The reason, according to a senior Isuzu executive, is that re-engineering the 4JA1 for a cab and chassis model such as the Traviz is far simpler and very cost effective thanks to the largely exposed frame. Installing the same engine in the Isuzu Crosswind's frame isn't as simple as just bolting it on, as Isuzu engineers would have to literally re-engineer the new power unit to not only work, but to be viable for series production. And that includes all the complexities of the wiring.
"Right now there are no plans for the revival of Crosswind," said the Isuzu executive who knows the importance of a Crosswind model in a developing market such as the Philippines. "I actually asked Isuzu [Japan HQ] if there are plans, but they said no."
We do know that Isuzu had once mulled the idea of putting the 2.5-liter D-Max engine (the 4JK1) in the Crosswind, but that concept didn't work given that they didn't think the frame could handle the torque of the new generation engine.
Isuzu, it seems, has already moved past having an MPV or AUV like the Crosswind. There is no word in the interwebs -rumors or otherwise- about a new generation MPV/AUV like the Innova being developed, though we think it's unlikely too.