Possible Causes
WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Damaged DPFEGR sensor (P1400 or P1401).
- Damaged PCM (P1400 or P1401).
- DPFEGR SIG open (P1401).
- DPFEGR SIG shorted to GND (P1400).
- DPFEGR SIG shorted to PWR (P1401).
- SIG RTN open (P1401).
- VREF shorted to GND (P1400).
- VREF shorted to PWR (P1401).