Change sparkplugs on NP200 - Cars & Trucks

https://www.fixya.com/cars/t27137815-nissan_np200_dci_1_5_location_1_fuse

https://www.google.com/search?q=2019+Nissan+NP200+Diesel%2C+radiator+fan+relay+location

and Coolant Temperature Sensor

https://www.google.com/search?q=2019+nissan+np200+diesel+coolant+temperature+sensor+location

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Check your gear linkage cables. One may have broken.

https://www.google.com/search?q=manual+nissan+np200+gear+linkage

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Question edited for clarity.

Two things spring to mind.

New ECMs normally need programming to the vehicle with VIN Number and mileage.

A new ECM means you have to reset the anti-theft system.

https://www.google.com/search?q=nissan+np200+immobiliser+reset

https://www.google.com/search?q=nissan+np200+replace+ecm+and+programming

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Finding it is the difficult part. It appears to be inside the fuel tank.

https://www.google.com/search?q=Nissan+NP200.+change+fuel+filter

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You are at the wrong stroke on the 4 stroke engine. You have to be at TDC on the COMPRESSION stroke. You are at inlet or exhaust stoke TDC :>)

There's a website that has all this information about all this and manuals everything totally free there are many actually but I personally like few like.. reliable-store .. let me know if u need help
thanks

Hi Kevin.
see if this link helps you.
Timing marks on nissan np200 1 6 8valve Google Search
or this one.
Timing marks on nissan np200 1 6 8valve Google Search

Need the torque settings for a nissan np200 8valve silinder head

#1 if your engine light is on, you need to go to autozone and have it scanned. if you get code po420 or po430, your cat. converter is bad. If this is the code also should change spark plugs. Misfire causes cat. converter to melt inside.

Have you tried following the fuel lines, that should lead right to it.