Do Fiat still make their own engines?

Yes - Fiat contributed diesels to the alliance with GM, to form Powertrain - when the GM/Fiat alliance was dissolved, Fiat regained control of Powertrain but GM continued using the Powertrain (ex-Fiat) diesels but are now changing to in-house GM diesels.

Fiat also own 50% of VM Motori and are about to buy the remaining 50% from GM.

The Fiat Chrysler group will use both VM Motori and Fiat diesels.

Do Fiat still make their own engines?

Toyota/Lexus make their own diesels? Do they makae their own diesels for the vans?

Are Honda still developing their own diesels? 2.2 and a 1.6?

Yes Honda develop and build their own diesels in the UK at Swindon, both the existing 2.2 and the new 1.6.

Surley, aside from the manufacture of the block, pistons and crankshaft. etc

A lot of diesel engine development is down to Bosch/Delphi/Ricardo etc who provide the technological developments and injection components.

And common sence would suggest a move towards "modular" construction.

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The Volvo 5-cylinder diesels are derived from the Audi 5-cyl engine originally.

Volvo used the Audi 2.5 5-cyl diesel until 2001, when Volvo introduced its own D5. Although the Audi & Volvo motors have the same cylinder bore, the Volvo motor has a shorter stroke giving lower capacity and is all-aluminium, whereas the Audi is iron-block