voltage to the starter and main consumers when the key is turned is the ignition relay. It is this small electromagnetic switch that ensures the safety of the starter and the stability of the electrical circuit.
Many owners are faced with a situation where the car stops starting, and diagnostics indicate electrical problems. Often the reason lies precisely in failure ignition relay, which is located in the fuse box under the hood or in the passenger compartment. Ignoring the symptoms means that the car can stall at any time, leaving you in an uncomfortable situation.
In this article we will analyze in detail the relay device, the characteristic signs of its malfunction and a step-by-step replacement algorithm. You will learn how to distinguish a breakdown of the relay itself from problems with the ignition switch or starter, so as not to spend extra money on unnecessary repairs.
Design features and purpose of the relay on Almera Classic
Ignition relay in Nissan Almera Classic performs the function of a powerful switching device. When you insert a key into a lock and turn it, a small current from the lock flows into the relay coil, creating an electromagnetic field. This field attracts the armature and closes the high-power contacts, supplying full battery voltage to the starter and engine management system.
The use of a relay is necessary to protect the ignition switch contacts. Without this element, all the current from the battery would go directly through the plastic and thin contacts of the lock, which would lead to their rapid melting and failure. High current passes through the relay, and through the lock - only the control signal.
On Nissan Almera Classic with the 1.6L engine (QG16DE) the relay is often integrated into the common fuse and relay box under the hood. In some modifications there may be a separate control unit, but the principle of operation remains unchanged. It is important to understand that failure of this element blocks the power supply to the fuel pump and engine control unit (ECU).
⚠️ Attention: Do not try to start the engine by “bridging” the contacts on the relay if there is a malfunction, as this may cause a short circuit and fire in the wiring due to sparking in the engine compartment.
Main symptoms of a faulty ignition relay
The breakdown can be determined by a number of specific symptoms that appear when you try to start the engine. The most obvious sign is the absence of a sound from the starter when turning the key to the “Start” position. In this case, the lamps on the dashboard may go out or, conversely, continue to burn, indicating an open circuit.
Sometimes the problem manifests itself in the form of “clicks” in the area of the fuse box. If you hear a characteristic cracking sound, but the engine does not turn, it means that the relay coil is activated, but the power contacts cannot close due to carbon deposits or wear. This requires immediate verification.
Another warning sign is spontaneous engine shutdown while driving. If the motor stalls and cannot be restarted for several minutes and then starts again, the relay contacts are likely overheating and opening under load. Unstable work electrical systems are a sure sign of a dying unit.
- 🔊 Complete absence of clicks when trying to start the engine.
- 💡 Dashboard lights flash when you turn the ignition key.
- 🔥 The smell of burnt plastic or wire insulation in the area of the relay block.
- 🚫 The engine stalls while driving for no apparent reason.
Diagnostics and performance check
Before you run to the store for a new part, you need to make sure that it is the relay that is to blame, and not the battery or starter. The easiest way to check is to replace the relay with a known good one. On Nissan Almera Classic Universal relays are often used, which can be swapped with similar ones responsible, for example, for the operation of a fan or dimensions.
If you have a multimeter, you can make a more accurate diagnosis. It is necessary to remove the relay and ring its contacts. The relay body is usually marked with a diagram: the coil contacts (usually 85 and 86) must have a certain resistance, and the power contacts (30 and 87) must close when voltage is applied to the coil.
It is also worth checking the integrity of the fuses protecting the relay circuit. If the fuse is blown, simply replacing the relay will not solve the problem, since the new part may immediately burn out due to a short circuit in the wiring. Power circuit must be checked before installing a new unit.
- The starter does not turn and there is silence
- I hear a clicking sound, but the starter doesn't turn over.
- The engine starts but stalls
- No problems starting
Step-by-step instructions for replacing the relay
The process of replacing the relay with Nissan Almera Classic does not require complex tools and is available to any car owner. The fuse and relay box is usually located in the engine compartment, to the left of the engine (driver's side), when viewed from the direction of travel. Open the hood and find a plastic block with a cover.
Remove the block cover, on the inside of which there is often a diagram of the location of all the elements. Locate the ignition relay by referring to the symbols on the diagram or housing. This is usually a square or rectangular plastic block in black or gray.
Gently pull the relay housing vertically upward to remove it from the socket. Inspect the contacts on the legs: they should not be melted or oxidized. Insert the new relay until you hear a characteristic click, making sure that it is seated tightly and does not wobble.
