Nissan Almera N16 (2000-2006) is a popular sedan, but as it ages, its fuel system begins to malfunction. One of the common problems is fuel pump relay, which is responsible for supplying voltage to the pump. If your car suddenly stalls, won't start, or runs rough, this small but critical element may be the culprit.

In this article we will look at how find the fuel pump relay on Almera N16, check its performance with a multimeter, and also replace it without contacting service. We will pay special attention typical diagnostic errors that lead to unnecessary replacement of the pump itself or the fuse. If you are faced with the problem “the fuel pump does not pump,” read on.

Where is the fuel pump relay located on Nissan Almera N16

B Nissan Almera N16 The fuel pump relay is located in fuse and relay box, which is under the hood, next to the battery. Exact location:

  • 🔧 Open the hood and find black plastic block to the right of the battery (if viewed in the direction of travel).
  • 🔍 Remove the unit cover by pressing the latches on the sides.
  • 📋 The fuel pump relay is marked as FUEL PUMP RELAY or is marked R17 (on some versions - R27).
  • 🔌 It is installed in top row, closer to the center of the block (see diagram below).

It is important not to confuse it with fuel pump fuse (usually 15A, denoted as FUEL PUMP), which is located in interior fuse box (under the steering wheel, to the left of the pedals). If the fuse is blown, this is often a secondary problem caused by a faulty pump or relay.

📊 Where is your fuel pump relay box located?
  • Under the hood next to the battery
  • In the cabin under the steering wheel
  • I don't know, I haven't looked yet
  • Another option

Signs of a faulty fuel pump relay

Fuel pump relay Almera N16 fails gradually or suddenly. Main symptoms:

  • 🚗 Car won't start, but the starter turns (there is no characteristic buzzing of the pump when the ignition is turned on).
  • ⚡ Engine stalls while driving, especially when heated (the relay “sticks” in the open state).
  • ⛽ Jerks when moving — the pump operates intermittently due to poor contact in the relay.
  • 🔋 Lights up on the dashboard CHECK ENGINE (error P0190 or P0193 - low voltage in the pump circuit).

🔎 How to distinguish a relay malfunction from a breakdown of the pump itself? When the ignition is turned on (ON, but not START) a working pump should buzz for 2–3 seconds (heard under the back seat). If there is no sound, the problem is in the relay, fuse or wiring. If the pump hums, but the car does not start, it’s the fault fuel pressure regulator or injectors.

What to do if the pump hums, but the car does not start?

If the fuel pump works (you can hear a whirring noise) but the engine does not start, check:

1. Pressure in the fuel rail (should be 3–4 bar).

2. Serviceability of injectors (check them with a multimeter).

3. Performance of the mass air flow sensor and lambda probe (errors P0100, P0171).

4. Presence of a spark on the spark plugs (the problem may be in the ignition module).

How to check the fuel pump relay with a multimeter

To diagnose the relay you will need multimeter (or control lamp) and a screwdriver. Procedure:

  1. Remove the relay from the block (carefully pry it off with a screwdriver).
  2. Check your contacts for oxidation or burning (clean with fine sandpaper).
  3. Ring the winding:
    • 🔌 Connect the multimeter probes to the terminals 85 And 86 (see diagram on the relay body).
    • 📊 There must be resistance 50–120 Ohm. If ∞ - break if 0 - short circuit.
  4. Check the functionality of the contacts:
    • 🔋 Serve 12V on 85 And 86 (from the battery through the light bulb).
    • 🔊 There should be a click - this means the relay is triggered.
    • 📶 Check the resistance between 30 And 87: off - ∞, in included - 0 ohm.

Remove the relay from the block|Check the contacts for oxidation|Ring the winding (85–86)|Apply 12V and check operation|Measure the resistance between 30–87-->

⚠️ Attention! If the relay clicks, but the pump does not turn on, the problem is wiring (open or short circuit) or in mass (check the pump ground mounting point under the rear seat). Do not replace a relay at random - first make sure that its contacts 85 And 86 comes 12V from the ECU!

Fuel pump relay connection diagram

Electrical circuit diagram of the fuel pump circuit Nissan Almera N16 includes:

  • 🔋 Battery (food +12V to contact 30 relay).
  • 📶 ECU (sends a signal to the contact 86 relay when the ignition is turned on).
  • ⛽ Gasoline pump (connected to contact 87 relay).
  • 🔌 fuse (15A, in the cabin block).

