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:
- Damaged PCM (DTCs P1518, P1519, P1520, P1537 or P1538).
- Damaged IMSC solenoid valve (DTCs P1518, P1519, P1537 or P1538).
- IMSC control circuit open (DTCs P1519 or P1520).
- IMSC circuit open (DTCs P1519 or P1520).
- IMSC monitor circuit short to VREF (DTC P1519).
- IMSC monitor return circuit open (DTC P1519).
- IMSC monitor signal circuit shorted to ground or SIG RTN (DTCs P1518, P1537 or P1538).
- IMSC VPWR circuit open (DTC P1519).