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 Transmission Scan Tool Data List contains all Transmission related parameters that are available on the scan tool. The list is arranged in alphabetical order.
Use the Transmission Scan Tool Data List only after performing the following inspections:
- Powertrain On-Board Diagnostic System Check is completed.
- No Diagnostic Trouble Codes (DTCs) are present.
- On-board diagnostics are functioning properly.
Scan tool values from a properly running Transmission may be used for comparison with the Transmission you are diagnosing. The Transmission Scan Tool Data List represents values that would be seen on a normal running engine.
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Engine Idling/Upper Radiator Hose Hot/Closed Throttle/Transmission in Park or Neutral/Closed Loop | |||
| A/C Relay Command | Transmission Data | On/Off | Off |
| A/C Request Signal | Transmission Data | Yes/No | No |
| Diagnostic Mode | Transmission Data | Normal/Check | Normal |
| Engine Load | Transmission Data | % | 19.7% to 49.3% |
| ECT Sensor | Transmission Data | C°/F° | 80-90°C / 176-194°F |
| Engine Speed | Transmission Data | RPM | 650 to 750 RPM |
| High Electrical Load | Transmission Data | Yes/No | No |
| IAT Sensor | Transmission Data | C°/F° | Varies with the underhood and ambient temperature |
| Loop Status | Transmission Data | Open/Closed | Closed Loop |
| MAF Sensor | Transmission Data | g/s | - |
| MIL Command | Transmission Data | Yes/No | No |
| Overdrive Switch | Transmission Data | On/Off | On/Off |
| PNP (A/T only) | Transmission Data | P-N/R-D-L | P-N |
| Shift Request | Transmission Data | 1st | 1st |
| Starter Switch | Transmission Data | Released/Cranking | Released |
| TCC Brake Pedal Switch | Transmission Data | Released/Applied | Released |
| TCC Enable Solenoid Command | Transmission Data | On/Off | Off |
| TP Sensor | Transmission Data | % | 8-11% |
| Vehicle Speed Sensor | Transmission Data | km/h/MPH | 0 km/h |
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.