Pressure Switch Manifold (PSM) Logic. GMC Truck GMC C Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2005 🢒 GMC C Sierra - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Pressure Switch Manifold (PSM) Logic

Range	Pressure Switch C - N/O		Pressure Switch D - N/O		Pressure Switch E - N/O		Pressure Switch R - N/C
Range	Switch Status	Scan Tool Status	Switch Status	Scan Tool Status	Switch Status	Scan Tool Status	Switch Status	Scan Tool Status
R	Open	OFF*	Closed	ON	Closed	ON	Closed	ON
N	Closed	ON	Closed	ON	Closed	ON	Open	OFF
1	Open	OFF	Closed	ON	Open	OFF	Open	OFF
2	Open	OFF	Open	OFF	Open	OFF	Open	OFF
3	Closed	ON	Open	OFF	Open	OFF	Open	OFF
4	Closed	ON	Open	OFF	Closed	ON	Open	OFF
5	Open	OFF**	Open	OFF	Closed	ON	Open	OFF
N/C = Normally Closed N/O = Normally Open * C pressure switch reverts to the Closed/ON state with throttle applied in Reverse. ** MY 2001 only; in 5th range, C pressure switch remains in the Closed/ON state until 3,900 RPM is attained.