| Table 1: | PCM Scan Tool Data List 8.1L (L18) |
| Table 2: | PCM Scan Tool Data List 6.6L (LB7) |
| Table 3: | PCM Scan Tool Data List 7.8L (LG4) |
Use the Scan Tool Data Display Values and Definitions Information in order to assist in diagnosing the Powertrain Control Module (PCM) concerns. 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 concern 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 Clutch Feedback Signal | Engine Data 2 | Relay On/Relay Off | Relay On |
A/C Compressor Cycling Switch | Engine Data 2 | Low Pressure/Normal | Normal |
A/C Relay Command | EGR Data Engine Data 1 Engine Data 2 Misfire Data | On/Off | On |
A/C Request Signal | Engine Data 2 | Yes/No | Yes |
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 Clutch Feedback Signal | Engine Data 1 | Relay On/Relay Off | Varies |
A/C Compressor Cycling Switch | Engine Data 1 | Normal/Low Pressure | Normal |
A/C Relay Command | Engine Data 1 | On/Off | On |
A/C Request Signal | Engine Data 1 | Yes/No | Yes |
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 Request Signal | Engine Data 1 | Yes/No | Yes |
