Possible Causes
WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Vacuum supply.
- EGR valve stuck closed.
- EGR valve leaks vacuum.
- EGR flow path restricted.
- EGRVR circuit shorted to power.
- VREF open to DPFEGR sensor.
- DPFEGR sensor downstream hose off or plugged.
- EGRVR circuit open to PCM.
- VPWR open to EGRVR solenoid.
- DPFEGR sensor hoses both off.
- DPFEGR sensor hoses reversed.
- Damaged EGR orifice tube.
- Damaged EGRVR solenoid.
- Damaged PCM.