Starter relay <em>Nissan Atlas TD27</em>: diagnostics, replacement and selection of spare parts

Nissan Atlas with diesel engine TD27 - a reliable truck, but even it has problems with electrical equipment over time. One of the most common malfunctions is starter relay, which is responsible for supplying current to the solenoid relay and starting the engine. If you hear clicks when you turn the key, but the starter does not turn, or the engine starts only after several attempts, this is the culprit.

In this article we will look at how check the starter relay for Nissan Atlas TD27, what signs indicate its malfunction, and how to choose the right replacement. We will also provide step-by-step instructions for dismantling and installation, so that you can cope without the help of a car service. We will pay special attention A common diagnostic mistake is confusing the symptoms of a faulty relay with solenoid or battery problems..

Signs of a faulty starter relay on Nissan Atlas TD27

The starter relay is a small but critical element of the starting system. Its breakdown manifests itself clearly, and the symptoms cannot be ignored: this can lead to a discharge of the battery or a complete failure of the starter. Here are the key signs:

• 🔊 Starter clicks without cranking: When you turn the key, you hear a single or multiple click, but the engine does not start. This indicates that the relay is activated, but the contact group does not close.
• 🔄 Starting "the second time": The starter only works after several attempts to turn the key. This is often due to burnt contacts inside the relay.
• 🔋 Voltage drop at startup: The lights on the dashboard dim, but the starter does not turn. This may indicate a breakdown of the relay winding or poor contact.
• 🚗 The car starts only "from the pusher": if the starter works in a roundabout way (by closing the contacts), the problem is definitely in the relay.

It is important to distinguish a relay malfunction from problems with starter solenoid relay or battery. For example, if there is not even a click when you turn the key, either the battery or the starter circuit fuse is to blame. And if the starter turns, but does not engage, the problem is in the fuel system or glow plugs (for a diesel engine).

⚠️ Attention! On Nissan Atlas TD27 The starter relay is often confused with starter lock relay (immobilizer), which is located in a different location. If the car does not start at all (there is not even a click), check the fuse first F10 (10A) in the block under the steering wheel.

Where is the starter relay located on Nissan Atlas TD27?

Depending on the year of manufacture and modification Atlas, the starter relay can be located in two places:

1. Main relay block — under the hood, next to the battery, in a black plastic box. The starter relay is usually labeled as STARTER RELAY or has a number 25730-31U00 (Nissan original).
2. Additional block — in the cabin, under the instrument panel on the driver’s side. In this case, the relay can be combined with a locking relay or an immobilizer.

To accurately identify a relay, pay attention to its color and marking:

• 🔘 Original relay Nissan - black with white label and inscription 12V 40A.
• 🔘 Analogues (for example, Bosch or Hella) - can be gray or blue, but must be marked 4-pin.

Relay model	Article	Location	Note
Original Nissan	25730-31U00	Block under the hood	Black body, 12V 40A
Bosch 0332019150	0332019150	Universal	Suitable for most diesel Nissan
Hella 4RA 003 553-261	4RA003553261	Block under the hood	Long service life, sealed housing
JP Group 1187201300	1187201300	Universal	Budget analogue, average quality

If you are not sure about the location, use electrical circuit diagram for your modification Atlas TD27. On most models, the starter relay is located next to the fuel pump relay (usually red).

How to test the starter relay with a multimeter?

Diagnostics of the starter relay does not require special skills - a multimeter and knowledge of electrical engineering are enough. We carry out the check in two stages: visual inspection And dialing contacts.

1. Visual inspection

Remove the relay and inspect it for:

• 🔥 Burnt contacts - black or melted marks on the legs.
• 💧 Traces of corrosion — green coating on copper contacts.
• 🔌 Cracks on the body - can lead to moisture ingress and short circuiting.

2. Test with a multimeter

To check the relay:

1. Set the multimeter to mode continuity (Ω).
2. Connect the probes to the contacts 85 And 86 (managers). There must be resistance 50–120 Ohm.
3. Serve 12V to contacts 85 And 86 (possible from battery). There should be a click - this is the relay activated.
4. Call contacts 30 And 87 (power). When 12V is supplied, the resistance should be 0 ohm (closed), no voltage - ∞ (open).

If the relay does not click or the contacts do not close, it needs to be replaced. Also check wiring integrity from relay to starter and battery.

What to do if the relay clicks, but the starter does not turn?

If the relay activates (there is a click), but the starter does not turn, the problem may be:

• 🔋 Low battery - check the voltage (must be at least 12.4V).
• 🔌 Oxidized starter terminals — clean the contacts with sandpaper.
• 🔧 Faulty solenoid relay - requires replacement or repair.
• 🔄 Mass break — check the wire from the body to the engine.

⚠️ Attention! Do not try to “reanimate” the relay by cleaning the contacts with sandpaper - this is a temporary solution. Burnt contacts indicate starter circuit problems (for example, a weak battery or a worn starter), which will lead to repeated failure of the relay.

Step-by-step replacement of the starter relay with Nissan Atlas TD27

Replacing the starter relay is a simple procedure that takes no more than 10 minutes. You will need:

• 🔧 Flat screwdriver (for removing the relay block cover).
• 🔌 New relay (original or analogue from the table above).
• 🧤 Gloves (optional, so as not to get your hands dirty).

