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 |
|---|---|---|---|
Body Control Module (BCM) Scan Tool Data List 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 |
Engine Control Module (ECM) Scan Tool Data List Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F) | |||
A/C Disengage 1 History | General Info-Inputs/Outputs | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch Perf., Coolant Hot | Varies |
A/C Disengage 2 History | General Info-Inputs/Outputs | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch Perf., Coolant Hot | Varies |
A/C Disengage 3 History | General Info-Inputs/Outputs | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch Perf., Coolant Hot | Varies |
A/C Disengage 4 History | General Info-Inputs/Outputs | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch Perf., Coolant Hot | Varies |
A/C Disengage 5 History | General Info-Inputs/Outputs | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch Perf., Coolant Hot | Varies |
A/C Disengage 6 History | General Info-Inputs/Outputs | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch Perf., Coolant Hot | Varies |
A/C Disengage 7 History | General Info-Inputs/Outputs | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch Perf., Coolant Hot | Varies |
A/C Disengage 8 History | General Info-Inputs/Outputs | None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch Perf., Coolant Hot | Varies |
A/C High Side Pressure Sensor | General Info-Inputs/Outputs | Volts | Varies |
A/C Off for WOT | General Info-Inputs/Outputs | Yes/No | No |
A/C Pressure Disable | General Info-Inputs/Outputs | Yes/No | No |
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 |
5 Volt Reference 2 Circuit Status | HVAC Data | OK / Fault | OK |
5 Volt Reference 1Circuit Status | HVAC Data | OK / Fault | OK |
Start Up IAT | HVAC Data | C/F | Varies |
