Pressure Switch Manifold (PSM) Logic
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
| Range | Pressure Switch 1 - N/O | Pressure Switch 2 - N/O | Pressure Switch 3 - N/O | Pressure Switch 4 - N/C | ||||
|---|---|---|---|---|---|---|---|---|
| Switch Status | Scan Tool Status | Switch Status | Scan Tool Status | Switch Status | Scan Tool Status | Switch Status | Scan Tool Status | |
| R | Open | HIGH* | Closed | LOW | Closed | LOW | Closed | LOW |
| N | Closed | LOW | Closed | LOW | Closed | LOW | Open | HIGH |
| 1 | Open | HIGH | Closed | LOW | Open | HIGH | Open | HIGH |
| 2 | Open | HIGH | Open | HIGH | Open | HIGH | Open | HIGH |
| 3 | Closed | LOW | Open | HIGH | Open | HIGH | Open | HIGH |
| 4 | Closed | LOW | Open | HIGH | Closed | LOW | Open | HIGH |
| 5 | Open | HIGH | Open | HIGH | Closed | LOW | Open | HIGH |
| 6 | Open | HIGH | Open | HIGH | Closed | LOW | Open | HIGH |
| N/C = Normally Closed N/O = Normally Open * Pressure switch 1 (PS1) reverts to the Closed/LOW state with throttle applied in REVERSE. |
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