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Home >> Jaguar >> 1978 >> XJ-S >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Supplemental Controls >> Description >> Gearbox Pressure Switch
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Gearbox Pressure Switch

This switch opens in response to rising automatic transmission governor pressure and operates the solenoid valve, depending upon coolant temperature, when vehicle speed rises to approximately 35 MPH.

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