DTC P0661:00: Notes

DTC P0661:00	Variable intake air solenoid valve circuit low input
DETECTION CONDITION	The PCM monitors the variable intake air solenoid valve control signal. If the PCM turns variable intake air solenoid valve off but voltage still remains low, the PCM determines that variable intake air solenoid valve circuit has malfunction. Diagnostic support note This is a continuous monitor (other). The check engine light does not illuminate. FREEZE FRAME DATA (Mode 2)/Snapshot data is not available. The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	-
POSSIBLE CAUSE	Variable intake air solenoid valve connector or terminals malfunction Short to ground or open circuit in variable intake air solenoid valve power supply circuit Short to ground in wiring harness between ENG BAR 15 A fuse and variable intake air solenoid valve terminal B ENG BAR 15 A fuse malfunction Open circuit in wiring harness between main relay terminal C and variable intake air solenoid valve terminal B Short to ground in wiring harness between variable intake air solenoid valve terminal A and PCM terminal 2J Variable intake air solenoid valve malfunction PCM connector or terminals malfunction Open circuit in wiring harness between variable intake air solenoid valve terminal A and PCM terminal 2J PCM malfunction
Courtesy of MAZDA MOTORS CORP.