<em>Nissan Avenir</em>fuel pump relay: diagnostics, malfunctions and do-it-yourself replacement

Nissan Avenir is a reliable Japanese minivan, 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 without preliminary “symptoms”. As a result, the car either refuses to start or stalls while driving, leaving the driver at a loss. In this article we will look at how to independently diagnose the problem where the relay is located on Avenir (depending on the year of manufacture), and how to replace it without contacting service.

Feature Nissan Avenir (especially models W10 And W11) is that the fuel pump relay is often confused with the fuse or the pump itself. Meanwhile, checking it takes only 10 minutes, and replacing it takes even less. We have collected all the necessary information: from a fuse box diagram to step-by-step instructions with photos, so that you can cope with the problem even without car repair experience.

Where is the fuel pump relay located? Nissan Avenir?

The location of the relay depends on the generation of the minivan. In most cases it is set to fuse box under the hood, but on some modifications (for example, Avenir W10 with engine SR20DE) may be located in the cabin. To avoid wasting time searching, use our table:

Generation Nissan Avenir	Year of manufacture	Fuel pump relay location	Number in block
Avenir W10	1990–1997	Fuse box under hood (driver's side)	#17 or #23
Avenir W11	1997–2005	Unit in the cabin (under the instrument panel, to the left of the steering wheel)	#15
Avenir Salut (restyling)	2002–2005	Additional block behind the glove compartment	#8

There is usually a diagram with symbols on the fuse box cover, but the inscriptions are often erased. If you are not sure which relay is responsible for the fuel pump, refer to wire color: on Avenir this is usually black with yellow stripe (power supply +12V) or gray (control signal from the ECU).

To get to the unit in the cabin, you will need:

• 🔧 Unscrew the two screws securing the bottom panel under the steering wheel (Phillips screwdriver).
• 🔍 Snap off the plastic clips (carefully, they are fragile!).
• 📍 Find the fuse box - it is located to the left of the pedal assembly.

Signs of a faulty fuel pump relay

Fuel pump relay Nissan Avenir rarely fails suddenly - it is usually preceded by indirect signs. If you ignore them, you can wait until the car stalls on the highway and won’t start. Pay attention to the following symptoms:

• ⚡ The engine starts only after several attempts (you have to turn the starter for a long time).
• 🔊 When you turn the key, you can’t hear the characteristic buzzing of the fuel pump (from under the rear seat).
• ⛽ The car stalls while driving, especially when accelerating sharply or when it’s hot.
• 🚗 Lights up on the instrument panel CHECK ENGINE (the error may indicate low pressure in the fuel system).

It is important to distinguish a relay malfunction from problems with the fuel pump itself or the fuse. For example, if the pump hums but doesn't pump fuel, most likely he himself is to blame. And if when you turn on the ignition there's not even a click from the relay - the problem is in it or in the power supply circuit.

⚠️ Attention! If the car stalls while driving and does not start, do not try to tow it “on a tie” - this may damage the transmission. It's better to call a tow truck or try to replace the relay on site (if you have a spare one).

How to check the fuel pump relay Nissan Avenir?

Relay diagnostics take no more than 5 minutes and do not require special tools. You only need multimeter (or control lamp) and a screwdriver. Follow the step by step instructions:

1. Remove the fuel pump relay from the block (remember its location!).

2. Check fuse integrity (usually this is 15A or 20A, located next to the relay). If it burns out, the problem may be a short circuit.

3. Take your multimeter and put it in resistance test mode (200 Ohm). Connect the probes to the contacts 85 And 86 relay (marked on the body). Resistance must be within 50–120 Ohm. If the device shows 0 or ∞ - the relay is faulty.

4. Serve +12V to contacts 85 And 87 (you can use a battery and two wires). If the relay is working properly, you will hear a characteristic click.

If the relay clicks but the fuel pump does not work, check:

• 🔌 Power on pin 87 (should be +12V when the ignition is on).
• 🔌 Ground on pin 86 (must be “zero” relative to the body).
• 🔌 Signal from the ECU on pin 85 (when you turn on the ignition, +12V should appear for 1–2 seconds).

If all checks were successful, but the pump does not work, the problem may be wiring (open or short circuit) or in the fuel pump itself. On Avenir The contacts in the pump connector (under the rear seat) often oxidize, so inspect them too.

Step-by-step replacement of the fuel pump relay

If the diagnostics confirm that the relay is faulty, it must be replaced. On Nissan Avenir this is done literally in 2 minutes, but there are several nuances:

1. Buy a new relay. Original article for Avenir W10/W11 — 25230-31U00 or 25230-31U05. Analogues from Denso, Bosch or Hella (the main thing is that the contacts and load current match).

