Removing a generator on a Nissan Murano: instructions with photos and recommendations

Dismantling the generator Nissan Murano - a task that every owner of this crossover faces sooner or later. A faulty generator manifests itself as dim headlights, a low battery, or a characteristic whistle under the hood. If the diagnostics confirm a breakdown, there are two options left: go to a service station or take on the work yourself. The second way saves up to 5-7 thousand rubles, but requires accuracy and knowledge of the nuances.

In this article we will analyze the process of removing the generator Murano generations Z50 (2003-2007), Z51 (2008-2014) And Z52 (2015-2021) with gasoline engines VQ35DE (3.5 l) and QR25DE (2.5 l). We will pay special attention to typical errors that lead to damage to the belt or electronics. You'll learn what tools you'll need, how to get by without a hole, and when to call in a professional.

Signs of a generator malfunction on a Nissan Murano

Before removing the generator, make sure that it is the problem. On Murano Symptoms are often disguised as other problems. For example, a whistle when starting the engine may come from tensioner roller or drive belt, and not from the generator bearing. Here are the key signs that indicate the need for dismantling:

• 🔋 Battery drains overnight — even after a full charge in the morning, the starter turns sluggishly or the car does not start. In this case, the indicator on the dashboard may light up BATT.
• 💡 Dim headlights and backlights — when the engine is running, the brightness changes depending on the speed. This indicates a voltage drop below 12.8 V.
• 🔊 Extraneous noise — a hum or grinding noise from under the hood, which increases with load (turning on the air conditioner, headlights). Worn out is more often to blame rotor bearing.
• 📉 Power surges - at idle speed the multimeter shows 11.5–14.5 V, and when you press the gas it goes beyond the limits 13.8–14.8 V.

If at least two of these signs coincide, the generator must be removed for diagnostics. But first check:

1. Drive belt tension (sagging more than 10 mm when pressed with a finger).
2. Condition of the battery terminals and ground on the body (oxidation or poor contact).
3. fuse 100A in the mounting block under the hood (on Murano Z51 it is located next to the battery).

⚠️ Attention: On Nissan Murano with the system Intelligent Key (keyless entry) keys may need to be resynced after disconnecting the battery. Prepare a spare key fob or immobilizer code in advance.

Tools and consumables for work

To remove the generator Murano You don’t need specialized equipment, but you can’t do without some tools. Here's the full list:

Tool/consumables	Purpose	Note
Head on 10 mm And 12 mm	Unscrewing the generator and tensioner fasteners	It is better to use an extended wrench
Ratchet wrench	Ease of working in cramped conditions	Minimum 1/2" for a secure grip
Torque wrench	Checking the tightening torque (especially for the pulley bolt)	Optional, but recommended for VQ35DE
Assembly spatula or crowbar	Alternator offset to remove belt	Even a strong screwdriver will do
New drive belt	Replacing the old belt (recommended)	For Murano Z51 — 6PK2135 (length 2135 mm)

Additionally prepare:

• 🧲 Magnetic holder for bolts (so as not to lose fasteners in the engine compartment).
• 🔦 Flashlight with bracket (lighting the lower mounts of the generator).
• 🧴 WD-40 or a similar composition (for unscrewing stuck bolts).
• 📸 Phone for photographing the location of the wires (useful for reassembly).

If you plan to replace the entire generator, select an analogue in advance. On Murano generators were installed Hitachi, Mitsuba or Denso with current from 120A to 150A. For engine VQ35DE original article - 23100-4M50A, for QR25DE — 23100-4M00A.

Preparing the car: what needs to be done before removal

Improper preparation may result in short circuits, electronic damage, or personal injury. Follow this algorithm:

1. Disconnect the battery. First remove the negative terminal (–), then plus (+). This will prevent accidental shorts when working with the generator wires.
2. Relieve pressure in the air conditioning system. If you plan to remove the accessory drive belt, do not turn on the air conditioner before 10–15 minutes before work.
3. Provide access to the generator. On Murano It is more convenient to work from above, but for lower fastening you may need a jack or inspection hole.
4. Label the wires. Generator on Murano has 3–4 connectors: thick power wire (B+), subtle manager (L) and mass. Use colored sticky notes or duct tape.

