Your code looks mostly correct, but there are a few minor errors and improvements that can be made:
1. In the main module, when calling the `checkInput()` subroutine, you need to pass the `fatGrams` and `calories` variables as arguments. So the line should be: `call checkInput(fatGrams, calories)`.
2. In the `checkInput()` subroutine, you need to continue taking input from the user until valid values are entered. So you should use a loop instead of a single `while` statement. You can use a `do...while` loop or a `repeat...until` loop.
3. Inside the loop in the `checkInput()` subroutine, you need to prompt the user for input again after displaying the error message. So you should include the `Input` statements inside the loop.
Here is the modified code:
```pseudocode
Declare Real fatGrams, percentCal, calories
Module main()
Display "Enter the number of fat grams."
Input fatGrams
Display "Enter the number of calories."
Input calories
Call checkInput(fatGrams, calories)
Set percentCal = calc(fatGrams, calories)
If percentCal < 0.3 Then
Display "The percentage of calories from fat is", percentCal, ". This food is low in fat."
Else
Display "The percentage of calories from fat is", percentCal
End If
End Module
Module checkInput(Real fatGrams, Real calories)
While fatGrams <= 0 or calories <= 0
Display "You must enter a value greater than 0 for the number of fat grams and calories."
Display "Enter the number of fat grams."
Input fatGrams
Display "Enter the number of calories."
Input calories
End While
While calories > fatGrams * 9
Display "The number of calories cannot exceed fat grams times 9."
Display "Enter the number of calories."
Input calories
End While
End Module
Function calc(Real num1, Real num2)
Declare Real result
Set result = (num1 * 9) / num2
Return result
End Function
```
With these modifications, your code should work correctly and handle the input validation as required.