Fuel pump relay <em>Nissan Almera N16</em>: how to find, diagnose and replace

Nissan Almera N16 is a popular sedan, but even it has problems with the fuel system over time. One of the most insidious malfunctions is related to fuel pump relay, which can fail for no apparent reason. The car suddenly stalls, won't start, or runs rough—all of these could indicate problems with the relay. In this article we will look at where the fuel pump relay is located on Almera N16, how to check and replace it without contacting service.

Feature N16 The problem is that the fuel pump relay is not always located in an obvious place. Depending on the year of manufacture and configuration, it may be located in different blocks. We have collected all the relevant information, including layout diagrams, signs of malfunction and step-by-step replacement instructions. You will also learn how to distinguish a relay failure from problems with the fuel pump itself or the fuse.

Where is the fuel pump relay located? Nissan Almera N16?

B Almera N16 The fuel pump relay can be located in two places - it all depends on the modification and year of manufacture of the car. On most models (2000–2006) it is in relay and fuse box under the hood, but sometimes occurs in the salon.

Exact coordinates:

• 🔧 Main location — fuse box in the engine compartment (next to the battery). The fuel pump relay is usually labeled as Fuel Pump Relay or is marked K20.
• 🚗 Alternative location — the unit is in the cabin, under the instrument panel on the driver’s side. Here the relay can be signed as ECCS Relay (on some versions with injection system ECCS).
• 🔍 How to distinguish - fuel pump relay N16 usually black or dark gray, with 4 contacts. There is often a 15A fuse nearby (marked Fuel Pump).

To avoid confusion, use the layout diagram:

Model/year	Relay location	Marking	Number in block
Almera N16 2000–2003	Block under the hood	Fuel Pump Relay	K20 or 20
Almera N16 2004–2006	Block in the cabin (left end of the panel)	ECCS Relay	K15 or 15
Almera N16 with GA16DE	Block under the hood	Fuel Pump	K22

If you're not sure where exactly to look, check both blocks. There is usually a diagram on the fuse box cover with symbols. If there is no diagram, take a photo of the block and check the manual or online catalogs (for example, Elcats).

Signs of a faulty fuel pump relay

Fuel pump relay Nissan Almera N16 rarely fails suddenly - there are usually "symptoms" that help diagnose the problem in advance. Here are the key signs:

• 🚨 The car won't start, but the starter turns. At the same time, there is no characteristic buzzing of the fuel pump when the ignition is turned on.
• ⚡ The engine stalls while driving and does not start until the relay “rests” (typical of burnt contacts).
• 🔥 Jerks when moving, especially at high speeds - fuel is supplied unevenly due to unstable operation of the relay.
• 🔋 Clicking sounds from the fuse box when you try to start the car - a sign that the relay is trying to work, but the contacts do not close.

It is important to distinguish a relay failure from problems with the fuel pump itself or the fuse. For example, if when you turn on the ignition I can't hear the pump running, check:

1. fuse Fuel Pump (usually 15A).
2. Voltage at the fuel pump connector (should be 12V when the ignition is on).
3. The relay itself can be temporarily replaced with a known working one (for example, from a cooling fan).

How to check the fuel pump relay Almera N16?

Checking the fuel pump relay does not require special tools - just a multimeter or even a regular 12V light bulb is enough. Here are the step-by-step instructions:

Method 1: Hearing test and replacement

• 🔊 When you turn on the ignition (ON, but not START) you should hear a click from the relay and a short hum from the fuel pump. If there is no click, the relay does not operate.
• 🔄 Temporarily swap the fuel pump relay with another (for example, a fan or headlight relay). If the car starts, the problem is in the relay.

Method 2: Check with a multimeter

1. Remove the relay from the block (by carefully prying it with a screwdriver).
2. Switch the multimeter to resistance testing mode (ohmmeter) and connect the probes to the contacts 85 And 86 (relay coil). Resistance must be within 50–120 Ohm.
3. Apply 12V to the contacts 85 And 86 (possible from battery). You should hear a click, which means the coil is working properly.
4. Check the resistance between 30 And 87 (power circuit contacts). In the open state - infinity, in the closed state (when 12V is supplied) - 0 ohm.

If the relay does not click or the resistance is not normal, it needs to be replaced. Also note contact status in the block: oxidation or scorching can cause similar symptoms.

