Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN K1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1748 (AUTOMATIC TRANSMISSION - ALLISON - SPECIFICATIONS)SPECIFICATIONSPRESSURE SWITCH MANIFOLD (PSM) LOGIC
2006 Chevrolet Suburban K1500, 5.3 Z
Pressure Switch Manifold (PSM) Logic
2006 Chevrolet Suburban K1500, 5.3 ZSECTION Pressure Switch Manifold (PSM) Logic
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 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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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.