1-is that a good car means powerful engine and body wise?
Yes it is powerful as compared to 1300cc petrol engine cars.
2-i heard mostly 2od,s had done (hisa) work??
I have never heard and not experienced this. This only happens to those cars which have their engines changed or are converted from petrol to diesel.
3-wts the fuel consumption of new born engine per liter in city and on long routs??
Toyota Indus Motors claims that a new corolla gives a fuel to distance average of 16 Kilometers per liter (16 Km/Ltr) and this claim is very much true. I have Indus shape Corolla 2.0D (2000 Model) and it gives me an average of 16 Km/Ltr in city and about 17-18 Km/Ltr on long route. And my car is driven about 260,000 Kms without engine overhaul.
4-i also heard allmost 2.OD gots heatup..
No, they don't heatup unless the coolant in the radiator has dried up or cooling fans are not working. Usually in Pakistan mechanics take out thermostat from the cars which leads to the heatup problem.
5-my daily travelling 30 or 40 km only in city so pls suggest me that can i go for 2.od or not??
It all depends on your need and your budget. Corolla 2.0D have a little low resale value than Corolla petrol versions. But it has advantages over petrol cars .i.e. fuel economy, hassle free (no tuning required), less fuel fill ups. And as compared to CNG, CNG is a little cheaper but you dont get enough boot space in CNG cars. So final words if you prefer fuel economy go for a CNG otherwise 2.0D.
Maintenance
As far as maintenance of 2.0D is concerned it only requires oil filter and oil change after every 5000 Kms and air filter needs to be cleaned atleast twice every month or as required (depends on the use of car and condition of the filter). Engine needs to be overhauled when fuel average starts reducing and engine oil dries up completely before 5000 Kms.
Noise
Diesel engine produces some noise and some people find it annoying but that can be reduced by sound proofing. I haven't seen any sound proofing in latest produced 2.0Ds but the old Indus shape 2.0Ds engine bay is sound proofed and sound proofing can easily be done.
Starting Problem
2.0D have starting problem only when the battery or heating plugs are weak. I remember i last bought the battery 2 years ago (in 2008) (heaters are more than 3-4 years old) and it never gave me any starting problem to date and I turn off the engine at every red signal and start it again on green (means i turn off and on the engine a lot).