Parts for your 2017 Mitsubishi Asx-Alternator

2017 Mitsubishi ASX alternator: what it does and when to replace it

Technical sources confirm the 2017 Mitsubishi ASX is fitted with an engine‑driven alternator (generator). Mitsubishi Motors Service Manual for RVR/ASX/Outlander Sport (2017MY, Group 54A – Charging), the Mitsubishi ASA electronic parts catalogue (Generator/Alternator assembly listings), and OE supplier catalogues from Denso and Bosch for ASX engines (such as 4A92 and 4B11) all identify an alternator as standard equipment on this model.

On the 2017 ASX, the alternator’s job is to keep the 12‑volt system energised and the battery charged under all driving conditions. It powers headlights, infotainment, HVAC blowers, heated screens and more, while maintaining the battery so it’s ready for the next start. Many variants use an internally regulated, ECU‑monitored unit that can tweak output based on temperature and load, helping fuel economy and electrical stability.

Common signs the alternator needs attention on an ASX include a glowing battery/charge lamp on the cluster, dim or pulsing lights, slow wipers, a whining or rumbling from the alternator area, or a battery that keeps going flat despite being healthy. A quick check across the battery with the engine running should typically show about 13.8–14.6 volts, anything well outside that range points to charging or wiring faults that need diagnosing.

As part of routine servicing, it’s smart to:

• Inspect the drive belt and tensioner for cracks, glazing, fraying or noise, and replace if worn.
• Check battery health and terminals, a weak or corroded battery makes the alternator work harder.
• Listen for bearing noise and check for clutch/freewheel pulley issues where fitted.
• Verify charge voltage under load (lights, rear demister, A/C) and at idle vs. 2,000 rpm.

When replacement is due, matching the alternator to the engine code and regulator type matters. Some ASX engines use “smart charge” communication, so choose a unit that’s compatible with the vehicle’s wiring and control strategy. Quality new or remanufactured units from recognised brands, or genuine Mitsubishi, tend to provide better longevity and cleaner voltage control.

Replacement basics are straightforward for a trained tech: disconnect the negative battery terminal, note belt routing, swap the unit, torque mounting fasteners to spec, refit the belt and confirm charge rate and warning‑lamp behaviour. After fitting, it’s worth performing a battery test and clearing any transient DTCs. With decent care, an ASX alternator can last many years and hundreds of thousands of kilometres, especially if the belt system and battery are kept in good nick.

How many volts should the 2017 ASX show while running?

Most healthy ASX charging systems sit around 13.8–14.6 V at the battery with the engine running. With big loads on or on a cold morning, it may briefly sit a touch higher or lower as the regulator manages output. Consistently below about 13.2 V or above 15.0 V warrants a proper test.

How long does an alternator typically last on a 2017 ASX?

It varies with driving and climate, but many see 150,000–250,000 km. City stop‑start, high electrical loads, a tired battery, or a worn belt/tensioner can shorten lifespan. Regular inspections help pick up issues before they strand the vehicle.

Can the ASX be driven with a failing alternator?

Only for a short distance, and it’s risky. Once the battery’s charge is depleted, the engine can stall and safety systems may drop out. If the charge lamp comes on, minimise electrical load and get the vehicle checked as soon as practical.