The given code appears to be a pseudocode for computing the sum of the product of each element in array 'a' with itself. Here is the corrected version of the pseudocode:

Sum := 0;
for i := 1 to 4 do
Sum := Sum + a[i] * a[i];
End for;

This code snippet computes the sum by iterating over each element in the array 'a' and adding the square of each element to the sum.