DTC codes / Mazda codes / P1693
P1693 on a Mazda indicates that the powertrain control module has detected an electrical fault in the turbocharger boost control circuit, which typically involves the solenoid or actuator that regulates boost pressure. The computer monitors the circuit for open or short conditions and sets this code when the signal does not match expected values during key-on or running tests.
Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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