Use the Scan Tool Data Display Values and Definitions Information in order to assist in diagnosing the HVAC control assembly problems. Compare the vehicles actual scan tool data with the typical data display value table information. Use the data information in order to aid in understanding the nature of the problem when the vehicle does not match with the typical data display values.
The scan tool data values were taken from a known good vehicle under the following conditions:
| • | The ignition switch is in the ON position. |
| • | The engine is running at idle. |
| • | The vehicle is in PARK. |
| • | The doors are closed. |
| • | The windows are closed. |
| • | The A/C is ON. |
| • | The ambient air temperatures are at 22-27°C (70-80°F). |
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 | HVAC Data | On/Off | On |
Battery 1 | HVAC Data | Volts | Battery Voltage |
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 High Side Pressure | General Info-Inputs | kPa/psi | Varies |
A/C High Side Pressure | General Info-Inputs | 0 to 5 Volts | Varies |
A/C Pressure Disable | Cooling-HVAC Data | Yes/No | Varies |
A/C Off for WOT | Cooling-HVAC Data | Yes/No | Varies |
A/C Relay Command | General Info-Inputs/Outputs | On/Off | On |
A/C Request | General Info-Inputs/Outputs | Yes/No | Yes |
ECT | All | C/F | Varies |
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 High Side Pressure | Cooling/HVAC Data | kPa/psi | Varies |
A/C Off For WOT | Cooling/HVAC Data | Yes/No | Varies |
A/C Pressure Disable | Cooling/HVAC Data | Yes/No | Varies |
A/C Relay Circuit Status | Cooling/HVAC Data | OK/Fault | OK |
A/C Relay Command | Cooling/HVAC Data | On/Off | On |
A/C Request Signal | Cooling/HVAC Data | Yes/No | Yes |
ECT | All | C/F | Varies |
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 Auto Recirculation | Cooling/HVAC Data | On/Off | Varies |
A/C Compressor Cycling Switch | Cooling/HVAC Data | Low/Normal | Normal |
A/C High Side Pressure Switch | Cooling/HVAC Data | High/Normal | Normal |
A/C Disengage Reason | Cooling/HVAC Data | None, System Voltage, WOT, CKP Learn Active, Engine Run Time, Coolant Hot, Anti Stall, A/C Pressure, Engine Speed, Trans Engine Spd, A/C Press Sensor, Low Voltage, High Voltage, Outside Air Temp, A/C Switched Off | Varies |
A/C Disengage 1 History | Cooling/HVAC Data | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch | Varies |
A/C Disengage 2 History | Cooling/HVAC Data | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch | Varies |
A/C Disengage 3 History | Cooling/HVAC Data | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch | Varies |
A/C Disengage 4 History | Cooling/HVAC Data | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch | Varies |
A/C High Side Pressure | Cooling/HVAC Data | kPa/psi | Varies |
A/C Off For WOT | Cooling/HVAC Data | Yes/No | Varies |
A/C Pressure Disable | Cooling/HVAC Data | Yes/No | Varies |
A/C Relay Circuit Status | Cooling/HVAC Data | OK/Fault | OK |
A/C Relay Command | Cooling/HVAC Data | On/Off | On |
A/C Request Signal | Cooling/HVAC Data | Yes/No | Yes |
ECT Sensor | All | C/F | Varies |
Ignition 1 Signal | Cooling/HVAC Data | Volts | Varies |
