Possible Causes
WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- DPFEGR SIG shorted to GND (P1400).
- DPFEGR SIG open (P1401).
- DPFEGR SIG shorted to PWR (P1401).
- VREF shorted to PWR (P1401).
- VREF shorted to GND (P1400).
- SIG RTN open (P1401).
- Damaged DPFEGR sensor (P1400 or P1401).
- Damaged PCM (P1400 or P1401).