Disconnect the negative terminal of the battery

Find the relay block (under the hood or in the cabin)

Take a photo of the location of the relay (so as not to confuse it during installation)

Prepare a new relay for replacement

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Replacement instructions

1. Disconnect the battery. Remove the negative terminal to avoid short circuit.

2. Remove the relay box cover. It is usually secured with latches or a single screw.

3. Find the starter relay. Refer to the markings or compare with a photo of the old relay.

4. Remove the faulty relay. Pull it up, wiggling it slightly (do not use too much force to avoid breaking the legs).

5. Install a new relay. Insert it into the same connector, making sure the pins match.

6. Check your work. Connect the battery and try to start the engine.

If the starter still does not work after replacing the relay, check:

• 🔌 Starter circuit fuse (usually F10 10A or F20 15A).
• 🔋 Battery charge - at low voltage the relay may not operate.
• 🔧 Starter condition - may need repair or replacement.

Selecting a starter relay: original vs analogues

When purchasing a new starter relay for Nissan Atlas TD27 you have two options: original relay from Nissan or analogues from third-party manufacturers. Let's look at the pros and cons of each.

Original relay Nissan (25730-31U00)

Benefits:

• ✅ Guaranteed compatibility with the electrical system Atlas TD27.
• ✅ High resource (average service life - 100,000 km).
• ✅ Sealed case, resistant to moisture and dust.

Disadvantages:

• ❌ High price (from 1500 to 2500 rubles).
• ❌ In some regions it is difficult to find in stock.

Analogues from Bosch, Hella, JP Group

Pros:

• ✅ The price is 2-3 times lower than the original (from 500 rubles).
• ✅ Wide range in stores.
• ✅ Some analogues (for example, Hella) are superior to the original in terms of contact quality.

Cons:

• ❌ Possible compatibility issues (check labeling!).
• ❌ The resource is lower than that of the original (on average 50,000–80,000 km).

Criterion	Original Nissan	Bosch 0332019150	Hella 4RA003553261
Price, rub.	1500–2500	600–900	800–1200
Resource, km	100 000+	60 000–80 000	80 000–100 000
Moisture resistance	⭐⭐⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐⭐
Ease of installation	⭐⭐⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐

Our advice: if Atlas TD27 is used in difficult conditions (high humidity, frequent starts), it is better to overpay for the original. Suitable for normal use Hella or Bosch.

Common mistakes when diagnosing and replacing the starter relay

Even experienced drivers sometimes make mistakes when working with the starter relay. Here are the most common:

1. Confusing the starter relay with the locking relay. On Atlas TD27 There is a separate relay with the immobilizer that can also cause starting problems. It is usually located in the cabin.

2. Don't check fuses. Before replacing the relay, be sure to check the starter circuit fuse (F10 or F20).

3. Ignore battery status. If the battery is discharged, the relay may not operate even if it is working properly.

4. Install a relay with different characteristics. For example, a relay on 30A instead of 40A will quickly fail.

5. Do not clean the contacts in the relay block. Oxidized connectors can cause poor contact even with a new relay.

⚠️ Attention! If after replacing the relay the starter starts working, but after a while the problem returns, check starter for current consumption. A worn starter draws more current, causing the relay contacts to burn out.

Preventing starter relay faults

To keep the starter relay on Nissan Atlas TD27 last longer, follow simple recommendations:

• 🔋 Monitor your battery charge. A discharged battery causes the relay to overload.
• 🔌 Clean your contacts. Once a year, clean the relay legs and connectors in the block from oxidation (use WD-40 or special lubricant).
• 🚗 Do not hold the key in the "Start" position for more than 5 seconds. This leads to overheating of the relay coil.
• 🔧 Check the starter. If it starts to turn "tight", replace the brushes or the solenoid relay so as not to overload the circuit.

It is also useful to check once every six months starter circuit voltage multimeter. When starting it should not fall below 10.5V. If the voltage drops more, look for the cause in the battery or starter.

FAQ: Frequently asked questions about the starter relay Nissan Atlas TD27

Is it possible to drive with a faulty starter relay?

Technically it is possible, but it is inconvenient and dangerous. If the relay clicks but does not close the contacts, you can start the car “bypassing” (closing the contacts with a screwdriver), but this is fraught with:

• 🔥 Fire due to sparking.
• 🔋 Battery discharge.
• 🔧 Breakdown of the starter (due to direct connection without protection).

It is better to replace the relay immediately.

How to distinguish a faulty relay from problems with the starter?

Do a simple test:

1. Turn the key to the "Start" position. If clicks are heard, the relay is activated.
2. If there are no clicks, the problem is in the control circuit (fuse, ignition switch, lock relay).
3. If there are clicks, but the starter does not turn, close the contacts with a screwdriver 30 And 87 on the relay. If the starter spins, the relay is at fault.

Which starter relay is suitable for Nissan Atlas TD27 1995?

For models before 1998, the original relay is suitable 25730-31U00 or analogues:

• Bosch 0332019150.
• Hella 4RA 003 553-261.
• JP Group 1187201300.

Models after 1998 may require a relay with a different part number (25730-4M000). Check by VIN code.

Can the starter relay be repaired?

Theoretically yes, but this is a temporary solution. For repair:

1. Disassemble the relay housing (carefully so as not to break the latches).
2. Clean the burnt contacts with sandpaper (zero).
3. Check the integrity of the winding (resistance between 85 And 86 there must be 50–120 Ohm).

However, after such repairs the relay will not last long. It's better to replace it with a new one.

Where to buy a starter relay for Nissan Atlas TD27?

The original relay can be ordered:

• 🛒 At official dealerships Nissan (expensive, but reliable).
• 🌍 On Exist.ru, Autodoc or Emex (cheaper, but check the article number).

Analogues (Bosch, Hella) are sold at any auto parts store (for example, AutoSpetsCenter, IXORA).