Download IF YOU CONFIRM: • DTC P0400 (EGR) or P0402 (EGRC-BPT Valve) is stored in the ECM, and/or • The vehicle exhibits rough running or other drivability incidents, and/or • Difficulty in setting the EGR System Readiness Test (SRT) status to CMPLT. ACTION: Clean the intake manifold EGR ports.SERVICE PROCEDURE 1. Remove the throttle chamber assembly and place it aside. • Refer to the EM section of the appropriate Service Manual (ESM). NOTE: It is not necessary to completely remove the throttle chamber assembly. • Only remove harness connectors, cables, and hoses necessary to allow the throttle chamber assembly to be placed aside. • Throttle chamber coolant hoses do not need to be removed. NOTE: Figure 1 gives a general location of the plugs for the EGR ports, but the plugs are not visible in the photo. 2/4 2. Remove the EGR valve mounting bolts and then move the EGR valve outward about ½ inch (see Figure 2). • This is so you can remove the plug for the “rear most” EGR port. NOTE: You don’t need to completely remove the EGR valve. Rear Most EGR Port.