HE100 - Check For EGR Flow - EGR Hose Disconnected and Plugged

NOTE: Perform KOER Self-Test and service any DTCs before proceeding with this test.

The symptom flowcharts have indicated possible EGR flow at idle with no EGR Diagnostic Trouble Codes output.

Possible Causes:
- EGR valve not fully seating.
- EVR solenoid vent restricted.
- Damaged EVR solenoid.

- Disconnect vacuum hose at EGR valve and plug hose.

- Key On, Engine Off.

- Access DPFE PID with a Scan Tool and note voltage.

NOTE: DPFE sensor Input with no EGR flow is 0.45 volt ± 0.25 volt.

- Start engine and bring to idle.

- With engine at idle, look at the DPFE PID voltage and compare to the Engine Off reading. An increase in the voltage at idle indicates that the DPFE sensor is sensing EGR flow.

- Is the DPFE PID voltage greater at idle by a minimum of 0.15 volts than with the Engine Off?

YES -- The DPFE PID voltage is indicating EGR flow at idle. Since the EGR vacuum hose is disconnected and plugged, the fault is most likely in the EGR valve. REMOVE and INSPECT the EGR valve for signs of contamination, unusual wear, carbon deposits binding and other damage. SERVICE as necessary (use Rotunda EGR Valve Cleaner 021-00056, if needed). RECONNECT all components. RE-EVALUATE symptom.

NO -- This indicates a fault in the EGR valve vacuum supply. INSPECT the EVR solenoid vent and vent filter for restrictions. SERVICE as necessary. If OK, REPLACE EVR solenoid. RE-EVALUATE symptom.