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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Automatic Transmission - ALLISON - Introduction (2 Of 2)) >> Specifications >> Pressure Switch Manifold (PSM) Logic

Pressure Switch Manifold (PSM) Logic

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Pressure Switch Manifold (PSM) Logic

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 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
6 Open OFF Open OFF Closed ON Open OFF
N/C = Normally Closed
N/O = Normally Open
* Pressure switch 1 (PS1) reverts to the Closed/ON state with throttle applied in REVERSE.