Yes, there are test procedures to further diagnose pin 14 code 2. These procedures are not described on the service CD, they might be described in the WIS but I don't have WIS so I'm not sure. If you subscribe to AllData, the information is available there.

I went through some of these procedures when I was working this same problem. The test procedures are pretty involved and require some special connectors (or a lot of fiddling with jumper wires...) that allow you to tap into the electrical harnesses/modules associated with the TA. The information that AllData provides describes the tests but does not include much background explanation. Bottom line: Not a very DIY friendly process.

J. M. van Swaay

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles