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