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

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C Sierra - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Pressure Switch Manifold (PSM) Logic

Pressure Switch Manifold (PSM) Logic Early Calibrations

Range	Pressure Switch C (N/O)		Pressure Switch D (N/O)		Pressure Switch E (N/O)		Pressure Switch R (N/C)
Range	Switch Status	Pressure Status	Switch Status	Pressure Status	Switch Status	Pressure Status	Switch Status	Pressure Status
R	Closed	ON	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	Closed*	ON	Open	OFF	Closed	ON	Open	OFF
N/C = Normally Closed N/O = Normally Open Pressure switch remains CLOSED until 3900 rpm output speed is reached and switch staus will change to OPEN and remain OPEN until output speed is reduced to 3700 rpm when the switch status will return to CLOSED. If early units are updated or were produced later in the 2001 MY, consult the similar table in the 2002 MY information.