Sensors & Switches

PCM/TCM controls converter clutch lock-up, upshifts and downshifts based on transmission temperature, system voltage, throttle position, transmission oil pressure switches, and transmission output and input (engine) speed sensors. See Figure. System includes several other sensors and switches that are used for engine control (gasoline engines). For additional information and testing of engine components, see appropriate SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section.