The compact diesel-powered SUV has also landed a $3000 price cut with the addition of a new $31,990 entry version, although the up-spec diesel Aspire is now $1500 more expensive at $36,490.
The new diesel joins the existing petrol option, which is still available in four two-wheel-drive models and one all-wheel-drive model.
Upgrading to the 2.2 litre diesel hasn't boosted power - offering the same 110kW as the previous 1.8 litre engine - but torque is now up 60Nm to settle at 360Nm between 1500 and 2750rpm.
The official fuel consumption figure has barely budged, rising from 5.7 in the old engine to 5.8 l/100km with the new unit.
The main point of appeal for buyers however will be the new availability of a six-speed automatic transmission in the diesel-powered ASX.
In fact, the manual option has been kept from the new 2.2 diesel models all-together, now available only with the 1.8 diesel - and only until stock runs out.
Both 2.2 diesel models are fitted with Mitsubishi's all-wheel-drive system, offering on-demand traction and a 4WD lock mode.
The ASX is otherwise unchanged mechanically. See more ASX news and reviews here.
Standard features in the entry diesel model include a rearview camera and reversing sensors, along with a 6.1 inch touchscreen, iPod and Bluetooth connectivity (phone and audio streaming), cruise control and keyless entry.
On the outside there's 16-inch alloy wheels, body-coloured door handles, integrated turn signals in the mirrors, and a roof spoiler.
Move up to the top-shelf Aspire diesel and there's leather seats (heated up front, electric for driver), a start button, auto wipers and headlights, and a panoramic glass roof.
Mitsubishi's MMCS display is included inside - previously an optional extra - offering a seven-inch screen and satellite navigation.
Exterior treatment with the Aspire includes 17-inch alloys, fog lights and tinted windows. Metallic paint and the 710w Rockford Fosgate audio system remain optional extras.
With 607 sales in May, the ASX remains one of the more popular models in the small SUV segment, although it was eclipsed that month by the ix35 (1770) and Dualis (1176), and bettered by the Subaru XV (851).
The new auto-equipped diesel could help to boost the ASX's numbers over the coming months.
Pricing (excluding on-road costs)
- 2013 ASX 2WD 2.0 petrol manual - $25,990
- 2013 ASX 2WD 2.0 petrol auto - $28,240
- 2013 ASX 2WD 2.0 petrol Aspire manual - $28,990
- 2013 ASX 2WD 2.0 petrol Aspire auto - $31,240
- 2013 ASX 4WD 2.0 petrol Aspire auto - $34,990
- 2013 ASX 4WD 2.2 DiD auto - $31,990
- 2013 ASX 4WD 2.2 DiD Aspire auto - $36,490