<em>Nissan Note</em> fuel pump pinout: circuit analysis, wire colors and diagnostics

Fuel pump in Nissan Note - a critical component of the fuel system, on which stable engine operation depends. Incorrect or damaged wiring can result in failure to start, jerky driving, or even failure of the electronic control unit (ECU). In this article we will analyze in detail fuel pump connector pinout, we will decipher the colors of the wires, explain their purpose and show how to independently check the circuit without specialized equipment.

Feature Nissan Note (especially models E11 And E12 with engines HR15DE And HR16DE) is that the pinout of the fuel pump may vary slightly depending on the year of manufacture and configuration. For example, in versions with the system start-stop additional signal wires are added to monitor pressure. We took these nuances into account and collected current data for most modifications.

If you encounter problems like unstable idle, failures during acceleration or lack of fuel supply, the first thing you should do is check the fuel pump and its electrical circuits. Our instructions will help you avoid mistakes during diagnostics and repairs.

The design and principle of operation of the fuel pump in Nissan Note

Fuel pump in Nissan Note is a submersible electric unit installed directly in the fuel tank. Its main task is to create the pressure in the system necessary for fuel injection through the injectors. Unlike carburetor systems, where the pump is mechanical, it uses DC motor with an impeller, which is controlled by the ECU via a relay.

Structurally, the unit includes:

• 🔋 Electric motor — rotates the impeller, creating pressure.
• 🌀 Impeller — pumps fuel into the line.
• 🔌 Check valve — maintains residual pressure after turning off the ignition.
• 📶 Fuel level sensor (integrated into the module) - transmits data to the dashboard.
• 🔌 Power connector — connects the pump to the on-board network.

When the ignition is turned on, the ECU sends a signal to fuel pump relay (usually located in the fuse box under the hood or in the passenger compartment) that completes the circuit. Voltage is supplied to the pump and it begins to work. If the engine does not start within 2-3 seconds, the ECU cuts off power to save energy and safety.

Fuel pump connector pinout: wire colors and pin assignments

Fuel pump connector in Nissan Note usually has 4 or 5 contacts (depending on the year of manufacture). Below is the standard pinout for most models E11/E12 (2006–2016):

Contact number	Wire color	Purpose	Notes
1	Black (BLK)	Weight (–)	A common disadvantage for the pump and fuel level sensor.
2	Red (RED) or Pink (PNK)	Plus 12V (from relay)	Power is supplied only when the ignition is on.
3	Green (GRN) or Blue (BLU)	Fuel level sensor signal	Transmits data to the dashboard (analog signal).
4	White (WHT) or Gray (GRY)	ECU control signal	May be absent in some versions (depending on the firmware).
5 (optional)	Orange (ORG)	Feedback signal (for start-stop systems)	Only available on models with automatic engine stop.

It is important to consider that in Nissan Note with engine K4M (1.6 l, Renault) pinout may vary - it is often used there 3-pin connector, where there is no separate wire for the fuel level sensor. In such cases, the sensor is connected via a separate harness.

How to check a fuel pump and its circuits with a multimeter

If you suspect a fuel pump malfunction, the first thing you should check is availability of nutrition and mass on its connector. To do this, you will need a multimeter in DC voltage measurement mode (DC 20V). Follow the algorithm:

1. Disconnect the fuel pump connector (located under the rear seat, under the hatch cover).
2. Turn on the ignition (but do not start the engine).
3. Connect red multimeter probe to contact 2 (plus, red/pink wire), and black dipstick - to contact 1 (ground, black wire).
4. The voltage should be 12–12.5 V. If it is lower 11.5 V, the problem is in the power circuit (check the relay, fuse, wiring).

If there is power, but the pump does not work:

• 🔧 Check it out pump winding resistance (between contacts 1 And 2). Normal value - 0.5–2.0 Ohm. If the resistance tends to infinity, the winding breaks.
• 🔋 Check it out mass between contact 1 and the car body. The resistance should be close to 0 ohm.
• 📶 If the pump hums but does not pump fuel, it is possible filter mesh clogged or impeller wear.

Check the voltage at the connector (12V)|Measure the winding resistance (0.5–2 Ohm)|Check the ground on pin 1|Inspect fuse F30 and relay K25|Listen to the pump when the ignition is turned on-->

⚠️ Attention: Do not run the fuel pump dry (without fuel in the tank) for more than 5-10 seconds - this can lead to overheating and failure. If the tank is empty, add at least 5 liters of gasoline before checking.

Typical fuel pump malfunctions and their symptoms

Fuel pump malfunctions Nissan Note They manifest themselves in different ways, but the most common symptoms are:

• 🚗 Engine won't start (no fuel supply).
• ⚡ Jerking when accelerating (unstable pressure in the system).
• 🔊 The hum of the pump is constantly heard (even after starting the engine) is a sign of wear or jamming.
• ⛽ Increased fuel consumption (the pump wears out and does not create the required pressure).
• 🔋 Power loss at high speeds (“failures” due to lack of fuel).

