Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool Data List
The 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 more than once, or in more than one data list in order to group certain related parameters together.
Use the 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 cooling system may be used for comparison with the system you are diagnosing. The Scan Tool Data List represents values that would be seen on a normal cooling system.
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:
| Scan Tool Parameter | Parameter Range/Units | Typical Data Values |
|---|---|---|
| Engine Idling/Radiator Hose Hot/Closed Throttle/Park/Closed Loop/Accessories OFF | ||
| 5-Volt Reference 1 Circuit Status | OK/Fault | OK |
| 5-Volt Reference 2 Circuit Status | OK/Fault | OK |
| 5-Volt Reference 1 | Volts | 4.5 V |
| 5-Volt Reference 2 | Volts | 4.5 V |
| Cooling Fan Command | ON/OFF | OFF |
| Desired Fan Speed | RPM | 0 |
| ECT Sensor | -39 to +140°C (-38 to +284°F) | 88-105°C (190-221°F) |
| Engine Load | 0-100% | 18% @ Idle 21% @ 2500 RPM |
| Engine Oil Temperature Calculated | Degrees C/F | 85-105°C (185-220°F) |
| Engine Run Time | Hrs, Min, Sec | Varies |
| Engine Speed | 0-10,000 RPM | 500-700 RPM |
| Fan Speed | RPM | 0 |
| FC Circuit Status | OK, Incomplete, Short B+, Short Gnd/Open | OK/Incomplete |
| Fan Relay 1 Command | ON/OFF | OFF |
| Fan Relay 2 Command | ON/OFF | OFF |
| Fan Relay 2 and 3 Command | ON/OFF | OFF |
| Fan Relay 3 Command | ON/OFF | OFF |
| Hot Open Loop | Active/Inactive | Inactive |
| IAT Sensor | -39 to +140°C (-38 to +284°F) | 35°C (91°F) Depends on Ambient Temperature |
| Ignition 1 Signal | 0-25 Volts | 11.5-14.5 Volts |
| Spark | Degrees | 10-17° |
| Start-Up ECT | °C/°F | Varies |
| Start-Up IAT | °C/°F | Varies |
| Total Knock Retard | Degrees | 0° |
| TFT Sensor | °C/°F | Varies |
| Vehicle Speed Sensor | km/h mph |
0 |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.