The 2.0L engine, in uSA? (6 engine world wide even k11/12)
egr tests and steps, and cleaning or extensive
the valve must not stick
the total path not blocked. end to end.
488s may mean just that.
it's a 5 wire motor driven EGR valve
clean it first
some will reset and cycle key on, off.
use that trick to clean it, and see if it works.
many newer cars the EGR has a read back device, direct. it has variable resistor in the main valve, that tells the PCM that the valve moved to the correct spot.
if this fails, the valve is stuck.
reading up on 488s, tells you what the test does.
i dont have that book,
if the motor works and is not stuck then the path is blocked,
the exhaust path, this can be a small horror to cure.
once you do one, then 2nd will not be fun.
after you look like a carbon covered monkey.
Some take a full weekend to do at home.
see these 5 pins on back of main egr.
there is a motor there, but one pin might be
egr feed back sensor. not sure.
, one way to test it. is to unscrew it.
and clean it then cycle the key connected
and look inside to see if it moves inside.
the ECU resets it and at key on, you can watch it.
if it seems to work ok,, the path is blocked, sorry
EGR Vacuum Regulator Solenoid
The EGR vacuum regulator solenoid (Figure 88) is an electromagnetic device which is used to regulate the vacuum supply to the EGR valve. The solenoid contains a coil which magnetically controls the position of a disc to regulate the vacuum. As the duty cycle to the coil increases, the vacuum signal passed through the solenoid to the EGR valve also increases. Vacuum not directed to the EGR valve is vented through the solenoid vent to atmosphere. Note that at 0% duty cycle (no electrical signal applied), the EGR vacuum regulator solenoid allows some vacuum to pass, but not enough to open the EGR valve. 
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