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Code 46: (Solenoid Valve - Charge Relief Control)

WARNING: This page is about a different car, the 1994 Mazda RX-7. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Trouble Code No. 46 Diagnostic Chart (Solenoid Valve - Charge Relief Control)
G93C80665
Fig 2: Trouble Code No. 46 Schematic (Solenoid Valve - Charge Relief Control)
G93D80666