Disconnect the EGR
vacuum line at the VSV & apply vacuum with your mighty vac or the like & watch to see if the EGR
valve moves & will hold vacuum.
No need to clean the vacuum lines or the EGR
diaphragm. Use a wire brush on the egr
valve side where the exhaust gasses circulate. Also make sure the line to the intake/throttle body location is clear of carbon.
Apply vacuum to the VSV to see if it'll hold, or is leaking, as it's normally closed unless the computer sends an electrical pulse to the VSV to open its vacuum switching valve.
sensor is a common problem part, especially if the engine uses oil, so if the engine is using oil, check its exhaust manafold line from below the EGR
valve to the DPFE
sensor, to see if its blocked with carbon.
Could be on the tranny code if your scantool doesn't have a test for it. If your going through a vehicle self test using the CEL
, maybe try switching the OD
off during the KOEO