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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 21 (HVAC SYSTEM - MANUAL)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LIST
2009 Chevrolet Tahoe Base, 4.8 C
Scan Tool Data List
2009 Chevrolet Tahoe Base, 4.8 CSECTION Scan Tool Data List
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
HVAC Control Module Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F) | |||
| A/C Switch | Input/Output | On, Off | Off |
| Mode Door Actual | Door Positions | Counts | Varies |
| Mode Door Commanded | Door Positions | Counts | Varies |
| Mode Motor Drive | Door Positions | Stop, Increase, Decrease | Stop |
| Air Inlet Motor Drive | Door Positions | Fresh Air, Recirc. | Varies |
| Air Mix Door Left Commanded | Door Positions | Counts | Varies |
| Air Mix Door Right Commanded | Door Positions | Counts | Varies |
| Battery Voltage | Input/Output | Volts | 13.5-14.5 V |
| Blower Motor Status | Input/Output | Active, Inactive | Active |
| Ign. Since Current DTC | Input/Output | Numeric | 0 |
| Left Mix Door Actual | Door Positions | Counts | Varies |
| Left Mix Motor Drive | Door Positions | Stop, Increase, Decrease | Stop |
| Left Temp. Detent Pos. | Input/Output | 0-18 | Varies |
| Mode Select Position | Door Positions | Off, Auto, Defrost, Heater, Htr/Def, Bi-level, Panel | Varies |
| Pressure Cycle Switch | Input/Output | Low Pressure, Normal | Varies |
| Recirculate Switch | Input/Output | On, Off | Off |
| Right Mix Door Actual | Door Positions | Counts | Varies |
| Right Mix Motor Drive | Door Positions | Stop, Increase, Decrease | Stop |
| Right Temp Detent Pos. | Input/Output | 0-18 | Varies |
PCM Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F) | |||
| A/C Pressure Sensor | Engine Data 2 | kPa, Psi | 629-845 kPa (85-120 psi) |
| A/C Pressure Sensor | Engine Data 2 | Volts | Varies |
| A/C Relay Command | Engine Data 2 | On, Off | Varies |
| A/C Request Signal | Engine Data 2 | Yes, No | Varies |
| ECT Sensor | Engine Data 2 | °C/°F | 92°C (197°F) |
| ECT Sensor | Engine Data 2 | Volts | 1.10-1.45 Volts |
RENDER: 1.0x
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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.