This is from the ALLDATA Repair website: (The shop burned me a copy, so don't ask for the link)
Step 5:
1) Disconnect the EGR harness connector.
2) Ignition "ON".
3) At the EGR valve, use a DVM to check the voltage at the 5 volt reference wire (RED) and ground (B).
-- Values 4-6V (mine was 5.0)
Step 6:
1) Disconnect the EGR harness connector.
2) Measure resistance between terminal B and D.
-- Values 5-5.5 KOhm (mine was 5.09K)
Step 10:
1) Disconnect the EGR harness connector.
2) Use an ohmmeter to measure between the pintle position pin (C) and the sensor ground pin (B) on the EGR valve.
-- Values 1 to 1.25 KOhm. (mine was 1.6K, causing P0405 code)
Gregg
2001 Proton Yellow #1379