DTC P1408: Exhaust Gas RECIRCULATION (EGR) Flow Out Of Self-Test Range

P1408 - EXHAUST GAS RECIRCULATION (EGR) FLOW OUT OF SELF-TEST RANGE

Description: This test is carried out during the key ON engine running (KOER) on demand self-test only. The EGR system is commanded on at a fixed engine speed. The test does not pass and this DTC sets when the measured EGR flow falls above or below the required calibration.
Possible Causes: For electric EGR (EEGR) system, see possible causes for DTC P0400 in P0400 - EXHAUST GAS RECIRCULATION (EGR) FLOW . For vacuum activated systems, see the possible causes for DTC P0401 in P0401 - EXHAUST GAS RECIRCULATION (EGR) FLOW INSUFFICIENT DETECTED .
Diagnostic Aids: For EEGR, use the output state control function of the scan tool and monitor the manifold absolute pressure (MAP) PID and the EEGR PID (EGRMDSD) while commanding the EEGR on. If EGR is introduced into the engine at idle, the RPM drops or stalls out. For vacuum systems see diagnostic aids for DTC P0401 .
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Escape, Fusion 2.5L, Fusion 3.0L, Transit Connect	GO to PINPOINT TEST KD .
E-Series 4.6L, Mustang 5.4L	GO to PINPOINT TEST HH .