P2088 DTC

[zaclaw]

2007 CX-7 AWD Grand Touring. I've been chasing this issue for a while to no avail. After having the engine replaced w/ a brand new OEM long block (w/ turbocharger, VVT actuator & other miscellaneous parts), a P2088 code (camshaft position "A", camshaft shaft position actuator control circuit low, bank 1) appeared. This code appears immediately, even after clearing it. Even before the engine is cranked. Always immediately returns. After a short while, the code is always succeeded by a P0012 code (camshaft position "A", timing over-retarded, bank 1). All steps in the Mazda diagnosis flow chart have been performed.



Experiencing loss of power (especially low-end torque) and poor fuel economy. It seems the intake VVT is not advancing because of the OCV not operating.



Replaced VVT actuator (twice)

Replaced OCV

Replaced PCM (twice)

Checked power circuit for voltage from main relay

Checked ground circuit for resistance from OCV to PCM

Checked connectors for damage/corrosion



No detectable issues with any of the above components. Seemingly no logical reason for this DTC to be triggered.



It appears to be an electrical fault, not mechanical, being that the code returns immediately before even starting the engine. No other related issues with the vehicle. It seems P0012 is caused by the P2088 issue.



Mods:

Mazdaspeed6 long block

Corksport turbocharger

Corksport 3bar MAP sensor

Corksport turbo inlet pipe

Corksport stage II SRI

VersaTune (base tune w/ MAP calibration)