Pay special attention drive belt position. On Murano it covers:

• 🔄 Crankshaft pulley
• 🔄 Generator pulley
• 🔄Power steering pulley
• 🔄A/C compressor pulley
• 🔄 Tension and deflection rollers

Take a photo of the belt layout or draw a sketch. This will save time when reassembling. If the belt is worn (cracks, delamination), replace it regardless of the generator state - on Murano it breaks down every 60–80 thousand km.

Step-by-step instructions: how to remove the alternator on a Nissan Murano

The dismantling process differs depending on the generation and engine. Below is a universal instruction suitable for most Murano. For convenience, we will divide it into stages.

Step 1: Removing the Drive Belt

This is the most time consuming step. On Murano with engine VQ35DE The belt is tensioned by an automatic tensioner, and QR25DE - with a hand roller.

1. Loosen the tension roller nut (head 14 mm).
2. Turn the roller clockwise to loosen the belt.
3. Remove the belt from the alternator pulley, and then from the remaining pulleys.

If the belt does not come off, carefully pry it off with a screwdriver, but do not use excessive force - the plastic pulleys are Murano fragile.

Step 2: Disconnecting electrical connectors

Generator on Murano has 2–3 connectors:

• 🔌 Power wire (thick red or black) - secured with a nut 10 mm.
• 🔌 Control connector (white plastic) - fixed with a latch.
• 🔌 Weight (sometimes integrated into the body) - bolt 10 mm.

Disconnect the wires in this order:

1. First, remove the control connector (pull the lock).
2. Unscrew the nut of the power cable and move it to the side.
3. If there is a separate ground bolt, unscrew it.

⚠️ Attention: On Murano Z52 (2015+) the generator may have an additional connector for the system Idling Stop (start-stop). Do not confuse this with the main control wire - it is smaller and usually black.

Stage 3: Dismantling the generator

Generator on Murano attached to 2–3 bolts:

• 🔩 Top bolt - head 12 mm, accessible from above.
• 🔩 Bottom bolt - head 14 mm, an extended ratchet may be required.
• 🔩 Tension bar bolt (if any) - head 10 mm.

Procedure:

1. Unscrew the top bolt on 2–3 turns (no need to remove completely).
2. Unscrew the bottom bolt completely and support the generator with your hand.
3. Carefully pull the generator up, turning it for convenience.

On Murano Z50 (2003–2007) The lower bolt may be hidden under the A/C bracket. In this case, you will have to remove the right headlight or part of the bumper for access.

Common mistakes and how to avoid them

Even experienced car owners make mistakes when removing the generator Murano. Here are the most common ones and how to prevent them:

Error	Consequences	How to avoid
Unscrewing the bolts with the battery on	Short circuit, fuse blown 100A or block IPDM	Always remove battery terminals in order: first –, then +
Using excessive force when removing the belt	Damage to the plastic pulley of the air conditioning compressor (cost: from 8 thousand rubles.)	Use a paddle to pry the belt evenly
Mixed up wires during reassembly	Unstable voltage, error P0562 (low voltage on-board network)	Take photographs of the location of the connectors or label them
Incorrect tightening of generator bolts	Vibration, accelerated wear of the rotor bearing	Tighten with torque 25–30 Nm (for VQ35DE)

Another common problem is jammed bottom bolt. On MuranoWhen used in high humidity conditions, the fasteners rust. To unscrew it:

1. Treat the bolt with penetrating lubricant (WD-40, Liqui Moly MoS2).
2. Wait 10–15 minutes.
3. Use an extended socket wrench 14 mm.
4. If it doesn’t help, heat the bolt with a hair dryer (do not overheat the plastic parts nearby!).

If a bolt breaks, do not try to drill it yourself - contact a service station. On Murano This will require a special extractor and experience working with aluminum blocks.

Diagnostics of a removed generator: what to check

Before installing a new generator or taking your old one in for repair, perform basic diagnostics. This will help confirm the fault and save on unnecessary replacements.

Bearing check

Rotate the generator pulley by hand:

• 🔄 If you hear a crunch or feel a backlash, the bearing is worn out.
• 🔄 If the rotation is tight, corrosion or damage to the windings is possible.

Checking the diode bridge

Use the multimeter in diode test mode:

1. Connect the probes to the diode terminals (between B+ and mass).
2. The polarity should ring in one direction only.
3. If the diodes are broken (sound signal in both directions), the bridge must be replaced.

