120 ohms means there is only 1 terminator, and 40 or less means there are too many terminators on the bus. Your network should measure 60 ohms when resistance tested. Total Network length does not exceed 100m for Lite cable and 250m for Mid / Heavy cable.Network is correctly grounded at only one point.Network is correctly terminated (2 terminators max).Total current draw from network does not exceed power supply limits.The type of issue can be used to narrow down the range of tests done if you have the knowledge to do so, but otherwise, here are the common things to check: There are several things to test on an NMEA 2000 network if you are experiencing issues.
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