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Pressure Switch Manifold (PSM) Logic

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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
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.
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