The Engine Scan Tool Data List contains all engine related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists, and in some cases may appear more than once, or in more than one data list in order to group certain related parameters together.
Use the Engine Scan Tool Data List only after the following is determined:
| • | The Diagnostic System Check-Engine Controls is completed. |
| • | No diagnostic trouble codes (DTCs). |
| • | On-board diagnostics are functioning properly. |
Scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Engine Scan Tool Data List represents values that would be seen on a normally running engine.
Important: A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this service manual for use in diagnosis. If all values are within the typical range described below, refer to Symptoms - HVAC Systems - Manual for diagnosis.
The column labeled Data List indicates where a parameter can be located on the scan tool. Refer to the scan tool operating manual for the exact locations of the data lists. The following is a description of each term listed:
ALL: The Parameter is in all data lists indicated below.ENG 1: Engine Data 1 List
ENG 2: Engine Data 2 List
ENG 3: Engine Data 3 List
EE: Enhanced Emission (EVAP) Data
FT : Fuel Trim Data List
MF: Misfire Data List
HO2S: HO2S Data List
BCM-NM: Body Control Module Normal Mode List
BCM-I/O: Body Control Module Input/Output List
BCM-SI: Body Control Module Status Information List
Scan Tool Parameter | Data List | Parameter Range/Units | Typical Data Values |
|---|---|---|---|
Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories Off | |||
A/C Clutch Feedback Signal | ENG 2 | On/Off | Off |
A/C Fan Request | BCM-I/O | Yes/No | Off |
A/C High Side Pressure | ENG 2 | 0-5 volts | Varies |
A/C High Side Pressure | ENG 2 | kPa/psi | Varies |
A/C LED | BCM-I/O | On/Off | Off |
A/C Relay Command | ENG 1, 2, 3, MF | On/Off | Off |
A/C Request Signal | ENG 2 | Yes/No | No |
A/C Request Switch | BCM-NM, BCM-I/O | On/Off | Off |
ECT Sensor | ALL | -39° to +140°C (-38° to +284°F) | 85-113°C (185-235°F) |
Fan Control | BCM-SI | On/Off | Depends on engine coolant temperature and A/C pressure |
Fan Requested | BCM-SI | Yes/No | Depends on engine coolant temperature and A/C pressure |
Fan Run On | BCM-SI | Inactive/Active | Depends on engine coolant temperature and A/C pressure |
Fan Run On | BCM-SI | Seconds | 0 |
FC Relay 1 Command | ENG 2, 3 | On/Off | Depends on engine coolant temperature and A/C pressure |
FC Relay 2 Command | ENG 2, 3 | On/Off | Depends on engine coolant temperature and A/C pressure |
Low Speed Fan Relay | BCM-NM, BCM-I/O | On/Off | Depends on engine coolant temperature and A/C pressure |
