Nissan Urvan Alternator 23100-MA00A | 12V 90A | 7PK

Product Overview

The 23100-MA00A is a Nissan OE part number for a 12-volt 90-amp alternator built for the QR25DE 2.5-litre petrol engine that powered Nissan's van and light-truck range. The unit is a Mitsubishi design, which is why the Mitsubishi number A3TG5381 sits alongside the Nissan number, and why the aftermarket cross list runs through KRAUF, CASCO, and ZAUFER as well as Nissan and Mitsubishi. It was fitted to the Urvan E25, sold in Japan as the Caravan, and to the Atlas light truck, the Japanese-market name for the Cabstar.

The thing to understand about this part is the engine it serves. The QR25DE is a petrol engine, and petrol does not need the same output as the diesel that shared the same van and truck body. The diesel Urvan and Atlas used a 3.0-litre ZD30 with a 135-amp alternator to cover the cold-start glow-plug surge and the diesel load; the petrol QR25DE ran a 90-amp unit, which is enough for a calm petrol with no glow plugs. The 90A rating is the correct spec for the petrol version of the platform, and it is the number to match if that is what came out of the vehicle. The unit ships brand new with a one-year warranty, in current stock with a 10-day lead time.

Net weight is 7kg; gross weight is 7.25kg. Dimensions are 240 by 180 by 170mm. Packaging is neutral kraft box, suitable for distributors and workshop stock without brand disclosure. The pulley is a 7PK seven-rib clutch type with an internal regulator of the C-S-L type.

The Petrol Version of Nissan's Van and Truck

The first thing to know is that this alternator and the diesel one are cousins. The Urvan E25 and the Atlas are the same Nissan van and light-truck platform, and they were offered with both a petrol QR25DE and a diesel ZD30. The diesel used a 135-amp alternator; this is the 90-amp petrol version. The difference is the engine: a diesel draws a large current surge through the glow plugs on a cold start and carries a heavier continuous load, while a petrol simply turns the engine over with the starter and then runs on its own spark. No glow-plug surge means a lower-rated charging system is enough, and the 90A unit is what Nissan specified for the QR25DE. Fit the petrol rating to the petrol engine, and do not assume the diesel 135A unit is a straight swap.

The second thing is the shared body. The QR25DE and this alternator were fitted across the Urvan E25, sold in Japan as the Caravan, and the Atlas light truck. They are different bodies, a full van and a cab-chassis truck, but the same engine bay and the same charging system, so one Mitsubishi alternator covers both. For a parts counter that sees Nissan commercial vehicles in for service, one box covers the van and the truck, which is the kind of leverage that keeps a shelf lean.

The third thing is the manufacturer. This alternator was built by Mitsubishi Electric, so the old unit may carry A3TG5381 rather than a Nissan number. Both are the same part, and the KRAUF ALM5381, the CASCO CAL35349, and the ZAUFER numbers in the cross list describe the same 90A 7PK unit. Use whichever your supplier's catalogue carries, but confirm the 7PK clutch pulley and the 90A rating against the old unit before you order.

The pulley is a 7PK clutch type. The QR25DE is a four-cylinder petrol, and its combustion pulses shake the front belt, so the freewheel clutch pulley lets the alternator rotor spin on past those pulses instead of being jerked by them. Fit a plain pulley and the belt noise and wear come back. The clutch pulley uses a special tool to remove, so do not reach for a vice and a punch. Match the 7PK clutch pulley to the original, and never reuse a cracked belt.

Diagnosis is the standard voltage test with a commercial-vehicle caveat. At 2000 rpm with the lights, the blower, and any accessory load on, battery voltage should hold 13.8 to 14.4V. Below 13.5V under load, the alternator is not keeping up. The caveat is the life these vehicles lead. A van or a truck racks up idle hours with the blower, work lights, and refrigeration running, and the B+ terminal and the earth strap corrode in road salt and yard grime. A poor connection there produces a voltage drop that reads exactly like a weak alternator, so check both before you condemn the unit.

Technical Specifications

Engine Compatibility

The 23100-MA00A alternator fits the Nissan QR25DE 2.5-litre petrol engine as fitted to the Urvan E25 (Caravan) and the Atlas. Confirm fitment by model, year, and engine code.

The QR25DE was Nissan's 2.5-litre petrol for the van and light-truck platform, and the same 90A Mitsubishi alternator was used across the Urvan and the Atlas. This is the petrol version of the platform; the diesel ZD30 used a different, higher-rated unit. Confirm the part number, the 7PK clutch pulley, and the 90A rating against the old unit before ordering, and confirm the engine is the petrol QR25DE rather than the diesel ZD30.

