HE70 - DTC 1407: Run KOER Self-Test

Diagnostic Trouble Code (DTC) 1407 indicates that continuous self-test has detected no EGR flow.

NOTE: If the fault is currently present, DTC 1408 will be output in Key On Engine Running (KOER) Self-Test.

Possible Causes:
- EGR valve stuck closed or iced.
- EGR valve diaphragm leaks.
- EGR flow path restricted.
- EGR vacuum hose off, plugged or leaks.
- EVR VPWR circuit open.
- EVR circuit to PCM open.
- EVR circuit to PCM shorted to PWR.
- DPFE sensor pressure hoses both off.
- DPFE sensor VREF circuit open.
- Damaged EVR solenoid.
- Damaged DPFE sensor.
- Damaged PCM.

- Run KOER Self-Test.

- Is KOER DTC 1408 output?

YES -- The KOER Self-Test has detected an EGR fault that is currently present. GO to HE71. HE71 - DTC 1408: Output Continuous Memory DTCs

NO -- The fault that produced DTC 1407 is intermittent. GO to HE90. HE90 - Inspect EGR System For an Intermittent Failure