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 MANUALSCHEVROLET2001EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONS
2001 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Scan Tool Data Definitions
2001 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Scan Tool Data Definitions
The HVAC Scan Tool Data Definitions contains a brief description of all HVAC related parameters available on the scan tool. The list is in alphabetical order. A given parameter may appear in any one of the data lists. In some cases, the parameter may appear more than once or in more than one data list in order to group certain related parameters together.
PCM - A/C Relay Command: The scan tool displays On or Off. This parameter displays the PCM commanded state of the A/C compressor clutch relay. When the scan tool displays ON, the A/C compressor clutch should be engaged.
PCM - Engine Data 2 - A/C Compressor Cycling Switch: The scan tool displays Open or Closed. This parameter displays the state of the A/C compressor cycling switch. The A/C compressor cycling switch is a normally closed switch.
PCM - Engine Data 2 - A/C Sec. High Press. Switch: The scan tool displays Open or Closed. This parameter displays the state of the A/C secondary high pressure switch. The A/C secondary high pressure switch is normally open.
PCM - Engine Data 2 - A/C Request: The scan tool displays Yes or No. The A/C Request displays the state of the A/C request input circuit from the heating, ventilation, and air conditioning (HVAC) controls. The Powertrain Control Module (PCM) uses the A/C request signal in order to determine whether the A/C compressor operation is being requested.
PCM - A/C Relay Command: The scan tool displays On or Off. This parameter displays the PCM commanded state of the A/C compressor clutch relay. When the scan tool displays ON, the A/C compressor clutch should be engaged.
PCM - Engine Data 2 - A/C Compressor Cycling Switch: The scan tool displays Open or Closed. This parameter displays the state of the A/C compressor cycling switch. The A/C compressor cycling switch is a normally closed switch.
PCM - Engine Data 2 - A/C Sec. High Press. Switch: The scan tool displays Open or Closed. This parameter displays the state of the A/C secondary high pressure switch. The A/C secondary high pressure switch is normally open.
PCM - Engine Data 2 - A/C Request: The scan tool displays Yes or No. The A/C Request displays the state of the A/C request input circuit from the heating, ventilation, and air conditioning (HVAC) controls. The Powertrain Control Module (PCM) uses the A/C request signal in order to determine whether the A/C compressor operation is being requested.
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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.