Step-by-step replacement of the fuel pump relay

Replacing the relay with Nissan Almera N16 takes no more than 5 minutes, but there are some nuances. You will need:

• 🔧 New relay (original number - 25230-3M000 or analogues Bosch, Hella).
• 🔦 Flashlight (if the unit is in the cabin).
• 🧲 Tweezers or thin screwdriver for removing the relay.

Instructions:

1. Turn off the ignition and remove the negative terminal from the battery (required!).
2. Locate the fuse box (under the hood or in the passenger compartment) and remove the cover.
3. Find the fuel pump relay (see table above) and carefully remove it by prying it by the edge.
4. Install the new relay, making sure it is seated all the way.
5. Replace the unit cover and connect the battery.
6. Check operation: when you turn on the ignition, you should hear a clicking and buzzing sound from the pump.

If the car does not start after replacing the relay, check:

• 🔌 Fuse Fuel Pump (may burn out if short circuited).
• 🔌 Voltage at the fuel pump connector (should be 12V when the ignition is on).
• 🔧 Condition of the fuel pump mass wire (often oxidizes under the rear seat).

What to do if the new relay does not work?

Check the relay power supply circuit (fuse, wires). Often the problem lies in a broken wire from the ECU to the relay or in a malfunction of the control unit itself.

Frequent mistakes during diagnostics and repairs

Many owners Almera N16 make typical mistakes that lead to unnecessary expenses or aggravation of the problem. That's what can't do:

⚠️ Attention: Never check the serviceability of the relay “for spark” by supplying 12V directly from the battery. This may burn the relay coil or damage the ECU.

• 🔥 Ignore fuse - if the relay burns out, there is a high chance that the fuse also burned out. Always check both elements.
• 🔧 Install a relay from a different model - even if it looks similar, the parameters may differ. For example, a relay from Nissan Primera P12 not always suitable for N16.
• 🔋 Do not check the fuel pump ground - often the problem lies in the oxidized contact under the rear seat, and not in the relay.
• 🚗 Driving with a stuck relay - this can lead to overheating of the fuel pump and its failure.

Another common mistake is buying cheap analogues. Relays from unknown brands often have unreliable contacts that burn out after 1–2 months. It’s better to overpay for the original or proven brands (Bosch, Hella, Valeo).

The cost of the relay and where to buy it?

Fuel pump relay price for Nissan Almera N16 depends on the type and manufacturer:

Relay type	Manufacturer	Article	Price, rub.
Original	Nissan	25230-3M000	800–1 200
Analogue premium	Bosch	0 332 014 150	400–600
Analogue standard	Hella	4RA 003 507-331	300–450
Budget analogue	ERA	550366	150–250

Where to buy:

• 🛒 Official dealers Nissan - guarantee of originality, but high price.
• 🌍 Online stores (Exist.ru, Autodoc, Kolesa-darom) - a wide choice, but there is a risk of running into a fake.
• 🏬 Car disassembly - you can find a used relay for 100–200 rubles, but without a guarantee.
• 🔧 Electronics stores (For example, Chip and Dip) - sometimes they sell universal relays suitable for N16.

Important: On Almera N16 with engine QR20DE (restyled versions) a different type of relay can be installed - 25230-4M000. Check the article before purchasing!

FAQ: Frequently asked questions about the fuel pump relay Nissan Almera N16

Is it possible to drive with a faulty fuel pump relay?

No, it's dangerous. If the relay jams, the fuel pump can work continuously, which will lead to its overheating and failure. In addition, the car can stall at any time, for example, at an intersection.

How to distinguish a relay failure from a fuel pump failure?

If the relay is working properly, when you turn on the ignition, you will hear a click and a short hum of the pump. If there is no click, the problem is in the relay or its circuit. If there is a click, but you cannot hear the pump, check the pump itself or its fuse.

What should I do if, after replacing the relay, the car still does not start?

Check:

• fuse Fuel Pump (may burn out when replacing the relay).
• Voltage at the fuel pump connector (should be 12V).
• Ground wire of the fuel pump (often oxidizes under the rear seat).
• Circuit from ECU to relay (wire blue-yellow).

Is it possible to repair the fuel pump relay?

Theoretically, you can disassemble the relay and clean the contacts, but this is a temporary solution. The contacts in the relay are covered with a special layer, which wears off over time, and the reliability of the restored relay will be low. It's better to replace it with a new one.

Which relay can be used instead of the original one?

Suitable relays from Bosch 0 332 014 150, Hella 4RA 003 507-331 or Valeo 404001. The main thing is that it is 12V with a similar contact group (4 contacts, normally open).