Frequent causes of breakdowns:

• 🔥 Pump overheating due to driving with an almost empty tank (fuel cools and lubricates the pump).
• 🧹 Clogged filter mesh (it is recommended to clean every 30–50 thousand km).
• 🔌 Oxidation of contacts in the connector (especially important for humid climates).
• 🔋 Wear of motor brushes (typical for used pumps > 150 thousand km).

If the pump is completely out of order, it will have to be replaced. Original article for Nissan Note E11/E12 — 17040-4M000 or 17040-4M005 (depending on modification). Analogues: Bosch 0 580 454 035, Denso 950-0101.

How to check fuel rail pressure without a pressure gauge?

If you don't have a pressure gauge at hand, you can roughly estimate the pressure in the following way:

1. With the engine running, locate the pressure control fitting on the fuel rail (usually closed with a cap).

2. Press the spool with a screwdriver - a uniform fountain of gasoline should come out of it.

3. If the stream is weak or intermittent, the pressure is insufficient (normal for Nissan Note — 3.5–4.0 bar).

⚠️ Be careful: gasoline under pressure may splash into your eyes!

Replacing the fuel pump in Nissan Note: step by step instructions

If the diagnostics confirm that the pump is faulty, it must be replaced. For this you will need:

• 🔧 Set of sockets and extension.
• 🔨 Flat screwdriver.
• 🧤 Gloves (gasoline corrodes the skin).
• 🧹 Rag for collecting spilled fuel.

Work order:

1. Disable negative battery terminal.
2. Remove the rear seat (pull up firmly).
3. Under the rug, find the fuel pump hatch (attached with 4 screws or latches).
4. Disconnect power connector And fuel hoses (use a flat head screwdriver for the fasteners).
5. Unscrew clamping ring (counterclockwise) and carefully remove the pump module.
6. Replace the pump or the entire module (if required), paying attention to the orientation of the level sensor float.
7. Reinstall everything in reverse order, making sure the O-ring is not damaged.

⚠️ Attention: When installing a new pump, do not forget rearrange the strainer from the old module (if it is in good condition) or replace it with a new one. A clogged filter reduces the life of even a working pump.

Frequent mistakes during diagnostics and repairs

Many car owners make typical mistakes that complicate repairs or lead to repeated breakdowns. That's what can't do:

• 🔌 Ignore relay and fuse check — often the problem lies not in the pump, but in the power circuit.
• 🔧 Use force when removing the clamping ring - it may break, and then the entire module will need to be replaced.
• ⛽ Start the engine with a half-empty tank after replacing the pump - this reduces its resource.
• 🧹 Do not clean the tank of dirt before installing a new pump. — debris will quickly clog the new filter.
• 🔋 Connect the pump directly to the battery for testing - without load it will burn out in a few seconds.

Another common mistake is buying cheap analogues instead of the original pump. For example, Chinese pumps for 3–5 thousand rubles often fail due to 10–20 thousand km, whereas the original or a high-quality analogue (Bosch/Denso) serves 100+ thousand km.

It is also worth remembering that after replacing the pump it may be necessary to reset fuel system adaptations (especially if the ECU recorded pressure errors). To do this:

1. Connect a diagnostic scanner (for example, Launch X431 or ELM327).
2. Reset fuel system errors (P0171, P0172, P0190 etc.).
3. Drive 50–100 km in gentle mode so that the ECU adapts again.

FAQ: Frequently asked questions about the fuel pump Nissan Note

Is it possible to drive if the fuel pump is noisy but works?

If the pump emits constant hum (not a short hum when the ignition is turned on), this is a sign wear of bearings or impeller. You can drive, but not for long — the pump can jam at any moment. We recommend replacing it as soon as possible. 1–2 weeks.

What pressure should be in the fuel rail Nissan Note?

Normal pressure for engines HR15DE/HR16DE:

• Idling: 3.0–3.5 bar.
• When releasing gas: 2.8–3.0 bar.
• When pressing the gas: up to 4.0 bar.

If the pressure is lower 2.5 bar, the pump is faulty or the filter is clogged.

Where is the fuel pump relay located? Nissan Note E11?

Fuel pump relay (K25) located in fuse box under the hood (near the battery). To find it:

1. Open the unit cover (press the latches).
2. The relay is in bottom row, third from the right.
3. There should be a fuse nearby F30 (15A) — he is responsible for the pump circuit.

What should I do if the car does not start after replacing the pump?

If the engine does not start after replacement, check:

• 🔌 Correct connector connection (plus and mass should not be confused).
• ⛽ Availability of gasoline in the tank (the new pump may not pump air).
• 🔧 O-ring integrity (if it is damaged, there will be air leaks).
• 📶 No errors in the ECU (For example, P0190 — open circuit of the pressure sensor).

If everything is fine, but the car won't start, try crank the starter 3-4 times for 5 seconds - this will help the pump fill the system with fuel.

Which fuel pump is best to choose for Nissan Note - original or analogue?

Optimal options:

• Original (17040-4M000) - reliable, but expensive (8–12 thousand rubles).
• Bosch 0 580 454 035 - the best analogue, resource 150+ thousand km.
• Denso 950-0101 - a little cheaper than Bosch, but also of high quality.

Cheap analogues (3–4 thousand rubles) often have weak motor and fail through 20–30 thousand km.