Possible Causes
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Connector or terminal malfunction
- ECT sensor malfunction
- Short to ground circuit between ECT sensor 2-pin harness connector terminal "A" (White/Blue wire) and PCM 104-pin harness connector terminal No. 38 (Light Green/Black wire)
- Short between ECT sensor harness connector terminals "A" (White/Blue wire) and "B" (Brown/Green wire)
- PCM malfunction