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:
- PCM damaged.
- PSP circuit open or shorted to SIG RTN.
- PSP switch/shorting bar damaged.
- SIG RTN circuit open or shorted to GND.