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Code 27: (Metering Oil Pump)

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. 27 Diagnostic Chart (Metering Oil Pump)
G93H80637
Fig 2: Trouble Code No. 27 Schematic (Metering Oil Pump)
G93B80631