Digital EGR Valve
- If an EGR-related code set, see TESTS W/CODES - 3.1L article in this section for diagnosis. Start and allow engine to idle. With engine at normal operating temperature, disconnect digital EGR valve solenoid harness connector.
- Using a 12-volt power source and a fused jumper wire, very quickly energize EGR solenoid No. 1 Light Blue wire terminal on EGR valve. See Fig 1. RPM should drop slightly. Next, energize EGR solenoid No. 2 Brown wire terminal on EGR valve. RPM should drop slightly more than step 1) or engine should idle rough.
- Energize EGR solenoid No. 3 Red wire terminal on EGR valve. RPM should drop more than step 1) or 2) or engine should idle rough or stall. If RPM changes as indicated, EGR is okay. If RPM drop is not as indicated, check for plugged EGR passages or defective digital EGR valve.
NOTE:
For additional testing procedures, refer to TESTS W/CODES - 3.1L
article in this section.