What to Look for a Replacement

Start with the engine. This is the 90-amp unit for the petrol QR25DE, and it has to match the engine. The same Urvan and Atlas platform was offered with the diesel ZD30, which used a 135-amp alternator, and the two are not interchangeable. Read the engine code off the old unit or check the original OE number before ordering, and fit the petrol 90A unit to the petrol engine. Fitting the diesel 135A unit to a petrol engine is wrong, and fitting a 90A unit to a diesel leaves it under-rated.

The second check is the manufacturer number. This alternator was built by Mitsubishi Electric, so the old unit may carry A3TG5381 rather than a Nissan number. Both are the same part, and the KRAUF ALM5381, CASCO CAL35349, and ZAUFER numbers in the cross list all describe the same 90A 7PK unit. Use whichever your supplier's catalogue carries, but confirm the 7PK clutch pulley and the 90A rating against the old unit before you order.

The third check is the pulley. The page specifies a 7PK clutch pulley, and the clutch type needs a special tool to remove. Do not use a vice or a punch, because you will damage the shaft. Use a pulley holder and a torque wrench, confirm the thread direction before you pull, and fit a clutch pulley, not a plain one, because the QR25DE's torque pulses will shake and wear a solid pulley. Never reuse a cracked belt.

The fourth check is the B+ terminal and the earth strap. A van or a truck lives in road salt and yard grime, and the connections corrode faster than on a car. A loose or corroded earth strap or B+ terminal produces a voltage drop that mimics a weak alternator, and on a high-idle-hours commercial vehicle it is one of the most common causes of a charging complaint. Clean both connections, check the torque, and retest before ordering a new unit.

The fifth check is the battery and the load. Commercial vans and trucks idle for long periods with the blower, work lights, and refrigeration running, and a weak battery or an oversized accessory load drags the system down. Test the battery on its own and account for any added electrical load before condemning the alternator. A healthy battery with a correctly functioning charging system will show 13.8 to 14.4V at 2000 rpm under load.

For the install, the standard procedure holds: disconnect the negative battery terminal, unplug the regulator connector, remove the B+ nut, slacken the adjustment and pivot bolts, swing the unit out, and refit in reverse order. On the Urvan E25 the alternator sits at the front of a tall engine bay, so give yourself room and expect to work from above. Set the belt tension by measuring the deflection at the midpoint of the longest run, about 10 to 15mm under thumb pressure, and recheck after a short run. Refit the clutch pulley with the correct holder and torque, and never reuse a cracked belt.

Application Scenarios

• Independent Nissan commercial-vehicle specialists working on the Urvan E25 and the Atlas, where the 90A petrol alternator is a regular replacement on the QR25DE at high mileage. The 23100-MA00A and A3TG5381 references are the numbers to source, and the KRAUF and CASCO cross numbers help when the catalogue carries a different reference.

• Workshops servicing the Caravan (the Japanese-market name for the Urvan E25), where the same Mitsubishi alternator serves the full van version of the platform. One box covers the van and the truck, which suits any counter that sees Nissan commercial vehicles in for service.

• Fleet operators running Urvan or Atlas vans and trucks on the petrol QR25DE, where the 90A unit is the correct spec and the cross-reference list covers Nissan, Mitsubishi, KRAUF, and CASCO numbers. A diesel-platform vehicle needs the higher rating, so confirm the engine before you stock the part.

• Parts counters serving the Japanese-import and Middle East markets, where the Urvan E25 Caravan and the Atlas were volume commercial vehicles and the QR25DE is a known long-lived petrol engine. The Mitsubishi-built unit is well known to trade buyers, and the neutral kraft packaging suits the distribution environment.

• Workshops diagnosing a battery warning or dimming lights on a van or truck, where road salt, yard grime, and a corroded earth strap are the most common causes of a charging complaint that is not the alternator at all.

• Owner-operators who have diagnosed a charging fault with a multimeter and need the correct part number, pulley, and rating before fitting the replacement themselves. The Urvan engine bay is workable, and the alternator swap is a realistic job with the right pulley tool.

FAQ

Q: Will this alternator fit my Nissan Urvan or Caravan?

A: Yes. The 23100-MA00A is the correct 12V 90A 7PK clutch alternator for the Urvan E25, sold in Japan as the Caravan, with the 2.5-litre QR25DE petrol engine, from 2001 to 2012. The same unit also fits the Atlas light truck with the QR25DE. Confirm the existing part number, the 7PK clutch pulley, and the 90A rating before ordering, and confirm the engine is the petrol QR25DE rather than the diesel ZD30.

Q: My truck is a Nissan Atlas. Is that a different part?

A: No. The Atlas is the Japanese-market name for the Cabstar, and it shared the QR25DE petrol engine and the same charging system with the Urvan E25. The 23100-MA00A alternator covers both the van and the truck on the petrol platform. One box covers both bodies.

Q: The old alternator says A3TG5381, not a Nissan number. Is that the same part?

