ECCS relay on Nissan: where is it located, how to check and replace it yourself

Electronic engine management system ECCS (Electronic Concentrated Control System) is the “brain” of any modern Nissan, responsible for fuel injection, ignition and other critical processes. When the car starts to jerk, stall or display an error message P0335 (crankshaft sensor malfunction), the culprit is often ECCS relay - a small but vital component.

The problem is that its location varies not only depending on the model (Qashqai, X-Trail, Almera Classic), but also on the year of manufacture. In this article we will look at exact ECCS relay coordinates for 15+ popular Nissan models, we’ll show you how to visually distinguish it from other relays in the block, and give a checklist for diagnostics without a scanner. And if you are already faced with the fact that the car will not start or runs jerkily, here you will find step-by-step replacement instructions with photos and typical mistakes of beginners.

What is an ECCS relay and why is it needed?

Relay ECCS (sometimes called engine control system main relay) performs two key functions:

• 🔌 Power Supply to the engine control unit (ECU) when the ignition is turned on. Without this signal ECU it simply “sleeps” and does not control injection.
• ⚡ Circuit protection from power surges that can damage expensive electronics.

When a relay fails, the symptoms may resemble a fault crankshaft sensor, ignition coils or even fuel pump. This is why many car owners spend time and money replacing “innocent” parts. For example, if Nissan Tiida stalls 5 seconds after starting, with a 70% probability it is the relay that is to blame - and not the spark plugs or the fuel pump.

Important to understand: ECCS relay not the sameThat's a fuel pump relay! The latter is usually located separately and is responsible only for the supply of gasoline. But the ECCS relay is a “switch” for the entire engine control system.

Signs of a faulty ECCS relay: how to recognize the problem

Symptoms of a non-working relay are often disguised as other failures. Here 5 Key Signsthat should alert you:

• 🚗 Engine won't startalthough the starter turns. In this case, a clicking sound may be heard from the relay block (this is the faulty relay trying to operate).
• ⚠️ The car starts and immediately stalls - a typical symptom for Nissan Almera N16 And Primera P12.
• 📉 Floating speed at idle speed, especially after the engine has warmed up.
• 🔧 Errors P0335, P0340 or P0600 on the dashboard (linked to crankshaft/camshaft sensors or ECU).
• 💡 Check Engine Warning Light lights up and goes out randomly.

If you observe at least 2-3 items from the list, the likelihood of a problem with the ECCS relay is 80-90%. But before replacing, be sure to check:

1. The voltage at the battery terminals (must be at least 12.4 V).
2. ECCS relay fuse status (usually 10A or 15A, the number is in the manual).
3. Relay contacts for oxidation (a common problem after washing under the hood).

Where is the ECCS relay located on a Nissan: detailed diagrams by model

The location of the relay depends on models, year of manufacture and even configuration. Below is a table with exact coordinates for popular cars:

Model Nissan	Years of manufacture	ECCS relay location	Number in block
Qashqai J10/J11	2007–2021	Relay box under the hood, next to the battery	R17 or R27
X-Trail T31/T32	2007–2020	In the cabin, behind the glove compartment (relay block on the right)	R101
Almera Classic N16	2006–2012	Under the hood, relay box near the windshield	R14
Tiida C11	2004–2012	In the cabin, under the dashboard on the driver's side	R103
Primera P12	2002–2008	Under the hood, relay box next to ECU	R3

For an accurate search, follow the algorithm:

1. Open official catalog Nissan TechInfo and enter your vehicle's VIN.
2. Find the diagram Power Distribution (power distribution) - the ECCS relay will be indicated there.
3. Compare the shape and color of the relay with the photo below (standard ECCS relay is black or dark gray, with markings ECCS RELAY).

How to find a relay if it is not in the block?

On some models (for example, Nissan Juke 2015+) ECCS relay integrated into the unit ECU and cannot be separately replaced. In this case, diagnostics of the control unit itself is required.

Step-by-step instructions: how to test the ECCS relay with a multimeter

To check you will need multimeter (or even a simple 12V light bulb). Follow this algorithm:

Detailed explanation of steps:

1. Removing the relay: Carefully pry the relay with a screwdriver (do not pull on the wires!). There should be a contact diagram on the reverse side.
2. Coil continuity: connect the multimeter probes to the contacts 85 And 86. The resistance of a working coil is 50–120 Ohm. If it shows 0 (short circuit) or ∞ (break), the relay is faulty.
3. Checking contacts: serve 12V on 85 And 86 (polarity is not important). There should be a click and the contacts 30 And 87 close (check with a multimeter in continuity mode).

