Yes, sounds like relay 109. In my early T4 days I was talking to another owner in a caravan park & he carried the 109 in his travelling kit after reading about it on the forums. Here's a link for some reading from the T4 forum. His is the AJT where as yours will be the ACV or AUF.
Trouble shooting tips on relay 109 engine not starting - VW T4 Forum - VW T5 Forum
Understand how it works, troubleshoot logically BEFORE replacing parts.
2001 T4 TRAKKA Syncro 2.5TDI,2006 Mk5 2.0TDI Golf manual,2001 Polo 1.4 16V manual [now sold], '09 2.0CR TDI Tiguan manual,
Numerous Mk1 Golf diesels
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