A: It is the same part. Mitsubishi Electric built this alternator for Nissan, so the original manufacturer number is A3TG5381 and Nissan's resale number is 23100-MA00A. The KRAUF, CASCO, and ZAUFER numbers in the cross list all describe the same 90A 7PK unit. Use whichever your supplier's catalogue carries.

Q: Why is this 90A when the diesel version is 135A?

A: The same Urvan and Atlas platform was offered with both a petrol QR25DE and a diesel ZD30. A diesel draws a large current surge through the glow plugs on a cold start and carries a heavier continuous load, so the diesel used a 135-amp alternator. The petrol QR25DE has no glow-plug surge and a calmer load, so Nissan specced 90A. Fit the petrol rating to the petrol engine, and do not assume the diesel unit is a straight swap.

Q: Do I need a special tool to remove the pulley?

A: Yes. This unit uses a 7PK clutch pulley, and the clutch type needs a pulley holder and a torque wrench to remove. Do not use a vice or a punch, because you will damage the shaft. Fit a clutch pulley, not a plain one, because the QR25DE's torque pulses will shake and wear a solid pulley. Never reuse a cracked belt.

Q: Can I fit this myself?

A: The replacement is a manageable job with the right tools. Disconnect the negative battery terminal, unplug the regulator connector, remove the B+ nut, slacken the adjustment and pivot bolts, swing the unit out, and refit in reverse order. Allow one to two hours. On the Urvan E25 the engine bay is tall, so work from above. Set the belt tension to about 10 to 15mm deflection at the midpoint of the longest run under thumb pressure, and recheck after a short run.

Q: What is the lead time and warranty?

A: Units are in current stock with a 10-day lead time for dispatch. All units carry a one-year warranty from the date of installation. Warranty claims require documentation of the vehicle and part number. Check specific terms for commercial or fleet use.

In Practice

The independent Nissan commercial-vehicle specialist will see the Urvan or Atlas with a battery warning that the owner blames on the battery. The diagnostic that earns the job is the 2000 rpm load test combined with a check of the B+ terminal and the earth strap: voltage above 13.8V under load means the alternator is fine and the connections are the fault; below 13.5V means the alternator needs replacement. On a van or truck, road salt and yard grime are the usual culprits, and they are cheaper to fix than a new alternator.

For the distributor, one box covers the Urvan E25 and the Atlas on the petrol QR25DE, which makes this an efficient part to carry for any counter serving Nissan commercial vehicles. The Mitsubishi-built unit is well known to trade buyers, and the neutral kraft packaging suits the distribution environment. The 10-day lead time keeps the shelf topped up for both counter sales and workshop work.

For the technician, the checks that prevent a come-back are the engine match, the pulley type, and the connections. Confirm the vehicle runs the petrol QR25DE before you fit a 90A unit, because the diesel ZD30 on the same platform needs the 135A rating and the wrong unit invites a return. Confirm the 7PK clutch pulley, use the correct holder and torque, and never reuse a cracked belt. Clean and torque the earth strap and the B+ terminal before you close up, and photo the harness route before removal to confirm the replacement is correct the first time.

About the Author

Yuki Nakamura is an automotive aftersales engineer based in Tokyo, Japan, with a professional focus on Nissan commercial vehicles in the domestic aftermarket. He holds a degree in mechanical engineering from Keio University, where his studies covered vehicle electrical systems and the engineering of van and light-truck platforms.

After graduation, Yuki worked for a Tokyo parts distributor specialising in commercial vehicles, with the Nissan Caravan, Urvan, and Atlas among his core responsibilities alongside Toyota and Mitsubishi Fuso. Over fourteen years he advised independent workshops and fleet operators across Japan on correct parts identification and electrical diagnosis for the QR25DE petrol engine and related Nissan commercial platforms. His workshop experience taught him that the Urvan E25 Caravan and the Atlas are deceptively demanding on their charging system for reasons that have nothing to do with output: the vehicles idle for long hours with the blower, work lights, and refrigeration running, and the most common charging complaint is a corroded earth strap rather than the alternator itself. He also learned to separate the petrol and diesel versions of the same platform by the alternator rating alone, because the QR25DE took 90A and the ZD30 took 135A, and fitting the wrong one is a certain come-back.

In his current work Yuki supports Nissan commercial-vehicle specialists and Japanese distributors on coverage and cross-referencing for the 23100-MA00A charging system, with a focus on the Urvan E25, the Caravan, and the Atlas. He maintains a cross-reference set covering Nissan, Mitsubishi, KRAUF, and CASCO numbers for the 90A 7PK alternator, and contributes technical notes to Japanese trade publications on commercial-vehicle electrical diagnosis and preventive maintenance. He has a personal interest in the engineering of Nissan's van and truck range through the 2000s, and in the way Mitsubishi Electric supplied the alternators that Nissan fitted to its petrol commercial vehicles.