2. Disable negative battery terminal (this is mandatory to avoid short circuit!).

3. Remove the old relay from the block (pull it up, sometimes you need to pry it off with a screwdriver).

4. Install a new relay exactly in the same position (It’s easy to mix up the contacts, but this will lead to a short circuit!).

5. Connect the battery and check the operation of the fuel pump (when you turn on the ignition, you should hear the relay click and the pump hum).

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

• 🔋 Battery charge (voltage must be at least 12.4V).
• 🔌 Fuel pump fuse (may burn out if short circuited).
• 🛠️ State of contacts in the block (oxidation or burning).

What if the new relay doesn't work either?

If after replacing the relay the fuel pump does not turn on, the problem may be:

1. **ECU** (does not send a signal to the relay).

2. **Wiring** (break or short circuit between the relay and the pump).

3. **On the fuel pump itself** (wear of brushes or motor).

4. **Fuel pressure sensor** (on models with SR20DE it may block the pump).

In this case, deeper diagnostics using a scanner will be required (for example, Launch X431) or checking the circuit with a multimeter.

⚠️ Attention! On Nissan Avenir W11 with the system Nissan Direct Ignition System (NDIS) After replacing the relay, it may be necessary to reset errors in the ECU. If the panel lights up CHECK ENGINE, use a diagnostic scanner or disconnect the battery for 10 minutes.

Common mistakes when replacing relays

Even something as simple as replacing a relay can lead to new problems if mistakes are made. That's what can't do on Nissan Avenir:

• 🔌 Use a relay from a different model (for example, from Nissan Primera). Even if it is externally identical, the current characteristics may not match, which will lead to burning of the contacts.
• 🔧 Install the relay upside down. Contacts 85 And 86 - this is a coil, and 30 And 87 — power part. If mixed up, the relay will burn out immediately after turning on the ignition.
• 🔋 Don't check the fuse. If it burns out, the new relay will also fail the first time it is turned on.
• 🛠️ Ignore contact oxidation. On Avenir Fuse boxes often suffer from moisture, so before installing a new relay, clean the seat with alcohol or a special cleaner.

Another common mistake is buying cheap Chinese analogues. Such relays often “stick” after several months of use. It is better to overpay for the original or a trusted manufacturer (for example, Denso or Panasonic).

Relay cost and where to buy it

Fuel pump relay price for Nissan Avenir depends on the type (original or analogue) and place of purchase. On average, the cost varies as follows:

Relay type	Article	Price, rub.	Where to buy
Original (Nissan)	25230-31U00	1 200–1 800	Official dealers, Exist.ru
Analogue (Denso)	055800-8660	600–900	Autodoc, Autosphere
Analogue (Bosch)	0 332 019 150	500–750	Emex, AliExpress (be careful with fakes!)
Used (from disassembly)	—	300–500	Local showdowns, Avito

When purchasing, pay attention to:

• 📌 Compatibility with your modification Avenir (specify year of manufacture and engine type).
• 📌 Availability of guarantee (at least 3 months).
• 📌 Contact status (on a used relay there should be no signs of burning).

If you are buying online, check the seller's reviews - there are many fake relays on the market that fail after a week. On AliExpress pay attention to the store rating (must be at least 98%).

FAQ: Frequently asked questions about the fuel pump relay Nissan Avenir

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

No, it's dangerous. If the relay does not work, the fuel pump will not pump fuel, and the car will either not start or stall while driving. As a last resort, you can temporarily close the contacts 30 And 87 in the fuse box (this will supply voltage directly to the pump), but you can’t drive like this all the time - there’s a risk of fire!

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

If the relay clicks, but the pump does not work, the problem is in the pump itself or in the wiring. If the relay does not click, check it with a multimeter (as described above) or replace it with a known good one. Also pay attention to the fuse (it can burn out if there is a short circuit in the pump).

Is it possible to repair the fuel pump relay?

Theoretically, you can try to disassemble the relay and clean the contacts, but in practice this rarely helps for long. It’s better to buy a new one - it’s inexpensive, and the time it takes to repair the old one is often not worth it.

Why on Avenir W11 Does the fuel pump relay often fail?

On this generation, the fuse box is located in the passenger compartment, where moisture accumulates (especially if the windshield or ventilation leaks). Over time, the contacts oxidize and the relay begins to “fail.” The solution is to move the unit to a drier place or treat the contacts with a special lubricant (for example, Liqui Moly Kontaktreiniger).

Which relay can be used instead of the original one?

Analogues from Denso (article 055800-8660), Bosch (0 332 019 150) or Hella (4RA 003 507-331). The main thing is that the relay is designed for a current of at least 20A and had a standard 4-pin connector.