FEC1 and FEE5 Byte Ordering (LSB MSB) in decoding

Hello All, 

This question is regarding FEC1 and FEE5 PGN byte ordering. 

FEC1 is High Resolution Vehicle Distance PGN. 
It has two data:  1. Total Vehicle Distance (Bytes 1 - 4)
                        2. Trip Distance (Bytes 5 - 8 )
Example Frame: 73 35 4A 03 FB 6F 4A 03 

Questions:

1. Now for Data 1 and 2 How the bytes are to be combined for conversion?
   Like 034A3573 or 73354A03?

2. And Same how is it with FEE5 Engine hours data?

3. Also does J1939 has universal byte positioning method applicable to all
PGN or the method varies with    each PGN? 


Thank you in Advance.



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