Another garage we help out with some diagnostic work has fitted a new diesel pump to a Zafira Y20DTH and they've asked me to code in new pump.

I have Tech 2 and TIS disc all functioning but the problem is they haven't reset old pump which according to TIS needs to be done 1st.

Anyone give me a run down of what's involved or how to proceed as this is the 1st one i've done.

thanks
lee