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Home >> Mazda >> 1994 >> RX7 2RTR-1308cc 80 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Mileage Calibration Switch >> Description and Operation
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Mileage Calibration Switch: Description and Operation

PURPOSE
Because of unique problems (such as oil injection) associated with controlling rotary engine emissions, Mazda incorporates a secondary air injection system with performance characteristics that vary with vehicle mileage. With switch input, PCME compensates for engine condition changes by altering distribution of secondary air in a manner designed to both reduce emissions and extend service life of components such as catalytic converters and oxygen sensor.

OPERATION

B+: Battery Positive Voltage:




Voltage at PCME terminal (1N) within the first two seconds after the ignition switch is turned to ON.

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