RX7 2RTR-1308cc 1.3L MFI (1991)
Fluid Pressure Sensor/Switch: Description and Operation
The Oil Pressure Switch is mounted on the transmission in a position to detect fluid pressure changes occurring when the unit is operating in overdrive.
When the switch detects overdrive engaged, a signal is sent to the ECU that is factored into calculations for outputs such as fuel injection quantity,
ignition timing and secondary air injection.
This switch directly affects ECU control of the air injection system split air solenoid. When the vehicle is operating in overdrive, the solenoid valve is
energized, directing secondary air from the air control valve to the rear catalytic converter under specified driving conditions.
Oil pressure switch input voltage is received at ECU terminal 1T. With the vehicle operating in overdrive, terminal voltage should be below 2.0V. In
other ranges, it should be approximately 12V. Note that these readings will only occur as the vehicle is being driven under specified conditions.
