DTC P1408: EGR Flow Out of Self-Test Range (Non-MIL)
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P1408 - EGR FLOW OUT OF SELF-TEST RANGE (NON-MIL)
| 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 fails and the DTC is output when the measured EGR flow falls above or below the required calibration. | ||
| Possible Causes: | |||
| Diagnostic Aids: | For electric EGR, use the output state control function of the diagnostic tool and monitor the MAP PID (MAP) and the EEGR PID (EGRMDSD) while commanding the EEGR on. If EGR is introduced into the engine at idle, the RPM will drop or stall out. For vacuum systems see diagnostic aids for P0401 . |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Vehicles With an Electric EGR (EEGR) | - | GO to KD: Electric Exhaust Gas Recirculation (EEGR) System STEP KD8. | - |
| Vehicles with an EGR system module (ESM) | - | GO to HH: Exhaust Gas Recirculation System Module (ESM) STEP HH16. | - |
| All others | - | GO to HE: Exhaust Gas Recirculation (EGR) Systems STEP HE36. | - |