Here's a couple links that may help understand the Pension Adjustment - Box 52. Many people are confused about the affect of this Box 52 on the actual tax return itself, of which there is none.
"You are required to report this amount on line 206 of your income tax return. This amount does not affect your income, either as earnings or as a deduction, but it can lower how much you can contribute to your Registered Retirement Savings Plan in the following year."
Your pension adjustment is calculated using a formula set by the federal government, and reported in TurboTax in the same way as any tax software would. The pension adjustment represents the value of the pension benefit earned in your pension plan for a given year.