Checking the windings

Measure the resistance between the rotor slip rings:

• 📊 Norm: 2.3–2.7 Ohm (for Murano with generator 120A).
• 📊 Open circuit or short circuit: 0 ohm or ∞.

If the generator cannot be repaired, choose a new one taking into account:

• 🔹 Recoil current - for Murano with Intelligent Key minimum current 130A.
• 🔹 Polarities - on Nissan "positive" polarity is used (B+ on stiletto heels).
• 🔹 Start-stop compatibility (for Z52).

How to check the voltage regulator without removing the generator?

Connect a multimeter to the battery terminals. Start the engine and turn on the headlights. The voltage must be within 13.8–14.5 V at 2000 rpm. If it is lower 13 V or higher 15 V - the regulator is faulty.

Generator installation and reassembly

Installation of a new generator on Murano is carried out in the reverse order, but there are several critical nuances:

1. Check pulley compatibility. On some generators (for example, Denso) the pulley may differ in diameter or shape of the grooves. Compare the old and new pulleys visually.
2. Apply dielectric grease to the connector contacts. This will prevent oxidation, which is especially important for Murano, operated in winter.
3. Adjust the belt tension. On Murano Z51 With an automatic tensioner, you just need to install the belt and start the engine - the roller will tighten it itself. On Z50 tension is adjusted manually:

• 🔧 The belt slack between the generator and crankshaft pulleys should be 8–10 mm when pressed with a finger.
• 🔧 After adjustment, tighten the tension roller nut to 20–25 Nm.

After installation:

1. Connect the battery (first +, then –).
2. Start the engine and check the voltage at the battery terminals - it should be 13.8–14.5 V.
3. Turn on the maximum load (headlights, air conditioning, heated seats) and make sure the voltage does not drop below 13.5 V.

⚠️ Attention: On Murano Z52 After replacing the generator, it may be necessary to reset the electronic throttle adaptations. To do this:

1. Turn off the engine.
2. Remove the battery terminal at 5 minutes.
3. Plug it back in and start the engine - let it run 1–2 minutes at idle.

FAQ: Frequently asked questions about removing the alternator on a Nissan Murano

Is it possible to remove the alternator on a Murano without a pit or lift?

Yes, but it's more complicated. To access the lower generator mounting bolt on Murano Z51 You can use a jack and a stand under the front. The main thing is to securely fix the car on the handbrake and place chocks under the rear wheels. An alternative is to remove the right headlight (on Z50) or parts of a plastic mudguard.

Which generator is better to choose for replacement: original or analogue?

Original generators Nissan (articles 23100-4M50A, 23100-4M00A) reliable, but expensive (from 25 thousand rubles.). Good analogues:

• Denso (article 210-0506) - high quality, price ~18 thousand rubles..
• Hitachi (article FG00V0001) is the best option for VQ35DE.
• Mitsuba (article AL17X001) - more budget (~12 thousand rubles.), but less durable.

Avoid cheap Chinese generators - they often fail after 20–30 thousand km.

What should I do if, after replacing the generator, the battery light on the dashboard is on?

There are several reasons:

1. Poor contact in the generator connector (check the control wire L).
2. Faulty voltage regulator (even on a new generator).
3. Error in block IPDM - Reset via diagnostic scanner is required (Launch, Delphi).
4. Weak belt tension — check the sag.

Start by checking the voltage at the battery terminals with the engine running. If it is normal (13.8–14.5 V), the problem is in the warning light circuit.

How long does it take to replace an alternator on a Murano?

The time depends on the experience and generation of the car:

• Murano Z50 (2003–2007) — 2–3 hours (due to difficult access to the bottom bolt).
• Murano Z51 (2008–2014) — 1.5–2 hours.
• Murano Z52 (2015–2021) — 2–2.5 hours (additional fastenings to the power steering).

For beginners, the process may take up to 4–5 hours, especially if the bolts are stuck.

Is it possible to drive with a faulty generator if the battery is charged?

Highly not recommended. Even with a fully charged battery:

• 🚗 You risk stalling on the way - the battery will be discharged in 30–60 minutes driving with the headlights on.
• 🚗 Electronics (for example, ESP or ABS) may not work correctly.
• 🚗 On Murano Z52 system Idling Stop will turn off, which will increase fuel consumption.

If the generator fails on the road, turn off all unnecessary consumers (music, heating) and drive to the repair site at minimum speed.