Detection Condition

• DTC P1400 indicates average voltage of DPFEGR SIG circuit input is less than the minimum of 0.2 volt.
• DTC P1401 indicates average voltage of DPFEGR SIG circuit input is more than the maximum of 4.5 volts.

DPFEGR sensor measures actual pressure drop across the metering orifice and relays a proportional voltage signal (0-5 volts) to PCM.