Relay contact Purpose Wire Color (Typical)
30 Permanent +12V from the battery Red or orange
85 Weight (ECU controlled) Black or brown
86 Signal from the ECU (+12V when the ignition is turned on) Green or blue
87 Output to fuel pump Gray or yellow

🔧 How to test a circuit without a relay? Insert a jumper into the relay socket between 30 And 87. If the pump starts working, the problem is in the relay or signal from the ECU. Do not leave the jumper on for too long - it may burn the fuse or the pump!

Replacing the fuel pump relay: step-by-step instructions

If the relay is faulty, it must be replaced. Suitable analogues for Almera N16:

  • 🔧 Original relay: Nissan 25230-4M000 or 25230-4M005.
  • 🛒 Analogues: Bosch 0 332 209 150, Hella 4RA 003 503-131, Meat & Doria RLY-103.

Replacement procedure:

  1. Disable negative battery terminal (required!).
  2. Remove the relay box cover under the hood.
  3. Remove the faulty relay (pry it out with a screwdriver).
  4. Install a new relay same markings (pay attention to the location of the contacts!).
  5. Check the operation: turn on the ignition - you should hear the relay click and the pump hum.

💡

Before purchasing a relay, check it on site: ask the seller to apply 12V to pins 85–86 and listen for a click. Many "new" relays on the market are defective.

⚠️ Attention! If the pump does not work after replacing the relay, check:

  • 🔌 fuse (15A in the cabin block).
  • 📶 Wiring from the relay to the pump (often frays under the trunk mat).
  • 🔋 Mass pump (mounting point under the rear seat).

Typical mistakes during diagnostics and repair

Many owners Almera N16 make mistakes that lead to unnecessary expenses or worsening the problem:

  • 🔧 Replacing a pump instead of a relay. The pump costs 5–10 times more than the relay, but it is often the culprit.
  • 🔌 Ignoring the fuse. If it is burned out, the relay will not receive power.
  • 📶 Checking the relay without load. The relay may click, but not withstand the pump current (check under load!).
  • 🔋 Untested mass. Poor pump ground contact simulates a relay failure.

🔎 How to avoid mistakes?

  • Always check fuse And mass before replacing the relay.
  • Use multimeter, and not just hearing (the pump may hum slightly, but not pump fuel).
  • Buy a relay only proven brands (Bosch, Hella) - cheap Chinese analogues often fail.

💡

If after replacing the relay the pump works, but the car stalls while driving, the problem is in the wiring or the pump itself. The relay has nothing to do with it!

Frequently asked questions about the fuel pump relay Nissan Almera N16

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

No. If the relay does not work, the pump does not pump fuel, and the car won't start. In rare cases, the relay “sticks” in the closed state, and the pump runs constantly - this leads to pump overheating and its imminent breakdown. In both cases, driving is impossible or dangerous.

Which relay is suitable for other cars?

On Almera N16 Relays from:

  • Nissan Primera P12 (similar relay block).
  • Renault Megane 2 (relay Bosch 0 332 209 150).
  • Opel Astra H (fuel pump relay with the same contacts).

The main thing is coincidence contact diagrams And current load (no less 20A).

Why does a new relay burn out quickly?

If the new relay fails after a short time, the reasons may be as follows:

  • 🔌 Short circuit in the pump wiring (check the insulation).
  • ⚡ Increased resistance in the circuit (oxidized contacts, poor ground).
  • ⛽ Faulty fuel pump (consumes too much current).

Before replacing the relay Be sure to check the circuit with a multimeter!

How to test a relay without a multimeter?

If you don't have a multimeter, use control lamp or dialing:

  1. Remove the relay and insert it into the socket good relay (for example, from a fan).
  2. If the pump starts working, your relay is faulty.
  3. If not, check fuse And wiring.

You can also submit 12V from battery to contacts 85–86 and listen for a click.

Where to buy an original relay for Almera N16?

Original relay Nissan 25230-4M000 can be found:

  • 🛒 At official dealerships (expensive, but reliable).
  • 🌍 On Exist.ru, Autodoc or Emex (price ~300–500 rub.).
  • 🔧 In auto electrics stores (ask for a relay for Nissan with markings 12V 30/40A).

Beware of fakes - the original relay has black body with white markings.