The Engine Cooling Scan Tool Data List contains all engine cooling 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 Cooling Scan Tool Data List only after the following is determined:
| • | The Diagnostic System Check - Vehicle is completed. |
| • | No diagnostic trouble codes (DTCs) |
| • | On-board diagnostics are functioning properly. |
Scan tool values from a properly functioning engine cooling system may be used for comparison with the system you are diagnosing. The Engine Cooling Scan Tool Data List represents values that would be seen on a normal system.
Important: A scan tool that displays faulty data should not be used. The scan tool problem 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 - Engine Cooling 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 of the data lists indicated below.Cooling/HVAC: Cooling/HVAC Data List
Eng: Engine Data List
EE: Enhanced Evaporative Emission (EVAP) Data
FT: Fuel Trim Data List
H2: Heated Oxygen Sensor (HO2S) Data List
IG: Ignition System Data List
MF: Misfire Data List
OD: Output Driver Data List
TAC: Throttle Actuator Control (TAC) Data 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 High Side Pressure | Cooling/HVAC | 0-5 Volts | Varies |
A/C High Side Pressure | Cooling/HVAC | kPa/psi | Varies |
A/C High Side Pressure Switch | Cooling/HVAC | Normal/Open | Normal |
A/C Relay Circuit Status | Cooling/HVAC, OD | OK, Incomplete, Short B+, Short Gnd/Open | OK |
A/C Relay Command | Cooling/HVAC, ENG, MF, TAC | On/Off | Off |
Cooling Fan Command | Cooling/HVAC | 0/100% | 0% |
Cooling Fan Motor Command | Cooling/HVAC | 0/100% | 0% |
ECT Sensor | All | -39 to +140°C (-38 to +284°F) | 88-105°C (190-221°F) |
Engine Load | All | 0-100% | 20-25% |
Engine Oil Temperature | Cooling/HVAC, IPC | Degrees | Varies |
Engine Speed | All | 0-10,000 RPM | 500-700 RPM |
FC Circuit Status | Cooling/HVAC, OD | OK, Incomplete, Short B+, Short Gnd/Open | OK |
FC Relay 1 Command | Cooling/HVAC | Off/On | Depends on engine coolant temperature and A/C pressure |
FC Relay 2 Command | Cooling/HVAC | Off/On | Depends on engine coolant temperature and A/C pressure |
FC Relay 2 and 3 Command | Cooling/HVAC | Off/On | Depends on engine coolant temperature and A/C pressure |
5-Volt Reference 1 | Cooling/HVAC, Eng, EE, IG, TAC | Volts | 4.5 Volts |
5-Volt Reference 2 | Cooling/HVAC, Eng, EE, IG, TAC | Volts | 4.5 Volts |
IAT Sensor | All | -39 to +140°C (-38 to +284°F) | 35°C (91°F) Depends on ambient temperature |
Ignition 1 Signal | All | 0-25 Volts | 11.5-14.5 Volts |
Spark | Cooling/HVAC, Eng, EE, FT, H2, IG, MF | Degrees | 15-20 Degrees |
Start Up ECT | EE, FT, H2 | F°/C° | Varies |
Total Knock Retard | Cooling/HVAC, IG | Degrees | 0 Degrees |
Transmission Fluid Temperature | Cooling/HVAC | Degrees | Varies |
