I have a 1998 Mitsubishi Diamante ES with Check Engine Light. Code is P1400, no other codes. Replaced Manifold Pressure Sensor, cleared codes and re-tested. Light came back on. Check vacuum hoses, connections etc. All look good. Car does not pass following self test for emissions: heated o2 sensor, evap test, purge valve test, catalyst test. all these test show incomplete. Other tests pass. What could it be. Other possible tests and what does the code P1400 mean specifically for this car? Will include bonus if you can lead me to answer. Not a dead beat or negative feedback customer.
That code is for DPFE circuit low input. The reason why the other monitors have not run, is because they are being blocked until the other repairs are made. So we need to check the passages for EGR to be cleaned and that the system is electrically working. It may be a defective computer as well or need to be re-flashed.