☑️ Preparing to replace the relay
⚠️ Caution: When removing the relay, be careful not to apply excessive force to the wiring inside the socket, so as not to damage the latches or the socket itself, which will lead to poor contact in the future.
Connection diagram and pinout
Understanding the wiring diagram will help you correctly diagnose the problem. A standard relay has 4 or 5 contacts. On Nissan Almera Classic The most commonly used is a 4-pin relay. Pin 30 is the input from the battery, 87 is the output to the starter and ECU, 85 and 86 are the control coil from the ignition switch.
If you are using a universal relay, it is important to correctly determine the purpose of the legs. An incorrect connection may result in the starter running constantly without turning off after the engine starts, which will cause the bendix to break down. Always check the markings on the relay body.
| Contact number | Purpose | Connection type |
|---|---|---|
| 30 | Powered by battery | Constant plus (+) |
| 87 | Output to load | To the starter and ECU |
| 85 | Control (coil) | Minus (-) or plus (+) |
| 86 | Control (coil) | Signal from the ignition switch |
⚠️ Attention: If you change the relay to an analogue from another car, make sure that the location of the contacts matches. Different manufacturers may swap pins 85 and 86, although this is often not critical for a coil, but may be important for built-in diodes.
The influence of the ignition switch on the operation of the relay
Often the problem lies not in the relay itself, but in the ignition switch. The contacts inside the lock burn out or oxidize over time, which is why the signal to the relay coil does not reach the full extent. As a result, the relay does not operate or operates unstable.
To test this assumption, you can apply power to the relay coil directly, bypassing the lock. If the relay works clearly and the starter starts turning, then the problem is definitely in the lock. In this case, you will need to either repair the lock contacts or completely replace it.
It is also worth checking the wiring going from the lock to the relay box. Mechanical damage to the insulation or chafing of the wires at the bend can cause loss of contact. Use a multimeter in continuity mode to check the integrity of the control circuit.
Before replacing the ignition switch or relay, try gently tapping the lock housing while turning the key. If the engine suddenly starts, the problem is definitely in the wear of the contacts inside the lock, and not in the relay.
Specifics of operation and prevention
In order for the ignition relay to serve for a long time, it is important to monitor the condition of the battery. Voltage surges or deep battery discharge can negatively affect the operation of the relay coil. Also, do not allow moisture to get into the fuse box, since oxidation of contacts is one of the main causes of failure of electrical components.
Regularly inspect the engine compartment for signs of overheating. If you notice melted plastic around the relay socket, this is a sign that the contacts are overheating due to a poor connection or increased load. In this case, you not only need to replace the relay, but also clean or replace the block.
Use only high-quality original spare parts or proven analogues. Cheap relays often cannot withstand peak loads when starting the engine in cold weather, which leads to their rapid failure. For Nissan Almera Classic It is better to choose parts with a high service life.
Regularly checking the contacts and cleaning the pads prevents overheating and extends the life of the relay several times.
Owner Frequently Asked Questions (FAQ)
Where exactly is the ignition relay located on a Nissan Almera Classic?
The ignition relay is located in the main fuse and relay box under the hood. The block is located to the left of the engine (when viewed in the direction of travel), next to the battery. There is a diagram on the block cover that shows the location of all elements, including the starter and ignition relay.
Is it possible to start the engine if the relay is burned out?
In an emergency, you can close the relay's power contacts (usually pins 30 and 87) with a screwdriver or wire. This will supply power directly to the starter. However, this must be done extremely carefully, since the spark can be powerful, and the contact will not turn off automatically after starting, which is dangerous for the starter.
Why does the relay click but the starter does not turn?
If you hear a click, then the relay coil is working and attracting the armature. The problem is the power contacts inside the relay that are not closing due to carbon deposits, or the starter itself that is stuck. It is also possible that there is a bad connection in the relay socket.
What relay is on the Nissan Almera Classic?
The most commonly used is a standard 4-pin relay with a rated current of 30A or 40A. The original number may differ depending on the year of manufacture, but in terms of dimensions and circuitry this is a standard automotive relay. Often it can be replaced with a Bosch universal relay or similar.
What happens if you install a relay with the wrong contact?
If the coil contacts (85 and 86) are mixed up with the power contacts (30 and 87), the relay will not operate. If 30 and 87 are swapped, the circuit may not close or may not work correctly. In some cases, this can lead to the starter constantly turning on, which will disable it.