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:

Both CMP sensor wires are shorted to each other
CKP sensor pulse wheel malfunction
CMP sensor is dirty
CMP sensor malfunction
Connector or terminal malfunction
Open circuit between CMP sensor harness connector terminal "A" and PCM 30-pin harness connector terminal "2M"
Open circuit between CMP sensor harness connector terminal "B" and PCM 30-pin harness connector terminal "2J"
Short to power circuit between CMP sensor harness connector terminal "A" and PCM 30-pin harness connector terminal "2M"
Short to power circuit between CMP sensor harness connector terminal "B" and PCM 30-pin harness connector terminal "2J"
Short to ground circuit between CMP sensor harness connector terminal "A" and PCM 30-pin harness connector terminal "2M"
Short to ground circuit between CMP sensor harness connector terminal "B" and PCM 30-pin harness connector terminal "2J"