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:
- Open or shorted THTRC circuit.
- Open VPWR circuit.
- Open or shorted thermostat assembly.
- Damaged PCM.