If the relay does not click or the contacts do not close, it needs to be replaced. Average price of a new ECCS relay for Nissan — 800–1500 rub., original article: 25230-4M000 or 25230-4M005.

Typical mistakes when replacing the ECCS relay: how not to damage the car

It would seem that replacing a relay is a simple operation. But even here there are pitfalls that can aggravate the problem:

⚠️ Attention: Never use relays from other systems (such as fan or headlight relays) instead of ECCS! They may have a similar body, but different response parameters. This will lead to fuse blown or failure ECU.

3 more critical errors:

• 🔧 Ignoring the fuse: If the relay is burnt out, check the fuse (usually 10A in the same block). Replacing it without finding the cause of the short circuit will lead to re-combustion.
• 💧 Working in the rain: Moisture entering the relay box may cause corrosion of the contacts. Use WD-40 for cleaning after replacement.
• 🔌 Incorrect installation: the relay should enter the block with a slight click. If it dangles, the contacts are not in contact with the board.

If the problem remains after replacing the relay, check:

• Integrity of wiring from relay to ECU (windshield wires often fray).
• Contact voltage 30 relay (must be 12V with the ignition on).
• State of "mass" ECU (clean the point where the ground attaches to the body).

Alternative diagnostic methods without a multimeter

If you don't have a tester at hand, you can use improvised means:

1. Replacing with a known good relay: Take a relay from a similar model (such as a fan or defroster relay) and temporarily install it in place of the ECCS. If the car starts, the problem is in the relay.
2. Test by ear: should be audible when the ignition is turned on two clicks - first the ECCS relay, then the fuel pump. If there is no first click, the relay does not operate.
3. Visual inspection: burnt or melted contacts on the relay are a sure sign of a malfunction.

For owners Nissan Almera Classic And Primera P12 There is a “folk” method: lightly press the relay in the block with the ignition on. If the engine starts, the relay contacts have oxidized and require cleaning or replacement.

Where to buy an ECCS relay for Nissan: original vs analogues

When choosing a new relay, pay attention to:

Relay type	Article	Price, rub.	Notes
Original Nissan	25230-4M000	1200–1500	1 year warranty, perfect compatibility
Analogue Bosch	0 332 014 150	600–800	Suitable for 90% Nissan models
Analogue Hella	4RA 003 507-241	700–900	Improved contacts, lasts longer

It is better to buy relays in trusted stores:

• 🛒 Official Nissan dealers - guarantee of an original part, but high price.
• 🌍 Exist.ru, Autodoc, Emex — a wide selection of analogues with delivery.
• 🔧 Showdown - cheaper, but there is a risk of running into a worn relay.

⚠️ Attention: Fake ECCS branded relays are often sold in the market Nissan. The original has: laser markings on the case, clear fonts and packaging with a hologram. Counterfeits are usually lighter in weight and have blurry lettering.

FAQ: Frequently asked questions about the ECCS relay on Nissan

Is it possible to drive with a faulty ECCS relay?

Technically possible, but highly undesirable. The engine will operate in emergency mode: increased fuel consumption, loss of power, risk of damage to the catalyst. On some models (for example, Nissan Juke) long-term driving with a faulty relay can lead to ECU flashing.

How to distinguish the ECCS relay from the fuel pump relay?

ECCS relay is usually black or dark gray, with markings ECCS RELAY or ENGINE CONTROL. Fuel pump relay often blue or green, with the inscription FUEL PUMP. On Nissan Qashqai J11 they are located in the same block, but have different numbers: ECCS - R17, fuel pump - R20.

Why does the new ECCS relay burn out quickly?

This is a sign short circuit in the circuit or ECU malfunctions. Check:

• Wiring from relay to ECU for chafing.
• Relay fuse (if it constantly blows, look for a short circuit).
• Contact voltage 30 relay (must be 12V no jumps).

If the problem recurs, diagnostics are required ECU at the stand.

Can I repair the ECCS relay myself?

Theoretically, yes: the relay is disassembled, the contacts can be cleaned with sandpaper (600–800 grit). However, this is a temporary solution - after 1-2 months the contacts will burn out again. For long-term repairs, it is better to buy a new relay or use alarm relay (For example, StarLine) with similar parameters.

Which Nissan models are most likely to suffer from ECCS relay problems?

According to service center statistics, the leaders are:

1. Nissan Almera Classic N16 (2006–2012) - weak wiring to the relay.
2. Nissan Primera P12 (2002–2008) - the relay overheats due to its close location to the radiator.
3. Nissan Tiida C11 (2004–2012) - corrosion of contacts in the relay block.
4. Nissan Qashqai J10 (2007–2013) - problems after washing under the hood.